Heat Recovery Package (Hrp) - Bryant Gt 024 Installation Instructions Manual

Heat Recovery Package (HRP)

(optional)
The heat recovery package is a factory installed option on GT
series heat pumps. The HRP can be used to heat potable water
during unit operation using waste heat from the compressor
discharge gas. In some cases the HRP can provide most or all of
the hot water requirements for a typical home.
The HRP consists of three major components:
1. Double wall, vented refrigerant to water heat exchanger
2. Circulating pump
3. Control circuit
The heat exchanger is rated for use with potable water and is
acceptable for use as a domestic water heating device in most
building codes.
The pump circulates water between the domestic hot water tank
and HRP heat exchanger in the Heat Pump. The control circuit
ensures that the HRP only operates when there is available heat
from the compressor and when the water is within a safe
temperature range of below 140_F. When the heat pump
compressor operates, the HRP will monitor the temperature of the
discharge gas from the compressor. Once discharge gas is hot
enough to provide useful heat to the domestic water tank, the
circulating pump will be enabled, drawing water from the tank,
through the HRP heat exchanger and then depositing the heated
water back into the tank.
If the water temperature reaches 140_F, the circulating pump is
disabled to prevent over heating of the domestic water. The HRP is
provided with an on/off switch in case the end user desires that the
HRP be inactivated (typically during the winter months when
space heating is most important).
Domestic Hot Water Supply
Domestic Cold Water Supply
Hot Water Out
Water Heater
(w/active elements)
Two Tank System (preferred)
Domestic Cold Water Supply
Hot Water Out
Cold Water In
Water Heater
(w/active elements)
Package unit shown. GT split unit arrangement similar with different water locations on unit.
Fig. 22 - - HRP Water Piping
!
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 HRP water piping.
HRP 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. 22)
One Tank System
Air Bleed Valve
HP
Water Heater
(no active elements
pre-heat tank)
19
CAUTION
Shut-off Ball Valve
Air Bleed Valve
Shut-off Ball Valve
HP
A150174