Outdoor Compressor Section Only - Carrier GT-PX Split Series Installation, Operation & Maintenance Instructions Manual

Hot Water Generator Module Refrigeration Installation -
3. Turn the heat pump and heat pump power supply "OFF"
and CONNECT POWER TO THE HWG PUMP as shown
in the unit wiring diagram. Connect the pump power lead
as instructed on the tag attached to the pump wiring.
4. The HWG pump should not run if the compressor is
not running.
5. The temperature difference between the water entering
and leaving the HWG coil should be approximately 5-10°F
[3-6°C].
6. Allow the unit to operate for 20 to 30 minutes to insure
that it is functioning properly.
General Information
The HWG Module consists of an all-copper, vented double-
wall heat exchanger and a water-cooled water circulating
pump. The pump is controlled by the use of one or more
limit switches. Power for the pump is provided from either
the compressor contactor of the outdoor section of the heat
pump, or it may come from a remote power source if the
appropriate controls are used.
Location/Mounting
The HWG module should be mounted as close to the heat
pump outdoor section as possible, in order to minimize
the length of refrigerant run. Indoor mounting is preferred,
where practical, to reduce the likelihood of freezing ambient
temperature. It is recommended that the HWG module be
mounted above the system compressor in order to promote
proper oil movement and drain-down. This means that the
HWG module can be wall mounted in any orientation
except for stubs up. Mounting should be accomplished
by fastening the HWG module cabinet to the wall or other
selected vertical surface. A fl ange is provided at the top rear
of the unit. Any fastener suitable for supporting a 12 pound
[5.4] vertical load is acceptable.
SPECIAL NOTE: The selected mounting location and
orientation must allow the circulator pump to be positioned
with the motor shaft horizontal. DO NOT install the Heat
Recovery Unit fl at on its back.
Refrigerant Line Installation
Before starting the installation into the refrigerant circuit,
inspect and note the condition and performance of the
heat pump. Disconnect power to the heat pump outdoor
unit. Any system defi ciencies must be corrected prior to
installing the HWG module. Addition of the unit will not
correct system problems. Record the suction and discharge
pressures and compressor amperage draw. These will
be used for comparison with system operation after the
refrigerant line installation is complete and before the water
line installation is performed. Install the Add-On HWG kit
using the installation instructions below. Locate the HWG
as close to the water heater as possible. Unbraze the hot
gas u-bend as shown in Figure 19. Take care to avoid
overheating components. Install the dual 1/2" lineset to the
HWG. Maximum length should be 30 feet one way. Evacuate
R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 A

Outdoor Compressor Section Only

Table 7: HWG Module Lineset Sizing
the lineset to 500 microns through the hot gas valves in
the outdoor unit. Open the valves up fully (CCW looking up
from cap end). Check the lineset for leaks. Pinch the bypass
tubing as shown in Figure 19 being careful not to damage
the tubing. Verify that lineset tubing is completely insulated
with a minimum 1/2" thick closed cell and painted to prevent
deterioration of the insulation due to ultra violet light and
weather. Make the connections with high temperature solder
or brazing rod. The recommended line size is dependent on
the one way distance between the Heat Recovery Unit and
the compressor; and the size of the system. Use the Table 7
as a guideline.
Figure 19: HWG Connection Details
Capacity
2 Ton
3 Ton
4 Ton
5 Ton
As a guideline add 1.0 oz. of R-22 for the heat exchanger
plus 1.0 oz. for each 10 ft of 1/2" OD refrigerant line, if the
weighed charge method is used (28g for the heat exchanger
plus 9g per meter of 1/2" OD refrigerant line).
Hot Gas from
Compressor
C a r r i e r : Tu r n t o t h e E x p e r t s
Line Set Size
1/2" OD 5/8" OD
Up to 16 ft. Up to 30 ft.
[4.9m] [9.1m]
Up to 9 ft. Up to 25 ft.
[2.7m] [7.6m]
Up to 5 ft. Up to 13 ft.
[1.5m] [4.0m]
N/A Up to 9 ft.
[2.7m]
Unbraze u-tube
Pinch off here after evacuating
lineset and opening valves
Open Valves CW Close
valves CCW as looking up
from underneath
R e v. : 5 J u n e , 2 0 0 8
3/4" OD
N/A
Up to 30 ft.
[9.1m]
Up to 30 ft.
[9.1]
Up to 25 ft.
[7.6m]
Hot water generator
service valve assembly
(inside cabinet)
Hot Gas to
Reversing Valve
Field connection of
Hot Water lineset
25