15
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
C o n s o l e s
R e v. : 5 N o v. , 2 0 0 9 B
c l i m a t e m a s t e r. c o m
Installation of Supply and Return Piping
Follow these piping guidelines.
1. Install a drain valve at the base of each supply and
return riser to facilitate system
fl
ushing.
2. Install shut-off / balancing valves and unions at each
unit to permit unit removal for servicing.
3. Place strainers at the inlet of each system
circulating pump.
4. Select the proper hose length to allow slack between
connection points. Hoses may vary in length by +2%
to -4% under pressure.
5. Refer to Table 1. Do not exceed the minimum bend
radius for the hose selected. Exceeding the minimum
bend radius may cause the hose to collapse, which
reduces water
fl
ow rate. Install an angle adapter to
avoid sharp bends in the hose when the radius falls
below the required minimum.
Insulation is not required on loop water piping except
where the piping runs through unheated areas, outside
the building or when the loop water temperature is
below the minimum expected dew point of the pipe
ambient conditions. Insulation is required if loop water
temperature drops below the dew point (insulation is
required for ground loop applications in most climates).
Pipe joint compound is not necessary when Te
fl
on®
thread tape is pre-applied to hose assemblies or when
fl
ared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on
the external pipe threads of the
fi
tting adapters. Prevent
sealant from reaching the
fl
ared surfaces of the joint.
Note: When anti-freeze is used in the loop, insure
that it is compatible with the Te
fl
on tape or pipe joint
compound that is applied.
Maximum allowable torque for brass
fi
ttings is 30 ft-lbs
[41 N-m]. If a torque wrench is not available, tighten
fi
nger-tight plus one quarter turn. Tighten steel
fi
ttings
as necessary.
Optional pressure-rated hose assemblies designed
speci
fi
cally for use with ClimateMaster units are available.
Similar hoses can be obtained from alternate suppliers.
Supply and return hoses are
fi
tted with swivel-joint
fi
ttings at one end to prevent kinking during installation.
Refer to Figure 2 for an illustration of a typical supply/
return hose kit. Adapters secure hose assemblies to
the unit and risers. Install hose assemblies properly and
check regularly to avoid system failure and reduced
service life.
Table 1: Metal Hose Minimum Bend Radii
Hose Diameter
Minimum Bend Radii
1/2" [12.7mm]
2-1/2" [6.4cm]
3/4" [19.1mm]
4" [10.2cm]
1" [25.4mm]
5-1/2" [14cm]
1-1/4" [31.8mm]
6-3/4" [17.1cm]
NOTICE!
Do not allow hoses to rest against structural
building components. Compressor vibration may be
transmitted through the hoses to the structure, causing
unnecessary noise complaints.
Figure 2: Supply/Return Hose Kit
Rib Crimped
Length
(2 ft [0.6m] Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
EPT
CAUTION!
CAUTION!
CAUTION!
Many units are installed with a factory or
fi
eld
supplied manual or electric shut-off valve.
DAMAGE WILL
OCCUR
if shut-off valve is
closed
during unit operation. A
high pressure switch must be installed on the heat pump side
of any
fi
eld provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The
fi
eld installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from ClimateMaster with a 1/4” internal
fl
are
connection as part number 39B0005N02.
Piping Connections
CAUTION!
Do not bend or kink supply lines or hoses.
