11
HRP Water Piping
All hot water piping MUST be a minimum of 5/8” O.D. copper
tube to a maximum distance of 15 feet. For distances beyond 15
feet, but not exceeding 60 feet, use 1/2” copper tube. Separately
insulate all exposed surface of both connecting water lines with
3/8” wall closed cell insulation. Install isolation valves on supply
and return to the heat recovery. (See Fig. 11)
Water Tank Preparation
1. Turn off electrical or fuel supply to the water heater.
2. Attach garden hose to water tank drain connection and run
other end of hose out doors or to an open drain.
3. Close cold water inlet valve to water heater tank.
4. Drain tank by opening drain valve on the bottom of the
tank, then open pressure relief valve or hot water faucet.
5. Once drained the tank should be flushed with cold water
until the water leaving the drain hose is clear and free of
sediment.
6. Close all valves and remove the drain hose.
7. Install HR water piping.
Water Tank Refill
1. Open the cold water supply to the tank.
2. Open a hot water faucet to vent air from the system until
water flows from the faucet, then close.
3. Depress the hot water tank pressure relief valve handle to
ensure there is no air remaining in the tank.
4. Carefully inspect all plumbing for water leaks. Correct as
required.
5. Using the air bleed valve, purge all air from water piping,
allowing all air to bleed out until water appears at valve.
6. Before restoring the power or fuel supply to the water
heater, adjust the temperature setting on the tank
thermostat(s) to ensure maximum utilization of heat
available from the refrigeration system and to conserve the
most energy.
On tanks with thermostats and both upper and lower ele-
ments, the lower element should be turned down to 100
_
F,
while the upper element should be adjusted to 120
_
F. De-
pending upon the specific needs of the customer, you may
need to adjust the upper element differently.
On tanks with a single thermostat, lower the thermostat
setting to 120
_
F or the “LOW” position. After thermostat
adjustments are completed, replace access cover and restore
electrical or fuel supply to water heater.
IMPORTANT: Copper should be used for piping from HRP to
domestic water tank(s). Use 5/8” (16mm) O.D. copper or
larger. Refer to local codes for hot water piping. Insulate the
water lines between the GHP and the water heater with a
minimum of 3/8” (10mm) closed cell insulation.
Shut-off Ball Valve
Air Bleed Valve
Domestic Hot Water Supply
Water Heater
(w/active elements)
Domestic Cold Water Supply
Water Heater
(no active elements
pre-heat tank)
Cold Water In
HP
Hot Water Out
Shut-off Ball Valve
Air Bleed Valve
Domestic Cold Water Supply
HP
Hot Water Out
Water Heater
(w/active elements)
One Tank System
Two Tank System (preferred)
Package unit shown. GZ split unit arrangement similar with different water locations on unit.
A150174
Fig. 11 -- HRP Water Piping
