1
CAUTION!
Corrosive system water requires
corrosion resistant fittings and hoses, and
may require water treatment.
PIPING INSTALLATION
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 flushing.
. Install shut-off / balancing valves and unions at each
unit to permit unit removal for servicing.
. 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 +%
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 flow 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 Teflon®
thread tape is pre-applied to hose assemblies or when
flared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on
the external pipe threads of the fitting adapters. Prevent
sealant from reaching the flared surfaces of the joint.
Note: When anti-freeze is used in the loop, insure that it
is compatible with the Teflon tape or pipe joint compound
that is applied.
Maximum allowable torque for brass fittings is 0 ft-lbs
[41 N-m]. If a torque wrench is not available, tighten
finger-tight plus one quarter turn. Tighten steel fittings
as necessary.
Optional pressure-rated hose assemblies designed
specifically for use with Heat Controller units are available.
Similar hoses can be obtained from alternate suppliers.
Supply and return hoses are fitted with swivel-joint fittings
at one end to prevent kinking during installation.
Refer to Figure 11 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.
A backup wrench is required when tightening water
connections to prevent water line damage.
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]
CAUTION!
Do not bend or kink supply lines
or hoses.
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.
CAUTION!
Piping must comply with all
applicable codes.
Figure 11: Supply/Return Hose Kit
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