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WATER SUPPLY AND QUALITY
Check water supply. Water supply should be plentiful and of good
quality. See Table 3 for water quality guidelines.
IMPORTANT: Failure to comply with the above required
water quality and quantity limitations and the closed-system
application design requirements may cause damage to the
tube-in-tube heat exchanger that is not the responsibility of the
manufacturer.
In all applications, the quality of the water circulated through the
heat exchanger must fall within the ranges listed in the Water
Quality Guidelines table. Consult a local water treatment firm,
independent testing facility, or local water authority for specific
recommendations to maintain water quality within the published
limits.
INSTALLATION OF HOT WATER GENERATOR OPTION
(ONLY 025-71 SIZES)
The hot water generator (HWG) or Heat recovery package (HRP)
is a factory-installed option capable of providing hot water in the
range of 110 to 140°F as a supplemental domestic hot water
source. The HWG is a desuperheater that uses recovered heat
from the hot discharge gas leaving the compressor. Included with
the HWG is a vented, double wall coil, circulating pump, high wa-
ter temperature limit switch (set at 140°F), discharge gas tempera-
ture limit switch, and an ON/OFF switch with built-in circuit
breaker. The generator operates independently and is not factory
wired to the unit controller.
NOTE: The HWG will reduce the amount of heat available to the
load side and it is recommended to deactivate the HWG in heating
mode via the ON/OFF switch.
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 outdoors 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 HWG water piping. All hot water piping should be a
minimum of 3/8 in. OD copper tube to a maximum distance
of fifteen feet. For distances beyond fifteen feet but not
exceeding sixty feet use 1/2 in. copper tube. Separately insu-
late all exposed surface of both connecting water lines with
3/8 in. wall closed cell insulation. Install isolation valves on
supply and return to the hot water generator. See Fig. 5.
NOTE: Diagram is for illustration purposes only. Ensure access to
heat pump is not restricted. All plumbing and piping connections
must comply with local plumbing codes.
TYPICAL HOT WATER GENERATOR INSTALLATION
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 HWG by depressing the Schrader valve on
the HR unit. Allow all air to bleed out until water appears at
the 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 refrig-
eration system and to conserve the most energy. On tanks
with thermostats and both upper and lower elements, the
lower element should be turned down to 100°F, while the
upper element should be adjusted to 120°F. Depending 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.
Initial Start-Up
1.
Turn on the heat pump. The circulating pump should not run
if the compressor is not running.
2.
Turn HWG switch to the "ON" position. The pump will oper-
ate if entering water temperature to HWG is below 120°F.
3.
Ensure the temperature difference between the water entering
and leaving the heat recovery is 5 to 15°F.
4.
Allow the unit to operate for 20 to 30 minutes to ensure it is
functioning properly. The pump should shut off when the
water temperature entering the generator reaches 120°F.
COOLING TOWER/BOILER APPLICATION
To assure adequate cooling and heating performance, the cooling
tower and boiler fluid loop temperature should be maintained be-
tween 50°F and 100°F. In the cooling mode, heat is rejected from
the unit into the condenser water loop. A cooling tower provides
evaporative cooling to the loop water; thus, maintaining a constant
supply temperature to the unit. When utilizing an open cooling
tower, chemical water treatment is mandatory to ensure the water
is free of corrosive materials. A secondary heat exchanger (plate
frame between the unit and the open cooling tower) may also be
used. It is imperative that all air is eliminated from the closed loop
side of the heat exchanger to prevent condenser fouling.
(See Fig. 6.)
In the heating mode, heat is absorbed from the condenser water
loop to the unit. A boiler can be utilized to maintain the loop
within the proper temperature range. In milder climates a "flooded
tower" concept is often used. This concept involves adding
make-up water to the cooling tower sump to maintain the desired
loop temperature. No unit should be connected to the supply or
return piping until the water system has been completely cleaned
and flushed to remove any dirt, piping chips or other foreign
material. Supply and return hoses should be connected together
during this process to ensure the entire system is properly flushed.
After the cleaning and flushing has taken place, the unit may be
connected to the water loop and should have all valves wide open.
Pressure/temperature ports are recommended in both the supply
and return lines for system flow balancing. Water flow can be
accurately set by measuring the refrigerant-to-water heat
exchangers water side pressure drop.
WELL WATER SYSTEMS
Water quantity should be plentiful, between 1.5 and 2.5 gpm
per ton of cooling, and of good quality. To avoid the possibility
of freezing the well water should be above 50°F.
Water pressure must always be maintained in the heat ex-
changer by placing a water control valve on the outlet of the
water-to-water unit. A bladder type expansion tank may be
used to maintain pressure on the system.
8
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