Table of Contents
Advertisement
The blower speed for 3 and 4 ton units is preset at the
factory for operation at the same speed for heating and
cooling. These factory settings are listed in Table 5
(page 16).For optimum system performance and comfort,
it may be necessary to change the factory set speed.
PSC Motor - 208/230V
1. Shut off all electrical power to the unit and remove
the service panel.
2. Remove the motor lead from terminal #4 of the blower
relay. Cut the wire tie from the lead bundle. The
motor leads are color coded as shown in Figure 7.
3. If the desired heating blower speed is different than
the cooling speed, remove and discard the jumper
wire between terminals #6 & #4 on the blower relay.
Place the desired heating blower speed lead on
terminal #6 and the desired cooling blower speed
lead on terminal #4 of the blower relay. Bundle the
remaining motor leads together with a fi eld supplied
wire tie.
RED
1
2
BLUE
3
4
BLACK
5
6
WHITE
Figure 7. Motor Lead Connector -
PSC Motor - 208/230V
PSC Motor - 460V
NOTE: Unit is preset for low speed (red wire).
1. Shut off all electrical power to the unit and remove
the service panel.
2. Low speed: Connect the black and orange wires
together via the terminal block.
Medium speed: Remove the red wire from terminal
3 on the relay and replace it with the blue wire. Motor
leads are code Q in Figure 8.
High speed: Connect the black wire to terminal 3
on the relay. Tie off the orange, red, and blue wires.
They are not connected for high speed.
RED
1
2
ORANGE
BLUE
3
BLACK
4
5
6
WHITE
Figure 8. Motor Lead Connector -
PSC Motor - 460V
PIN NUMBER
WIRE COLOR
MOTOR SPEED
1
RED
LOW
2
3
BLUE
MEDIUM
4
BLACK
HIGH
5
N/A
N/A
6
WHITE
COMMON
PIN NUMBER
WIRE COLOR
MOTOR SPEED
1
RED
LOW
ORANGE
2
FOR LOW SPEEDS*
3
BLUE
MEDIUM
4
BLACK
HIGH
5
N/A
N/A
6
WHITE
COMMON
Fixed Torque ECM Motor
1. Shut off all electrical power to the unit and remove
the blower panel. Locate the orange and red wires
terminated to the blower motor. NOTE: The orange
wire controls cooling operation while the red wire
controls heating operation.
2. Verify the required speed from the airfl ow data found
in Table 5. Place appropriate wire on the correct motor
speed tap for the required airfl ow point.
Optional Outdoor Thermostat
An outdoor thermostat can be installed in the fi eld with
2-stage electric heat. To install the outdoor thermostat,
remove the orange wire from the E terminal on the terminal
block, and connect to the outdoor thermostat. Connect
the other side of the outdoor thermostat to W2 from the
thermostat.
Optional Electric Heater Kits
This packaged air conditioner is designed to allow optional
electric heat to be fi eld installed as required by the
building's particular heating load. The options available
for each unit are shown in the heater kit installation
instructions.
Optional fi eld-installed electric heater kits are available
in 5 kw to 20 kw heating capacities for single phase, and
9 kw to 15 kw heating capacities for three phase. A separate
installation instruction document for the electric heaters
and their application is shipped with the heater kits.
A single stage 24VAC thermostat should be used with
these units. If electric heat is installed, a single-stage or
two- stage heating thermostat will be required depending
on the heater kit. Install the heater kits as directed by the
instructions supplied with the heater kit. Follow all cautions
and warnings as directed.
11
Advertisement
Table of Contents
