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NOTE 5) If a new Heating request arrives while the control is waiting for the Heat Fan Off Delay time t o expire, the FCB will wait for the
selected Heat Fan Off Delay, and then start a new heating cycle.
Heating (W1 & W2) Request (two-stage thermostat operation, SW1 DIP switch #3 must be in
ON position) (see furnace wiring diagram):
24VAC signals applied to W1 terminal of FCB.
S Same response as single stage thermostat operation described above except the burners, inducer, and blower will not go to high heat rate,
and High Heat Fan speed unless a W2 signal is applied.
24VAC signal applied to W1 and W2 terminals of FCB.
S Same light--off routine as described for the signal stage thermostat operation except burners light at High Heat rate, the inducer remains on
high speed after ignition, and the FCB will delay High Heat blower operation for the 30-- second High Heat Fan On Delay.
NOTE 6) The FCB responds without delay to the presence or loss of W2 (with W1 constant). W1 & W2 result in high inducer, High Heat
rate, and High Heat Fan speed. W1 only results in low speed inducer, Low Heat rate, and Low Heat Fan speed.
Heating R equest with Gas Shut Off:
24 VAC signals applied to W1 terminal of FCB.
The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours, and then try for ignition again as long as the heat call remains.
Power reset will clear lockout.
S Inducer motor turns on at high speed.
S Following a 15 second prepurge delay after the low pressure switch closes, the igniter begins warm up.
S The igniter glows red-- hot for 22 seconds, then turns off. The FCB flashes error code 6.
S The igniter stays off for 17 seconds, then begins to warm up again.
S The igniter glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.
S The igniter stays off for 17 seconds, then begins to warm up again.
S The igniter glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6.
S The igniter stays off for 17 seconds, then begins to warm up again.
S The igniter glows red hot for 22 seconds then turns off. The FCB proceeds to soft lockout. Stops flashing error code 6, and begins flashing
error code 6 + 1.
S The inducer motor de--energizes 15 seconds after error code 6 + 1 starts flashing.
Furnace Control Board Diagnostic Codes (See Fig. 55):
OFF = 24VAC or 115VAC is off, fuse is open
Heartbeat = Normal operation or no previous Diagnostic Code
ON SOLID = Soft Lockout - Furnace Control Error (1 hr delay) If code repeats immediately following
power reset then replace control
1 Flash = Not used
2 Flashes = Pressure switch(es) closed when should be open
3 Flashes = Low pressure switch open when should be closed
4 Flashes = Limit or flame roll-out switch open (less than 2 minutes)
5 Flashes = Flame sensed out of sequence
6 Flashes = Failure to ignite or flame sense lost while running
6 + 1 Flashes = Soft Lockout - Max of four trials for ignition reached (3 hr delay)
7 Flashes = Limit or flame roll-out switch open longer than 2 minutes (1 hr delay) (roll-out switch
requires manual reset)
8 Flashes = Permanent Lockout - Gas valve relay contact stuck closed or miswired gas valve (power
reset only)
9 Flashes = High pressure switch open when should be closed
10 Flashes = Improper transformer phasing on twinned applications or improper line voltage polarity.
* If status code recall is needed, briefly (2--3 seconds) remove then reconnect one limit switch wire (main or rollout) to display last stored
status code. Do not remove power or blower door before initiating status code recall or code will be lost. Code is automatically cleared after
72 hours or upon power reset.
* Proper flame sense microamps: 0.7 microamps D.C. minimum, 2.0 -- 4.0 microamps nominal
NOTE 7) Continuous blower selection DIP 10 and 11 will cause the blower to run in high cooling speed for all low cooling (Y1) calls.
Continuous blower DIP settings of 00 and 01 will allow low cooling (Y1) calls to operate normally.
S HUMIDIFIER -- The 24VAC HUM is energized when the low pressure switch closes on a call for heat. The 115V HUM (called
HUM on Control) is energized when the inducer is energized.
S ELECTRONIC AIR CLEANER -- EAC is energized when there is a blower speed call. It is NOT energized when blower operates
in the hard-- wired continuous fan mode.
58HDV