INSTALLATION AND OPERATION MANUAL
PAC HEAT RECOVERY WATER HEATER
SECTION 2.0 - INSTALLATION
2.1 Installing Water Piping
PAC Fre-Heater is equipped with
3
/4" or 1
1
/2" connections for cold water
inlet and hot water outlet, depending on the specific model
The water inlet connection is labeled “Cold” and the outlet connection is
labeled “Hot”
The pipe from the “Hot” outlet should go to the conventional water heating
system if one is used. See Figures.
A water bypass line should always be provided so the Fre-Heater(s) can be
bypassed for service without shutting down the total water heating system.
NOTE:
Be sure there are no leaks at the water connections which might cause
the insulation to become wet.
IMPORTANT NOTE: To reduce the risk of excessive temperatures and pressures
in this water heater, a pressure/temperature relief valve has been installed by the
manufacturer and should not be removed. This valve should be provided with a
3
/4" drain line oriented so that any discharge from the valve will exit within 6"
above or at any distance below the structural floor and cannot contact any live
electrical part. The discharge opening must not be blocked or reduced in size
under any circumstances. Any additional protective equipment required by
local codes must also be installed. In the event that the pressure/temperature
relief valve is damaged or otherwise needs replacement, a combination
temperature and pressure relief valve, certified by a nationally recognized
testing laboratory that maintains periodic inspection of production of listed
equipment, as meeting the requirements for Relief Valves and Automatic Gas
Shut-Off Devices for Hot Water Supply Systems, ANSIZ 2 1.22-1971, should be
installed. The valve must be marked with a maximum set pressure of 150 psig
for use on all PAC Fre-Heaters.
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