York W)036 THRU 060 Specifications download pdf (Page 57)

542300-YIM-A-1009

Johnson Controls Unitary Products 57

2. Check the supply pressure as described in “POST START

CHECK LIST” on page 47. Make adjustments as

necessary.

3. Make sure that the pilot burner is not bent or damaged.

4. Make sure that the ground connections at the pilot burner,

gas valve and ignition control are intact. Check the ignitor

wire for good electrical connection. If all are intact, replace

the ignition control.

The pilot burner lights and the spark stops but the main burners

do not light.

1. Check electrical connections between the ignition control

and the gas valve. If intact, check for 24 volts across

terminals “MV” and “GROUND” terminals. If no voltage

detected, replace ignition control. If voltage is present,

replace gas valve.

Main burners light but exhibit erratic flame characteristics.

1. Adjust air shutters as described in “BURNER AIR

SHUTTER ADJUSTMENT” on page 49.

2. Check the main burner orifices for obstruction and

alignment. Removal procedure is described in BURNER

INSTRUCTIONS on page 48. Clean or replace burner

orifices and burners as needed.

Unit Flash Codes

Various flash codes are utilized by the unit control board (UCB)

and the ignition control board (ICB) to aid in troubleshooting.

Flash codes are distinguished by the short on and off cycle

used (approximately 200ms on and 200ms off). To show normal

operation, the control boards flashes a 1 second on, 1 second

off “heartbeat” during normal operation. This is to verify that the

UCB and the ICB are functioning correctly. Do not confuse this

with an error flash code. To prevent confusion, a 1-flash, flash

code is not used.

Current alarms or active restrictions are flashed on the UCB

LED.

• LAST ERROR - When this button is pressed and released

one time within five seconds, it flashes the last five flash

codes on the board’s LED. The most recent alarm is

shown first and the oldest alarm is shown last.

When pressed and released twice within a five second

span, the fault history is cleared.

• TEST RESET - When this button is pressed and released

one time within five seconds, any anti-short cycle delays

(ASCD) is by-passed for one cycle.

When this button is pressed twice within five seconds, any

active lockouts are reset.

• COMM SET UP - If the board is to be networked with

other units, this button is used to set the network address.

The first time the button is pressed within five seconds, it

scans the bus, then assigns itself the first available

address {starts at 2}. It then flashes that address one time.

Pressing the button two times within five seconds causes

the control to flash its address.

Pressing the button three times within five seconds forces

the control to reset its address to 1, which is the factory

default.

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York W)036 THRU 060 Specifications Page 57

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