Carrier 50PG03-07 Specifikace stáhnout pdf (Strana 9)

Step 7-- Make Electrical Connections

FIELD POWER SUPPLY -- All 2081230-v units are factory

wired for 230-v power supply. If the 2081230-v unit is to be

connected to a 208-v power supply, the transformer must be m-

wired by moving the black wire with the l/4-in, female quick

connect from the 230-volt connection and moving to the

200-volt l/4-in, m_de temfinal on the prma U side of the

transfonnel:

Refer to unit label diagram for additional infonnaion.

All field wirng must comply with NEC (National Electrical

Code) and local codes. Size wire based on MCA (Minimum

Circuit Amps) on the unit informaive plae. Leads am provided

for field wire connections. Use UL (Underwrters' Laborato-

res) approved copper/aluminum connectol:

When installing units, provide safety disconnect per NEC

Article 440 or local codes. For non-lused disconnects, size the

disconnect according to the sizing data provided in the electri-

cal daa tables. If a fused disconnect is used, determine the

minimum size for the switch based on the disconnect sizing

data provided in the electrical data tables and then coordinate

the disconnect housing size to accommodate the Maximum

Overcurrent Protection (MOCP) device size as marked on the

unit informative plate. See Tables 2A and 2B.

See Fig. 8 for power wiring connection to unit leads and

equipment ground.

Route power and ground lines through control box end

panel or unit basepan (see Fig. 3) to connections as shown on

unit wiring diagram and Fig. 8. Make sure that there is a

watertight seal when penetrating the cabinet. Factory leads

may be wired directly to the disconnect.

The correct power phasing is critical to the operation of the

scroll compressors. An incorrect phasing will result in an

alarm being generated and compressor operation lockout.

Should this occur, power phase correction must be made to

the incoming powel: Damage to compressor could result.

Unit cabinet must have an uninterrupted, unbroken electri-

cal ground to minimize the possibility of personal injury if

an electrical fault should occm: This ground may consist of

electrcal wire connected to unit ground lug in control com-

partment, or conduit approved for electrical ground when

installed in accordance with NEC; ANSI/NFPA (American

National Standards Institute/Natiomd Fire Protection Asso-

ciation), latest edition, and local electric_d codes. Failure to

follow this wmning could result in the installer being liable

for personal injury of others.

Field wiring must conform to temperature limitations for

type "T" wire. All field wiring must comply with NEC and

local requirements.

Operating voltage to compressor must be within voltage

range indicated on unit nameplate. On 3-phase units, voltages

between phases must be balanced within 2%.

Unit failure as a result of operation on improper line voltage

or excessive phase imbalance constitutes abuse and may cause

damage to electrical components.

FIELD CONTROL WIRING -- Unit can be controlled with

a cmrer-approved accessoly thermostat. Inst_dlthermostat ac-

cording to the inst_dlation instructions included with accessory.

Ix_cate thermostat assembly on a solid interior wall in the

conditioned space to sense average temperature.

Route fllermostat cable or equivalent single leads of colored

wire from subbase terminals through conduit into unit to

low-voltage connections as shown on unit label wiring diagram

and in Fig. 9.

If bottom entU is used, seal the hole in the grommet of the

control box with RTV se_dant.

NOTE: For wire runs up to 50 It, use no. 18 AWG (American

Wire Gage) insulated wire (35 C minimum). For 50 to 75 It,

use no. 16 AWG insulated wire (35 C minimum). For over

75 It, use no. 14 AWG insulated wire (35 C Minimum). All

wire larger than no. 18 AWG cannot be directly connected at

the thermostatand will require a junction box and splice at the

thermostat.

Set heat anticipator settings as follows:

STAGE 1

VOLTAGE (Wl) ON

All 0.2

STAGE 1 AND 2

(Wl AND W2) ON

0.4

Settings may be changed slightly to provide a greater degree

of comfort for a particulm installation.

F--

(DO-

FIELD ,=_ FACTORY

POWER ,__ POWER

WIRING WIRING

C.A1

EQUIP GND

LEGEND

C.A1 -- Compressor Contactor (A1)

EQUIP -- Equipment

GND -- Ground

NEC -- National Electrical Code

NOTE: The maximum wire size for C.A1 is 2/0.

Fig. 8 -- Field Power Wiring Connections

THERMOSTAT ASSEMBLY

REMOVABLE JUMPER

[_ I I I

TB1 I [] [] []

I I I I

Fig. 9 -- Field Control Thermostat Wiring

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 48 49

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