Carrier 42C,V Manual de instalación descargar pdf (Pagina 67)

Aquastat

— The aquastat must be able to sense whether the

flowing water is being chilled or heated and switches a contact

closed to provide automatic summer or winter changeover for

the system. When a two-pipe cooling/heating system with

optional auxiliary electric heat is desired, an additional aqua-

stat is required.

Units with optional factory furnished and installed aquastats

may be shipped with aquastats mounted on the coil stub out. In

this situation, remove the aquatat before valve package installa-

tion. Refer Fig. 70 for factory piping diagram for proper loca-

tion when reinstalling the aquastats. If the valve package is

field supplied,the aquastat must be installed in a location where

it will sense the water temperature regardless of control valve

position. A bleed bypass should be provided for proper opera-

tion of aquastat. The bleed line allows a small amount of water

to flow from supply to return piping when the control valve is

closed for loop temperature sensing.

All field wiring must be in accordance with governing

codes and ordinances. Any modification of unit wiring without

factory authorization will invalidate all factory warranties and

nullify any agency listings. The manufacturer assumes no re-

sponsibility for any damages and/or injuries resulting from im-

proper field installation and/or wiring.

Units may be equipped with line voltage controls or

24 VAC control systems. The following descriptions are for

typical control sequences only. For detailed control operating

sequence, refer to thermostat operating instructions.

STANDARD WIRING PACKAGES

anual Fan Control — On vertical cabinet units, a fan-speed

switch may be furnished unit-mounted and wired. See Fig. 80.

On vertical furred-in units and horizontal units, the switch may

be shipped separately on a decorative wall plate for field

mounting and wiring. See Fig. 81.

The standard switch has LOW, MEDIUM, HIGH and OFF

positions plus an auxiliary contact to energize thermostats,

valves, dampers, etc.

NOTE: Wiring diagrams are for typical applications. If other

voltages for heaters or controls are specified, wiring may differ

from that shown. Refer to wiring diagram on unit blower hous-

ing for unit specific wiring.

hermostatic Electric Valve Control, 2-Pipe — A thermo-

statically controlled 2-position valve provides superior control

to fan cycling. With this control, the fan runs continuously un-

less it is manually switched to the OFF or AUTO position. 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 ap-

plications by omitting the changeover and specifying which

application is intended. See Fig. 82 and 83 for line voltage con-

trol. See Fig. 84 and 85 for 24-v control. Wiring diagrams show

typical applications. Refer to wiring diagram on unit blower

housing for unit specific wiring.

IMPORTANT: Wiring diagrams shown depict typical

control functions. Refer to unit wiring label for specific

functions.

Fig. 80 — No Controls — Unit-Mounted 3-Speed Switch Only

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 87 88

Comentarios a estos manuales

Sin comentarios

Carrier 42C,V Manual de instalación Pagina 67

Comentarios a estos manuales

Relacionado con productos y manuales para Acondicionadores de aire del sistema de división Carrier 42C,V