STANDARD WIRING PACKAGES (cont)

Thermostatic Valve Control, 4-Pipe Ð The 4-pipe system provides the ultimate in economy and room tem- perature control. Both hot water and chilled water are avail- able at any time.

Normally an automatic changeover thermostat is used, but a manual changeover thermostat is also suitable. Two 2-way valves, two 3-way valves, or one 2-way plus one 3-way valve must be selected. An automatic changeover device to sense water temperature is not required.

With this system, the fan runs continuously unless it is manually switched to OFF position. Fan must be on before thermostat can send signal to open the chilled water or hot water valve.

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 TYPE

LOCATION

WIRING PACKAGE*

ELECTRIC

Automatic System

Manual System

VALVE

 

 

Vertical

Unit Mounted

24-P

Available on Special Order.

Any 2- or 3-way,

Vertical

 

 

 

 

22-G, 22-H,

 

2-position valve

or

Wall Mounted

23-13, 23-14

23-07, 23-08

package.

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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Carrier 42 SERIES specifications Unit Type Location Wiring Package Electric

42 SERIES specifications

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