Temperature and Pressure Relief Valve
WARNING
Explosion Hazard
•If the temperature and pressure relief valve is dripping or leaking, have a licensed plumber repair it.
•Do not plug valve.
•Do not remove valve.
•Failure to follow these instructions can result in death or an explosion.
Manually operate the temperature and pressure relief valve at least once a year to make sure it is working properly (see Figure 27). To prevent water damage, the valve must be properly connected to a discharge line that terminates at an adequate drain. Standing clear of the outlet (discharged water may be hot), slowly lift and release the lever handle on the temperature and pressure relief valve to allow the valve to operate freely and return to its closed position. If the valve fails to completely reset and continues to release water, immediately shut off the manual gas valve and the cold water inlet valve and call a qualified service technician.
Temperature and Pressure
Relief Valve
Manual Relief Valve
Discharge line to drain
Figure 27 T&P Valve Test
Replacement Parts
Replacement parts may be ordered through your plumber or the local distributor. When ordering replacement parts, always have the following information ready:
1.model, serial and product number
2.type of gas
3.item number
4.parts description
See “Replacement Parts Illustration” for a list of available repair parts.
VII) COMBO HEATING
WARNING:
Keep the area around the heater clear and unobstructed.
This section serves as a guide for the installation and use of “Combo” heating systems utilizing a domestic water heater that has been specifically approved for such use. It is writ- ten for those knowledgeable in the required trades and pro- fessionals involved in the design and installation of Combo Heating Systems.
It is the responsibility of the installer/designer to follow all applicable codes to ensure the effectiveness and safety of the installation.
Read Before Proceeding
CAUTION:
Keep safety your first priority. Take all pre- cautions to avoid creating a fire, health or safety hazard.
The following requirements must be met for the installation of Combo Heating Systems:
1.All components used for the distribution of water in the heating loop must be suitable for potable water. These include all piping, fittings, solder and fluxes, pumps for circulation of water, valves, etc.
2.The water heater must not be connected to a hydronic heating system that has been used previously.
3.No boiler treatment chemicals of any kind shall be intro- duced into the system.
4.The Combo System components must be selected and sized to meet and maintain the total calculated demands for both domestic service hot water and space heating requirement. The sizing and installation must be performed in accordance with good engineering prac- tice such as “ASHRAE Handbooks”, HRAI, “Hydronics Institute Manuals”, CSA B149.1, NFPA 54, ANSI Z223.1, CSA F280, National/Provincial Building Codes, CSA C22.1, ANSI/NFPA 70, CSA B51 and/or codes having jurisdiction.
5.The air handler (fan coil) and/or the circulating pump in a baseboard hydronic loop will require a dedicated 120V circuit. This must be provided and identified for this purpose.
6.All piping between the water heater and the air handler or hydronic baseboard loop must be adequately insulat- ed to reduce heat loss.
7.If the local jurisdiction requires a
8.“Combo” Heating Systems require higher water temper- atures than other applications. When the system is used to supply water for Combo Heating applications, a means, such as mixing valve, must be installed to tem- per the water in order to reduce scald hazard potential (see Figures 28 & 29).
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