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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 two-temperature systems.
When used with a separate storage tank, the circulation may
be either by gravity or by means of a circulating pump. When a
circulating pump is used it is important to note that the ow rate
should be slow so that there will be a minimum of turbulence
inside the heater.
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 eld 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 specic relief valve
requirements.
WARNING
THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE
PRESSURE OR TEMPERATURE INTO THE STEAM RANGE,
WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION,
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.