Carrier 42 SERIES specifications Thermostatic Electric Valve Control, 2-PipeÐ

Thermostatic Fan Control, 2-Pipe System with Safety Cycle Ð This control is used for high humidity situations in which condensate problems can occur if fan is turned off while chilled water is still running through the coil.

The wiring provides fan cycling from HIGH to LOW on the cooling cycle and from LOW to OFF on the heating cycle. An ON-OFF toggle switch replaces the standard 3-speed fan switch. The toggle switch can be concealed to ensure that the unit runs on low speed when cooling. This action greatly reduces the chance of condensation problems that exist with other standard fan cycling controls.

For control package descriptions, see control components section entitled Remote-Mounted Controls and Unit-Mounted Controls.

For NOTES, see below.

UNIT		PACKAGE CODE*
	LOCATION	Heating and Cooling
TYPE
		Plus Changeover
Vertical	Unit Mounted	24-R
Vertical
or	Wall Mounted	23-17
Horizontal

* Packages listed on current price pages.

Thermostatic Electric Valve Control, 2-Pipe Ð

A thermostatically controlled 2-position valve provides su- perior control to fan cycling. With this control, the fan runs continuously unless it is manually switched to the OFF po- sition. The fan must be on before the valve can be opened to supply water to the coil.

This system can be used for normal 2-pipe changeover systems and can also be furnished for cooling-only or heating- only applications by omitting the changeover and specifying which application is intended.

For control package descriptions, see control components sections entitled Remote-Mounted Controls and Unit- Mounted Controls.

		THERMOSTAT OR
		WIRING PACKAGE*
UNIT	LOCATION	Heating or	Heating and	ELECTRIC
TYPE			Cooling	VALVE
		Cooling
			Plus
		Only
			Changeover²
Vertical	Unit	24-M,	24-L	Any 2- or
	Mounted	24-N		3-way,
				2-position
Vertical
	Wall	22-C, 22-D,		valve
or			22-A, 22-B	package.
	Mounted	22-E, 22-F
Horizontal

*Packages listed on current price pages. First 2 digits are item numbers.

²For alternate thermostat with manual changeover. Refer to current price pages.

NOTES:

1.Motors are thermally protected.

2.Use copper conductors only.

3.See unit nameplate for power supply. Provide disconnect means and overload protection as required.

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