Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual page 22

Warning! The HWG pump Is fully wired from the
factory. Use extreme caution when working around
the microprocessor control as it contains line voltage
connections that presents a shock hazard that can
cause severe injury or death!
The heat pump, water piping, pump, and hot water tank
should be located where the ambient temperature does
not fall below 50°F [10°C]. Keep water piping lengths at a
minimum. DO NOT use a one way length greater than 50
ft. (one way) [15 m]. See Table 7 for recommended piping
sizes and maximum lengths.
All installations must be in accordance with local
codes. The installer is responsible for knowing the
local requirements, and for performing the installation
accordingly. DO NOT connect the pump wiring until "Initial
Start-Up" section, below. Powering the pump before all
installation steps are completed may damage the pump.
Water Tank Preparation
1. Turn off power or fuel supply to the hot water tank.
2. Connect a hose to the drain valve on the water
tank.
3. Shut off the cold water supply to the water tank.
4. Open the drain valve and open the pressure relief
valve or a hot water faucet to drain tank.
5. When using an existing tank, it should be flushed
with cold water after it is drained until the water
leaving the drain hose is clear and free of sediment.
6. Close all valves and remove the drain hose.
7. Install HWG water piping.
HWG Water Piping
1. Using at least 5/8" [16mm] O.D. copper, route and
install the water piping, valves and air vent as
shown in Figures 14 or 15. Install an approved anti-
scald valve if the 150°F HWG setpoint is or will be
selected. An appropriate method must be employed
to purge air from the HWG piping. This may be
accomplished by flushing water through the HWG
(as In Figures 14 and 15) or by Installing an air vent
at the high point of the HWG piping system.
2. Insulate all HWG water piping with no less than 3/8"
[10mm] wall closed cell insulation.
3. Open both shut off valves and make sure the tank
drain valve is closed.
Water Tank Refill
1. Close valve #4. Ensure that the HWG valves
(valves #2 and #3) are open. Open the cold water
supply (valve #1) to fill the tank through the HWG
HTV/HTD/HTH SERIES
2.
3.
4.
5.
6.
Initial Start-Up
1.
2.
3.
4.
5.
6.
Table 7: HWG Water Piping Sizes and Length
Unit
Nominal
Tonnage
1.5
2.0
2.5
3.0
3.5
4.0
5.0
6.0
*Maximum length is equivalent length to one way of L copper.
21
piping. This will purge air from the HWG piping.
Open a hot water faucet to vent air from the system
until water flows from faucet; turn off faucet. Open
valve #4.
Depress the hot water tank pressure relief valve
handle to ensure that there is no air remaining in
the tank.
Inspect all work for leaks.
Before restoring power or fuel supply to the water
heater, adjust the temperature setting on the tank
thermostat(s) to insure maximum utilization of the heat
available from the refrigeration system and conserve
the most energy. On tanks with both upper and lower
elements and thermostats, the lower element should
be turned down to 100°F [38°C] or the lowest setting;
the upper element should be adjusted to 120-130°F
[49-54°C]. Depending upon the specific needs of the
customer, you may want to adjust the upper element
differently. On tanks with a single thermostat, a preheat
tank should be used (Fig 15).
Replace access cover(s) and restore power or
fuel supply.
Make sure all valves in the HWG water circuit are
fully open.
Turn on the heat pump and allow it to run for
10-15 minutes.
Set SW12 to the "OFF" position (enabled) to
engage the HWG.
The HWG pump should not run if the compressor is
not running.
The temperature difference between the water
entering and leaving the HWG coil should be
approximately 5-10°F [3-6°C].
Allow the unit to operate for 20 to 30 minutes to
insure that it is functioning properly.
Nominal
1/2" Copper (max
HWG Flow
length*)
(gpm)
0.6
0.8
1.0
1.2
1.4
1.6
2.0
2.4
Heat Controller, Inc.
3/4" Copper
(max length*)
50 -
50 -
50 -
50 -
50 -
45 50
25 50
10 50