7
Flame Roll-Out
Protection
Device
Figure 8
Roll-Out Protection Device - Counterflow
Position (GDC)
Flame Roll-Out
Protection
Device
Figure 9
Roll-Out Protection Device - Horizontal
Position (GDC)
Flame Roll-Out
Protection
Device
Figure 10
Roll-Out Protection Device
(GUD and GCD)
O
F
F
ON
M
P
C
1
3
2
WR
INLET
OUTLET
Main Regulator
Adjust
Inlet Pressure Tap
(Side of Valve)
Outlet Pressure Tap
(Side of Valve)
Main
Solenoid
Redundant
Solenoid
ON/Off
Switch
Figure 6
White Rodgers
Model 36E22 or 36E23
ROLL-OUT PROTECTION DEVICE
If flames from the burners are not properly drawn into the
heat exchanger, a flame roll-out limit switch will open
causing combustion to cease. This limit switch must be
reset manually. The roll-out limit switch is located on one
end of the manifold assembly for GUC, GUX and GDC
furnaces (Figure 7 and 8) and in the burner box on GUD and
GCD furnaces (Figure 10). GDC furnaces installed horizon-
tally must have the roll-out limit switch located at the top end
of the manifold assembly. (Figure 9)
AUXILIARY LIMIT CONTROL (GDC AND GCD ONLY)
A second limit control is located on one side of the indoor
air blower. (Figure 11) Disconnect electrical power prior to
removing the non-louvered door to reach the secondary
limit control. The control is in addition to the main control
and shuts the furnace off in case of a blower failure. This
control is a manual reset control, which can be reset only
once. If the unit goes off on limit a second time, contact a
qualified servicer so the problem causing the control to
open can be corrected.
Flame Roll-Out
Protection
Device
Figure 7
Roll-Out Protection Device
(GUC and GUX)
