York International ZQ Series, Installation Manual

Page: 82 / 92

Table 62: Flash Codes for the Gas Heat Ignition Control Board
Flash Code Description Technician Corrective Action
Ignition Control
Response to Flash Code
Method for Reset
2 Flashes
The Induced Draft Pressure Switch
Did Not Close - 24 VAC was not
received to the ignition control's
pressure switch input (P1-8
pin) within 10 seconds of the
ignition control energizing
the induced draft motor or
24 VAC was later lost to the
control's pressure switch
input while the ignition control
energized the induced draft motor
Verify that the induced draft motor is operable, the ignition
control's L1 to IND contacts are not open, the induced draft blower
wheel is intact and there are no blockages in the combustion
air / induced draft path. Verify that the induced draft pressure
switch sensing tubing is intact. With an incline manometer,
digital manometer or Magnehelic
®
gauge teed into the pressure
switch sensing line verify that the negative pressure exceeds
the setting listed on the induced draft pressure switch label
and the switch's contacts correctly close at the setting listed
Gas valve operation is not
permitted/ends when the induced
draft pressure switch input is not
present. The ignition control's
L1 to IND output relay contact
will cycle closed for 5 minutes/
open for 30 seconds until 24 VAC
is received to the pressure switch
input or the heating demand ends.
Closure of the
pressure switch
(24 VAC input to
P1-8 pin), cycling
first stage heat
input or cycling 24
VAC power to the
ignition control.
3 Flashes
The Induced Draft Pressure Switch
is Stuck Closed - 24 VAC is received
to the control's pressure switch
input (P1-8 pin) at the same time
as 24 VAC to initiate heating
operation is received at the
control's W1 input (P2-3 pin)
Verify that the induced draft pressure switch contacts are not
stuck or welded closed. Verify that the ignition control's L1 to IND
contacts are not stuck or welded closed causing the induced draft
motor to run continuously. Verify that the wiring from the ignition
control's P1-3 pin through the induced draft pressure switch to the
ignition control's pressure switch input (P1-8 pin) is not shorted.
The output relay contacts
open so inducer and gas valve
operation is not permitted.
Opening of the
pressure switch
(loss of 24 VAC input
to P1-8 pin) then
cycling first stage
heat input or cycling
24 VAC power to
the ignition control.
4 Flashes
Flame Could Not Be Established
- A flame signal of 0.2μa
or greater could not be
established in three consecutive
attempts for ignition at the
initiation of the heating cycle
Verify that the unit has proper electrical grounding. Verify the 24
VAC common and ignition control cabinet ground references are
intact. Monitor the flame signal. Verify that combustion air openings
are without blockages and that the unit has proper clearance to the
structure and adjacent units. Verify that the burners are clean and
without blockages that could interfere with gas flow. Verify that the
ignitor sparks with an ≈1/8" gap to the crossover area of the left
burner. Verify that the flame sensor is intact and positioned with an
≈1/8" gap to the right burner. Verify that the gas lines have been
purged of air and provide proper gas inlet pressure. Verify that the gas
valve is opening and adjusted to provide proper manifold pressure.
Verify that the wiring to the gas valve is intact. Verify that there is no
wind, rain or snow entering the heat compartment to interfere with
ignition or the burners. Verify that there are no conditioned air leaks
or heat exchanger breaches to interfere with ignition or the burners.
Immediately after the third
ignition trial: the gas valve output
relay contact opens so gas valve
operation is not permitted,
following a 5 second inducer
post purge the induced draft
output relay contact opens so
inducer operation is not permitted.
Cycling first stage
heat input, cycling
24 VAC power to
the ignition control
or expiration of
the 60 minute
"watchdog" timer.
5 Flashes
Flame Loss - After being
established during ignition trials,
flame signal dropped below 0.2μa
five times during one heating cycle
Verify that the unit has proper electrical grounding. Verify the 24
VAC common and ignition control cabinet ground references are
intact. Monitor the flame signal. Verify that combustion air openings
are without blockages and that the unit has proper clearance to
the structure and adjacent units. Verify that the burners are clean
and without blockages that could interfere with gas flow. Verify
that the flame sensor is intact and positioned with an ≈1/8" gap
to the right burner. Verify that the gas lines have been purged
of air and provide proper gas inlet pressure. Verify that the gas
valve provides proper manifold pressure. Verify that the wiring to
the gas valve is intact. Verify that there is no wind, rain or snow
entering the heat compartment to interfere with ignition or the
burners. Verify that there are no conditioned air leaks or heat
exchanger breaches to interfere with ignition or the burners.
Immediately after the fifth flame
loss: the gas valve output relay
contact opens so gas valve
operation is not permitted,
following a 5 second inducer
post purge the induced draft
output relay contact opens so
inducer operation is not permitted.
Cycling first stage
heat input, cycling
24 VAC power to
the ignition control
or expiration of
the 60 minute
"watchdog" timer.
6 Flashes
Open Limit - 24 VAC has been
lost to the control's limit switch
input (P1-9 pin) or 24 VAC has
been lost to the control's limit
switch input (P1-9 pin) for a
duration of 6 minutes or less
with 24 VAC present at the
control's W1 input (P2-3 pin)
Verify proper gas manifold pressure. Correct the inadequate
indoor airflow condition. Verify filters, indoor coil and blower
wheel are clean. Verify that the blower belt is properly maintained
and adjusted; the blower motor fuses are intact, contactor and
motor are operable and wheel has the correct rotation. Verify that
the ducting is not restrictive. Verify indoor air volume is at least
the minimum required for the heat section by using the Airflow
Measurement Charts in the Technical Training Manual or other
method such as temperature rise, balometer, etc. Verify heating
mode blower on/off delays are proper for the heat type and provide
adequate heat section cooling at the termination of the heating
cycle. Verify wiring for main and auxiliary limit switches is intact.
The gas valve output relay contact
opens so gas valve operation
is not permitted, the induced
draft output relay contact
closes to operate the inducer.
Closure of the limit
switch(es) (24 VAC
input to P1-9 pin)
INSTALLATION MANUAL ZQ SERIES 3 - 5 ton 60 Hertz R-410A 82
Johnson Controls Ducted Systems