Bard 357-93-E Specifiche Scaricare il pdf (Pagina 26)

Manual 2100-398C

Page 14 of 21

WIRING – MAIN POWER

Refer to the unit rating plate for wire sizing information

and maximum fuse or “HACR” type circuit breaker

size. Each outdoor unit is marked with a “Minimum

Circuit Ampacity”. This means that the field wiring

used must be sized to carry that amount of current.

Depending on the installed KW of electric heat, there

may be two field power circuits required. If this is the

case, the unit serial plate will so indicate. All models

are suitable only for connection with copper wire. Each

unit and/or wiring diagram will be marked “Use Copper

Conductors Only”. These instructions must be adhered

to. Refer to the National Electrical Code (NEC) for

complete current carrying capacity data on the various

insulation grades of wiring material. All wiring must

conform to NEC and all local codes.

The electrical data lists fuse and wire sizes (75° C

copper) for all models including the most commonly

used heater sizes. Also shown are the number of field

power circuits required for the various models with

heaters.

The unit rating plate lists a “Maximum Time Delay

Relay Fuse” or “HACR” type circuit breaker that is to

be used with the equipment. The correct size must be

used for proper circuit protection and also to assure that

there will be no nuisance tripping due to the momentary

high starting current of the compressor motor.

The disconnect access door on this unit may be locked

to prevent unauthorized access to the disconnect. To

convert for the locking capability, bend the tab located

in the bottom left-hand corner of the disconnect opening

under the disconnect access panel straight out. This tab

will now line up with the slot in the door. When shut, a

padlock may be placed through the hole in the tab

preventing entry.

See “Start Up” section for important information on

three phase scroll compressor start ups.

WIRING – LOW VOLTAGE WIRING

230/208V, 1 phase and 3 phase equipment dual primary

voltage transformers. All equipment leaves the factory

wired on 240V tap. For 208V operation, reconnect from

240V to 208V tap. The acceptable operating voltage

range for the 240 and 208V taps are:

TAP RANGE

240 253 – 216

208 220 – 187

NOTE: The voltage should be measured at the field power

connection point in the unit and while the unit is

operating at full load (maximum amperage

operating condition).

Five (5) wires should be run from thermostat subbase to

the 24V terminal board in the unit. A five conductor, 18

gauge copper, color-coded thermostat cable is

recommended. The connection points are shown in

Figure 8.

TABLE 3

THERMOSTAT WIRE SIZE

remrofsnarT

AVALFeguaGeriW

mumixaM

ecnatsiD

teeFnI

553.2

eguag02

eguag81

eguag61

egaug41

egaug21

001

061

052

TABLE 4

WALL THERMOSTAT

tatsomrehTserutaeFetanimoderP

750-3048

3511D0225HT

taeHegats1,looCegats1

elbammargorP-noNcinortcelE

revoegn

ahclaunaMrootuA

850-3048

1511D0225HT

taeHegats2,looCegats2

elbammargorP-noNcinortcelE

revoegnahclaunaMroot

060-3048

)544-0211(

taeHegats3;looCegats3

cinortcelEelbammargorP-noN/elbammargorP

lanoitnevnoCroPH

revoe

gnahclaunaMrootuA

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 49 50

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Bard 357-93-E Specifiche Pagina 26

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