Table 79: Flash Codes for the Gas Heat Ignition Control Board
Flash Code
Description
Technician Corrective Action
Ignition Control
Response to Flash Code
Method for Reset
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)
7 Flashes
Open Rollout
- 24 VAC has
been lost to the control's
rollout switch input (P1-6 pin)
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 gas lines provide proper gas inlet pressure. Verify that the gas
valve is adjusted to provide proper manifold pressure. 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. Verify wiring for the rollout switch is intact.
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.
Closure of the rollout
switch (24 VAC input
to P1-6 pin) then
cycling first stage
heat input or cycling
24 VAC power to
the ignition control.
8 Flashes
The Gas Valve Failed To Shut Off
-
flame has been sensed for longer
than 2 seconds when the first
stage gas valve output is off
Verify that the gas valve is not slow to shut off, leaks by
or otherwise does not completely shut off gas flow when
de-energized. Verify the gas valve wiring to is intact and
not shorted in a manner that would improperly allow 24
VAC from another circuit to be applied to the gas valve.
The gas valve output relay contact
opens so gas valve operation is not
permitted, the induced draft output
relay closes to operate the inducer.
Cycling 24 VAC
power to the
ignition control.
9 Flashes
Indoor Airflow Failure Open Limit
- 24 VAC has been lost to the
control's limit switch input (P1-9
pin) for a duration of more than
6 minutes with 24 VAC present at
the control's W1 input (P2-3 pin)
Correct the no/extremely low indoor airflow condition. Verify filters,
indoor coil and blower wheel are clean. Verify that the blower belt is
intact, 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 without blockages. Verify indoor
air volume is at least the minimum required for the heat section
by using the Airflow Mesurement Charts in the Technical Training
Manual or other method such as temperature rise, balometer, etc.
Verify wiring for main and auxiliary limit switches is intact. Verify
main and auxiliary limit switches are not failed in an open position.
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.
Cycling 24 VAC
power to the
ignition control.
a.
Gas Valve Miss-wire
- 24 VAC has
been present for longer than 1
second at the first stage and/or
second stage gas valve output
(P1-7 pin and/or P1-4 pin) when
the gas valve is commanded
off by the ignition control
10 Flashes
b.
Ignition Control Gas Valve Relay
Contact Failed to Close
- 24 VAC
has not been sensed for longer
than 1 second at the first stage
and/or second stage gas valve
output (P1-7 pin and/or P1-4 pin)
when the gas valve is commanded
on by the ignition control
Verify gas valve wiring from the ignition control to the gas valve is
intact and not shorted in a manner that would improperly allow 24
VAC from another circuit to be applied to the control's P1-7 and/
or P1-4 gas valve output pins. Verify the control's gas valve output
relay contacts for first stage (P1-8 to P1-7) and second stage (P1-7
to P1-4) are not shorted or fail to close when commanded on.
Initally, the output relay contacts
open. Then, if 24 VAC remains
present at the P1-7 pin after
15 seconds, the induced
draft output relay contact
closes to operate the inducer.
Cycling 24 VAC
power to the
ignition control.
INSTALLATION MANUAL ZY SERIES 3 - 10 ton 60 Hertz R-410A
131
Johnson Controls Ducted Systems
Содержание ZY Series
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