Service manual

12
6-561.2
INSTALLATION - ELECTRICAL CONNECTIONS

Amp draw data shown is operating amp draw at
incoming power. For units that use a field installed
accessory step-down transformer as noted, the amp
draw shown is the primary side operating amp draw.
For sizing of circuit protection for equipment with
transformers, please refer to the National Electric
Code.
Supply
Voltage
Power Code
Model PTS Sizes
150 175 200 250 300 350 400
01 (115V)
Motor Amps
2.8 2.8 2.8 5.4 7.5 7.5 8.8
Total Amps
5.0 5.0 5.0 7.6 8.8 8.8 10.1
01 (115V) with
Transformer
Transformer kVA
1.0 1.0 1.0 1.0 1.5 1.5 1.5
208V Total Amps
2.76 2.76 2.76 4.20 4.87 4.87 5.58
01 (115V) with
Transformer
Transformer kVA
0.75 0.75 0.75 1.0 1.5 1.5 1.5
230V Total Amps
2.50 2.50 2.50 3.80 4.40 4.40 5.05
01 (115V) with
Transformer
Transformer kVA
1.0 1.0 1.0 1.0 1.5 1.5 1.5
208V Total Amps
2.76 2.76 2.76 4.20 4.87 4.87 5.58
01 (115V) with
Transformer
Transformer kVA
0.75 0.75 0.75 1.0 1.5 1.5 1.5
230V Total Amps
2.50 2.50 2.50 3.80 4.40 4.40 5.05
01 (115V) with
Transformer
Transformer kVA
0.75 0.75 0.75 1.0 1.5 1.5 1.5
460V Total Amps
1.25 1.25 1.25 1.90 2.20 2.20 2.53
01 (115V) with
Transformer
Transformer kVA
0.75 0.75 0.75 1.0 1.5 1.5 1.5
575V Total Amps
1.00 1.00 1.00 1.52 1.76 1.76 2.02
Table 12.1 - Propeller Unit Model PTS Operating Electrical Data 
115V
1 Phase
208V
1 Phase
230V
1 Phase
208V
3 Phase
230V
3 Phase
460V
3 Phase
575V
3 Phase

Amp draw data shown is operating amp draw at incoming
power. For units that use a field installed accessory step-down
transformer as noted, the amp draw shown is the primary side
operating amp draw. For sizing of circuit protection for equipment
with transformers, please refer to the National Electric Code.

For BTS models, add the Motor Amp Draw and Control Circuit
Amp Draw to get the Total Unit Amp Draw.

Transformers for blower models are typically smaller than those
used for propeller models, as the transformer is not needed for
the blower motor. Size 300-400 use a PSC power exhauster
motor, further reducing the required transformer size.
Table 12.2 - Blower Model BTS Motor Amp Draw  
Supply Voltage
Motor HP 115V/1ph 230V/1ph 208V/3ph 230V/3ph 460V/3ph 575V/3ph
1/4 5.4 - - - - -
1/3 5.0 2.5 1.9 1.6 0.8 0.6
1/2 8.5 3.8 2.3 2.6 1.3 0.9
1 13.4 6.7 4.0 3.8 1.9 1.5
1-1/2 15.4 7.7 5.2 5.2 2.6 1.9
2 - - 6.8 6.6 3.3 2.3
3 - - 10.6 - - 4.0
5 - - 14.3 13.2 6.6 5.2
Supply Voltage
Model Size 115V/1ph 230V/1ph 208V/3ph 230V/3ph 460V/3ph 575V/3ph
150-250 2.2 1.1 1.2 1.1 0.6 0.4
300-400 1.3 0.7 0.7 0.7 0.3 0.3
Table 12.3 - Blower Model BTS Control Circuit Amp Draw  
Supply Voltage
208V 230V 460V 575V
Model Size 3 ph 1 or 3 ph 3 ph 3 ph
150-250 0.5 0.5 0.5 0.5
300-400 0.5 0.25 0.25 0.25
Table 12.4 - Blower Model BTS
Accessory Transformer Size (kVA) 
ELECTRICAL CONNECTIONS
1. Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage.
2. All appliances must be wired strictly in accordance with
wiring diagram furnished with the appliance. Any wiring
different from the wiring diagram could result in a hazard
to persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than rated
voltage.
CAUTION
Ensure that the supply voltage to the appliance, as indicated
on the serial plate, is not 5% less than the rated voltage.
1. Installation of wiring must conform with local building codes, or in the
absence of local codes, with the National Electric Code ANSI/NFPA 70
- Latest Edition. Unit must be electri cally grounded in conformance to
this code. In Canada, wiring must comply with CSA C22.1, Part 1,
Electrical Code.
2. Two copies of the unit wiring diagram are provided with each unit. One
is located in the side access control compartment and the other is
supplied in the literature packet. Refer to this diagram for all wiring
connections.
3. Make sure all multi-voltage components (motors, transform ers, etc.)
are wired in accordance with the power supply voltage.
4. The power supply to the unit must be protected with a fused or circuit
breaker switch.
5. The power supply must be within 5 percent of the voltage rating and
each phase must be balanced within 2 percent of each other. If not,
advise the utility company.
6. External electrical service connections that must be installed include:
a. Supply power connection (115, 208, 230, 460, or 575 volts).
b. Connection of thermostats, or any other accessory control devices
that may be supplied (24 volts).
NOTE: All units with supply voltage 208V and greater must use a field
installed step-down transformer, available as a separate accessory.
Refer to Tables 12.1 through 12.4 for additional information on the
required transformer.
7. Refer to Figure 20.1 for the side access control compartment location.
8. All supply power electrical connections are made in the side access
control compartment of the unit. The low voltage (thermostat and
accessory control devices) can be wired to the terminals in the side
access control compartment. Refer to the wiring diagram for the
terminal location of all low voltage wiring.
W ARNING