CONDENSING TANKLESS GAS WATER HEATER Installation Manual Model : NCC199CDV (GQ-C3260WZ-FF US) WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • WHAT TO DO IF YOU SMELL GAS - Do not try to light any appliance.
Contents 1 Before Installation 3 8 Connecting the Water Supply 36 8.1 Installation........................................ 36 2 About the Water Heater 5 8.2 Water Treatment.............................. 38 2.1 Included Accessories........................ 5 2.2 Optional Accessories........................ 5 9 Connecting the Condensate Drain 40 2.3 Specifications.................................... 7 2.4 Dimensions....................................... 8 10 Connecting Electricity 42 2.
1 Before Installation Potential dangers from accidents during installation and use are divided into the following four categories. Closely observe these warnings, they are critical to your safety. 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.
CAUTION Do Not Use Appliance for Purposes Other Than Those Specified Do not use for other than increasing the temperature of the water supply, as unexpected accidents may occur as a result. Check Water Supply Quality If the water supply is in excess of 12 grains per gallon (200 mg/L) of hardness, acidic or otherwise impure, treat the water with approved methods in order to ensure full warranty coverage. NOTICE • This appliance is suitable for combination potable water and space heating applications.
2 About the Water Heater 2.1 Included Accessories 2.2 Optional Accessories The following accessories are included with the Water Heater. Check for any missing items before starting installation. The accessories listed below are not included with the Water Heater, but may be necessary for installation. Anchoring Screw (× 7) NOTE Additional vent pieces are available; consult the latest product catalogue for details.
Bird Screen for 2 in. (50 mm) PVC [VT2-PVCS] Noritz Connect Wireless Adapter NWC-ADAPTER (× 1) [NAW-1 US] Noritz Connect Wireless Adapter enables users to: • Remote control (Power ON/OFF, Adjust set temperature) Bird Screen for 3 in. (75 mm) PVC [VT3-PVCS] 3 in. (75 mm) Horizontal Hood Termination [PVT-HL] Universal Concentric Vent Kit [PVC-UCVK] Low Profile Termination Kit 2 in.: [PVC-2LPT] 3 in.
2.3 Specifications • Specifications may be changed without prior notice. • The capacity may differ slightly, depending on the water pressure, water supply, piping conditions, and water temperature. Item Specification NCC199CDV (GQ-C3260WZ-FF US) Installation Indoor / Outdoor Wall mounted Type Air Supply / Exhaust Power Vented Ignition Direct Ignition 15-150 psi Operating Pressure (Recommended 50 to 80 psi for maximum performance) Minimum Activation Flow Rate* 0.5 GPM (2.
2.4 Dimensions WALL MOUTING BRACKET (INCLUDED ACCESSORY) 16.0”[406] 10.2”[260] 0.3”[8] 4×Φ0.5”[Φ13] 4×0.24”×0.6”[6×15]OBLONG HOLE About the Water Heater 2.3”[59] 1.6”[40] 1.1”[27] 26.0”[661] 0.5”[12] 10.2”[260] 2.2”[56] 3.9”[100] 5.2”[132] 6.7”[169] 8.1”[206] 2×0.4”×0.24”[10×6]OBLONG HOLE 8 3.5”[89] 3×0.5”[12]×1.6”[40]RECTANGLE HOLE 27.4”[696] 2.0”[52] 7.2”[183] 2.1”[5.3] 27.1”[690] 2.3”[58] 5.1”[130] 14.1”[359] 25.9”[658] 7×Φ0.2”[Φ6] 0.
17.8”[452] 18.5”[471] 17.8”[451] 5.1”[130] 10.1”[256] I.DΦ2.4”[Φ61] I.DΦ2.4”[Φ61] FLUE COLLAR 27.0”[687] AIR INLET (VIEW FROM BOTTOM) COLD WATER INLET(3/4”) WIRING THROUGHWAY CONDENSATE DRAIN(1/2”) GAS INLET(3/4”) LED WIRING THROUGHWAY 1.7”[42] 5.7”[144] 7.0”[177] 9.2”[234] 2.2”[56] 6.0”[152] 4.9”[124] 2.0”[51] 11.3”[288] 9.7”[246] WATER DRAIN VALVE (WATER FILTER) WIRING THROUGHWAY (AC120V) WATER DRAIN VALVE HOT WATER OUTLET(3/4”) 15.4”[392] 15.
2.
3 Choosing an Installation Location DANGER Locate the vent terminal and make sure there are no obstacles around the termination for exhaust to accumulate or be obstructed. Do not enclose the termination with corrugated metal or other materials. Carbon monoxide poisoning or fire may occur as a result.
CAUTION Installation in the vicinity of gas ranges, stoves, fans, and range hoods • Avoid installation above gas ranges or stoves. • Avoid installation between the kitchen fan and stove. If oily fumes or a large amount of steam are present in the installation location, take measures to prevent the fumes and steam from entering in the appliance. NOT CORRECT • Install in a location where the exhaust gas flow will not be affected by fans or range hoods.
State of California: The Water Heater must be braced, anchored or strapped to avoid moving during an earthquake. Contact local utilities for code requirements in your area or call 1-866-766-7489 and request instructions. The Commonwealth of Massachusetts: 1) This Water Heater can only be used in outdoor applications if the usage is restricted to summertime usage exclusively. 2) The Water Heater can be used for hot water only and not in a combination of domestic and space heating.
Cooking Equipment Surrounding the area of installation When utilizing an indoor air supply, if the Water Heater will be installed in the vicinity of a permanent kitchen range or stove that has the possibility of generating steam that contains fats or oils, use a dividing plate or other measure to ensure that the Water Heater is not exposed to air containing such impurities.
5 Installation of the Water Heater 5.1 M ounting the Water Heater to the wall WARNING 2. Hang the Water Heater on the Wall Mounting Bracket. Moun ng Bracket (Upper) Do not drop or apply unnecessary force to the appliance when installing. Internal parts may be damaged and may become highly dangerous. Hang CAUTION • Protect your hands with gloves and take caution to not inflict injury. • Be careful not to hit electrical wiring, gas, or water piping while drilling holes.
5.2 Elevation Adjustment Above 2,000 ft • Adjust the DIP switches as illustrated in the table below, if this Water Heater is installed at an altitude of 2,000 ft (610 m) or higher. • Disconnect the electrical power and then adjust the DIP switches. Refer to page 49 for the location of the DIP switch bank and how to change the DIP switches. Failure to perform this step will result a “73” code displayed on the Remote Controller and a cease in operation.
6 Venting the Water Heater WARNING CARBON MONOXIDE POISONING Follow all vent system requirements in accordance with relevant local or state regulation, or, in the absence of local or state code, if in the U.S., refer to the National Fuel Gas Code ANSI Z223.1 / NFPA 54 - latest edition, and if in Canada, in accordance with the Natural Gas and Propane Installation Code CSA B149.1 latest edition. 6.1 Venting Installation Sequence 1. Install the Water Heater. 2.
• Use only solid PVC / CPVC (schedule 40) or PP pipe. • 2 in. or 3 in. schedule 80 pipe may also be used on this Water Heater, however the Btu/h input of the Water Heater will be reduced by up to 9%. • Maintain the same vent pipe diameter from the Water Heater flue to the termination. • In Canada, plastic vent systems must be certified to ULC S636. The components of the certified vent system must not be interchanged with other vent systems or unlisted pipe/fittings.
• A bird screen must be installed on the vent terminations to prevent debris or animals from entering the piping. These screens are not supplied with the Water Heater and must be purchased separately. Vent Material 2 in. (50 mm) PVC or CPVC 3 in. (75 mm) PVC or CPVC Centrotherm - 2 in. (50 mm) PP Centrotherm - 3 in. (75 mm) PP DuraVent - 2 in. (60 mm) PP DuraVent - 3 in. (80 mm) PP Bird Screen Parts # VT2-PVCS VT3-PVCS IASPP02 IASPP03 2PPS-BG 3PPS-BG • The following termination can also be used.
Step 3: Number of elbows 90° elbows: 2 45° elbows: 2 Step 4: Calculate equivalent length 90° elbows: 2 × 5 ft = 10 ft 45° elbows: 2 × 3 ft = 6 ft Step 5: Total vent length (Add Step 2 and Step 4 together) 17 ft + 16 ft = 33 ft Step 6: Check [DIP Switch Adjustment] and select DIP switch settings. ②[33 ft or more using 2 in. (50 mm) pipe] (i.e., turn ON DIP switch #7) 6.3 Select a Vent Type Outdoor (with Outdoor Vent Cap VC-6) The Water Heater can be installed outside using the Outdoor Vent Cap (VC-6).
6.4 Vent Pipe Installation (Direct Vent) 6.4.1 Clearance Requirements from Vent Terminations to Building Openings [When supplying combustion air from the outdoors] • All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code, ANSI Z223.1 and in Canada, in accordance with the Natural Gas and Propane Installation Code CSA B149.1.
6.4.2 Horizontal Vent Termination For Horizontal Vent Termination - PVC/CPVC Material Only • Use a condensation drain if necessary. • In the Commonwealth of Massachusetts a carbon monoxide detector is required for all side wall horizontally vented gas fuel equipment. Refer to Technical Bulletin TB 010606 for full installation instructions. Ceiling Hanger Straps Exhaust 3 in. (75 mm) or 2 in. (50 mm) 3 in. (75 mm) pipe and 2 in. × 3 in.
Alternate Horizontal Vent Termination- PVC, CPVC or PP Material (When 3 ft (0.9 m) distance between Intake and Exhaust cannot be ensured.) WARNING • If the distance between the air inlet and exhaust vent terminations is too short, the Water Heater will draw in the exhaust gases through the intake. There is a risk of inadequate combustion air for the Water Heater, thus increasing Carbon Monoxide (CO) emissions and noise due to vibration.
For Horizontal PVC Concentric Termination - PVC/CPVC Material Only • The concentric termination may be shortened, but not lengthened from its original factory supplied length. • 2 in. (50 mm) or 3 in. (75 mm) PVC or CPVC pipe may be used with the concentric termination. Maintain the same vent pipe diameter from the Water Heater flue to the termination. • Use a condensation drain if necessary.
6.4.3 Vertical Vent Termination For Vertical Vent Termination - PVC, CPVC or PP Material About the termination *• When choosing intake and exhaust terminations, you must use the same type of elbow (i.e. both 90° elbows). This will help with proper combustion by putting both terminations in the same pressure zone. • Insert Bird Screen in End of 90° Elbow. Bird Screen is not supplied with water heater, order separately.
For Vertical PVC Concentric Termination - PVC/CPVC Material Only • The concentric termination may be shortened, but not lengthened from its original factory supplied length. • 2 in. (50 mm) or 3 in. (75 mm) PVC or CPVC pipe may be used with the concentric termination. Maintain the same vent pipe diameter from the Water Heater flue to the termination. • Use a condensation drain if necessary.
6.5 Vent Pipe Installation (Non-Direct Vent) 6.5.1 Clearance Requirements from Vent Terminations to Building Openings [Other than Direct Vent] • All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code, ANSI Z223.1 and in Canada, in accordance with the Natural Gas and Propane Installation Code CSA B149.1.
6.5.2 Consideration for Installation DANGER • When installing this Water Heater in an area with a large amount of lint such as a commercial Laundromat, direct vent (“-DV”) system must be used. The “-SV” configuration (using SV conversion kit) is prohibited. • When installing this Water Heater in a mobile home, all combustion must be drawn directly from the outdoors. The “-SV” configuration (using SV conversion kit) is prohibited.
6.5.4 Horizontal Vent Termination • Use a condensation drain if necessary. • In the Commonwealth of Massachusetts a carbon monoxide detector is required for all side wall horizontally vented gas fuel equipment. Refer to Technical Bulletin TB 010606 for full installation instructions. Exhaust 2 in. (50 mm) or 3 in. (75 mm) Either a tee or the PVT-HL termination may be used for the vent termination. Hanger Straps Intake SV Conversion Kit Accessory (SV-CK-2) Inlet Screen Slope the horizontal vent 1/4 in.
6.5.5 Vertical Vent Termination About the termination *• Insert Bird Screen in End of 90° Elbow. Bird Screen is not supplied with water heater, order separately. • To prevent excessive condensation formation, only the vent termination should be located on the exterior of the building. ≥ 3 ft Min. Storm Collar Roof Flashing * • The combustion air intake of any appliance • Any other building opening 12 in.
6.6 Outdoor Installation • When installing this Water Heater outdoors, the “Outdoor Vent Cap (VC-6)” must be used. • Refer to the instructions provided with Outdoor Vent Cap for additional detail. • Disconnect the electrical power and then turn ON DIP switch #2 if outdoor installation. Refer to page 49 for the location of the DIP switch bank and how to change the DIP switch. Failure to perform this step will result a “73” code displayed on the Remote Controller and a cease in operation.
7 Connecting the Gas Supply Follow the instructions from the gas supplier. WARNING The sizing and installation of the gas system for this Water Heater, as with any gas appliance, is the sole responsibility of the installer. The installer must be professionally trained to do such work and must always follow all local and national codes and regulations. Gas Type The gas type indicated on the Water Heater’s rating plate (NG or LP) must match the type of gas being supplied to the Water Heater.
Pipe Sizing • A gas shut off valve must be installed on the supply line. • Gas piping shall be in accordance with local utility company requirements and/or in the absence of local codes, use the latest edition of National Fuel Gas Code (NFPA54GC), ANSI Z223.1. In Canada, use the latest edition of CSA B149.1, Natural Gas and Propane installation code.
4. • Enter the demand is the amount of gas flowing through a section of pipe in the table below. - For natural gas, use total Btu/h rating/1000 (ft3/h). - For propane, use total Btu/h. • For each section, determine the longest piping from the point of delivery to the furthest appliance through each section. Enter this length for all pipe sections in the table below. • Round up to the lengths in the appropriate table on page 35.
[Gas pipe sizing tables] • These tables are for reference only. Consult gas pipe manufacturer for actual pipe capacities. • It is an example of Schedule 40 Metallic Pipe. • (Only Table 1 - 4) Values in Table are in ft3 of Gas per Hour. Contact your gas supplier for Btu/ft3 ratings. For simplification of your calculations, 1 ft3 of Gas is approximately equivalent to 1,000 Btu. 1. Maximum Natural Gas Delivery Capacity (For Less than 6 in. W.C. initial supply pressure) 0.5 in. W.C.
8 Connecting the Water Supply • Installation and service must be performed by a qualified plumber. • In the Commonwealth of Massachusetts, this product must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248 CMR Sections 2.00 and 5.00. • Observe all applicable codes. 8.1 Installation 8.1.
Cold water supply • Be sure to check the water pressure. - In order for the client to use the Water Heater comfortably, 15 to 150 psi* (103.4 to 1034 kPa) of pressure is needed from the water supply. * Recommended 50 to 80 psi for maximum performance. - If the water pressure is low, the Water Heater cannot perform to its full capability, and may become a source of trouble for the client.
8.2 Water Treatment If this Water Heater will be installed in a location where the hardness of the supply water is high, scale Build-up may cause damage to the Heat Exchanger. Perform suggested treatment and maintenance measures to be taken based on the water hardness level according to the below table.
Flushing the Heat Exchanger • The Heat Exchanger regularly needs to be flushed to prevent damage from Scale Build-up. Refer to the “Procedure for flushing the Heat Exchanger” on page 66 or contact Noritz America for more information. (http://support.noritz.com/ or 1-866-766-7489) About the Service Reminder • This Water Heater is equipped with an automatic service reminder to announce for flushing the Heat Exchanger.
9 Connecting the Condensate Drain Condensing Water Heater • In order to ensure proper operation of this Water Heater, need to install the condensate drain pipe to drain acidic condensate which produces during operation. • The pH level of the condensate is approximately 2-3. An external neutralizer must be installed on the condensate drain piping prior to disposal when required by local code or when the condensate could cause damage.
After installing the condensate drain piping • Make sure that there are no obstructions blocking the condensate drain line from discharging condensate. • Be sure to check that condensate is freely flowing from the condensate drain piping. Condensate will begin flowing out of the Water Heater within 15 minutes after operation has started. Freeze prevention Take measures to prevent the condensate drain lines from freezing (insulation, heat tape, electric heaters, etc.).
10 Connecting Electricity Consult a qualified electrician for the electrical work. 10.1 W ater Heater This appliance must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/ NFPA 70. In Canada, the latest CSA C22.1 Electrical Code. WARNING Electrical Shock Hazard Do not connect the electrical power to the appliance until all electrical wiring has been completed.
Connecting the Remote Controller Cord 1. Check to make sure that the Remote Controller Cord has plenty of slack in order to reach the external connection terminal block. 2. Make sure the electrical power is disconnected from the Water Heater. 3. Open the external remote terminal block. 4. Locate Connector marked “PUMP” and insert pump power connector. NOTE A dummy plug is inserted from the factory. This connector must be removed before connecting the pump power connector.
Use a relay when connecting larger pumps (greater than 100 W) 1. Locate and prepare the pump control wires as step 1 - 3 for “Connecting the pump control wire”. 2. Choose a suitable installation location for the relay where it will be protected from moisture. 3. Connect the pump control wires from the heater to the signal input on the relay. 4. Cut one of the electrical supply leads and wire it across the open terminals of the relay. 5. Secure all connections and reattach the front cover. Relay (e.g.
11 Installation of the Remote Controller • The Remote Controller is not water resistant. Keep it dry. • Unplug the electrical power from the Water Heater and do not connect the electrical power to the Water Heater until the Remote Controller installation is complete. • Do not disassemble the Remote Controller. • Keep the Remote Controller in a safe location prior to mounting it on the wall to prevent metal shavings from entering the Remote Controller.
Installation 1. Attach the Mounting Bracket to the wall. The parts to be used vary depending on the attachment method. NOTE Never use electric drivers, impact drivers, etc. Tightening with excessive force may result in deformation of the Mounting Bracket and/or failures. [When attaching to a junction box] Use the Flat Head Machine Screws to attach the Mounting Bracket to the junction box. (The Dry Wall Anchor and Flat Head Tapping Screws are not used.
2. Remove the cover from the Remote Controller. (The cover is set in the Remote Controller.) Main remote controller To remove the cover, press the clear tabs on the bottom of the Remote Controller while pulling the cover forward. 5. Secure the remote controller wires by winding them around the notches. [For wiring inside the wall] Remote controller wires Pass the remote controller wires through the notch. Winding around the notches Mounting Bracket Cover 3.
[To remove the cover after installation of the Remote Controller] Put fingers into this gap. Pull the entire cover forward while pressing the sections indicated (where the fingers are). If it does not come off, insert a flat head driver into the notch at the bottom of the cover and slightly twist it to remove. NOTE Due caution is required not to scratch the Remote Controller, the cover or the wall in doing so. Post-installation Checks 1. Check if the Remote Controller is installed securely. 2.
12 Setting the DIP Switches The location of DIP switch bank The DIP switch bank is placed on the circuit board. OFF ON 1 2 3 4 5 6 7 8 [For adjusting to accommodate longer vent runs] Change DIP switch #7 and #8 by following the table below. ON = ● / OFF = ○ DIP switches Vent length condition #7 #8 ①Less than 33 ft using 2 in. (50 mm) pipe ○ ○ ②33 ft or more using 2 in. (50 mm) pipe ● ○ ③Less than 75 ft using 3 in. (75 mm) pipe ○ ● ④75 ft or more using 3 in.
13 Trial Operation The installer should test operate the Water Heater, explain to the customer how to use the Water Heater, and give the owner this manual before leaving the installation. Trial Operation DANGER There is a scald potential if the setting temperature is too high. Should overheating occur, or the gas supply fail to shut off, turn off the manual control valve to the appliance. NOTE • If installed with a Multi-System, refer to the Installation Manual provided with the System Controller (Unit).
1) Close the hot water valve and the water supply valve. O-Ring Hot water valve Water supply valve Water drain valve with water filter 2) With a bucket ready, remove the water drain valve. NOTE Approximately 0.80 gallon (3.0 L) of water will drain out. 3) Clean the water filter with a brush under running water. 4) Reattach the water drain valve (with water filter). NOTE Do not lose the O-Ring. 5) Open the hot water valve and the water supply valve.
14 Checklist After Installation After installing the Water Heater, review the following checklist. You should be able to answer “Yes” to all of the items in the checklist. If you answer NO to any item, installation is not complete. Review the appropriate sections to complete the installation. If you have additional questions or need assistance with installation, contact Noritz America at 1-866-766-7489.
Make sure that the cold water supply line and the hot water supply line are properly connected to the Water Heater. Make sure that appropriate heat insulation measures are taken according to regional climate. (e.g. wrapping with heat insulation materials, using electric heaters) Connecting the Condensate Drain (See page 40 - 41) Yes No Yes No Yes No Yes No Yes No Yes No Yes No Make sure that the condensate drain piping is connected.
15 Plumbing Applications Recirculation System • With a Recirculation System, the water from the Water Heater to the fixtures can be warmed up in advance. You can get hot water to your fixtures more quickly with less waste of water. • See the Owner’s Guide for more information about how to set up for recirculation opelation. • Scale build-up is more likely to occur in a Recirculation System, therefore it is critically important to have proper water treatment and maintenance.
Combination Potable Water and Space Heating System • The Water Heater cannot be used for space heating applications only. • Only POTABLE water may be plumbed through the Water Heater. Air Handler Pump Size the pump to provide a maximum of 3 GPM (11.3 L/min) with a head pressure equal to the loss through the water heater and Air Handler. Check Valve Check Valve required if it is not included with the pump. Gas Supply Isolation Kit Noritz recommends the use of an Isolation Kit with the installation.
16 Installation of the Quick Connect Multi-System The Quick Connect Multi-System allows the installation of two Water Heaters together utilizing only the Quick Connect Cord (part #QC-2, sold separately). System Diagram • Connect a single Remote Controller to only one of the Water Heaters. • Water Heaters must be same model or NCC199CDV (GQ-C3259WZ-FF US).
17 Installation of the Multi-System • For 6 Water Heaters or less, use the system controller (SC-401-6M). For 6 Water Heaters or more, use the system controller unit (SCU-401-12M, SCU-401-24M). • SC-301-6M and SCU-301-12M are also compatible, but they are not enable to use “Noritz Wireless Adapter (NAW-1)”. • Refer to the Installation Manual of the system controller for more information on construction and setting. 17.1 With System Controller (SC-401-6M) 17.1.
Installation of the Multi-System Hot Water Supply Hot Water Supply Pipe (1 1/4 in.-2 in.) (Size for max. flow) Water Heater 6 NOTE • If the flow is too low, the recirculation loop temperature will not be warm enough, if the flow is too high, the lifetime of the Water Heater will be reduced. • If there are multiple recirculation loops, try to make the flow rate 0.75-1.25 GPM in each loop. • Use copper or stainless water piping for the entire system.
Water Heater 2 Storage Tank Recirculation Pump 2 (If necessary) Pump Control Wires (Use external relays) Remote Controller System Controller When installing 2 pumps in parallel Storage Tank Recirculation Pump 1 Water Heater 1 Gas Pipe NOTE • 9 GPM (each) @ 40 ft of head (160°F setting or less) + piping losses through the system. • Verify the supply pressure to the Water Heaters is at least 30 psi. • Use copper or stainless water piping for the entire system.
17.1.4 Multi-System Wiring (Using SC-401-6M) Water Heater 1 No.6 Connect these to the External Remote Terminal Block in each Water Heater. System Controller No.5 No.4 No.3 PCB No.
17.2 With System Controller Unit (SCU-401-12M, SCU-401-24M) 17.2.1 Example of Installation without a Recirculation System (Using System Controller Unit) Water Heater 12 Water Heater Water Heater 2 1 System Controller Unit Remote Controller Hot Water Supply Pipe (1 1/2 in.-5 in.) (Size for max. flow) Insulate or apply heating materials to both the cold water supply piping and the hot water supply piping to prevent freezing during cold weather and to prevent heat loss through the piping.
Installation of the Multi-System Hot Water Return Line (3/4 in.-1 1/4 in.) Hot Water Supply Pipe (1 1/4 in.-5 in.) (Size for max. flow) Expansion Tank Recirculation Pump 2 (If necessary) NOTE • If the flow is too low, the recirculation loop temperature will not be warm enough, if the flow is too high, the lifetime of the Water Heater will be reduced. • If there are multiple recirculation loops, try to make the flow rate 0.75-1.25 GPM in each loop.
Hot Water Supply Line Cold Water Supply Pipe • Size the cold water supply piping to allow for maximum flow rates of the building. • Be sure to connect the cold water supply pipe between the hot water storage tank and intake side of the storage tank recirculation pump. Hot Water Return Line Return Line Recirculation Pump Thermostat Relief Valve Hot Water Storage Tank NOTE • 9 GPM (each) @ 40 ft of head (160°F setting or less) + piping losses through the system.
17.2.4 Multi-System Wiring (Using SCU-401-12M, SCU-401-24M) • The below diagram shows the connection of 3 Water Heaters to the System Controller Unit. When connecting 4 or more Water Heaters, follow the same procedure. • Connect the Water Heaters to the System Controller Unit follwing the detailed wiring instructions included with the System Controller Unit. • Always connect a Remote Controller to the System Controller Unit.
18 Maintenance 18.1 Periodic Check • Check the following to ensure proper operation of the Water Heater periodically . • Also check the items of maintenance described in the Owner’s Guide. [Venting System] • The venting system must be examined periodically by a qualified service technician to check for any leaks or corrosion. • Do not obstruct the flow of combustion and ventilation air. [Burner] • Check the burner flame periodically for a proper blue color and consistency.
18.2 P rocedure for Flushing the Heat Exchanger NOTE This procedure is only intended for use by a qualified service professional or authorized Noritz Service Representative. Any unauthorized use of this procedure may result in voiding the Noritz America Limited Warranty. Contact Noritz America (1-866-766-7489) for additional support. If the alarm code “C1#*” is flashing on the Remote Controller, it means there is Scale Build-up in the Heat Exchanger.
For Single Water Heater [Procedure 1. Flushing the Heat Exchanger] 1. Open the front cover. 2. Connect the blue connector marked “FLUSH” for flushing near the Circuit Board. Circuit Board Connect FLUSH FLUSH 3. Then the code CCC is displayed on the Remote Controller. 4. Turn on the circulation pump to circulate the flushing solution through the Water Heater for 1 hour at a rate of 1.5 GPM or more. 5.
For Quick Connect Multi-System 1. Open the front covers. 2. Connect the blue connector marked “FLUSH” for Water Heater needing to be flushed. (The Water Heater is isolated from Quick Connect Multi-system when the blue connector marked “FLUSH” for flushing is connected. Do not need to disconnect the Quick Connect Cord.) Sub Water Heater Main Water Heater Circuit Board Quick Connect Cord Connect Do not need to disconnect. FLUSH 3. Then the code CCC or FCC is displayed on the Remote Controller.
For Multi-System 1. Open the front covers. 2. Connect the blue connector marked “FLUSH” for Water Heater needing to be flushed. (The Water Heater is isolated from Multi-System when the blue connector marked “FLUSH” for flushing is connected. Not need to disconnect the “Cord for the Multi-System”.) Water Heater 1 Water Heater 2 Water Heater 6 Circuit Board Circuit Board Cord for Multi-System System Controller Connect Do not need to disconnect. Remote Controller FLUSH 3.
6. When 1 hour passes, turn off the circulation pump. LED light is flashing. LED light is flashing while flushing the heat exchanger. When 1 hour passes, LED light is OFF. 7. Rinse and clean the flushing solution out of the Water Heaters in accordance with “For Single Water Heater [Procedure 2]”. (See the “Procedure 2.1-2.5”.) 8. Disconnect the blue connector marked “FLUSH” for flushing. The Code “CCC” goes out on the Remote Controller. 9. Close the front covers. 10.
