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Auxiliary Control Switches
These switches are located behind the room cabinet under the control panel.
2900 and 3900 Series
Switches Description
Left Switches
(1) ALL I2R Heat pump override —
Down — Normal heat pump operation
Up — resistance heat only (3900 Series only)
(2) C: FAN Fan control for cooling operation —
Down — Fan Continuous
Up — Fan Cycle
(3) H: FAN Fan control for heating operation —
Down — Fan Cycle
Up — Fan Continuous
(4) CLASS 2 Remote Thermostat Mode —
Down — Unit Control
Up — Remote Thermostat
(5) LOAD SHED Load Shedding when connected to Central Desk Control System —
Down — Fan shuts off with unit
Up — Fan under “Smart Fan” settings
(6) FREEZ S Freeze Sentinel
™
Override —
Down — Freeze Sentinel ON
Up — Freeze Sentinel OFF
(7) CONST FAN Constant Fan —
Down — Fan runs normally
Up — Fan runs when unit is in STOP position
Right Switches
TL1 – TL3 Cooling temperature limiting (See table at bottom of page)
TL4 – TL6 Heating temperature limiting (See table at bottom of page)
(7) Heat Sentinel switch —
Down — Heat Sentinel OFF
Up — Heat Sentinel ON
(8) Heat Boost (3900 series only) —
Down — Heat Boost OFF
Up — Heat Boost ON
Auxiliary (2900 and 3900 series)
HIGH
COOL
1 2 3 4 5 6 1 2 3 4 5 67 8
UP
DOWN
UP
DOWN
ALLI
2
R (All Electric Heat)
(3900 Series models only)
C: FAN CN (Cooling–Smart Fan)
H: FAN CY (Heating–Smart Fan)
CLASS 2 (Remote Thermostat)
LOAD SHEDDING (CDC)
FREEZ Sen (Freeze Sentinel)
CONST FAN (Constant ON Fan)
NO FUNCTION (Reserved for future use)
TL1 (H) (Temp. Limit 1–Heat)
TL2 (H) (Temp. Limit 2–Heat)
TL3 (H) (Temp. Limit 3–Heat)
TL1 (C) (Temp. Limit 1–Cool)
TL2 (C) (Temp. Limit 2–Cool)
TL3 (C) (Temp. Limit 3–Cool)
7
8
Heat Sentinel
HEAT BOOST
(3900 Series models only)
Cooling and Heating temperature limits are set independently, temperature limiting
switches are in factory-set down position, except as noted.
Cooling Temperature Limits
Switches Up NONE 1 1, 2 2 2, 3 1, 2, 3 1, 3 3
60 64 66 68 70 72 74 76
Heating Temperature Limits
Switches Up 6 4, 6 4, 5, 6 5, 6 5 4, 5 4 NONE
65 70 72 74 76 78 80 85
3900 Series shown