Carrier 48HC 04-28 - APPENDIX B - CONTROL MODES WITH HUMIDI-MIZER SYSTEM AND ECONOMIZER; Table M - Single-Circuit Units; Table N - Dual Circuit Units 1-Stage Y1 and 2-Stage Y1; Table O - Dual Circuit Units Digital

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APPENDIX B — CONTROL MODES WITH HUMIDI-MIZER SYSTEM AND ECONOMIZER
Thermostat input shown for cooling demand (versus tempera-
ture sensor and set point). Humidistat input shown for dehu-
midification demand (versus relative humidity sensor and set
point). Economizer cooling availability is dependent on out-
door temperature or enthalpy. See Tables M-O.
Circuit Subcooling mode = REHEAT 1
Circuit HGRH mode = hot gas reheat = REHEAT 2
Circuit ON mode = normal cooling
Thermostat Control type configuration = 0 = Adaptive, or Unit
Control Type configuration = 3 = Space Temperature, for Dual-
circuit units results in added staging timers and flex between 1-
stage Y1 and 2-stage Y1.
Table M — Single-Circuit Units (Thermostat Control Type Configuration is Ignored)
Table N — Dual Circuit Units 1-Stage Y1 (Thermostat Control Type configuration = 1) and 2-Stage Y1
(Thermostat Control Type Configuration = 2)
Table O — Dual Circuit Units Digital (Thermostat Control Type Configuration = 3)
ECONO AVAILABLE? Y1 Y2 HUMIDISTAT CIRCUIT A ECONOMIZER
NO
OFF OFF LOW OFF Min. Position (Econo closed if fan off)
OFF OFF HIGH HGRH Min. Position
ON OFF HIGH Subcooling Min. Position
OFF ON HIGH Subcooling Min. Position alarm T411: Y2 without Y1
ON ON HIGH Subcooling Min. Position no alarm
ON OFF LOW ON Min. Position
OFF ON LOW ON Min. Position alarm T411: Y2 without Y1
ON ON LOW ON Min. Position no alarm
YES
OFF OFF LOW OFF Min. Position (Econo closed if fan off)
OFF OFF HIGH HGRH Min. Position
ON OFF HIGH Subcooling Min. Position
OFF ON HIGH Subcooling Min. Position alarm T411: Y2 without Y1
ON ON HIGH Subcooling Min. Position no alarm
ON OFF LOW OFF or ON Cooling
OFF ON LOW OFF or ON Cooling alarm T411: Y2 without Y1
ON ON LOW OFF or ON Cooling no alarm
ECONO AVAILABLE? Y1 Y2 HUMIDISTAT CIRCUIT A CIRCUIT A ECONOMIZER
NO
OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
OFF OFF HIGH HGRH HGRH Min. Position
ON OFF HIGH Subcooling HGRH Min. Position
OFF ON HIGH Subcooling Subcooling Min. Position alarm T411: Y2 without Y1
ON ON HIGH Subcooling Subcooling Min. Position
ON OFF LOW ON ON Min. Position
OFF ON LOW ON ON Min. Position alarm T411: Y2 without Y1
ON ON LOW ON ON Min. Position
YES
OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
OFF OFF HIGH HGRH HGRH Min. Position
ON OFF HIGH Subcooling HGRH Min. Position
OFF ON HIGH Subcooling Subcooling Min. Position alarm T411: Y2 without Y1
ON ON HIGH Subcooling Subcooling Min. Position
ON OFF LOW OFF or ON OFF Cooling
OFF ON LOW OFF or ON OFF or ON Cooling alarm T411: Y2 without Y1
ON ON LOW OFF or ON OFF or ON Cooling
ECONO AVAILABLE? Y1 Y2 HUMIDISTAT CIRCUIT A CIRCUIT A ECONOMIZER
NO
OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
OFF OFF HIGH HGRH OFF Min. Position
ON OFF HIGH HGRH HGRH Min. Position
OFF ON HIGH Subcooling HGRH Min. Position
ON ON HIGH Subcooling Subcooling Min. Position
ON OFF LOW ON OFF Min. Position
OFF ON LOW ON ON Min. Position
ON ON LOW ON ON Min. Position
YES
OFF OFF LOW OFF OFF Min. Position (Econo closed if fan off)
OFF OFF HIGH HGRH OFF Min. Position
ON OFF HIGH HGRH HGRH Min. Position
OFF ON HIGH Subcooling HGRH Min. Position
ON ON HIGH Subcooling Subcooling Min. Position
ON OFF LOW OFF or ON OFF Cooling
OFF ON LOW OFF or ON OFF or ON Cooling
ON ON LOW OFF or ON OFF or ON Cooling