Carrier 40KMQ Especificaciones descargar pdf (Pagina 19)

WIRING THE ROOM CONTROLLER — The room con-

troller is capable of controlling from 1 to 6 fan coil units. The

total run length of the wire connecting the room controller to

the fan coil units should be kept to under 500 feet. Wire the

room controller to the unit using daisy chain wiring. See

Fig. 28. The room controller connects to the receiver board

connection on the electronic board inside the unit.

Wiring the Power Connection to the Room Controller

— The

thermostat will be powered by unregulated nominal 12.5 volts

DC (10V min to 20V max) which is provided by the electronic

board inside the unit. The power consumption will be 50 mA

12.5 volts DC. For applications where more than one fan coil

unit is to be controlled, the fan coil unit closest to the room

controller will be the only one that supplies power to the room

controller. The control should be protected from damage in

case of accidental wiring of power, ground and signal wiring

occurs.

Wiring the Room Controller to the Indoor Unit

— Loosen

the screws of terminals P (DC Power), G (GROUND) and C

(SIGNAL) on the indoor unit and room controller terminal

blocks. Refer to Fig. 29 and connect the indoor unit terminal

block to the room controller terminal block.

INSTALLATION OPTIONS

The 40KMC,KMQ units can be used to cool an adjacent

room or for fresh-air ventilation. Plan the installation carefully.

Measure carefully and follow acceptable building practices and

the National Electric Code (NEC).

Fresh Air Intake

1. Using Fig. 30, locate and remove the factory-installed in-

sulation from the side of the unit where the prepunched

knockouts are located.

2. Remove the pre-punched knockouts for fresh air intake.

Refer to Fig. 30. Be careful not to damage internal parts

such as the heat exchanger coil.

3. If installing a 40KMC018 unit, install baffle. Refer to

Fig. 30.

4. Install ductwork using field-supplied, insulated flex duct,

or insulated sheet metal suitable for working tempera-

tures up to 140 F. Conduits can be of flexible polyester

(with spiral core) or corrugated aluminum, externally

covered with anti-condensate material (fiberglass from

in. to 1 in. thickness).

5. Use Fig. 31 to determine the allowable static pressure loss

for the ductwork airflow. The ductwork design must not

exceed this value or the job airflow requirements will not

be met.

6. Use a field-supplied fan if airflow does not meet job re-

quirements. The field-supplied fan motor for outside air

intake must be controlled by a bipolar ON/OFF switch

with safety fuses.

7. Install an air inlet grille with filter inspection port to pre-

vent dust and dirt from entering and fouling the indoor

unit heat exchanger. Filter installation also makes the in-

stallation of a duct closing damper during shutdown peri-

ods unnecessary.

8. All non-insulated ducts must be covered with anti-

condensate insulation (such as expanded neoprene,

in.

thickness).

Conditioned Air Supply to Adjacent Room —

Air supply to an adjacent room requires that the outlet corre-

sponding with the duct is closed, using the air supply outlet

obstruction accessory kit.

NOTE: The accessory kit cannot be used in units equipped

with an electric heater.

An air inlet grille must be fitted (if possible near the floor)

between the air conditioned room (where the unit is situated)

and the adjacent room or, alternatively, the door must be under-

cut, as shown in Fig. 30. The duct lengths can be calculated in

accordance with Fig. 30, also taking into account the pressure

drop through air diffusers and fresh air filters.

IMPORTANT: Ventilated air must not exceed 10% of the

total airflow or problems with operation will result. If the

ventilated air surpasses 10% of the total airflow, a field-

supplied primary air treatment system with separate deflec-

tors is recommended.

IMPORTANT: DO NOT use active carbon or electrostatic

filter kits for ducts towards adjacent rooms.

REMOTE

FCU 6

FCU 3

FCU 2

FCU 1

Indoor unit

R oom C ontroller

Diagram 1

Main electronic card

4 pins terminal block placed on external

control box

Wires supplied by the installer

Terminal block in the R oom C ontroller

Red

B lack

White

R emote connector

(J5) 5 pins

Fig. 29 — Wiring the Room Controller to

the Indoor Unit

Fig. 28 — Room Controller Daisy Chain Wiring

(Multidrop)

1 2 ... 14 15 16 17 18 19 20 21 22 23 24

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