⚠ CBX-CWX-I-S_100160893_2000001309_Rev T Installation & Service Manual Models: 497 - 2067 ⚠ WARNING: 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. -- This water heater MUST NOT be installed in any location where gasoline or flammable vapors are likely to be present. -- WHAT TO DO IF YOU SMELL GAS •Do not try to light any appliance. •Do not touch any electric switch; do not use any phone in your building.
Contents HAZARD DEFINITIONS................................................... 2 PLEASE READ BEFORE PROCEEDING ................... 3-4 SAFETY INFORMATION ................................................. 4 THE COPPER-FIN -- HOW IT WORKS ....................... 5-7 RATINGS........................................................................ 8-9 1. DETERMINE UNIT LOCATION Locating the Unit .............................................................. 10 Indoor Clearances from Combustible Construction ....
Installation & Service Manual Please read before proceeding Special instructions NOTICE This is a gas appliance and should be installed by a licensed electrician and/or certified gas supplier. Service must be performed by a qualified service installer, service agency or the gas supplier. ⚠ WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death.
Installation & Service Manual Please read before proceeding Safety information ⚠ Owner warning – The information contained in this manual is intended for use by qualified professional installers, service technicians, or gas suppliers. ⚠ WARNING To minimize the possibility of serious personal injury, fire or damage to your unit, never violate the following safety rules. NOTICE 1. This unit is only for use with the type of gas indicated on the rating plate. ⚠ WARNING 2.
Installation & Service Manual The Copper-fin - How it works... 1. Heat exchanger The heat exchanger allows system water to flow through specially designed tubes for maximum heat transfer. The glass lined headers and copper fined tubing are encased in a jacket that contains the combustion process. 2. Inner combustion chamber door The inner combustion chamber door is a galvanized steel door which allows access for service, maintenance, and removal of the heat exchanger from inside the combustion chamber.
Installation & Service Manual The Copper-fin - How it works...
Installation & Service Manual The Copper-fin - How it works...
Installation & Service Manual Ratings Copper-fin AHRI Rating Model Number Input Note: Change “N” to “L” for L.P. gas models. MBH (Note 4) Other Specifications Gross Output MBH Net AHRI Ratings Water, MBH Vent Size Boiler Water Content Gallons Water Connections Gas Connections (Note 3) Min Max (Note 1) (Note 2) CBN497 250 495 401 349 1.9 2" 1 1/4" 6" CBN647 350 645 522 454 2.0 2" 1 1/4" 8" CBN747 350 745 603 524 2.4 2" 1 1/4" 8" CBN987 360 985 798 694 3.
Installation & Service Manual Ratings (continued) HLW LOW LEAD CONTENT Copper-fin Specifications Model Number Note: Change “N” to “L” for L.P. gas models Input MBH Water Content Gallons Water Connections Gas Connections Vent Size (Note 1) CWN497 495 1.9 2" 1 1/4" 6" CWN647 645 2.0 2" 1 1/4" 8" CWN747 745 2.4 2" 1 1/4" 8" CWN987 985 3.3 2 1/2" 2" 10" CWN1257 1255 3.5 2 1/2" 2" 12" CWN1437 1435 3.7 2 1/2" 2" 12" CWN1797 1795 4.
Installation & Service Manual 1 Determine unit location Installation This unit meets the safe lighting performance criteria with the gas manifold and control assembly provided, as specified in the ANSI standards for gas-fired units. ANSI Z21.13/CSA 4.9 and ANSI Z21.10.3/CSA 4.3. Locating the unit 1. Maintain all clearances from combustible construction when locating unit. See Clearances from Combustible Construction, this page. 2.
Installation & Service Manual 1 Determine unit location (continued) Outdoor boiler installation TABLE 1A COMBUSTIBLE FLOOR KITS Model Kit Number 497 100136977 Adequate hydronic system antifreeze must be used. A snow screen should be installed to prevent snow and ice accumulation around the unit or its venting system.
Installation & Service Manual 1 Determine unit location Freeze Protection for a Heating Boiler System (if required) Do not use undiluted or automotive type ⚠ WARNING anti-freeze. 1. Use only properly diluted inhibited glycol anti-freeze designed for hydronic systems. Inhibited propylene glycol is recommended for systems where incidental contact with drinking water is possible. 2. A solution of 50% antifreeze will provide maximum protection of approximately -30°F. 3.
Installation & Service Manual 1 Determine unit location Figure 1-3_Combustion air filter_ Models 497 - 747 (continued) Figure 1-4_Combustion air filter_ Models 987 - 2067 NOTICE During construction the air filter should be checked more frequently to ensure it does not become clogged with construction dirt and debris. CAUTION Sustained operation of an appliance with a clogged burner may result in nuisance operational problems, bad combustion, and non-warrantable component failures.
Installation & Service Manual 1 Determine unit location Combustion Air Options ⚠ CAUTION Under no circumstances should a mechanical room ever be under a negative pressure. Particular care should be taken when exhaust fans, clothes dryers, compressors, air handling units, etc., take away air from the inlet. This unit has four combustion air options. 1. Outside Combustion Air, No Ducts You can direct outside combustion air to this unit using either one or two permanent openings (see FIG. 1-5).
Installation & Service Manual 1 Determine unit location (continued) 3. Combustion Air from an Interior Space You can direct combustion air to this unit using air from an adjoining interior space. You must provide two openings from the boiler room to the adjoining room. Each of the two openings must have a net free area of one square inch per 1000 Btu input (22cm² per kW), but not less than 100 square inches (645cm²).
Installation & Service Manual 2 Venting General information You must supply adequate combustion and ventilation air to this unit. You must provide minimum clearances for the vent terminal from adjacent buildings, windows that open, and building openings. Follow all requirements set forth in the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment or applicable local building codes.
Installation & Service Manual 2 Venting (continued) Figure 2-4_Vent termination from flat roof - 10 ft. or more from parapet wall Figure 2-3_Vent termination from flat roof - 10 ft. or less from parapet wall Units which are shut down or will not operate may experience freezing due to convective air flow in flue pipe, through the air inlet, or from negative pressure in the equipment room. In cold climates, operate pump continuously to help prevent freezing of boiler water.
Installation & Service Manual 2 Venting Barometric damper location Any venting system option that requires a barometric damper must adhere to the following directions for optimum performance. The preferred location for the barometric damper is in a tee or collar installed in the vertical pipe rising from the unit’s flue outlet. The barometric damper MUST NOT be installed in a bull head tee installed on the unit’s flue outlet.
Installation & Service Manual 2 Venting (continued) Common venting systems may be too large when an existing unit is removed. At the time of removal of an existing appliance, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while other appliances remaining connected to the common venting system are not in operation. 1. Seal any unused opening in the common venting system. 2.
Installation & Service Manual 2 Venting Figure 2-7 Other than Direct Vent Terminal Clearances Table 2B Other than Direct Vent Terminal Clearances Canadian Installations¹ US Installations² A= Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm) B= Clearance to window or door that may be opened 6 in (15 cm) for appliances < 10,000 Btuh (3 kW), 12 in (30 cm) for appliances > 10,000 Btuh (3 kW) and < 100,000 Btuh (30 kW), 36 in (91 cm) for appliances > 100,000 Btuh (3
Installation & Service Manual 2 Venting (continued) Table 2B Other than Direct Vent Terminal Clearances (continued) * † ‡ J= Clearance to nonmechanical air supply inlet to building or the combustion air inlet to any other appliance K= Clearance to a mechanical air supply inlet L= Clearance above paved sidewalk or paved driveway located on public property M= Clearance under veranda, porch, deck, or balcony 6 in (15 cm) for appliances < 10,000 Btuh (3kW), 12 in (30 cm) for appliances > 10,000 Bt
Installation & Service Manual 2 Venting 2. Outdoor installation venting NOTICE Before installing a venting system, follow all venting clearances and requirements found in the Venting, General Information section, page 16. ⚠ WARNING Only install outdoor models outdoors and only use the vent systems supplied by the appliance manufacturer. Personal injury or product damage may result if any other cap is used or if an outdoor model is used indoors.
Installation & Service Manual 2 Venting (continued) 3' 3' 3' 3' 3' 3' 3' 3' 3' DIR #2000597290 00 DIR #2000597290 00 Figure 2-8_Outdoor vent kit installed on Models 497 - 747 Figure 2-9_Outdoor vent kit installed on Models 987 - 2067 Outdoor vent kit The optional outdoor vent kit is available from the appliance manufacturer. The outdoor kit part numbers are listed by unit size. See Table 2C for kit numbers. Complete installation instructions are included with the outdoor vent kit.
Installation & Service Manual 3 Gas connections Connecting to gas supply Gas piping Verify that the appliance is supplied with the type of gas specified on the rating plate. This appliance is configured for operation up to 2000 feet altitude. Consult factory for installations above 2000 feet elevation. To safely operate this unit, you must properly size the gas supply piping. See Tables 3B through 3D for piping and fitting requirements. Gas pipe size may be larger than heater connection.
Installation & Service Manual 3 Gas connections (continued) Gas connection All gas connections must be made with pipe joint compound resistant to the action of liquefied petroleum (L.P.) and natural gases. All piping must comply with local codes and ordinances. Piping installations must comply with approved standards and practices. 1. Make sure gas line is a separate line direct from the meter unless the existing gas line is of sufficient capacity. Verify pipe size with your gas supplier. 2.
Installation & Service Manual 3 Gas connections Combination gas valves Checking gas supply pressure These units fire in multiple stages of burner input. Each stage of burner operation has a combination gas valve(s) to cycle the gas supply on and off and regulate gas to the burners. Each combination valve consists of a gas regulator and two valve seats to meet the requirements for redundant gas valves.
Installation & Service Manual 3 Gas connections (continued) 10. If gas supply pressure is within normal range, remove the gas manometer and replace the pressure tap fittings in the gas control as indicated by the following steps. Gas manifold pressure adjustment NOTICE 11. Turn power switch to the “OFF” position. 12. Turn gas valve knob to the “OFF” position. 13. Shut off gas supply at the manual gas cock in the gas piping to the unit. If fuel supply is L.P. gas, shut off gas supply at the tank. 14.
Installation & Service Manual 3 Gas connections 12. If adjustment is necessary, remove the regulator cover screw on the gas valve. Note: If the gas valve under adjustment is located on a manifold assembly monitored by an igniter, the unit may shut down and recycle when the regulator cover screw is removed. This is normal. 13. Turn the regulator adjustment screw “clockwise” to raise the regulator gas pressure. Turn the regulator adjustment screw “counterclockwise” to lower the regulator gas pressure. 14.
Installation & Service Manual 4 Water connections Inlet and outlet connections Water flow switch For ease of service, install unions on the water inlet and water outlet of the unit. The connection to the unit marked “Inlet” on the header should be used for return from the system. The connection on the header marked “Outlet” is to be connected to the supply side of the system. A water flow switch is factory installed in the outlet piping on all heating boilers and water heaters.
Installation & Service Manual 4 Water connections Water connections (heating boilers only) Inlet and outlet water connections on Models 497 - 747 have 2'' NPT and on Models 987 - 2067 the inlet and outlet connections are 2 1/2'' NPT. Field installed reducing bushings must not be used to reduce below the pipe diameters of the models listed above.
Installation & Service Manual 4 Water connections (continued) Pump Maintenance: Inspect the pump every six (6) months and oil as necessary. Use SAE 30 non-detergent oil or lubricant specified by the pump manufacturer. The boiler is recommended for installation in a primary/ secondary piping system. This type of system uses a separate boiler circulating pump to supply flow to and from the boiler only.
Installation & Service Manual 4 Water connections Low temperature return water systems Start boiler adjustment with the bypass valve in the full open position and the boiler discharge valve half open. A small amount of the higher temperature boiler discharge water is mixed with the system water to maintain the desired lower system temperature. A remote low temperature range operator is recommended to control the boiler operation based on the lower system temperature.
Installation & Service Manual 4 Water connections (continued) Figure 4-5_Primary/secondary piping of single boiler COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.) 1 60 2 COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.
Installation & Service Manual 4 Water connections Figure 4-6_Primary/secondary piping of multiple boilers COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.) 2 180 4 COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.
Installation & Service Manual 4 Water connections (continued) Figure 4-7_Boiler with low temperature bypass COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.) 1 60 2 COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.
Installation & Service Manual 4 Water connections Figure 4-8_Primary/secondary piping with buffer tank COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.) 2 180 4 COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.
Installation & Service Manual 4 Water connections (continued) Installation with a chilled water system Pipe refrigeration systems in parallel. Install duct coil downstream at cooling coil.
Installation & Service Manual 4 Water connections Boiler bypass requirements The installer must ensure that the boiler is supplied with adequate flow without excessive temperature rise. It is recommended that this boiler be installed with a bypass in the piping if the maximum recommended flow rate is exceeded. The bypass will help to ensure that the boiler can be supplied with adequate water flow. Flow rates exceeding the maximum recommended flow will result in erosion of the boiler tubes.
Installation & Service Manual 5 Electrical connections Connecting to electrical supply This unit is wired for 120 VAC service. The unit, when installed, must be electrically grounded in accordance with the requirements of the authority having jurisdiction or in the absence of such requirements, with the latest edition of the National Electrical Code ANSI/NFPA No. 70. When the unit is installed in Canada, it must conform to the CAE C22.1, Canadian Electrical Code, Part 1 and/or local Electrical Codes. 1.
Installation & Service Manual 5 Electrical connections Line voltage connections 1. Connect 120 VAC power wiring to the line voltage terminal strip in the junction box, as shown in FIG. 5-2. 2. Provide and install a fused disconnect or service switch (15 AMP recommended) as required by the code (see FIG. 5-2). 3. To activate a system pump, wire as shown in FIG. 5-2. If the motor is larger than 1 HP, you must install a contactor.
Installation & Service Manual 5 Electrical connections (continued) Temperature control settings Figure 5-6_Remote on/off water heater Remote on/off 1 2 + 3 4 5 6 7 8 + + SYSTEM/TANK SENSOR + B2 INTERMITTENT B1 LIMITS A2 CONTINUOUS A1 LIMITS 1 NO ENABLE 1C + + + + 6 1 7 2 8 3 9 4 10 5 + 3 4 5 6 7 8 9 10 Stage 2 Stage 1 SYSTEM/TANK SENSOR + B2 INTERMITTENT B1 LIMITS A2 CONTINUOUS A1 LIMITS 2 NO HIGH FIRE 2 C ENABLE 1 NO LOW FIRE 1 C ENABLE + + + + + + + + The three setting kno
Installation & Service Manual 5 Electrical connections TABLE 5B Figure 5-11_Optional outdoor reset control Maximum Setpoint Determination OJ1 OJ2 Max. Setpoint Connected Connected 230° Cut Connected 190° Connected Cut 200° Cut Cut 160° NOTICE OUTDOOR AIR SHUTDOWN OUTDOOR AIR SENSOR SHUTDOWN Anytime that OJ1 is the only jumper cut, a new overlay is required under the Set Point knob on the temperature controller because the scale has changed to a maximum of 190°F.
Installation & Service Manual 5 Electrical connections (continued) Ratio The Ratio knob allows the control over the reset ratio to be used during Outdoor Air Reset. The allowable ratios are as low as 0.5:1 or as high as 1.5:1. Selecting the 0.5:1 ratio will increase the set point 0.5°F for every 1.0°F drop in outdoor air temperature up to the maximum set point temperature. Selecting the 1.5:1 ratio will increase the set point 1.5°F for every 1.
Installation & Service Manual 5 Electrical connections Outdoor air Temperature sensor The outside air temperature sensor will only be used for boiler systems. The outside air sensor is optional. You must purchase the sensor from the appliance manufacturer. The sensor comes with a housing that helps protect the sensor from the elements. Mount the air sensor housing under the eve of the roof. Make sure the housing is out of direct sunlight.
Installation & Service Manual 5 Electrical connections (continued) Hot surface ignition system Hot surface igniter and ignition control module This unit has one ignition module and one hot surface igniter. Figure 5-14_Hot surface igniter Diagnostic Status Indication The ignition module has an LED which indicates the status of the safety circuits. A remote Ignition Module Status indicating light is wired from the ignition module Status LED and mounted on the front diagnostic panel.
Installation & Service Manual 5 Electrical connections Operation and diagnostic lights TABLE 5E The diagnostic control panel has up to 6 indicating and diagnostic lights to show all major steps of operation and control sensed malfunctions. This panel is located on the front of the unit. Code Sequence Condition Lights TABLE 5D Prepurge Operation for combustion air fan before ignition on stages 1 and 2. Trial for Ignition Hot surface igniter preparing to light burners.
Installation & Service Manual 6 Startup Figure 6-1_Operating instructions FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. B. BEFORE OPERATING smell all around the appliance area for gas.
Installation & Service Manual 6 Startup Pre-Commissioning Cleaning 1. Prior to fill and start-up, flush the entire heating system. 2. Clean the entire heating system with an approved precommissioning cleaner (comparable to Sentinel X300 or Fernox F3) in accordance with the manufacturer’s recommendation to remove debris and prolong the life of the heat exchanger. Boiler water CAUTION DO NOT use "homemade cures" or "boiler patent medicines".
Installation & Service Manual 6 Startup (continued) 1. Use glycol only if needed for freeze protection. Fill and test water system 2. Propylene glycol is the recommended freeze protection. 3. Make sure to flush the boiler system before adding glycol. 1. Fill system only after ensuring the water meets the requirements of this manual. 4. Determine the freeze protection fluid quantity using system water content, following the fluid manufacturer's instructions.
Installation & Service Manual 6 Startup Check for gas leaks ⚠ WARNING Before starting the boiler, and during initial operation, smell near the floor and around the boiler for gas odorant or any unusual odor. Remove the front access panel and smell the interior of the boiler enclosure. Do not proceed with startup if there is any indication of a gas leak. Use an approved leak detection solution. Repair any leaks at once.
Installation & Service Manual 7 Domestic water heaters This section applies only to those units used to supply potable hot water for domestic use. The water heater must be installed with a storage tank. This section contains specific instructions for those units used to supply domestic hot water. All warnings, cautions, notes and instructions in the general installation and service sections apply to these instructions. Water heaters are designed for installation with a properly sized storage tank.
Installation & Service Manual 7 Domestic water heaters Figure 7-1_Typical water heater piping with storage tank COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.) 1 60 2 1/2 COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.
Installation & Service Manual 7 Domestic water heaters (continued) Figure 7-2_Single water heater piping with two storage tanks COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.) 1 60 2 1/2 BUILDING HOT WATER SUPPLY COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.
Installation & Service Manual 7 Domestic water heaters Figure 7-3_Multiple water heater piping with a single storage tank COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.) 2 180 4 COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.
Installation & Service Manual 7 Domestic water heaters (continued) Figure 7-4_Multiple water heater piping with multiple storage tanks COMMON MANIFOLD SIZE (Min.) Models: 987 - 2067 Diameter Number of Units GPM (in.) 2 180 4 COMMON MANIFOLD SIZE (Min.) Models: 497 - 747 Diameter Number of Units GPM (in.
Installation & Service Manual 7 Domestic water heaters Required temperature rise TABLE 7C Pipe Sizing Chart Based on heating potable water with a hardness of 5 to 20 grains per gallon and/or total dissolved solids not exceeding 350 ppm, see Water Chemistry, this page. Water chemistry 497 - 747 Number of Units Common Pipe Size (Min.
Installation & Service Manual 7 Domestic water heaters Minimum pump performance This is based on heating potable water with a hardness of 5 to 25 grains per gallon and/or total dissolved solids not exceeding 350 ppm. See Water Chemistry, page 56.
Installation & Service Manual 7 Domestic water heaters Storing the water at a higher temperature and thermostatically mixing the water increases the available quantity of mixed hot water, greatly reducing the possibility of condensate forming on the heat exchanger or in the venting system and helps prevent water born bacteria growth. NOTICE The High-Fire stage will be delayed by approximately 10 seconds to allow a soft start of the water heater.
Installation & Service Manual 7 Domestic water heaters (continued) High water temperature limit control The unit is equipped with an adjustable setting, auto-reset high water temperature limit control. The hot water heater temperature limit control has a maximum limit setting of 200°F (93°C). If water temperature exceeds the set point, the limit will break the control circuit and shut down the unit.
Installation & Service Manual 8 Maintenance Listed below are items that must be checked to ensure safe, reliable operations. Verify proper installation after servicing. Lifting Flames: The usual causes for lifting flames are over firing the burner(s), excessive primary air, or high draft. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
Installation & Service Manual 8 Maintenance (continued) Heat exchanger cleaning Combustion and ventilation air 1. Combustion air filter 2. While burners are removed, check the heat exchanger surface for sooting. If present, heat exchanger must be cleaned and problem corrected. Proceed as follows. Remove gas manifold(s)/orifice assemblies as described in steps 1 through 5 in Burner Removal and Cleaning, page 60. See Combustion Air Filter, page 13.
Installation & Service Manual 8 Maintenance Figure 8-2_Air pressure switch 4. Adjust the air shutter until the air chamber pressure is nominally 1.35 - 1.45 inches water column. See FIG. 8-4 for installations up to 2000 feet altitude. Contact the factory for high altitude settings. 5. Once the adjustment procedure is complete, reattach the cap to the tee in the hose and check all tubing and wire connections for a snug fit. Test fire the unit. Reinstall upper panels.
Installation & Service Manual 8 Maintenance (continued) Figure 8-5_Loosening the transition box screws, Models 1437, 1797 and 2067 only Ignition system checkout 1. Turn off gas supply to unit. 2. Turn electric power on. 3. Adjust the set point on the temperature control to a setting above water temperature or to the highest safe setting. 4. The igniter will cycle on trial for ignition. 5. The ignition module will lock out and turn the alarm light on. 6.
Installation & Service Manual 8 9. Maintenance 24VAC is supplied to the intermittent alarm field safety contacts, B1 and B2. 10. 24VAC is supplied to the water flow switch. 11. 24VAC is supplied to the TH terminals on the ignition module. 12. As power is applied to the TH terminals on the ignition module, 120VAC is switched from the F2 terminal to start the combustion air fan at full speed on Models 497 - 747 and at low speed on Models 987 - 2067. Heat transfer process 28.
Installation & Service Manual 8 Maintenance Maintenance and annual startup Table 8A_Service and Maintenance Schedules Owner maintenance Service technician (see the following pages for instructions) (see the Copper-fin User’s Information Manual for instructions) General: • Address reported problems • Inspect interior; clean and vacuum if necessary; • Check appliance area Daily • Check for leaks (water, gas, flue, condensate) • Check pressure/temperature gauge • Examine venting system ANNUAL STA
Installation & Service Manual 9 Glossary Power Supply (AC120VAC/60Hz) Safety Device Terminals The black line voltage wire runs directly to a single pole, single throw On/Off rocker switch located behind the front cover accessible by a thumb screw. Turning ON the rocker switch delivers line voltage to the low voltage transformer and ignition module.
Installation & Service Manual 9 Glossary Once the ignition module sees a 24VAC input from the pressure switch, it runs the blower in order to purge the combustion chamber of any unburned fuel/air mixture. Trial for Ignition (Ignition Module Function) Once the ignition module has completed its prepurge period, it turns on the hot surface igniter.
Installation & Service Manual 10 Diagrams Ladder diagram 68
Installation & Service Manual 10 Diagrams Ladder diagram (continued) (continued) 69
Installation & Service Manual 10 Diagrams Connection diagram 70
Installation & Service Manual 10 Diagrams (continued) Connection diagram (continued) 71
Revision Notes: Revision A (ECO #C07390) initial release. Revision B (ECO C09691) reflects the update of AHRI and ASME logos on pages 8 and 9. Revision C (ECO C12077) reflects the update of ignition timing information on pages 40, 43, 61 and 63 as well as the update of heat exchanger information on page54. Revision D (ECO C12972) reflects the addition of the CSA Low Lead Content logo. Revision E (ECO C13163) reflects the addition of the Line Voltage Connections section on page 38 per ECR R06420.
