Installation
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9
LV Heat Pump Series
8 733 905 683 (2013/04)
LV Heat Pump Series
if the unit will be installed in a new installation with
new duct work, the installation should be designed
using current ASHRAE procedures for duct sizing.
If the unit will be connected to an existing duct
system, a check should be made to assure that the
duct system has the capacity to handle the air
required for the unit application. If the duct system
is too small, larger duct work must be installed. Be
certain to check for existing leaks and repair.
The duct system and all diffusers should be sized
to handle the designed air flow quietly. To
maximize sound attenuation of the unit blower, the
supply and return air plenums should be insulated.
There should be no direct straight air path
throught the air grill into the heat pump. The return
air inlet to the heat pump must have at least one 90
degree turn away from the space return air grill. If
air noise or excessive air flow are a problem, the
blower speed can be changed to a lower speed to
reduce air flow.
Piping
Supply and return piping must be as large as the
unit connections on the heat pump (larger on long
runs). Never use flexible hoses of a smaller inside
diameter than that of the water connections on the
unit. LV Units are supplied with either a copper or
optional cupro-nickel condenser. Copper is
adequate for ground water that is not high in
mineral content. Refer to Table #1.
In conditions anticipating moderate scale
formation or in brackish water a cupro-nickel heat
exchanger is recommended. Both the supply and
discharge water lines will sweat if subjected to low
water temperature. These lines should be
insulated to prevent damage from condensation.
All manual flow valves used in the system must be
ball valves. Globe and gate valves must not be used
due to high pressure drop and poor throttling
characteristics. Always check carefully for water
leaks and repair appropriately. Units are equipped
with female pipe thread fittings. Consult the
specification sheets for sizes.
Teflon tape sealer should be used when
connecting water piping connections to the units
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 the supply and return lines for system flow
balancing. The water flow can be accurately set by
measuring the water-to- refrigerant heat
exchangers water side pressure drop. See the unit
specification sheets for the water flow and
pressure drop information.
Electrical - High Voltage
All field installed wiring must comply with the
National Electric Code as well as all applicable
local codes. Refer to the unit electrical data on the
unit name plate for wire and branch circuit
protection sizing. Supply power voltage and
phasing should match the required voltage and
phasing shown on the unit name plate. Operating
the unit below the minimum voltage, above the
maximum voltage or with incorrect phasing can
result in poor system performance or damage to
the heat pump. All field wiring should be installed
by qualified and trained personnel. Refer to the
unit wiring diagram for field connection
requirements.
Power wiring to the heat pump should be enclosed
in flexible conduit to minimize the transmission of
vibration from the unit cabinet to the building.
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. (Refer to Table #1)
Water piping exposed to extreme, low
ambient temperatures is subject to freezing
Never exceed the recommended water flow
rates. Serious damage or erosion of the
water to refrigerant heat exchanger could
occur.
All power connections must be properly
torque to avoid the risk of overheating.
