© Copyright 2018 CGC Group Inc.
Installation Operation Maintenance Manual is Subject to Change without Notice- Last Revised June 2018
11
BULLDOG SideWinder – Installation, Operation, and Maintenance Manual
FAN OPERATION
1. A call on “G” for fan on the thermostat terminal strip will cause the fan to operate
continuously on low fan speed through K5.
2. A call on “W” for heat on the thermostat terminal strip will also cause the fan to
operate on low speed. If the heating call is still present after a 10 minute period, the
multi speed units will switch the fan to high speed through Relay K6.
3. A call on “Y” for cooling on the thermostat terminal strip will cause the fan on multi-
speed units to immediately step up to high speed through Relay K6.
4. Fan operation will terminate whenever all calls are dropped.
5. When the fan is operating at high speed, both relays are energized along with their
associated LED indicators.
HEATING OPERATION
1. A call on “W” for heat will activate the fan at low speed. It will simultaneously energize
the heat relay K2 and its associated LED. The relay K2 will provide 24V AC fused power
directly to the heat valve.
COOL START UP
1. A call on “Y” for cooling initiates a series of checks prior to the start up of the
compressor. These checks include:
a. Power ON timer – Compressor operation is delayed for approximately 5 minutes
after restoration of power. This prevents all units from coming on line at the
same time when power is restored. It also prevents compressor jolting with
intermittent power.
b. Anti-Recycle timer – There is a 5-minute anti-recycle delay timer that allows the
refrigeration cycle to achieve pressure equalization so that the compressor is
unloaded upon start up.
c. High Pressure Switch – The high refrigerant pressure switch must be closed prior
to start. LED 11 will be ON.
d. Low Pressure Switch – The low pressure switch operates primarily as a loss of
charge protector. It must be closed for compressor start up and its LED 12 will
be ON. The pressure switch has a 1 minute time ignore subsequent to start-up.
In some situations, particularly when the unit is cold, the pressure switch will
open during start-up. If the switch does not remake within the ignore period,
the compressor will immediately be stopped.
e. Air temperature sensor Ta – Sensor Ta will prevent compressor operation if the
air flowing through the unit is below 55
°
F (15
°
C).
f. Water temperature sensor Tw – Sensor Tw will prevent compressor operation if
the outgoing fluid temperature is above 125
°
F (52
°
C).
g. Refrigerant temperature sensor Tr – Sensor Tr will prevent compressor
operation if the coil temperature is below 40
°
F (2
°
C).
h. Any of the above faults will be indicated with the Diagnostic Code
described under the DIAGNOSTICS section.
