MC Series Gas-Fired Circulating Heater INSTALLATION START-UP MAINTENANCE PARTS Models MC50 / MC80 MC99 / MC120 When installing models manufactured after July 7, 2008, you will notice additional selections on the control installer menu that will not apply to this unit. DO NOT CHANGE THESE FACTORY SETTINGS. Refer to the Control Program Reference Chart within this manual for selections that apply to this model. This manual must be used by a qualified installer/service technician.
IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT, CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE. DO NOT STORE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER HEATER. WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electrical switch. Do not use any phone in your building. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important product information. DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
The latest version of the National Electrical Code, NFPA No. 70. NOTE: The gas manifold and controls met safe lighting and other performance criteria when undergoing tests specified in ANSI Z21.10.3 – latest edition. The hydronic supply and return connections of these products are for installation in closed loop systems ONLY! Use of this product in any manner other than described in this manual may result in premature product failure, substantial property damage, severe personal injury, or death.
F. CIRCULATORS......................................................................................................................................................................... 17 G. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE HEATERS .................................................... 18 H. CIRCULATOR SIZING .............................................................................................................................................................. 18 I.
F. CHECK FOR GAS LEAKS ........................................................................................................................................................ 60 G. CHECK THERMOSTAT CIRCUIT(S) ....................................................................................................................................... 60 H. CONDENSATE REMOVAL ...........................................................................................................................................
DO NOT USE THIS HEATER IF ANY PART HAS BEEN SUBMERGED IN WATER. Immediately call a qualified service technician. The heater MUST BE replaced if it has been submerged. Attempting to operate a heater that has been submerged could create numerous harmful conditions, such as a potential gas leakage causing a fire and/or explosion, or the release of mold, bacteria, or other harmful particulates into the air.
Water pH between 6.0 and 8.0 o Maintain water pH between 6.0 and 8.0. Check with litmus paper or have it chemically analyzed by water treatment company. o If the pH differs from above, consult local water treatment company for treatment needed. Hardness less than 7 grains o Consult local water treatment companies for unusually hard water areas (above 7 grains hardness).
Modulating Combustion System Modulation during operation is based on supply temperature and desired temperature set point. The set point used for the control depends upon the programmed central heating curve. The heating curve slope can be changed by the installer to better fit system needs. The control monitors the system to regulate burner output during operation to match system demand. This increase in efficiency allows for substantial fuel savings.
C. OPTIONAL EQUIPMENT Below is a list of optional equipment available from HTP.
Failure to keep heater area clear and free of combustible materials, liquids, and vapors can result in substantial property damage, severe personal injury, or death. 4. Gas control system components must be protected from dripping water during operation and service. 5. If the heater is to replace an existing heater, check for and correct any existing system problems, such as: System leaks Location that could cause the system and heater to freeze and leak. Incorrectly-sized expansion tank 6.
C. CLEARANCES FOR SERVICE ACCESS See Figure 2 for recommended service clearances. If you do not provide the minimum clearances shown, it may not be possible to service the heater without removing it from the space. Figure 2 – Required Clearances Space must be provided with combustion/ventilation air openings correctly sized for all other appliances located in the same space as the heater. The heater cover must be securely fastened to prevent the heater from drawing air form the heater room.
E. EXHAUST VENT AND INTAKE PIPE Vents must be properly supported. Heater exhaust and intake connections are not designed to carry heavy weight. Vent support brackets must be within 1’ of the heater and the balance at 4’ intervals. Heater must be readily accessible for visual inspection for the first 3’ from the heater. The heater is rated ANSI Z21.13 Category IV (pressurized vent, likely to form condensate in the vent) and requires a special vent system designed for pressurized venting.
2. Visually inspect the venting system for proper size and horizontal pitch to determine if there is blockage, leakage, corrosion or other deficiencies that could cause an unsafe condition. 3. If practical, close all building doors, windows and all doors between the space in which the appliance remains connected to the common venting system located and other spaces in the building. Turn on clothes dryers and any appliances not connected to the common venting system.
The building frame (studs) must be 16" on center. If not, you must use 1/2" minimum plywood 24" x 48", fastened with at least (14) #12 x 3" (3/16" x 3") round head tapping screws to the frame of the building to provide proper support for the heater. Alternate methods of mounting must not be used. (ex. toggle bolts, hollow wall anchors) or any other fastener other than #12 x 3" (3/16" x 3") round head tapping screws.
5. New plumbing typically has contamination in the lines. Please flush the system before connection. The heater control module uses temperature sensors to provide both high limit protection and modulating temperature control. The control module also provides low water protection by sensing the water pressure. Some codes/jurisdictions may require additional external controls. B.
C. SEPARATE LOW WATER CUTOFF A low water cutoff may be required by state and local codes, or by some insurance companies. A low water cutoff is also required if the heater is installed above the piping level. Check code requirements before installing the heater. If required: Use an electrode probe type low water cutoff designed for hydronic installations. Install in a tee on the supply piping above the heater. Follow low water cutoff manufacturer’s instructions. D.
SIZING SPACE HEAT SYSTEM PIPING 1. See Piping Details in this section. In all diagrams, the space heating system is isolated from the heating loop by the primary/secondary connection. 2. Size the piping and components in the space heating system using recognized design methods. G. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE HEATERS This heater may function in a closed loop 15 psi system. An optional water pressure switch ensures adequate pressure in the system.
The chart below represents various system temperatures and their respective flows and friction loss through the heater, which will aid circulator selection. Figure 4 – Pressure Drop Graph and Temperature Rise Chart – LP-171-F NOTE: The recommended circulators are based on 1 gpm per 10,000 btu/hr with 20∆t. I. ZONING WITH ZONE VALVES 1. Connect heater to system as shown in 1A and 1B in Piping Details when zoning with zone valves.
L. FILL AND PURGE HEATING SYSTEM Attach the hose to balance and purge hose connector or drain valve and run hose to nearest drain. Close the other side of the balance and purge valve or the shut off valve after the drain. Open first zone balance and purge or drain valve to let water flow out the hose. If zone valves are used, open the valves one at a time manually. (NOTE: You should check valve manufacturer’s instruction prior to opening valves manually, so as not to damage the valve.
M. PIPING DETAILS Figure 5 LP-171 Rev. 4.10.
Figure 6 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 7 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 8 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 9 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 10 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 11 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
PART 6 – PIPING WITH OPTIONAL VISION 1 SYSTEM (DHW PRIORITY WITH OUTDOOR RESET) A. VISION 1 SYSTEM PIPING It is important that the system piping is done correctly when using the Vision 1 System. Follow the piping diagrams 2A through 3G when piping your heater. All general piping practices should still be maintained. B. ZONING WITH ZONE VALVES USING VISION 1 1. Connect the heater to the system as shown in piping details 2A through 2C. 2.
D. PIPING DETAILS WITH THE VISION 1 SYSTEM Figure 12 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5.
Figure 13 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 14 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 15 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 16 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 17 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 18 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 19 – NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”.
Figure 20 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
Figure 21 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum pipe size for connecting an indirect water heater is 1”. 5. The minimum pipe size for connecting the unit is 1.25”. 6.
PART 7 – VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL The heater must be vented as detailed in this Venting Section. Ensure exhaust vent and intake piping complies with these instructions regarding vent system. Inspect finished exhaust vent and intake piping thoroughly to ensure all joints are well secured, airtight, and comply with all applicable code requirements, as well as with the instructions provided in this manual.
The exhaust and intake components installed with this heater must be used for near heater piping BEFORE transitioning to the approved materials listed above. DO NOT REMOVE these installed components. Doing so WILL VOID appliance warranty. PVC/CPVC pipe and fittings of the same diameter are considered interchangeable. Do NOT use Foam Core Pipe in any portion of the exhaust piping from this heater. DO NOT connect PVC/CPVC to PP without an approved vent connector.
D. EXHAUST VENT AND INTAKE PIPE LOCATION Figure 22 – ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1 for Canada – Exit Terminals for Direct-Vent Venting Systems DETERMINE EXHAUST VENT AND INTAKE PIPE LOCATION – FIGURE 22 NOTES: A. Provide a minimum of 1 foot clearance from the bottom of the exhaust vent and intake pipe above the expected snow accumulation level. Snow removal may be necessary to maintain clearance. B.
The building owner is responsible for keeping the exhaust and intake terminations free of snow, ice, or other potential blockages, as well as scheduling routine maintenance. Failure to keep the vent piping terminations clear and properly maintain the heater could result in property damage, severe personal injury, or death. For each floor containing bedroom(s), a carbon monoxide detector and alarm shall be placed in the living area outside the bedrooms, as well as in the room that houses the heater.
Figure 23 – LP-171-R NOTES: 1. Condensate line must be pitched at least 1/4" per foot to properly drain. If this cannot be done, or a very long length of condensate hose is used, you must increase the condensate line to a minimum of 1” ID and place a tee in the line after the condensate neutralizer to properly reduce vacuum lock in the drain line. 2. Plastic pipe should be the only material used for the condensate line.
Figure 24 – Piping Exhaust around Obstructions – Suggested Condensate Removal E. ROTATING THE FLUE ADAPTER The flue adapter on the top of the heater can be rotated 180 degrees to position the air inlet in the optimum location for most venting and air inlet needs. The flue adapter MUST be positioned before the exhaust vent is connected to the adapter. NOTE: Once the exhaust vent is glued to the flue adapter it can no longer be moved. NOTE: DO NOT glue optional polypropylene vent system.
2. Inspect the area where the white flue adapter mates to the black plastic heat exchanger. You will notice two red wires and a plastic hose connected to the flue adapter. These will limit the rotation range of the flue adapter. 3. Grasp the entire white PVC flue adapter and rotate it in the direction that will cause the least strain on the hose and red wires until the air inlet is in the desired orientation.
H. EXHAUST VENT AND INTAKE PIPE INSTALLATION 1. The 2” exhaust vent connection is located on the top, right side of the unit, and the intake is on the top left side. Use only solid PVC or CPVC pipe, AL29-4C Stainless Steel, or a Polypropylene vent system approved for use with Category IV appliances. FOAM CORE PIPING IS NOT APPROVED. All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space. 2.
I. DIAGRAMS FOR SIDEWALL VENTING Figure 25 – Venting LP-171 Rev. 4.10.
J. DIAGRAMS FOR VERTICAL VENTING Figure 26 – Venting PART 8 – GAS PIPING Failure to follow all precautions in this section could result in fire, explosion, severe injury or death! A. GAS CONNECTION Connect the gas supply to the system following state and local plumbing codes. Use the supplied ball valve at the inlet to the system. Make sure the gas supply line fits as shown in Figure 27. The gas supply shall have a maximum inlet pressure of less than 14" water column (350 mm), ½ pound pressure (3.
*NOTE: Installer must supply trap to meet local code requirements. It is very important that you are connected to the type of gas noted on the rating plate. “LP” for liquefied petroleum, propane gas, or “NAT” for natural or city gas. You must not do a gas conversion without an approved gas conversion kit. Prior to turning the gas on, all gas connections must be approved by the local gas supplier or utility, in addition to the governing authority. A gas conversion kit comes with the heater.
connection to the swirl plate and blower. B. GAS PIPING 1. Run the gas supply line in accordance with all applicable codes. 2. Locate and install manual shutoff valves in accordance with state and local requirements. 3. In Canada, the Manual Shutoff must be identified by the installing contractor. 4. It is important to support gas piping as the heater is not designed to structurally support a large amount of weight. 5. Purge all gas lines thoroughly to avoid start up issues with air in the lines. 6.
The gas piping must be sized for the proper flow and length of pipe to avoid pressure drop. The gas meter and regulator must be properly sized for the total gas load. If you experience a pressure drop greater than 1" w.c. (.87 kPa), the meter, regulator or gas line may be undersized or in need of service. You can attach a manometer to the incoming gas drip leg after removing the cap. The gas pressure must remain between 3.5" (.87 kPa) and 14" (3.
Strain on the gas valve and fittings may result in vibration, premature component failure and gas leakage, and result in fire, explosion, property damage, severe personal injury, or death. Adjustments to the throttle screw or offset may only be made by a qualified gas technician using a calibrated combustion analyzer capable of measuring CO2 and CO. Failure to follow this instruction could result in fire, explosion, property damage, severe personal injury, or death.
Figure 29 LP-171 Rev. 4.10.
Figure 30 – NOTE: A resistor is provided between Bus Lines A and B. DO NOT REMOVE THIS RESISTOR! DOING SO WILL EFFECT HEATER OPERATION AND VOID WARRANTY! LP-171 Rev. 4.10.
Figure 31 – MC Series Internal Connection Diagram PART 10 – FIELD WIRING – VISION 1 OPTION Outdoor Sensor Function The user can program the desired supply temperature based on the heat transmitter (baseboard, radiant floor, air handler) that will be used in the installation. Once the outdoor sensor (light green wires) is connected to the control board, the water temperature of the heater will adjust to run the heater more efficiently and provide greater comfort to the living space.
Connected in the heater junction box, the Outdoor Sensor allows the user to automatically change the temperature going to the central heating loop. Route wires from the heater terminal strip to your outdoor sensor. Place the sensor preferably to the north or northwest or to the side which will be affected by changing weather conditions outside. NOTE: Do not locate the sensor in the direct sunlight.
Connection Specification – Wire 18 AWG maximum. Length of wire run cannot exceed 100 feet. PART 11 – START-UP PREPARATION Thoroughly clean and flush any system that has used glycol before installing the heater. Provide the customer with a material safety data sheet (MSDS) on the fluid used. A. CHECK/CONTROL WATER CHEMISTRY Chemical imbalance of your water can cause severe damage to your heater and associated equipment, and may also affect efficiency.
B. FREEZE PROTECTION (WHEN USED) NEVER use automotive or standard glycol antifreeze, or ethylene glycol made for hydronic systems. System water, including additives, must be non-toxic, having a toxicity rating or Class of 1, as listed in Clinical Toxicology of Commercial Products. Use only freezeprevention fluids certified by fluid manufacturer as suitable for use with stainless steel heaters, verified in fluid manufacturer literature.
1. Take the 5/16" flexible clear tube (rated for maximum temperature of 120°F) provided with the heater and place it over the barbed nipple on the manual air vent as shown in Fig. 31. 2. Fasten the tie wrap (provided) securely around the tube fastened to the barbed nipple on the manual air vent to keep the plastic tube from separating from the barbed nipple while purging the system. 3. Turn the manual air vent to the open position as shown in Fig. 31. Air and water should drain freely from the system. 4.
Never open the manual air vent while the heater is hot. Allow heater to cool to room temperature to avoid scalding while purging. g. Close the quick-fill water valve and purge valve and remove the hose. Open all isolation valves. Watch that system pressure rises to correct cold-fill pressure. h. After the system has operated for a while, eliminate any residual air by using the manual air vents located throughout the system. i.
3. Fill condensate trap with water. 4. Verify electrical connections are correct and securely attached. Inspect exhaust vent and intake piping for signs of deterioration from corrosion, physical damage or sagging. PART 12 – START-UP PROCEDURE FOR YOUR OWN SAFETY READ BEFORE OPERATING 1. This heater does not have pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. 2. BEFORE OPERATING: smell all around the heater area for gas.
To adjust, press either {S1} (Decrease Value) or {S2} (Increase Value) Ranges 5°F to 30°F. Press {S3} again and you will see the Indirect Setting de and an alternative value of 119 (with Vision Systems option). To adjust, press either {S1} (Decrease Value) or {S2} (Increase Value). The final adjustment in this mode is the Fahrenheit to Celsius measurement. Press {S3} again and you will see t and alternating value of F. To change value, press {S1} or {S2} to choose the correct measurement. C.
water heater is satisfied, the Vision I system will switch back to the central heating circuit to continue to heat the living space at a temperature based on outside temperature. This gives you a higher comfort level and further increases heater efficiency. A. PROGRAMMING THE VISION I OPTION The Vision I option allows the installer to set the system limits and heat curve for the heater. These system limits should not be changed by the user.
18 1 Step Modulation – Regulates the burner output in 6 steps in one-minute intervals. This reduces short cycling. 1 = on, 0 = off Indirect heater set point (flow) o 19 180 o o Temperature default = 119 to 180 20 1 Not applicable o NOTE: The maximum water temperature leaving the heater is limited to 185 F. Table 11 - *Central Heating Curve Function Central heating demand is detected when the room thermostat closes.
PART 14 – TROUBLESHOOTING A. ERROR CODE An error code may occur in the installation of the heater. This condition may lead to a lock out condition of the controller, which will need to be manually reset through the {S4}. These temporary codes will help the CONTROL PROGRAM REFERENCE CHART installer correct the problem before going into a lock out condition, which will require a DEFAULT PROGRAMMED manual reset. FUNCTION SETTING SETTING 1 de No change allowed B. HEATER ERROR o 2 149 F No change allowed 1.
CODE DESCRIPTION FOU Outdoor sensor is open, shorted, or outdoor temperature is below -40oF E03 The system sensor is open or shorted E19 The line voltage frequency is out of range PRO Water Pressure Switch is Open Blocked Vent Pressure Switch open, Condensate Cup Full, Condensate Cup not present FLU 926 CONTROL BOARD ERROR CODES DURATION CORRECTIVE ACTION 1. Disconnect the outdoor sensor from the wiring and measure its resistance.
F09 No flame detected – The heater will make three attempts at ignition before the control goes into this lockout condition. *See spark electrode detail. F10 Loss of flame signal – The heater will relight 4 times before the control goes into this lockout condition. Will reset in 1 hour. F11F F13 PP F31 False flame signal – The heater will lock out if it senses a flame signal when there should be none present.
heater. Installer must also inform the owner that the lack of proper care and maintenance of the heater may result in a hazardous condition. The installer should discuss the contents of the User's Information Manual with the owner. BEFORE EACH HEATING SEASON a trained and qualified service technician should perform the inspections and maintenance procedures as identified in this manual.
2. Using a spray bottle filled with calcium and lime deposit remover, spray liberally on the coils, making sure the solution penetrates and funnels down through the condensate hose. If the condensate hose is blocked, let the chemical penetrate for at least 15 minutes or until it drains. 3. Use the nylon, stainless or brass brush (do not use steel) and scrub coils to remove any buildup. Then vacuum the debris from the coils. WARNING: Follow above precautions. 4.
o o Visually inspect the primary pressure relief valve and discharge pipe for signs of weeping or leakage. If the pressure relief valve often weeps, the expansion tank may not be operating properly. Immediately contact a qualified service technician to inspect the unit and system. Check the condensate drain system. o While the unit is running, check the discharge end of the condensate drain tubing.
Figure 33 LP-171 Rev. 4.10.
Figure 34 LP-171 Rev. 4.10.
Figure 35 LP-171 Rev. 4.10.
HEATER START-UP REPORT LIGHT OFF ACTIVITIES 1) Fill the Check all piping and gas connections, verify all heating system are tight Pressurize system (12-15 PSI) Add water to prime condensate cup What percentage of propylene glycol is installed in the system (0-50%) Verify near heater piping is properly supported 2) Check gas Leak test using locally approved methods pipe (consult jurisdictional code book) Check incoming gas pressure (3.5” to 14” W.C.) What is the “drop” on light off (No more than 1” W.C.
INSPECTION ACTIVITIES PIPING Near heater piping Vent Gas SYSTEM Visual Functional Temperatures Temperatures ELECTRICAL Connections Smoke and CO detector Circuit Breakers CHAMBER/BURNER Combustion Chamber Spark Electrode Flame Probe CONDENSATE Neutralizer Condensate hose GAS Pressure Pressure Drop Check gas pipe for leaks COMBUSTION CO/CO2 Levels SAFETIES ECO (Energy Cut Off) Water Pressure Switch Thermistors FINAL INSPECTION Check list Homeowner 1st YEAR DATE LAST COMPLETED 2nd YEAR 3rd YEAR 4th Y
LP-171 Rev. 4.10.
LP-171 Rev. 4.10.
MAINTENANCE NOTES LP-171 Rev. 4.10.
HTP CUSTOMER INSTALLATION RECORD FORM The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty claim. After reading the important notes at the bottom of the page, please also sign this document.
