Comfort-Aire TGRG Series for R-410A - Manual (Page 30)

3. If the coil is coated with oil or grease, clean it with a mild detergent-and-water solu-
tion. Rinse the coil thoroughly with water. IMPORTANT: Do not use excessive water
pressure. Excessive water pressure can bend the fins and tubing of the coil and lead
to inadequate unit performance. Be careful not to splash water excessively into unit.
4. Inspect the drain pan and condensate drain at the same time the condenser coil is
checked. Clean the drain pan by flushing with water and removing any matters of
obstructions which may be present.
5. Flush the drain tube with water. If the drain tube is blocked, it can usually be cleared
wth high pressure water.
6. Inspect the circulating air blower wheel and motor for accumulation of lint, dirt or
other obstruction and clean if necessary. Inspect the blower motor mounts and the
blower housing for loose mounts or other damage. Repair or replace if necessary.
Re-assembly
1. Place the condenser coil protective grille back on unit and replace all screws.
2. Place top panel back on unit and replace all screws.
3. Set condenser fan grille assembly on top of the unit with the fan on top and the
motor wires on the venturi side. Run the fan motor wires through the bulkhead and
pull wires through the hole on the bottom of the control box on the left side and into
the control box. Reconnect fan motor wires per the wiring diagram attached to the
back of the control box cover.
4. Replace wire strain relief in bulkhead after the slack is pulled out of the wires on the
fan side. This will assure wires will not be damaged by the fan during unit operation.
5. Turn the condenser fan grille assembly over and into the recess in the unit top.
Secure the grille to the unit with the four screws removed earlier.
6. Replace the circulating air blower, making sure that all wires are properly reconnect-
ed per the unit wiring diagram.
7. Replace the filter and blower/evaporator coil access panels.
8. Replace the control box cover and controls access panel.
9. Restore electrical power to the unit and check for proper operation, especially the
condenser fan motor.
E. REPLACEMENT PARTS
Contact your local distributor for a complete parts list.
F. CHARGING
Refer to the appropriate charge chart included in this manual.
G. TGRG**C/TGRG**D/TGRG**E BLOWER MOTOR SPEED ADJUSTMENTS
Note: These instructions to be used in conjunction with airflow data tables.
After determining necessary CFM and speed tap, follow the steps below to change
speeds.
Units with PSC Blower Motors:
1. Remove the furnace/control access panel.
2. Remove the control box cover. See Figure 22 for location of the furnace control
board.
3. Reference Figure 23 for the proper location of the wires on the speed tap block and
on the furnace control board to obtain the speed tap you have chosen.
Note: 460V units have dedicated heating and cooling speeds and should not be
adjusted.
4. After adjusting the wires accordingly, attach the control box cover, furnace control
access panel and the blower access panel to the unit.
Units with X-13 Motors
1. Remove blower access panel.
2. Locate wire terminals on the motor. Numbered terminals are 24V blower taps (See
airflow tables for corresponding speed). The C terminal is 24V common. L, N, and G
terminals are high voltage and must remain unchanged.
! WARNING
DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPT-
ING TO CHANGE BLOWER SPEEDS. FAILURE TO DO SO MAY RESULT IN
ELECTRICAL SHOCK OR SEVERE PERSONAL INJURY OR DEATH.
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