York W)036 THRU 060 Specifications download pdf (Page 53)

542300-YIM-A-1009

Johnson Controls Unitary Products 53

Figure 29: ZF060 (5.0 Ton) Operating Pressures

Gas Heat Troubleshooting Guide

Before beginning symptomatic troubleshooting activities read

the flash code LEDs on the unit control board (UCB) and the

ignition control board (ICB). Fault codes have a quick sequence

of flashes indicating the flash code number followed by a pause

with the LED off. The ICB flash codes are repeated until the

fault is cleared. The ICB monitors itself, the centrifugal switch,

lockout due to > 16 pilot flame losses, primary limit, rollout and

a flame present when the ICB expects no flame.

With power applied to the unit, if the LED on the ICB is flashing

the heartbeat and the furnace will not operate, then proceed to

the symptomatic troubleshooting section. If the ICB LED is not

flashing, then perform the ICB troubleshooting procedures. If the

ICB has a flash code other than the heartbeat, then determine

the flash code and locate its troubleshooting procedures in the

flash code troubleshooting section. Refer to Table 26 for flash

code identification and component causing fault.

230

280

330

380

430

480

530

105 110 115 120 125 130 135 140 145 150 155 160

Discharge Pressure (psi)

Suction Pressure (psi)

5 Ton Charging Chart

115º

105º

95º

85º

75º

Outdoor Temp (ºF)

Note: Make sure that condenser fan is running when charging.

65º

Troubleshooting of components may require opening

the electrical control box with the power connected to

the unit. Use extreme care when working with live

circuits! Check the unit nameplate for the correct line

voltage and set the voltmeter to the correct range before

making any connections with line terminals.

When not necessary, shut off all electric power to the

unit prior to any of the following maintenance

procedures so as to prevent personal injury.

Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and

dangerous operation, which could cause injury to person

and/or damage unit components. Verify proper

operation after servicing.

The furnace may shut down on a high temperature

condition during the procedure. If this occurs, the UCB

energize the supply air blower motor until the high

temperature limit has reset. Caution should be used at

all times as the supply air blower may energize

regardless of the room thermostat fan switch position.

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York W)036 THRU 060 Specifications Page 53

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