Unit Installation
The duct system and all diffusers must be sized to handle the
designed air flow quietly. To maximize sound attenuation of the
unit’s blower, insulate the supply and return air plenums. There
should be no direct straight air path through the return air grille
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.
5.9 Piping
Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs).
In order to avoid possible vibration, use flexible hose between
the unit an
d the rigid system.
NOTICE
Never use flexible hoses of a smaller inside diameter than that
of the water connections on the unit.
Units are equipped with female pipe thread fittings for water
connections.
NOTICE
Piping systems that contains steel pipes or fittings may be
subject to galvanic corrosion. Dielectric fittings should be
used to isolate the steel parts of the system to avoid galvanic
corrosion.
NOTICE
DO NOT overtighten the connections to avoid damage to
threads.
Install ball valves in the supply and return lines for unit isolation
and unit water flow balancing and service.
CF units are supplied with a copper or optional cupro-nickel
condens
er. A cupro-nickel heat exchanger is recommended for
the following:
• Conditions anticipating moderate scale formation
• Brackish water
• Ground Loop application
• Ground water application
(Refer to the Water Qua
lity Table on page #28.) Water quality
must meet the standards stated in the table.
NOTICE
Proper testing is required to ensure the well water quality is
suitable for use with water source equipment.
Both the supply and discharge water lines will sweat if subjected
to low water temperature. Insulate lines to prevent damage from
condensation.
All manual flow valves used in the system must be quarter-turn
brass fu
ll-port ball valves. Globe and gate valves must not be
used due to high-pressure drops and poor throttling
characteristics.
Pressure/temperature ports are recommended in both the
supply an
d return lines for system flow balancing and
determining the system capacity versus rated conditions. 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. (Refer to the Water-Side
Pressure Drop Table on
page #74.)
NOTICE
DO NOT expose water piping to freezing ambient
temperatures unless the fluid is properly protected with
antifreeze.
NOTICE
Never exceed the recommended water flow rates as serious
damage or erosion of the water-to-refrigerant heat exchanger
could occur.
Always check carefully for water leaks and repair appropriately.
5.9.1 Flow Regulation
Flow regulation can be accomplished by two methods. Most
water con
trol valves have a flow adjustment built into the valve.
By measuring the pressure drop through the unit heat exchanger,
the flow rate can be determined. Adjust the water control valve
until the desired flow is achieved. Since the pressure constantly
varies, two pressure gauges may be needed in some
applications.
An alternative method is to install a flow-control device. These
devices a
re typically an orifice of plastic material designed to
allow a specified flow rate that are mounted on the outlet of the
water control valve. Occasionally these valves produce a flow
noise that can be reduced by applying some back pressure. To
accomplish this, slightly close the leaving isolation valve.
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CF Series Heat Pumps — 8733846299 (2024/11)
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