Installation
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7
Revised 08/14
8 733 914 818 (2014/08)
SV Heat Pump Series
For open loop systems, water quality is very
important. Table #1 shows acceptable ranges for a
variety of water quality factors. The three main
concerns in open loop installations are scaling,
corrosion and fouling.
In installations with hard water, scaling due to a
buildup of carbonates on the heat exchanger wall
can gradually degrade the heat pump performance
over time. Heat pumps that are affected by scaling
may exhibit low suction pressures in heating and
high head pressures in cooling with a gradual loss
of capacity and efficiency. Scaled heat exchangers
can be cleaned by a qualified technician but care
should be taken to avoid scaling in the first place.
To limit scaling, water flow rates should be kept at
3 gallons/minute per nominal cooling ton (a 10°F
temperature rise in cooling) and care should be
taken to avoid air in the water lines from suction
side leaks. Cupro-nickel coils are generally
recommended.
In installations with high hydrogen sulfide, chlorine
or ammonia, corrosion is a potential problem. In
these installations a cupro-nickel heat exchanger is
recommended along with maintaining proper flow
and keeping air out of the system. If water quality
is outside of the values in Table #1, then a closed
loop is recommended.
Fouling due to iron bacteria can also pose
problems in some open loop installations. Iron
bacteria fouling can quickly degrade system
performance and plug heat exchangers.
Air in the water system will greatly accelerate the
fouling or corrosion process.
INSTALLATION
The following are instructions to follow for
installation of all SV Series components.
Duct Flanges
SV heat pumps feature fold-out return and supply
air duct flanges. These fold-out flanges allow the
heat pumps to more easily fit through doorways
and other tight spaces, and also prevent damage in
shipping and handling.
It is recommended that all fold-out flanges be
folded-out once the heat pump is installed to
insure that return and supply air flow is not
obstructed. These flanges can be easily folded
using standard or duckbill pliers. Once folded out
these flanges can be used to support light duct
work loads.
Mounting Vertical Units
SV Series vertical and counter flow units should be
mounted level on a vibration absorbing pad slightly
larger than the unit base in order to minimize
vibration transmission from the unit to the building
structure. See Figure #1. It is generally not
necessary to anchor the unit unless required by
local code.
All major service access for the SV Series vertical
and counter flow models is from the front side of
the unit. When installing the unit in a confined
space such as a closet, insure that the service
panel screws are accessible, that the filter can be
replaced without damage and that water and
electrical connections are accessible. For models
with a unit mounted disconnect switch, make sure
the switch can be easily seen and operated.
To reduce sound transmission, units should be
installed using flexible electrical conduit and hose
kits. Care should be taken to insure that no part of
the unit cabinet is touching part of the building
structure. For ducted return applications, a
flexible duct connection should be used. Refer to
Figure’s #14, #15 and #13.
Figure # 1 Mounting Vertical Units
Mounting Horizontal Units
While horizontal units may be installed on any level
surface strong enough to hold their weight, they
are typically suspended above a ceiling by
threaded rods. The rods are usually attached to the
unit corners by hanger bracket kits (P/N 930-008).
Vibration
Mounting
Pad
