York Sun Premier GZA1M Series Start-Up & Operation page 54

5587001-YSG-A-520 | Start-Up & Operation Guide
Table 25: Staged Gas Heating Faults List (Continued)
Display Code Color
41 RED
42 RED
43 RED
44 RED
45 RED
51 RED
52 RED
54 RED
55 RED
steady RED
rapid RED
11 YELLOW
21 YELLOW
31 YELLOW
13 YELLOW
23 YELLOW
52 YELLOW
53 YELLOW
11 GREEN
12 GREEN
13 GREEN
33 GREEN
11 GREEN/YELLOW Prime burner is OFF, split burner is in lockout.
12 GREEN/YELLOW Burner states PURGE, split burner is in lockout.
13 GREEN/YELLOW
None None
Modulating Gas Heat
The following sequence refers to the modulating burner
only or burners 1A and 1B, which are arranged in a split
manifold design. Any other burners (2 or 3) are con-
trolled by the staged gas sequence referenced above.
The modulating gas controller receives a demand for
heat from the unit controller through a Modbus signal.
The controller performs a system check to ensure that
all safeties are closed, the APS is open, and the modu-
lating valve is positioned correctly.
• When the system check is satisfactory, the con-
troller enters the pre-purge cycle
• During the pre-purge cycle, the controller en-
sures the APS opens and closes at the cor-
rect settings
• When the pre-purge cycle is satisfactory, the con-
troller enters the ignition cycle
54
Air pressure low switch is closed when inducer is OFF.
Air pressure high switch is closed when inducer is OFF or at low speed.
Air pressure low switch is open when it is expected to be closed.
Air pressure high switch is open or closed when it is expected to be closed or open.
Fuse is open.
Primary limit is open.
Safety checks at start-up failed. Flame circuitry idle state is incorrect.
ID plug failure. Reserved for future use.
Control board failure: gas valve relays, safety relays, etc.
Control is not functional.
ID plug failure to initialize, control is not functional.
Indicates that flame rod has low current.
Indicates that flame rod has low current.
Indicates that both flame rods measured low current.
Call for heat, prime burner is in RETRY.
Call for heat, split burner is in RETRY.
Control is in idle mode, keep alive timeout is expired.
Control is in idle mode, manual override is in OFF position.
Prime burner and split burner is in OFF state.
Burner state purge.
Prime burner is running, burner states GAS_ON, WARMUP, RUN.
Split and prime burners are running.
Prime burner is running, burner states GAS_ON, WARMUP, RUN. Split burner is in
lockout.
Board not receiving 24 volts.
Description
• The modulating valve and inducer enters
their light-off settings
• The DSI module and the spark ignitor energize
• The 2-stage gas valve opens, allowing gas flow
• The burners ignite and the controller receives
flame rectification from the flame sensor
• The spark ignitor remains active for the dura-
tion of the ignition cycle regardless of flame
status
• When flame rectification is not estab-
lished during the ignition cycle, the con-
troller repeats the above sequence up
to three times.
• After three failed ignition attempts, the
controller enters a 1-hour lockout
YORK