Carrier 38ED User Manual download pdf (Page 6)

See Table 4 for recommended wire and fuse sizes.

When making electric connections, provide clear

ance at unit for refrigerant piping connections.

INSTALL A BRANCH CIRCUIT DISCONNECT

PER NEC of adequate size to handle unit starting

current. Locate disconnect within sight from and

readily accessible from the unit, per section 440-14

of National Electrical Code (NEC).

ROUTE LINE POWER LEADS INTO UNIT —

Extend leads from disconnect thru power wiring

hole provided (see Fig. 1) and into unit splice area.

Remove top cover to gain access to unit wiring.

CONNECT GROUND LEAD AND POWER

WIRING — Connect ground lead to a ground lug in

control box for safety. Then connect power wiring.

See Fig. 6. Splice line power leads to yellow and

black pigtails. Use wire nuts and tape at each con

nection. Connect unit wiring to copper or copper-

clad aluminum power wiring. Do not connect to

aluminum wiring.

I-PHASE

CONN. TO

DISCONNECT

PER NEC

■

-------

GROUND LEAD-KDGROUNDING LUG

BLK

-----------

-YEL-

I-PHASE

CONO UNIT

Splice Connections

Field Wiring

Factory Wiring

Fig. 6 — Line Power Connections

CONNECT CONTROL POWER WIRING —

Route 24-v control wires thru control wiring hole

and connect to pigtails supplied with unit (Fig. 1).

Splice control leads to black and blue pigtails on all

units. See Fig. 5.

Use a furnace or fan coil transformer as 24-v

(60-va minimum) supply for system as shown in Fig. 5

or use accessory transformer shown in Table 3).

START-UP

1. Backseat (open) liquid and suction line service

valves.

2. Set thermostat selector switch at OFF.

3. Set room thermostat at desired temperature.

Be sure this temperature is below indoor ambient

temperature.

4. Energize electrical disconnects for entire system.

5. Set room thermostat at COOL and fan switch at

FAN or AUTO, as desired. Operate unit for 15

minutes; then cheek system refrigerant charge.

See Refrigerant Charging, this page.

Motors and controls are designed to operate satis-

faetorily in the voltage range shown in Table 4. If

necessary to use manifold gages for servicing, refer

to Carrier Standard Service Techniques Manual,

Chapter 1, Refrigerants, page 1-5, Fig. 8 for bypass

method of returning charge to system. Removal of

liquid line charging hose without following these

precautions could result in some loss of eharge.

Refrigerant Charging

Condensing units contain correct operating

charge for complete system when connected to

Carrier-approved evaporators of same capacity as

condensing unit with 25 ft or less of Carrier acces

sory tubing or field-supplied tubing of recommended

size. For every 10 ft of liquid line of recommended

size over 25 ft, add refrigerant charge as follows:

.4 lb for 3/8-in. line; .28 lb for 5/ 16-in. line. On all

other systems, adjust charge for correct operation

as applicable.

Service port connections are provided on liquid

and suction line service valves for evacuation and

charging. See Fig. 1.

TO CHECK, ADJUST OR REPLACE REFRIG

ERANT CHARGE use method recommended in

Table 5. Details of charging methods are listed

below.

Before recharging system, thoroughly evacuate

system and then weigh in refrigerant charge speci

fied in Table 6. Check or adjust charge as required.

Refer to Carrier Standard Service Techniques

Manual, Chapter 1, Refrigerants, for additional

system evacuation and dehydration instructions.

WEIGHT METHOD — Refer to Table 6 or unit

nameplate for correct system refrigerant charge.

Remove any refrigerant remaining in system before

recharging.

When system is not evaeuated, subtract the

following amount from total charge.

38ED018 thru 036 — .10 lb (1.6 oz)

38ED042 thru 060 — .20 lb (3.2 oz)

The Dial-a-charge charging cylinder is an accu

rate device used to recharge system by weight. These

cylinders are available at refrigeration supply firms.

CHARGING CHART METHOD — Use Charging

Chart, Fig. 7, and the following procedure.

1. Operate unit a minimum of 10 minutes before

checking charge.

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Carrier 38ED User Manual Page 6

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