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 non-potable water heating appliance.
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.
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 temperature-pressure relief valve that complies with the standard for relief valves and automatic gas shutoff devices for hot water supply system, ANSI Z21.22, for Canada seeCAN/CSA B149.1-00. FORSAFEOPERATIONOFTHEWATERHEATER, THERELIEFVALVE(S)MUSTNOTBEREMOVEDORPLUGGED.
ASME ratings cover pressure relief capacities. A.G.A. 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 and automatic gas shutoff devices for hot water supply systems. ANSI Z21.22.
WARNING
THE PURPOSE OF RELIEF VALVE ISTOAVOID 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.
ADRAIN LINE MUST BE CONNECTED TOTHE RELIEF VALVETO DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING OR WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLETAND MUSTNOTCONTAIN VALVES, RESTRICTIONS NOR SHOULDITBELOCATEDINFREEZINGAREAS. DONOTTHREADORCAP THE END OF THIS LINE. RESTRICTED OR BLOCKED DISCHARGE WILL DEFEATTHEPURPOSEOFTHEVALVEANDISUNSAFE. DISCHARGELINE SHALL BE INSTALLED TOALLOW COMPLETE DRAINAGE OF BOTH THE VALVEAND 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 latest version of the National Fuel Gas Code. For Canadian installations consult Canadian Installation Code CAN/CSA B149.1-00.
WARNING
THE HEATER IS NOTINTENDED FOR OPERATIONATHIGHERTHAN 14.0" W.C.(3.48Kpa)-NATURALGASSUPPLYGASPRESSURE. EXPOSURETO HIGHER SUPPLYPRESSURE MAYCAUSE DAMAGE TO THE GAS VALVE WHICHCOULDRESULTINFIREOREXPLOSION. IFOVERPRESSUREHAS OCCURREDSUCHASTHROUGHIMPROPERTESTINGOFGASLINESOR EMERGENCYMALFUNCTIONOFTHESUPPLYSYSTEM,THEGASVALVE MUST BE CHECKED FOR SAFE OPERATION. MAKE SURE THAT THE OUTSIDEVENTSONTHESUPPLYREGULATORSANDTHESAFETY VENT VALVESARE PROTECTEDAGAINST BLOCKAGE. THESEARE PARTS OF THE GAS SUPPLY SYSTEM, NOT THE HEATER. VENT BLOCKAGE MAY OCCURDURINGICESTORMS.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPEROPERATION,FIREOREXPLOSION.
IFCOPPERSUPPLYLINESAREUSEDTHEYMUSTBEINTERNALLYTINNED ANDCERTIFIEDFORGASSERVICE.BEFOREATTACHINGTHEGASLINE, BE SURETHATALLGAS PIPE IS CLEAN ONTHE INSIDE.
TOTRAPANYDIRTOR FOREIGN MATERIALIN THE GAS SUPPLYLINE,A DIRTLEG(SOMETIMESCALLEDSEDIMENTTRAPORDRIPLEG)MUSTBE INCORPORATED IN THE PIPING (SEE FIG. 5). THE DIRT LEG MUST BE READILYACCESSIBLEAND NOT SUBJECTTO FREEZING CONDITIONS. INSTALLINACCORDANCEWITHRECOMMENDATIONSOFSERVINGGAS SUPPLIERS. REFER TOTHE LATESTVERSION OF THE NATIONALFUEL GAS CODE. For Canadian installations consult Canadian Installation Code CAN/CSA B149.1-00.
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.
