Installation Guide
14
11-HD14D1-9-EN
6.6 Stage Thresholds
The threshold to allow operation is a Load Value greater
than 5 and operation is always terminated with a Load
Value less than 1.
Load Value also determines when additional stages of
operation are requested. To prevent rapid cycling between
stages, a stage threshold is enforced. The stage threshold
is dependent on the applied system.
LV=100
LV=200
STAGE 2
COMPRESSOR STAGING THRESHOLDS
100-115
100-115
100-125
100-125
100-110
100-110
Y1 to Y2
Y1 to Y2
HP to W1
HP to W1
HP to Dual Fuel
HP to Dual Fuel
ST
A
GE 3
ST
A
GE 1
LV=100
LV=200
LV=300
LV=400
ST
A
GE 5
ST
A
GE 1
STAGE 2
STAGE 3
STAGE 4
AUX ELECTRIC HEAT - STAGING THRESHOLDS
100-
115
100-
115
200-
215
200-
215
300-
315
300-
315
W1 to W2
W1 to W2
W2 to W3
W2 to W3
Compressor to W1
Compressor to W1
LV=100
LV=200
LV=300
ST
A
GE 4
ST
A
GE 1
STAGE 2
STAGE 3
AUX FOSSIL HEAT - STAGING THRESHOLDS
100-
125
100-
125
175-
190
175-
190
175-
190
175-
190
Inhibit - Compressor to W1
Inhibit - Compressor to W1
W1 to W2
W1 to W2
W2 to W3
W2 to W3
LV=100
LV=200
LV=300
ST
A
GE 4
ST
A
GE 1
STAGE 2
STAGE 3
AUX WET HEAT - STAGING THRESHOLDS
100-
125
100-
125
200-
215
200-
215
Compressor to W1
Compressor to W1
W1 to W2
W1 to W2
6.7 Stage Inhibits
When the stage threshold is exceeded, a stage inhibit is
applied. The stage inhibit calculates the rate of recovery
over a 10-minute period and determines if the next stage is
required to meet the current demand. If the rate of recovery
is great enough, a new 10-minute inhibit is enabled. The
Control will not go to the next stage of operation until it
determines that the current stage cannot satisfy the current
demand. Stage inhibits only apply between compressor
stages and compressor heat to indoor heat. Stage inhibits
do not apply to indoor heat stages.
Stage inhibits can be disabled in the 850 Control
Installer Setup>Comfort Settings.
START INHIBIT
10 Minutes
Y1 “ON”
Y2 “ON”
Y1 “ON”
LV = 100
LOAD VALUE (LV)
LV = 110
Stage Inhibits - Compressor Staging
Stage Inhibits - Compressor to Aux Heat
START INHIBIT
10 Minutes
Y1 “ON”
W1 “ON”
W1 “OFF”
LV = 100
LOAD VALUE (LV)
LV = 115
START INHIBIT
10 Minutes
Y1 “ON”
W1 “ON”
Y1 “ON”
45 Second
Cool Down
LV = 100
LOAD VALUE (LV)
LV = 125
Stage Inhibits - Duel Fuel
Note: Stage Thresholds do not apply to Variable Speed
Outdoor Unit operation.
Note: Stage Inhibits do not apply to Variable Speed
Outdoor Unit operation.
