66435-BIM-B-1004
Unitary Products Group
17
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.
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:
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.
FIGURE 9 - GAS VALVE - FRONT
FIGURE 10 - GAS VALVE - REAR
MANUAL GAS
SWITCH
(SHOWN IN "OFF
POSITION)
CONTROL
ELECTRICAL
CONNECTION
IGNITOR ELECTRICAL
CONNECTION
MANIFOLD
PRESSURE
TAP
GROUND
TERMINAL
1/2-14 NPT
(OUTLET)
PILOT GAS
CONNECTION
PILOT
ADJUSTMENT
V E N T P R E S S U R E L I M I T E R
1 / 2 - 1 4 N P T
( I N L E T )
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 )
FIGURE 11 - PROPER FLAME ADJUSTMENT
3 / 8
Summary of Contents for DYZ 024
Page 20: ...66435 BIM B 1004 20 Unitary Products Group FIGURE 13 TYPICAL WIRING DIAGRAM DYZ 208 230 1 60...
Page 21: ...66435 BIM B 1004 Unitary Products Group 21 FIGURE 14 TYPICAL WIRING DIAGRAM DYZ 208 230 3 60...
Page 22: ...66435 BIM B 1004 22 Unitary Products Group FIGURE 15 TYPICAL WIRING DIAGRAM DYZ 460 3 60...
