Componentry Specifications - Bard W48A2PQ Installation And Service Instructions Manual

COMPONENTRY SPECIFICATIONS

WARNING
!
Electrical shock hazard.
Disconnect VAC power supply before
servicing.
Failure to do so could result in electric shock
or death.
LOW PRESSURE SWITCH
Cut-out pressure: 40psi (+/- 4 psi)
Cut-in pressure: 55psi (+/- 4psi)
HIGH PRESSURE SWITCH
Cut-out pressure: 650psi (+/- 10 psi)
Cut-in pressure: 520psi (+/- 15psi)
LOW AMBIENT CONTROL
Modulating head-pressure control that allows full
speed at pressures above 315psi. Below 315psi, the
control will slow fan speed—following internal head
pressures—until a minimum RPM is reached (approx
300 RPM). Below this point, the control will shut the
fan completely off until internal pressures rise. The
control is preset from the factory, but should adjustment
become necessary, there is an adjustment screw located
on the bottom of the control behind a weatherproof cap.
One full turn clockwise equals approximately +48 psi.
REMOTE INDOOR TEMPERATURE
SENSOR
White, decorative plastic casing, Bard logo, field-
installed in shelter: 10k ohm resistance, see Table 2.4.
MIXED AIR TEMP SENSOR
4.75" stainless probe factory mounted in supply
opening of wall-mount unit: 10k ohm resistance, see
Table 2.4.
RETURN TEMPERATURE SENSOR
Exposed thermistor-element style with copper-coated
steel clip, attached in return opening of wall-mount
unit: 10k ohm resistance, see Table 2.4.
EVAPORATOR TEMP SENSOR
(FREEZESTAT)
Exposed thermistor-element style with copper-coated
steel clip, attached to evaporator coil of wall-mount unit:
10k ohm resistance, see Table 2.4.
Manual 2100-642
Page 52 of 82
OUTDOOR TEMPERATURE/HUMIDITY
SENSOR
Gray, weather-proof octagonal case with dip tube,
located in condenser section of wall-mount unit.
• Temperature sensor: 10k ohm resistance,
see Table 2.4.
• Humidity sensor: 4-20mA.
COMPRESSOR CONTROL MODULE
Compressor protection device that has an adjustable
30-second to 5-minute timer (red-dial). This module
features a delay-on make for initial start-up (or anytime
power is interrupted) for a minum 2 minutes plus
10% of the red-dial setting. There is no delay during
routine operation of the unit. The compressor control
module (CCM) also monitors the high pressure switch,
and will allow one automatic retry (after soft lockout
delay) before disabling the compressor in a hard lockout
(requires manual reset). If hard lockout does occur, the
ALR terminal on the CCM will become active with 24V,
which will power the high pressure relay within the wall-
mount unit, breaking a digital input to the PLC control—
signaling a high-pressure situation to the system.
PHASE MONITOR
Used only on 3-phase equipment, the phase monitor is a
compressor protection device that will prohibit operation
of the compressor if the device senses a possible
reverse-rotation situation due to incorrect phasing. On
a call for compressor (and only compressor), the device
will check incoming phase, check for severe voltage
imbalance and check for proper frequency. Under
nominal conditions, a green LED light will show on the
face of the monitor. If there is improper phasing, voltage
imbalance or frequency deviation, the device will show a
red LED light and prohibit compressor operation.
TRANSFORMER
100VA with external 5A circuit breaker, 575VAC
convertible. Directly feeds low voltage in wall-mount
unit during normal operation.
FUSED TERMINAL BLOCKS
Black, hinged DIN-rail mount terminal block with
an internal glass tube fuse, used in the LC-Series
controller for 24VAC power supply to both hydrogen
and smoke alarms: Phoenix UK5-HESI
AIRFLOW SWITCH
Located inside the blower compartment, this switch
measures air pressure proving and will send out an
alarm on motor lockout (see Figure 2.19 on page 54).
Manual reset only. Default setting: 0.8" static.