Burner Instructions; Hot Surface Pilot Instructions; Gas Valve - Front; Gas Valve - Rear - York DNZ 024 Installation Manual

66433-YIM-B-1004
MANUAL GAS
SWITCH
(SHOWN IN "OFF
POSITION)
CONTROL
ELECTRICAL
CONNECTION
FIGURE 9 - GAS VALVE - FRONT
V E N T P R E S S U R E L I M I T E R
FIGURE 10 - GAS VALVE - REAR
Adjust as follows:
1. Remove the cap from the valve body. See Figure 10 for
location.
2. To decrease the gas pressure, turn the adjusting screw
counterclockwise.
3. To increase the gas pressure, turn the adjusting screw
clockwise.
NOTE: The correct manifold pressure for natural gas fur-
naces is 3.5 IWG. The correct manifold pressure for
propane (LP) is 10.0 IWG.

BURNER INSTRUCTIONS

To check or change the burners, CLOSE THE MAIN MAN-
UAL SHUT-OFF VALVE AND SHUT OFF ALL POWER TO
THE UNIT.
Unitary Products Group
IGNITOR ELECTRICAL
CONNECTION
MANIFOLD
PRESSURE
TAP
GROUND
TERMINAL
1/2-14 NPT
(OUTLET)
PILOT GAS
CONNECTION
PILOT
ADJUSTMENT
L I N E P R E S S U R E T A P
M A N I F O L D P R E S S U R E
A D J U S T M E N T
( R E M O V E C A P )
1 / 2 - 1 4 N P T
( I N L E T )
1. Remove the two (2) #8 screws holding each burner in
place.
2. Remove the burner assembly from the manifold assem-
bly by moving the burner assembly forward, turn at an
angle and pull back.
3. Burners are now accessible for service.

HOT SURFACE PILOT INSTRUCTIONS

To adjust the pilot flame:
3 / 8
FIGURE 11 - PROPER FLAME ADJUSTMENT
1. Remove the pilot adjustment cover screw.
2. Adjust the pilot adjustment screw to achieve the proper
pilot flame.
3. The pilot flame should envelope 3/8" of the end of the
flame sensor and not contain any yellow color, see Fig-
ure 11.
4. Replace the pilot adjustment cover screw after the pilot
flame is set.
To check, adjust or remove the hot surface pilot assembly,
CLOSE THE MAIN MANUAL SHUT-OFF VALVE AND SHUT
OFF ALL POWER TO THE UNIT.
1. Disconnect the wiring from the gas valve to the hot sur-
face pilot assembly.
2. Remove the two (2) #8 screws holding the hot surface
pilot assembly in place.
3. Remove the hot surface pilot assembly.
To remove the hot surface ignitor and flame sensor assem-
bly:
1. Remove the clip attaching the ignitor and sensor assem-
bly as shown in Figure 12.
17