Lennox G26 Series - Differential Pressure Switch Operation; Differential Pressure Switch Circuitry

IndoorBlowerSpeeds(Referto Figure31)
1- When the thermostat is set to "FAN ON", the indoor
blower will run continuously on low speed when there
is no cootingor heating demand.
2 - When there is a cooling demand, the indoor blowerwill
run on the cooling speed.
3 - When there is a heating demand, the indoor blower
will run on the heating speed.
G26CONTROLBOX
TRANSFORMER
CIRCUIT
• BREAKER
DOOR _
INTERLOCK SURELIGH DETACHABLE
SWITCH CONTROL TERMINAL STRIP
FIGURE 29
SURELIGHT INTEGRATED CONTROL BOARD
P_ PAF_ ACB
I_ MI LOW
IIH 111t
I6_ITION SYST(_
ANSI _ZI _Z0 ATG_IATIC
Z4VAC 60Hz 0_5 A MAX_
÷
ACC 12OVAC HTG 12o VAC RETtJ_
-- NEUTRALS --
TX.o,,co÷ Ilnll
m MEUTRALS m
C>j2 _ ÷
FLAME
HEATOFFBELAY SENSE j
S!-I SI-2 TIME
0_F OFF 60 9EC
OFF ON 90 5EC
(_N OFF +20 SIEC
D -
I
r -- 1
I I I
I i I
÷
I
__ --_ L
F -- 1
___ ® ®
Y G W R C
Y G W R C
ACS COOL
ACS HEAT
PARK
ACB LOW
ACC
TX
HOT
HTG ACC
NEUTRALS
24VAC HOT
24VAC RTN
FLAME SENSE
TERMINAL DESIGNATIONS
Blower - Cooling Speed (Line Volt)
Slower - Heating Speed (Line Volt)
Alternate Blower Speeds (Dead)
Continuous Low Speed Blower
Accessory Terminal (Line Volt)
120VAC Hot to Transformer
120VAC Hot Input
Heat Only Accessory (Line Volt)
120VAC Neutrals
24VAC Hot fTomTransformer
24VAC Return fTom Transformer
Flame Sense Terminal
FIGURE 30
Page 18