Carrier 42BVC, 42BHC manual Thermostat Functions, Aux

Thermostats — Three thermostats are available for field installation:

Honeywell T834C manual changeover, single-stage heat thermostat features:

•off-cool-heat system switch

•on-auto fan mode switch

•single-stage electric heat

•outside air signal

Honeywell T8500 digital, automatic/manual changeover,

2-stage heat thermostat features:

•digital display of temperatures and all functions

•off-cool-heat-auto system mode buttons

•single speed fan operation

•on-auto fan mode button

•single or two stage electric heat signal

•outside air signal

•remote temperature sensor available

Sunne T170 single-stage heat, 2-pipe heat/cool auto changeover thermostat features:

•digital display of ambient temperature and operating mode

•single fan speed operation, power and operating mode buttons

•continuous fan operation, cycling water control valve

•4-pipe ACO/MCO (automatic changeover/manual changeover) with “on-auto” fan mode button

•one or 2 stage electric heat signal available

•purge cycle and temperature sensor for 2-pipe cold water/hot water systems

•programmable operating range, dead band, digital dis- play, temperature set-back

THERMOSTAT FUNCTIONS

				THERMOSTATS
SYSTEM		FUNCTION	CHANGEOVER	Honeywell	Honeywell	Sunne
				T834C	T8500	T170
2 Pipe		HW-Heat Only	ACO	—	X	X
2 Pipe		CW-Cool Only	ACO	—	X	X
2 Pipe		CW/HW	MCO	—	—	X
		Heat/Cool	ACO	—	—	X
		CW/HW	MCO	—	—	X
2 Pipe		Heat/Cool with	ACO	—	—	X
		Aux. Electric Heat
2 Pipe		CW-Cooling with	MCO	X	X	X
		Total Electric Heat	ACO	—	X	X
4 Pipe		CW/HW	MCO	X	X	X
		Heat/Cool	ACO	—	X	X
	LEGEND
ACO — Automatic Changeover
Aux	— Auxiliary
CW	— Chilled Water

HW — Hot Water

MCO — Manual Changeover

Valve packages — Valve packages are factory assembled for field installation. Motorized valves (24 v) can be operat- ed with power on with spring return or power off/power on.

It is recommended that basic motor controls are ordered when valve packages are ordered.

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