Carrier 42C,V Manual de instalación descargar pdf (Pagina 73)

hermostat 2-Pipe Total Electric Heat with Valve

Control — With this system, the complete heating require-

ment for the space is provided by the electric heater; the water

system is never changed over for heating. It is therefore possi-

ble, 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 or AUTO 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 whenever the

heater is on. No changeover device to sense water temperature

is necessary.

NOTE: Wiring diagrams are for typical applications. If other

voltages for heaters or controls are specified, wiring may differ

from that shown. See Fig. 89 for line voltage control. See

Fig. 90 and 91 for 24-v control. Refer to wiring diagram on

unit blower housing for unit specific wiring.

Fig. 89 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Cooling with Total Electric Heat —

Remote/Wall-Mounted Thermostat (Line Voltage)

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 87 88

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Carrier 42C,V Manual de instalación Pagina 73