Klimaire GM80S Series - Manual (Page 26)

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COOL-H speed. The cool delay-to-fan-on period begins.
After the delay period ends, the optional electronic air
cleaner is energized, and the circulator fan is energized at cool
speed. After the thermostat is satisfied, the compressor is
de-energized and the cool mode delay-to-fan-off period begins.
After the delay-to-fan- off period ends, the circulator fan and
electronic air cleaner (optional) are de-energized.
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If the thermostat fan switch is moved to the ON position, the
circulator fan (cool speed) and optional electronic air cleaner are
energized. When the fan switch is returned to the AUTO posi-
tion, the circulator fan and electronic air cleaner (optional) are
de-energized.
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The thermostat “calls for cooling.”
(See Fig. 27 for thermostat connections)
The thermostat closes the R--to--G--and--Y circuits. The
R--to-- Y circuit starts the outdoor unit, and the R--to--
G--and--Y circuits start the furnace blower motor BLWM on
When the R--to--G circuit is closed by the thermostat, the
blower motor BLWM will operate on COOL-H speed
TIMING SPECIFICATIONS
(All times are in seconds, unless noted otherwise)
PRE-PURGE
INITIAL IGNITOR WARM-UP
(1st 64 attempts)
MINIMUM IGNITOR WARM-
UP
MAXIMUM IGNITOR WARM-
UP
IGNITION ACTIVATION
PERIOD
TRIAL FOR IGNITION
PERIOD
RETRIES
VALVE SEQUENCE PERIOD
INTERPURGE
POST-PURGE
HEAT DELAY-TO-FAN-ON
HEAT DELAY-TO-FAN-OFF*
COOL DELAY-TO-FAN-ON
COOL DELAY-TO-FAN-OFF
AUTO RESET
HUMIDIFIER
ELECTRONIC AIR CLEANER
15
10
6
14
4
7
4 times
35
15
5
30
60/90/
120*/ 180
5
40
60 minutes
YES
YES
50A55-443-01
* These times will vary depending on option switch position. The control is
factory-set at 30 seconds heat delay-to-fan-on, 120 seconds heat delay-to-
fan-off and 40 seconds cool delay-to-fan-off. See OPERATION section for
further information.
NOTE: Furnace control must be grounded for proper operation or
control will lock out. Control is grounded through green wire routed
to gas valve and manifold bracket screw. follow the sequence of
operation through the different modes.
Read and follow the wiring diagram very carefully.
The blower door must be installed for power to be conducted
through the blower door interlock switch ILK to the furnace control
CPU, transformer TRAN, inducer motor IDM, blower motor BLWM,
hot--surface igniter HSI, and gas valve GV.
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(See Fig. 27 for thermostat connections.)
The wall thermostat “calls for heat,” closing the R--to--W circuit. The
furnace control performs a self--check, verifies the pressure switch
contacts PRS are open, and starts the inducer motor IDM.
a. Inducer Prepurge Period-- The inducer blower and optional
humidifier are energized and the ignitor is powered within one
second. the pressureswitch contacts PRS close to begin a
15--second prepurge period.
b. Igniter Warm--Up-- At the end of the prepurge period, the
Hot--Surface igniter HSI is energized for a 10--second igniter
warm--up period.
This controller has an adaptive algorithm that adjusts the duration
of the ignitor warm-up, to extend ignitor life. Upon initial application
of power, the warm-up time is 10 seconds. The ignitor on-time will
then be increased or decreased depending on whether or not flame
is achieved. The warm-up time is limited to a maximum of 14
seconds. During the first 64 warm-up periods following power-up, the
warm-up time may not be less than 10 seconds.
Upon a call for heat, if the warm-up time has not been locked, it will
be decreased by one second. This reduction of the ignitor ontime
will continue until flame fails to be achieved (resulting in a retry).
In the event of a retry, the warm-up time will be increased by two
seconds and locked in at that duration. Once the warm-up time is
locked, it remains fixed until another call for heat results in a retry, in
which case the warm-up time is again increased by two seconds and
remains locked.
In the event of two successive retry attempts, the warm-up time
will be unlocked and set to 14 seconds. If flame is then achieved,
the warm-up time will begin adapting again with the next call for
heat. If, however, this third attempt fails to achieve flame, the control
will go into system lockout.
c. Trial--for--Ignition Sequence-- When the igniter warm--
up period is completed, the main gas valve relay contacts
GVR close to energize the gas valve GV, the gas valve
opens 7 second. The gas valve GV permits gas flow to the
burners where it is ignited by the HSI. a 7--second flame
proving period begins.
d. Flame--Proving--When the burner flame is proved at the
flame--proving sensor electrode FSE, the furnace control
CPU begins the blower--ON delay period and continues
to hold the gas valve GV open.
If flame is not detected, the gas valves is de-energized, the ignitor is
turned off,and the furnace control goes into the “retry” sequence.The
“retry” sequence provides a 15-second wait following an unsuccess-
ful ignition attempt (flame not detected). After this wait, the ignition
sequence is restarted with an additional 2 seconds of ignitor
warm-up time. If this ignition attempt is unsuccessful, one more retry
will be made before the control goes into system lockout.
If flame is detected, then lost, the furnace control will repeat the
initial ignition sequence for a total of four “recycles”. After four
unsuccessful “recycle” attempts, the control will go into system
lockout.
e. Blower--On Delay-- If the burner flame is proven, the
blower motor is energized on HEAT-H speed 30 seconds after
the gas valve GV is energized.
Simultaneously, the electronic air cleaner terminal EAC is
energized and remains energized as long as the blower motor
BLWM is energized.
f. Blower--Off Delay--When the thermostat is satisfied, the
R--to--W circuit is opened, de--energizing the gas valve GV,
stopping gas flow to the burners, The inducer motor IDM will
remain energized for a 5-second post--purge period.
humidifier is de-energized. The blower motor BLWM and air
cleaner terminal EAC will remain energized for 60, 90, 120, or
180 seconds (depending on the HEAT-OFF delay selection).
The furnace control CPU is factory--set for a 180--second
HEAT-OFF delay.