Carrier 42 SERIES specifications

Thermostatic 2-Pipe Total Electric Heat with- Valve Control Ð With this system, the complete heat- ing requirement for the space is provided by the electric heater; the water system is never changed over for heating. It is there- fore possible, just as with 4-pipe systems, to have heating or cooling at any time of the year.

The fan runs continuously unless it is manually switched to OFF position. Fan must be on before thermostat can send signal to open chilled water valve or turn on electric heater.

Normally, an automatic changeover thermostat with a dead band between heating and cooling is used, but a manual

changeover thermostat is also suitable. A 2-way or 3-way valve must also be used so that the chilled water is off when- ever the heater is on. No changeover device to sense water temperature is necessary.

NOTE: Wiring diagrams are for 120-v power supply. If other voltages for heaters or controls are speci®ed, wiring may dif- fer from that shown.

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

UNIT	LOCATION	WIRING PACKAGE*		ELECTRIC
TYPE		Automatic System	Manual System	VALVE
Vertical	Unit	24-Q	Available on Special Order.
	Mounted			Any 2- or 3-way,
Vertical		22-J, 22-K,		2-position valve
or	Wall Mounted		23-15, 23-16	Package.
		23-09, 23-10
Horizontal

*Packages on current price pages.

NOTES:

1.Motors 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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