THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed as shown in Figure 3.
Thermometers are installed in the system as a means of detecting the temperature of the outlet water supply.
COMBINATION 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 diagram on page 6 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.
RELIEF VALVE
This water heater is equipped with a combination
ASME ratings cover pressure relief capacities. ANSI 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). This valve shall comply with the standard for relief valves for hot water supply systems
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 VALVE AND LINE.
See SERVICE INFORMATION section for procedure and precautions.
The type, size and location of the relief valves must be in accordance with local codes. The location of the relief valve is shown in Figure 1. The heater has a factory installed high temperature limit switch.
GAS PIPING
Contact your local gas service company to ensure that adequate gas service is available and to review applicable installation codes for your area.
Size the main gas line in accordance with Table 4. The figures shown are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is considered normal for low pressure systems. Note: Fittings such as elbows, tees and line regulators will add to the pipe pressure drop. Also refer to the current edition of the National Fuel Gas Code. For Canadian installations consult Canadian Installation Code
WARNING
The minimum gas supply pressure for input adjustment is 6.0" kPa W.C. for natural gas (11.0" kPa W.C. for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN 14" kPa WATER COLUMN SUPPLY PRESSURE. EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE CONTROL WHICH COULD RESULT IN FIRE OF EXPLOSION. If overpressure has occurred such as through improper testing of gas lines or emergency malfunction of the supply system, the control must be checked for safe operation. Make sure that the outside vents on the supply regulators and the safety vent valves are protected against blockage. These are parts of the gas supply system not the heater. Vent blockage may occur during ice storms.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE INTERNALLY TINNED AND CERTIFIED FOR GAS SERVICE. BEFORE ATTACHING THE GAS LINE, BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED SEDIMENT TRAP OR DRIP LEG) MUST BE INCORPORATED IN THE PIPING (SEE FIG. 5). THE DIRT LEG MUST BE READILY ACCESSIBLE AND NOT SUBJECT TO FREEZING CONDITIONS. INSTALL IN ACCORDANCE WITH RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER TO THE CURRENT EDITION OF THE NATIONAL FUEL GAS CODE. For Canadian installations consult Canadian Installation Code CAN/
To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male threads of pipe joints. Do not apply compounds to the first two threads. Use compounds resistant to the action of liquefied petroleum gases.
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