Comfort-Aire HWW120 - Manual (Page 8)

7
Installation & Operation WATER-TO-WATER (HWW) SERIES Heat Controller, Inc.
Unit Installation
HWW Unit Location
These units are not designed for outdoor installation. Locate
the unit in an INDOOR area that allows enough space for ser-
vice personnel to perform typical maintenance or repairs.
The installation of water source heat pump units and all as-
sociated components, parts and accessories which make up
the installation shall be in accordance with the regulations of
ALL authorities having jurisdiction and MUST conform to all
applicable codes. It is the responsibility of the Installing Con-
tractor to determine and comply with ALL applicable codes and
regulations.
Locate the unit in an indoor area that allows easy removal of
access panels, and has enough space for service personnel
to perform maintenance or repair. Provide sufficient room to
make water and electrical connections.. Any access panel
screws that would be difficult to remove after the unit is in-
stalled should be removed prior to setting the unit. These units
are not approved for outdoor installation and, therefore, must
be installed inside the structure being conditioned. Do not
locate in areas where ambient conditions are not maintained
within 40-100°F [4-38°C].
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. 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 and
causes a slight kink.
Insulation is not required on loop water piping except where
the piping runs through unheated areas or outside the build-
ing or when the loop water temperature is below the minimum
expected dew point of the pipe ambient temperature. Insula-
tion is required if loop water temperature drops below the dew
point.
Pipe joint compound is not necessary when Teflon threaded
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 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, assure that it is
compatible with Teflon tape or pipe joint
compound employed.
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.
Piping Installation
� WARNING! �
� WARNING! �
Piping must comply with all applicable codes.
Do not bend or kink supply lines or hoses.
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 1 for an illustration of a Supply/Return Hose
Kit. Male adapters secure hose assemblies to the unit and ris-
ers. Install hose assemblies properly and check them regularly
to avoid system failure and reduced service life.
� CAUTION! �
Corrosive system water requires corrosion resistant fittings
and hoses and possibly water treatment.
Figure 1: Supply/Return Hose Kit
Rib Crimped
Length
(2 ft [0.6m] Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
EPT
Reborde Acanalado
Longitud
(Long. Estándar de 2 pies)
Accesorio
Giratorio
de Bronce
Accesorio
de Bronce
MPT
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only !
Do Not
Overtighten!