970-292 Revised 5-12
W
ELL WATER SYSTEMS:
(Figure #10)
C
opper is adequate for ground water that is not high in
mineral content. Should your well driller express concern
regarding the quality of the well water available or should
any known hazards exist in your area, we recommend
proper testing to assure the well water quality is suitable
for use with water source equipment. In conditions
anticipating moderate scale formation or in brackish water
a cupro-nickel heat exchanger is recommended. In well
water applications water pressure must always be
maintained in the heat exchanger. This can be
accomplished with either control valve or a bladder type
expansion tank. When using a single water well to supply
both domestic water and the heat pump care must be
taken to insure that the well can provide sufficient flow for
both. In well water applications a slow closing solenoid
valve must be used to prevent water hammer.
Solenoid valves should be connected across Y1 and C1 on
the interface board for all. Make sure that the VA draw of
the valve does not exceed the contact rating of the
thermostat.
INSTALLATION OF PRESSURE
REGULATING VALVES:
Pressure regulating valves are used to increase or
decrease water flow through the heat pump in response
to refrigerant pressure. In some cases more water may be
required in heating than in cooling, or vice versa. With the
Aquarius II heat pumps these valves are not required.
However, if installed, a pair of valves are required for
proper operation, one valve for cooling (direct acting) and
another valve for heating (indirect acting). A refrigerant
tap is provided in the refrigerant line located between the
reversing valve and the water-to-refrigerant heat
exchanger for proper monitoring of the refrigerant
pressures.
The discharge water from the heat pump is not
contaminated in any manner and can be disposed of in
various ways depending on local building codes (i.e.
discharge well, dry well, storm sewer, drain field, stream or
pond, etc.) Most local codes forbid the use of a sanitary
sewer for disposal. Consult your local building and zoning
department to insure compliance in your area.
COOLING TOWER/BOILER SYSTEMS:
(Figure #11)
The cooling tower and boiler water loop temperature is
usually maintained between 50˚ F to 100 ˚ F to assure
adequate cooling and heating performance.
In the cooling mode, heat is rejected from the FHP unit
into the water loop. A cooling tower provides evaporative
cooling to the loop water thus maintaining a constant
supply temperature to the unit. When utilizing open
cooling towers, chemical water treatment is mandatory to
ensure the water is free from corrosive elements. A
secondary heat exchanger (plate frame) between the unit
and the open cooling tower may also be used. It is
imperative that all air be eliminated from the closed loop
side of the heat exchanger to insure against fouling.
In the heating mode, heat is absorbed from the water
l
oop. A boiler can be utilized to maintain the loop at the
desired temperature.
CAUTION: Water piping exposed to extreme low ambient
temperatures is subject to freezing.
Consult the specification sheets for piping sizes. Teflon tape
sealer should be used when connecting to the unit to insure
against leaks and possible heat exchanger fouling. Do not
overtighten the connections. Flexible hoses should be used
between the unit and the rigid system to avoid possible
vibration. Ball valves should be installed in the supply and
return lines for unit isolation and unit water flow balancing.
Pressure/temperature ports are recommended in both
supply and return lines for system flow balancing. Water
flow can be accurately set by measuring the water-to-
refrigerant heat exchangers water side pressure drop. See
specification sheets for water flow vs. pressure drop
information.
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.
EARTH COUPLED SYSTEMS:
(Figure #12)
Closed loop and pond applications require specialized
design knowledge. No attempt at these installations
should be made unless the dealer has received specialized
training. Utilizing FHP’s Ground Loop Pumping Package
(GLP), makes the installation easy. Anti-freeze solutions
are utilized when low evaporating conditions are
expected to occur. Refer to the GLP installation manuals
for more specific instructions.
SYSTEM CHECKOUT:
• After completing the installation, and before
energizing the unit, the following system checks
should be made:
• Verify that the supply voltage to the heat pump is in
accordance with the nameplate ratings.
• Make sure that all electrical connections are tight and
secure.
• Check the electrical fusing and wiring for the correct
size.
• Verify that the low voltage wiring between the
thermostat and the unit is correct.
• Verify that the water piping is complete and correct.
• Check that the water flow is correct, and adjust if
necessary.
• Check the blower for free rotation, and that it is
secured to the shaft.
• Verify that vibration isolation has been provided.
• Unit is serviceable. Be certain that all access panels are
10
AP SERIES
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