Champion Manufacturing D1EB036 - Manual (Page 14)

173858-YIM-A-0306
14 Unitary Products Group
SEQUENCE OF OPERATION
COOLING
The following sequences of operation are based on using a
standard single-stage cooling thermostat.
WITH POWER TO UNIT AND THERMOSTAT IN COOLING
MODE
1. If the fan switch on the thermostat is in the “ON” position,
the 24 volts at “G” will energize the “K1" relay on the fan
control board, close the ”K1" relay contacts, and ener-
gize the indoor blower motor. If the fan switch is in the
“AUTO” position, the blower will operate only when there
is a call for cooling by the thermostat.
2. On a call for cooling, the thermostat will send 24 volts to
“Y” on the fan control board. The 24 volt signal will ener-
gize contactor “M1", and power will be supplied to the
compressor and outdoor fan motor. If the fan switch on
the thermostat is on the ”AUTO" position, the thermostat
will also send a 24 volt signal to “G” on the fan control
board and the indoor blower will operate as indicated in
step 1.
3. When the demand for cooling has been satisfied, the
“M1" contactor will be de-energized when the 24 volt ”Y"
signal is removed. If the fan switch on the thermostat is
energized when the 24 volt “Y” signal is removed. If the
fan switch on the thermostat is in the “ON” position, the
indoor blower will continue to run. If the fan switch is in
the “AUTO” position, the 24 volt “G” signal will be
removed, and after a 60 second delay, the “K1" relay will
open and de-energize the indoor blower motor.
SECURE OWNER'S APPROVAL
When the system is functioning properly, secure the owner's
approval. Show the owner the location of all disconnect
switches and the thermostat. Teach the owner how to start
and stop the unit and how to adjust temperature settings
within the limitations of the system.
MAINTENANCE
NORMAL MAINTENANCE
Periodic maintenance consists of changing or cleaning filters
and general cleaning of the outdoor coil.
FILTERS - Inspect once a month. Replace Disposable or
clean Permanent Type as necessary. DO NOT replace Per-
manent Type with Disposable.
MOTORS - Indoor and outdoor fan motors are permanently
lubricated and require no maintenance.
OUTDOOR COIL - Dirt should not be allowed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep the coil
clean. Use a brush, vacuum cleaner attachment, or other
suitable means. If water is used to clean the coil, be sure that
the power to the unit is shut off prior to cleaning.
TABLE 12: THERMOSTAT SIGNALS
SIGNAL
ST
A
T
E
BOARD FUNCTION
“G”
ON FAN INSTANT ON
OFF FAN INSTANT OFF
“G”
“Y”
ON
FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON
OFF
COMPRESSOR AND OUTDOOR FAN INSTANT OFF
FAN 60 SECOND DELAY OFF
Prior to any of the following maintenance proce-
dures, shut off all power to the unit, to avoid per-
sonal injury.
Exercise care when cleaning the coil so that the coil
fins are not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.