Comfort-Aire AFM42-60 - Manual (Page 3)

3
Heat Controller Multi-Position Air Handler with Hydronic Heat with X13 Motor HWCGxxX0A
Ductwork
Duct systems should be installed in accordance with
standards for air-conditioning systems, National Fire
Protection Association Pamphlet No. 90A or 90B. They
should be sized in accordance with National
Environmental System Contractors Association Manual
K, or whichever is applicable.
On any job, non-flammable flexible collars should be
used for the return air and discharge connections to
prevent transmission of vibration. Although these units
have been specially designed for quiet vibration-free
operation, air ducts can act as soundboards can, if
poorly installed, amplify the slightest vibration to the
annoyance level.
All main supply and return air drops should be properly
sized as determined by the designer of the duct system
and should not necessarily be the size of the duct flange
openings of the unit.
When installing a central air return grille in or near the
living space, it is advisable to design the ductwork so
that the grille is not in direct line with the opening in the
unit. One or two elbows and acoustical duct liner will
also assure a quieter installation and system.
It is recommended that wherever supply and return air
sheet metal ducts pass through unconditioned areas,
they be insulated to prevent excessive heat loss during
heating operation. When applied in conjunction with
summer air conditioning, sheet metal duct routed
through unconditioned areas should be insulated and
have an outside vapor barrier to prevent formation of
condensation.
Installation
CAUTION
Ensure that the unit is adequately
sized. The tonnage of the outdoor unit should never
exceed the tonnage of this unit.
WARNING
The coil was manufactured with a
dry nitrogen pre-charge. Release the pressure through
the Schrader valve test port prior to installation. If
holding pressure is not present, return coil to distributor
for exchange.
Clean coil fins with degreasing agent or mild detergent
and rinse fins clean prior to installation.
All connection joints should be burr-free and clean. Not
removing the burr and cleaning may increase the chance
of a leak. It is recommended to use a pipe cutter to
remove any spun closed ends.
To avoid damage to grommets (where present), remove
these prior to brazing by sliding over the lines. Use a
quenching cloth or allow the lines to cool before
reinstalling the grommets.
WARNING
Prior to connecting the water
(hydronic) coil, make sure that the hot water supply is
turned off. Water from the heater could be extremely hot
and may result in burns and other personal injury along
with equipment damage. Ensure that proper safety gear
is being used prior to making connections.
CAUTION
Only lead free solder should be
used to connect water (hydronic) coil to the hot water
source.
CAUTION
Some coils may include a
Schrader valve on the suction manifold. Ensure that the
Schrader valve and valve core (where present) are
protected from heat to prevent leakage.
Metering Device
Coils use a TXV metering device. Instructions below are
for the metering device. Ensure that the instructions are
thoroughly read and understood.
TXV Coils:
WARNING
The sensing bulb and TXV body
MUST be protected from overheating during brazing.
The sensing bulb and TXV body must be covered using
a quench cloth or wet cloth when brazing. Pointing the
brazing flame away from the valve and sensing bulb
provide partial protection only.
CAUTION
Ensure that the TXV selected is
compatible with the refrigerant used in the outdoor
system (R22 or R410A). TXV caps are painted green for
R22 or pink for R410A. In absence of color, the caps will
be marked with the compatible refrigerant.
CAUTION
The valves should be sized
according to the capacity of the outdoor unit. Failure to
install the right valve can lead to poor performance and
possible compressor damage.
TXV Bulb Mounting
The orientation and location of the TXV bulb has a major
influence on the system performance.
CAUTION
Ensure that the TXV bulb is in
direct contact with the suction/vapor line. Gaps between
the bulb and tube should be avoided. Failure to eliminate
gaps will impair the proper functioning of the valve.
It is recommended that the TXV bulb be installed parallel
to the ground (in a horizontal plane). The bulb position
should be above and between 4 o’clock and 8 o’clock.