FIGURE 7
•Where a separate vent connection is not available and the vent pipe from the heater must be connected to a common vent with an oil burning furnace, the vent pipe should enter the smaller common vent or chimney at a point above the large vent pipe.
MULTIPLE HEATER MANIFOLD
When horizontally manifolding two or more heaters vent as shown in Figure 8. Refer to NFPA 54/ANSI Z223.1 for venting multiple heaters.
FIGURE 8
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams (see pages 12 thru 17 of this manual) 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.
WATER (POTABLE) HEATING
AND SPACE HEATING
1.All piping components connected to this unit for space heating applications shall be suitable for use with potable water.
2.Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system.
3.This unit may NEVER be connected to any existing heating system or component(s) previously used with a
4.When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to installation diagrams on pages 12 thru 17 of this manual for suggested piping arrangements.
5.These water heaters cannot be used in space heating applications only.
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 in such closed systems, 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 the water.
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 water heater is equipped with a combination
THE WATER HEATER, THE RELIEF VALVE(S) MUST NOT BE REMOVED OR PLUGGED.
ASME ratings cover pressure relief capacities. CSA ratings cover release rate with temperature actuation.
In addition to the appliance relief valve, each remote storage tank which may be used in conjunction with this appliance shall also be installed with a properly sized, rated and approved combination temperature (ANSI) and pressure (ASME) relief valve(s).
WARNING
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR HEATER DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE RELIEF VALVE AND TANK.
Your local code authority may have other specific relief valve requirements.
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 DEFEAT THE PURPOSE OF THE VALVE AND IS UNSAFE. DISCHARGE LINE SHALL BE INSTALLED TO ALLOW COMPLETE DRAINAGE OF BOTH THE VALVEAND LINE.
See SERVICE INFORMATION section for procedure and precautions.
8
