WATER SYSTEM PIPING
Piping Installation
Piping, fittings, and valves should be installed according to the installation drawing (Figure 22). If the indoor installation area is subject to freezing temperatures, the water piping must be protected by insulation.
The water supply pressure should not exceed 80 psi. If this occurs, a pressure reducing valve with a bypass may need to be installed in the cold water inlet line. This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.
IMPORTANT: Heat cannot be applied to the water fittings on the heater as they may contain nonmetallic parts. If solder connections are used, solder the pipe to the adapter before attaching the adapter to the hot and cold water fittings.
IMPORTANT: Always use a good grade of joint compound and be certain that all fittings are drawn up tight.
1.Install the water piping and fittings as shown in Figure 22. Connect the cold water supply (3/4” NPT) to the cold water inlet fitting. Connect the hot water supply (3/4” NPT) to the hot water outlet fitting.
IMPORTANT: Some models may contain energy saving heat traps to prevent the circulation of hot water within the pipes. Do not remove the inserts within the heat traps.
2.The installation of unions in both the hot and cold water supply lines is recommended for ease of removing the water heater for service or replacement.
3.The manufacturer of this water heater recommends installing a mixing valve or an
4.If installing the water heater in a closed water system, install an expansion tank in the cold water line as specified under “Closed System/Thermal Expansion.”
5.Install a
6.A temperature and pressure relief valve must be installed
in the opening marked “Temperature and Pressure (T & P) Relief Valve” on the water heater. A discharge line must be added to the opening of the T&P Relief Valve. Follow the instructions under “Temperature and Pressure Relief Valve.”
7.After piping has been properly connected to the water heater, remove the aerator at the nearest hot water faucet. Open the hot water faucet and allow the tank to completely fill with water. To purge the lines of any excess air, keep the hot water faucet open for 3 minutes after a constant flow of water is obtained. Close the faucet and check all connections for leaks.
IN A CLOSED SYSTEM USE A
THERMAL EXPANSION TANK
COLD WATER SUPPLY TO FIXTURES
PRESSURE REDUCING VALVE
WITH BYPASS
HOT WATER | COLD WATER |
OUTLET | INLET |
COLD WATER INLET VALVE
| TEMPERATURE AND PRESSURE (T&P) | ||
| RELIEF VALVE (OPTIONAL TOP T&P | ||
| RELIEF VALVE NOT SHOWN) | ||
| DISCHARGE PIPE | ||
| (DO NOT CAP OR PLUG) | ||
|
|
| MASSACHUSETTS: INSTALL |
| DRAIN LINE | A VACUUM RELIEF IN COLD | |
| 3/4” ID |
| WATER LINE PER SECTION |
1” MINIMUM | MINIMUM | 19 MGL 142. | |
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| |
METAL |
| 6” MAXIMUM | |
DRAIN PAN |
| AIR GAP | |
DRAIN |
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|
FIGURE 22. |
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| TEMPERED WATER | ||
UNTEMPERED | TO FIXTURES | ||
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HOT WATER |
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| COLD |
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| WATER |
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| INLET |
HOT
WATER
OUTLET
MIXING VALVE (SET TO 120°F)
FOLLOW THE MIXING
VALVE MANUFACTURER’S
INSTRUCTIONS
FIGURE 23.
Please note the following:
•The system should be installed only with piping that is suitable for potable (drinkable) water such as copper, CPVC, or polybutylene. This water heater must not be installed using iron piping or PVC water piping.
•Use only pumps, valves, or fittings that are compatible with potable water.
•It is recommend that only full flow ball or gate valves are used in water piping installations. The use of valves that may cause excessive restriction to water flow is not recommended.
•Use only 95/5
•Piping that has been treated with chromates, boiler seal, or other chemicals must not be used.
•Chemicals that may contaminate the potable water supply must not be added to the piping system.
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