Installation 13 – Emerson Precision Cooling For Business-Critical Continuity Figure i User Manual

Page 17

Installation

Figure 11 Three-phase, 8 ton model schematic, typical

See Note 6

See Note 8

See Note 7

See Note 8

See Note 1

See Note 6

C1 Aux.

C2 Aux.

HP1

HP2

HP3

RHTR1

RHTR2

HP4

1C1

2C1

3C1

HG1

HGSV1

LLSV1

BR BR BR

1MF 2MF 3MF

BR R OR

T3 T2 T1

COMP1

T3 T2 T1

COMP

BR R OR

1C2

2C2

3C2

HG2

HGSV2

LLSV2

TX1

NOTES
1. Transformer TX1 provided on units with nameplate voltages greater than 250V.
2. Use copper conductors only. See unit nameplate for main supply wire sizing data.
Wire per local codes.
3. A remote disconnect switch is to be field-supplied and mounted within sight of the
condensing unit. See unit nameplate for voltage and amperage.
4. All motors have internal line break overload protectors.Three-phase motors
protected for primary single-phasing conditions.
5. Terminals 1 thru 8 are for connection of control circuit from evaporator unit.
(Terminals 4 and 8 are not used by some evaporator models . See Note 7). Wiring by
others to be NEC Class 2 and sized for 1V maximum drop.
6. Connection to Terminals 3 and 7 is used for high head alarm input connection in
evaporator unit.
7. Connection to Terminals 4 and 8 is required only on models with (HGBP) hot gas
bypass control signal output in evaporator unit.
8. Wires 1, 5 and 9 are separately connected to the grounded side of the 24V
Class 2 circuit. Do not connect them together.

STANDARD DEVICES
C1 - Compressor Contactor 1
C2 - Compressor Contactor 2
CHTR1 - Compressor Heater 1
CHTR2 - Compressor Heater 2
COMP1 - Compressor #1
COMP2 - Compressor #2
F1 - Transformer Fuse
F2 - Transformer Fuse
FM - Fan Motor
HP1 - High Pressure Switch 1
(Auto Reset)
HP2 - High Pressure Switch 2
(Auto Reset)
HP3 - Pressure Switch 3
Receiver (Auto Reset)
HP4 - Pressure Switch 4
Receiver (Auto Reset)
LLSV1 - Liquid Line Solenoid Valve 1
LLSV2 - Liquid Line Solenoid Valve 2
MF - Fan Motor Contactor
RHTR1 - Receiver Heater No.1
RHTR2 - Receiver Heater No.2
TX1 - Transformer Line Voltage to 230V
OPTIONAL DEVICES
HG1 - Hot Gas Relay 1
HG2 - Hot Gas Relay 2
HGSV1 - Hot Gas Solenoid 1
HGSV2 - Hot Gas Solenoid 2

WIRING LEGEND
Factory-supplied line voltage
Field-installed line voltage wiring
Optional line voltage wiring
Factory-supplied 24V NEC Class 2 wiring
Optional 24V wiring
Field-supplied 24V NEC Class 2 wiring
Field-supplied earth grounding wire
Pigtail leads
Terminal strip connection

Grounding lug connection

WIRE COLOR CODE
OR - Orange
R - Red
BR - Brown
P - Purple
GN - Green

Y - Yellow
BL - Blue
BK - Black
W - White

Insulation Color

GN / Y

Tracer Color

COMP2

Conductors Field-Supplied

(See Note 5)

Evaporator Unit

HIGH HEAD 1

24V GND

COMP1

HGBP1

HIGH HEAD 2

COOLING 2

COOLING 1

HGBP2

OUTDOOR CONDENSING MODULE

3-Phase Line
Voltage Supply
By Others
(See Notes 2 and 3)

Earth Ground
By Others

CHTR1

CHTR2

Fan

Motor

HG2

HG1