Instruction manual

G. INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
CAUTION: For heating and cooling operation, the rec-
ommended airflow is 350 to 450 cfm for each 12,000
Btuh of rated cooling capacity. For units with optional
electric heat, the airflow must not be reduced below the
levels stated in Tables 3 and 4. Failure to maintain these
airflows could result in damage to the unit.
Tables 7 and 8 shows both heating and cooling airflows at various
external static pressures. Refer to these tables to determine the
airflow for the system being installed.
NOTE: Be sure that all supply-and return-air grilles are open, free
from obstructions, and adjusted properly.
Airflow can be changed by changing the lead connection of the
blower motor.
Unit 601A and 602A three-speed motors (except sizes 601A 018
and 602A 030) are factory wired for low speed operation. Unit
602A 030 is factory wired for medium speed. Unit 601A 018 has
a two-speed motor wired for low speed.
For 208/230-v Motors:— The motor leads are color-coded as
follows:
3-SPEED
Black = high speed
Blue = medium speed
Red = low speed
To change the speed of the indoor fan motor (IFM), remove the fan
motor speed leg lead from the Time Delay Relay (TDR). This wire
is attached to TDR-3 for single-phase and 3-phase units. To change
the speed, remove and replace with lead for desired blower motor
speed. Insulate the removed lead to avoid contact with chassis
parts.
For 460-v GE Motors—The motor leads are color coded as
follows:
3-SPEED
Black = high
Violet = jumper
Orange = medium
Red = low
Fig. 22—Typical Heat Pump Operation, Heating Mode
C00095
COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering Device
Arrow indicates direction of flow
Bypass
Position
Metering
Position
HPS
Fig. 23—Typical Heat Pump Operation, Cooling Mode
C00096
COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering Device
Arrow indicates direction of flow
Metering
Position
Bypass
Position
HPS
—18—