Carrier 42C,V Installationshandbuch PDF herunterladen (Seite 75)

hermostatic Valve Control, 4-Pipe — The 4-pipe system

provides the ultimate in economy and room temperature con-

trol. Both hot water and chilled water are available 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/AUTO position. Fan must be on be-

fore thermostat can send signal to open the chilled water or hot

water valve.

NOTE: Wiring diagrams are for typical applications. If other

voltages for heaters or controls are specified, wiring may differ

from that shown. See Fig. 92 for line voltage control. See

Fig. 93 and 94 for 24-v control. Refer to wiring diagram on

unit blower housing for unit specific wiring.

Fig. 92 — 42C,S,V (except VG), and 42D (600-1000 cfm) 4-Pipe Heating and Cooling —

Remote/Wall-Mounted Thermostat (Line Voltage)

ONLY 120V WHT/ALL

OTHERS BLK

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Carrier 42C,V Installationshandbuch Seite 75