Comfort-Aire HBH Series 6-10 Tons - Manual (Page 12)

IOM Manual HBH SERIES Heat Controller, Inc.
11
If the unit is connected to existing ductwork, a previous
check should have been made to ensure that the ductwork
has the capacity to handle the airflow required for the unit.
If ducting is too small, as in the replacement of a heating
only system, larger ductwork should be installed. All existing
ductwork should be checked for leaks and repaired as
necessary.
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.
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 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 30 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 7 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.
Piping Installation
CAUTION! Corrosive system water requires corrosion
resistant fittings and hoses, and may require water
treatment.
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]
1-1/2" [38.1 mm] 8.5" [216mm]
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.
Figure 7: Supply/Return Hose Kit
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Rib Crimped
Length
(2 ft [0.6m] Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
MPT
Reborde Acanalado
Longitud
(Long. Est‡ndar de 2 pies)
Accesorio
Giratorio
de Bronce
Accesorio
de Bronce
MPT
CAUTION! Piping must comply with all applicable codes.
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