Bard QTEC QH303D Installation Instructions Manual Download

Page: 15 / 38

Manual

2100-435D

Page

15 of 38

NOTE: The voltage should be measured at the field

power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).

The standard Climate Control

Option X

is a remote

thermostat connection terminal block. See Figure 16 for
wiring diagram. Compatible thermostats are listed in
Table 4.

The Climate Control

Option E

is an electronic,

programmable thermostat and a humidistat. The sub
base of the thermostat and the humidistat are factory
wired to the front panel of the unit. See Figure 16A for
wiring diagram. Compatible for use with Energy
Recovery Ventilator or Ventilator.

The Climate Control

Option F

is an electronic, non-

programmable thermostat, timer and a humidistat. The
sub base of the thermostat and the timer are factory
wired to the front panel of the unit. See Figure 16B for
wiring diagram. Compatible for use with Energy
Recovery Ventilator or Ventilator.

The Climate Control

Option G

is an electronic,

non-programmable thermostat and humidistat. The
subbase of the thermostat is factory wired to the front
panel of the unit. This option is compatible for use with
the optional CS2000A Energy Control Monitor and a
terminal block is provided for connection to the
CS2000A. See Figure 16C for wiring diagram.
Compatible for use with Energy Recovery Ventilator or
Ventilator.

NOTE: On options X and G the CS2000A (or other

field provided means to control ventilation)
must be used if any of the mechanical
(motorized) ventilation options are installed.

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.

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 14.

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 form 240V to 208V tap.
The acceptable operating voltage range for the 240 and
208V taps are as noted in Table 3.

TABLE 3

OPERATING VOLTAGE RANGE