ROBERTSHAW® 7000 DERHC GAS CONTROL VALVE
FIGURE 10.
WATER LINE CONNECTIONS
Following are detailed installation diagrams for typical methods of application for the water heaters.
The water heater may be installed by itself, or with a separate storage tank, on both single and
If a water heater is installed in a closed water system, contact the water supplier or local plumbing inspector on how to control this situation.
CAUTION
A closed system will exist if a check valve (without bypass) pressure reducing valve (without bypass), or a water meter (without bypass) is installed in the cold water line between the water heater and street main (or well).
Excessive pressure may develop causing premature tank failure or intermittent relief valve operation. This is not a warranty failure. An expansion tank or a similar device may be required in the inlet supply line between the appliance and the meter or valve to compensate for the thermal expansion of water under supply pressure.
SYSTEM CONNECTIONS
The system installation must conform to these instructions and to
the local code authority having jurisdiction. Good practice requires that all heavy piping be supported.
THERMOMETERS (Not supplied)
Thermometers should be obtained and field installed as shown in the installation diagrams.
Thermometers are installed in the system as a means of detecting the temperature of the outlet water supply.
RELIEF VALVE
This heater is equipped with an approved temperature and pressure relief valve. ASME ratings cover pressure relief. A.G.A ratings cover release rate with temperature actuation.
FOR SAFE OPERATION OF THE WATER HEATER, THE RELIEF VALVE(S) MUST NOT BE REMOVED OR PLUGGED.
In addition to the appliance relief valve, each remote storage tank that may be used in conjunction with this appliance shall also be installed with a properly sized, rated and approved temperature (ANSI) and pressure (ASME) relief valve(s). This relief valve shall comply with the standard for relief valves and automatic gas shut- off devices for hot water supply systems, ANSI Z21.22/CSA 4.4.
Your local code authority may have other specific relief valve
requirements.
WARNING
THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICHMAYCAUSESCALDINGATFIXTURES,TANKEXPLOSION, AND SYSTEM OR HEATER DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE RELIEF VALVE AND THE TANK.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE TO DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING OR WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES, RESTRICTIONS NOR SHOULD IT BE LOCATED IN FREEZING AREAS. DO NOT THREAD OR CAP THE END OF THIS LINE. RESTRICTED OR BLOCKED DISCHARGE WILL DEFECT THE PURPOSE OF THE VALVE AND IS UNSAFE. DISCHARGE LINE SHALL BE INSTALLED TO ALLOW COMPLETE DRAINAGE OF BOTH THE VALVE AND LINE.
®Robertshaw is a registered trademark of the Robertshaw Controls Company Corporation.
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