GSW 61009 REV. C (09-03) manual Vi Combo Heating

VI) COMBO HEATING

When using this water heater in the application of a combi- nation space and potable water heating system, be sure to follow instructions provided with the water heater and the manual shipped with the air handler.

NOTE the following warnings:

1.The piping and components connected to the water heater for the space heating applications shall be suit- able for use with potable water. The system should be installed with new, non-ferrous piping. Do not use pip- ing, pumps, valves, fittings, solder, gluing and pipe sealant that are not completely compatible with potable water.

2.A water heater which will be used to supply potable water must not be connected to any heating system or components previously used with a non-potable water heating appliance. Do not use: piping that has been treated; broiler seal chromates; or other chemicals.

3.Do not use this heater as a replacement for an existing boiler installation.

4.Do not introduce toxic chemicals such as those used for boiler treatment, into the potable water used for space heating.

5.If the space heating water system requires water with temperatures in excess of 60°C (140°F), a mixing valve or other means must be installed in the potable hot water supply to temper the water and reduce scald haz- ard potential.

6.If the heater is installed with a back-flow preventer on the incoming water line or in a closed system, a diaphragm-type expansion tank must be installed in the system to prevent weeping due to expansion (see Figure 2B).

7.Proper sizing of the water heater for the given space and potable heating application is essential to ensure adequate heating capacity. The sizing and installation of such combination system must be performed by quali- fied personnel and be in accordance with public utility requirements and/or Codes having jurisdiction.

The sizing of the water heater should be based on the design heat loss of the structure to be heated plus the potable water requirements.

IT IS IMPORTANT THAT THE WATER HEATER USED BE OVERSIZED TO ALLOW ADEQUATE HEATING AND POTABLE WATER HEATING CAPACITY.

CHECK VALVE

HOT

WATER

TO

HOUSE

DIRECT

VENT

WATER

HEATER

CIRC. PUMP

COLD TO

WATER HEATER

AIR HANDLER

RADIATOR OR RADIANT FLOOR PIPING ARE

VIABLE ALTERNATIVES TO AIR HANDLER.

Figure 5

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