PAC PAS Installation & Operation Manual - page 23
INSTALLATION AND OPERATION MANUAL
PAC HEAT RECOVERY WATER HEATER
Page 22
damaged or otherwise needs replacement should be installed. The valve must be
marked with a maximum set pressure of 150psi for use on all PAC tank.
If a water mixing valve is installed in the system, make sure that check valves are in
both hot and cold water lines. If this precaution is not taken, hot water may be drawn
into the cold water lines. If this precaution is not taken, hot water may be drawn into
the cold water system under certain system operation conditions.
In some hot water systems, the expansion of heater may effected to leak at the
relief valve. That’s might occur a problem. Should be installed the expansion tank.
In many multi-unit installations, it is advantageous to install a circulating pump
and form a loop plumbing circuit through the Heat Recovery Water Heater. This will
usually increase the heat recovery efficiency of the system by keeping the total
system water volume at a uniform temperature and picking up the most available heat
from any refrigeration unit which may be running. Consult a plumbing supply house
for a hot water circulating pump suitable for your particular installation. All pumps
used in a heat Recovery Water Heater circulation system must be suitable for potable
water use. Multiple Heat Recovery Water Heater installations may be piped in parallel
if care is taken to assure equal flow through all of the Heat Recovery Water Heater.
Parallel plumbing is usually reserved for installations having a common refrigeration
compressor on all of the Heat Recovery Water Heater.
Under certain circumstances, it may be necessary to operate a high
temperature or booster heater loop at temperature above those attainable or
desirable in the PAC Heat Recovery Water Heater. At those times a piping scheme
should be used. This allows the PAC tank to operate at its optimum heat reclaim
while the system temperature is at a higher level.
WATER OUT PIPE ( RELIEF VALVE )