Comfort-Aire AFM42-60 - Manual (Page 6)

6
Multi-Position Air Handler with Hydronic Heat with X13 Motor HWCGxxX0A Heat Controller
Counter Flow Installation
Fig.7. Air Handler parts and changes for Counter flow
• Before positioning the Air Handler in the counter
flow position, remove lower access panels, filter
panel and filter.
• Remove the A-Coil assembly with the horizontal
drain pan; discard the horizontal drain pan (not
required for counter flow application).
• Rotate the Air Handler 180° to the counter flow
position.
• Remove the coil deck and filter channel, rotate
the filter channels 180° and re-attach in the
same location they were removed from.
• Rotate the coil deck 180° and re-attach in the
holes near the center of the cabinet (screws not
provided).
• Slide the A-coil assembly into the cabinet on the
coil deck (without the horizontal drain pan).
Note: Push the coil pan assembly all the way to
the rear of the cabinet until it locks under the
bracket in the rear.
• Place the 3” x 16” counter flow plates at the
outside bottom of the coil as shown in FIG. 8.
• Replace the access panels and filter panel.
3" X 16" Metal Plate
Fig.8. Position of plates required in counter flow
Electrical Installation
These units are designed for single or three phase 120
volts, 60 Hz power supply. Wire selection and wiring
must be in accordance with the National Electric Code
(or CEC for Canadian Installations) and/or local codes.
Unit terminals are designed to accommodate copper and
aluminum wirings. If aluminum wiring is used; please
observe special precautions relative to sizing, wire
connections and corrosion protection.
Fig.9 shows the typical electrical connections reqruired
for A/C only and heat pump applications.
The unit ships with a micro-processor based board
which controls the electrical functining of the unit. An
inspection of the controls is recommended prior to start
up of the unit.
Fig.10 provides a schematic of the control board present
in the unit. The units ship from the factory with the
aquastat jumper in the OFF position (right two pins) and
the heating selector in the HW position (right two pins). If
an aquastat is used in the application; the jumper should
be changed to ON position (left two pins).
Note: Terminals T and N located on the top right side
of the board are not intended for field use and should be
left un-connected.
CAUTION
The aquastat (AQ) jumper must be
in the OFF position at all times; except when an aquastat
is used. If the jumper is moved to the ON position
without installing an aquastat the blower will not be
energized.
When an aquastat is present, the blower will be
energized at the aquastat temperature settings.
Fig 9. Electric connections
CAUTION
This model is shipped without
factory a installed pump, therefore the two black wires
should be connected to the boiler terminals T T. In
applications where a boiler provides the hot water