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NOTE: Rear and Combination flue units must be fitted with a T&P Relief Valve WATTS type 40XL-5 or equivalent. Failure to install and maintain a new, properly listed temperature and pressure relief valve will release the manufacturer from any claims which may result from excessive temperature or water pressure. Closed Water Systems During the heating cycle of the water heater the water expands creating a pressure build-up in the water system. The water supply meter may contain a check valve or back flow preventer. This will create a closed water system. A Temperature and Pressure (T&P) Relief Valve (150 psi (1034 kPa) maximum pressure setting, must be installed in the system (see .Temperature and Pressure (T&P) Relief Valve. section). To prevent the T&P valve from discharging hot water, the loss of energy and reduce the possible build . 9. COLD WATER BREECH SHUT-OFF CONNECTION HOT WATER AQUASTAT TEMPERATURE CONTROL T&P VALVE DRIP TUBE DRAIN VALVE OUTLET Figure 7 PLUMBING CONNECTIONS (CENTER FLUE) 150 TO 305mm 6 TO 12. CENTER OF BLAST TUBE NON-COMBUSTIBLE FLOOR TOP NIPPLE up of lime in the T&P valve, there are two recommendations: 1. Install a pressure relief (only) valve in the cold water supply line. Make sure that the discharge of this valve is directed to a drain and it is protected from freezing. or: 2. Install an expansion tank on the cold water supply line. For every 50 gallons of stored water, the expansion tank must have a minimum capacity of 1.5 gallons. Vacuum Relief Valves Water heaters shall be protected against loss of water from siphoning due to loss of supply pressure by a vacuum relief valve installed in the cold water supply line at a level above the top of the water heater. Where heating equipment has a bottom supply, the cold water supply piping shall be carried above the top of the heater before being routed to the supply connection and have a vacuum relief valve installed in it at a level above the top of the storage tank. The vacuum relief valve shall be in compliance with the standard ANSI Z21.22 (latest issue). Installation Of The Aquastat (Temperature Control) This heater operates automatically under the control of the aquastat, which responds to the demand of hot water. Depending on the model, the aquastat, well and wiring is either installed on the heater, or included in the carton containing the burner. If the installation of the aquastat is COLD WATER SHUT-OFF AQUASTAT TEMPERATURE CONTROL T&P VALVE COLD INLET AND DRAIN VALVE COMBINATION HOT WATER OUTLET Figure 8 PLUMBING CONNECTIONS (CENTER/REAR FLUE) 150 TO 305mm 6 TO 12. FLUE COLLAR CAPPED FOR REAR FLUE USE (OPTIONAL) VACUUM BREAKER CENTER OF BLAST TUBE NON-COMBUSTIBLE FLOOR required, proceed as follows: 1. Locate the aquastat well opening in the front of the heater. 2. Apply a good grade of pipe joint compound to the threads on the well. 3. Install the well in the tank opening, tighten firmly to ensure there are no leaks. 4. Insert the sensing bulb of the aquastat into the well and secure the aquastat to the well using the screw provided. 5. Wire the control to the burner as shown in the wiring diagrams (Figures 9, 10 & 11). Electrical Supply Connection. General wiring requirements: Electric shock hazard. Can cause severe personal injury or death if power source, including service switch on heater, is not disconnected before installing or servicing. Installations must comply with the latest edition these codes: • .Canadian Electrical Code Part 1 (CSA C22.1). (Canada). • .National Electrical Code, ANSI/NFPA 70., (USA). . Any additional local, provincial, national or state codes. Wiring must be N.E.C. Class 1. If original wire supplied with heater must be replaced, type 105°C wire or equivalent must be used. Supply wiring to heater and additional control wiring must be 14 ga. or heavier. Provide an electrical ground at heater as required by codes. . 10 . R7184 L1 BLACK JUMPER T T3 LIMIT RED LINE VOLTAGE THERMOSTAT OR AQUASTAT® LIMIT L1 HOT CONTROL ENVIRACOM. 2 L2 WHITE L2 NEUTRAL BLOCKED VENT TERMINAL SAFETY 1 VALVE VIOLET OIL VALVE SWITCH (CANADA BURNER ONLY) MOTOR ORANGE BURNER MOTOR IGNITOR BLUE IGNITOR TO REMOTE ALARM CIRCUIT ALARM CAD CELL YELLOW YELLOW CAD CELL Figure 9 TYPICAL PRIMARY CONTROL BURNER JUNCTION BOX WIRING (R7184P). R7184 T LINE VOLTAGE JUMPER T3 L1 BLACK THERMOSTAT OR AQUASTAT® LIMIT L1 HOT CONTROL ENVIRACOM. 2 L2 WHITE L2 NEUTRAL BLOCKED VENT TERMINAL SAFETY 1 VALVE VIOLET OIL VALVE SWITCH (CANADA BURNER ONLY) MOTOR ORANGE BURNER MOTOR IGNITOR BLUE IGNITOR TO REMOTE ALARM CIRCUIT ALARM CAD CELL YELLOW YELLOW CAD CELL Figure 10 TYPICAL PRIMARY CONTROL BURNER JUNCTION BOX WIRING (R7184B). 48245 BLACK L1 HOT LIMIT T JUMPER WHITE L2 NEUTRAL BLOCKED T VENT SAFETY GROUND SWITCH F (CANADA JUNCTION BOX ONLY) F CAD CELL OIL VALVE ORANGE BURNER MOTOR IGNITOR Figure 11 TYPICAL PRIMARY CONTROL BURNER JUNCTION BOX WIRING (48245). . 11 . Startup Installation Checklis. Check Here NOTE: refer to the instruction manual supp...

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