Wiring - Main Power; Wiring - Low Voltage Wiring; Optional Climate Controls Seq. Of Op; Figure 15 Component Location - Bard Q24A2DA Installation Instructions Manual

WIRING – MAIN POWER
Refer to the unit rating plate and/or Table 2 for wire
sizing information and maximum fuse or "HACR
Type" circuit breaker size. Each unit is marked with
a "Minimum Circuit Ampacity". This means that the
field wiring used must be sized to carry that amount
of current. Depending on the installed KW of electric
heat, there may be two field power circuits required. If
this is the case, the unit serial plate will so indicate. All
models are suitable only for connection with copper
wire. Each unit and/or wiring diagram will be marked
"Use Copper Conductors Only". These instructions
MUST BE adhered to. Refer to the National Electrical
Code (NEC) for complete current carrying capacity
data on the various insulation grades of wiring material.
All wiring must conform to NEC and all local codes.
The electrical data lists fuse and wire sizes (75°C copper)
for all models, including the most commonly used heater
sizes. Also shown are the number of field power circuits
required for the various models with heaters.
The unit rating plate lists a "Maximum Time Delay
Relay Fuse" or "HACR Type" circuit breaker that is to
be used with the equipment. The correct size must be
used for proper circuit protection, and also to assure that
there will be no nuisance tripping due to the momentary
high starting current of the compressor motor.
The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect.
FIGURE 15
COMPONENT LOCATION
ELECTRIC
HEATERS
UNIT
MOUNTED
THERMOSTAT
LOCATION
DEHUMIDIFICATION
CONTROL
(OPTIONAL)
Manual 2100-602A
Page 20 of 41
See "Start Up" section for information on three phase
scroll compressor start-ups.
The field wiring connections are located behind the
top and hinged panel in the circuit breaker panel. See
Figure 15.
WIRING – LOW VOLTAGE WIRING
230/208V, 1 PHASE AND 3 PHASE EQUIPMENT
DUAL PRIMARY VOLTAGE TRANSFORMERS.
All Equipment leaves the factory wired on 240V tap.
For 208V operation, reconnect from 240V to 208V tap.
The acceptable operating voltage range for the 240 and
208V taps are as noted in Table 3.
NOTE: The voltage should be measured at the field
OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION
The standard Climate Control Option X is a remote
thermostat connection terminal block. See Figure 17 for
wiring diagram. Compatible thermostats are listed in
Table 4.
The Climate Control Option E is an electronic,
programmable thermostat with humidistat. The subbase
of the thermostat is factory wired to the front panel of
SIDE FIELD WIRE
the unit. See Figure 18 for wiring diagram. Compatible
ENTRANCE
for use with Energy Recovery Ventilator. The thermostat
can be set in the heat, cool or automatic mode. When
REMOTE
the thermostat is set in the heat mode, it can heat only to
THERMOSTAT
maintain the temperature set on the thermostat. When
TERMINAL
BLOCK
the thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
INDOOR
When the thermostat is set in the automatic mode, the
BLOWER
thermostat can change automatically to the heat or cool
modes to maintain the temperature set on the thermostat.
The Climate Control Option I is an electronic,
programmable thermostat with humidistat and a CO
CIRCUIT
controller. The subbase of the thermostat and CO
BREAKER PANEL
controller are factory wired to the front panel of the unit.
& CONTROLS
See Figure 19 for wiring diagram. The thermostat can
be set in the heat, cool or automatic mode. When the
LOWER
thermostat is set in the heat mode, it can heat only to
CONTROL
maintain the temperature set on the thermostat. When
PANEL
the thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
When the thermostat is set in the automatic mode, the
thermostat can change automatically to the heat or cool
modes to maintain the temperature set on the thermostat.
TABLE 3
OPERATING VOLTAGE RANGE
TAP
240V
208V
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
RANGE
253 – 216
220 – 187
2
2