Heat Recovery Package - Carrier GW Series Installation Instructions Manual

HEAT RECOVERY PACKAGE

The Heat Recovery package is a factory mounted option. It
consists of a forced pumped unit that employs a circulating pump
to move water through a double wall/ vented heat exchanger and
returns the heated water to the water tank. The water is heated by
superheated refrigerant discharge gas from the compressor. This
waste heat of the cooling mode, captured by the heat recovery,
increases the capacity and efficiency of the heat pump unit. If the
air temperature is uncomfortable coming from the air vents in
heating mode the heat recovery may need to be turned off. In
heating mode, the heat recovery captures heat that would normally
be used for space heating.
CAUTION
!
UNIT DAMAGE AND/OR OPERATION HAZARD
Failure to follow this caution may result in unit damage
and/or improper equipment operation.
If heat recovery unit is installed in an area where freezing
may occur, the unit must be drained during winter months
to prevent heat exchanger damage. Heat exchanger
ruptures that occur due to freezing will void the heat
recovery package warranty along with the heat pump
warranty.
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.
Fig. 9 - - Heat Recovery Package
HR Water Piping
All hot water piping MUST be a minimum of 3/8" 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. 9)
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. Purge all air from HRP by depressing the Schrader valve on
the HR unit. Allow all air to bleed out until water appears at
the valve.
IMPORTANT: All piping from HRP to domestic water tank
must be copper or any metal of stronger alloy.
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.
7. After thermostat adjustments are completed, replace access
cover and restore electrical or fuel supply to water heater.
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