York W)036 THRU 060 Specifications download pdf (Page 48)

542300-YIM-A-1009

48 Johnson Controls Unitary Products

Figure 23: Typical Single Stage Gas Valves

Figure 24: Typical 2 Stage Gas Valves

Manifold Gas Pressure Adjustment

Adjustments to the high-fire and low-fire (2 stage) gas flow may

be made by turning the pressure regulator adjusting screws on

the automatic gas valve.

Adjust as follows:

1. Remove the adjustment screw cap(s) on the regulator.

2. To decrease the gas pressure, turn the adjusting screw

counterclockwise.

3. To increase the gas pressure, turn the adjusting screw

clockwise.

4. Replace adjustment screw caps.

NOTE: The factory set high-fire manifold pressure for these

furnaces is 3.50 IWG. The actual manifold pressure

depends on the local fuel heating value.

Figure 25: Proper Flame Adjustment

Pilot Checkout

The pilot flame should envelope the end of the flame sensor. To

adjust pilot flame, (1) remove pilot adjustment cover screw, (2)

increase or decrease the clearance for air to the desired level,

(3) be sure to replace cover screw after adjustment to prevent

possible gas leakage.

Put the system into operation and observe through complete

cycle to be sure all controls function properly.

Burner Instructions

To check or change burners, pilot or orifices, CLOSE MAIN

MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELECTRIC

POWER TO THE UNIT.

1. Remove the screws holding either end of the manifold to

the burner supports.

2. Open the union fitting in the gas supply line just upstream

of the unit gas valve and downstream from the main

manual shut-off valve.

3. Remove the gas piping closure panel.

4. Disconnect wiring to the gas valves and spark ignitors.

Remove the manifold-burner gas valve assembly by lifting

up and pulling back.

Figure 26: Typical Flame Appearance

Pilot Adj.

(Under Screw)

“ON” - “OFF” Control

High Fire Adj.

(Under Screw)

Honeywell

VR8204M

Regulator Adj. “HI”

(Under Screw)

Regulator Adj. “LO”

(Under Screw)

“ON” - “OFF” Control

Pilot Adj.

(Under Screw)

Honeywell

VR820RQ

Burner assembly bracket

Flame sensor bulb

1/8” gap between carry-over

tube and flame sensor bulb

Carry-over tube

Gas Supply Pipe

Pilot Tube

Burner Flame

(Blue Only)

Heat Tube

Exchanger

Burner

Adjustable Shutter

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York W)036 THRU 060 Specifications Page 48

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