Carrier 06D specifications Crankcase Heater Overload Relay Control Relay, Ground Connection Switch

Compressor Unit Connections — Extend power leads from control center (contactor terminals) to compressor terminal box and make connections as shown in Fig. 4.

Terminals 8 and 9 on motor terminal plate are for internal protector connections. As shown in Fig. 4, run a wire from ter- minal 9 to terminal 6 on TB2 in control center and a wire from terminal 1 on OL2 to terminal 2 on HPS in control center.

Run crankcase heater power wiring into control center. Connect leads to terminal 5 on pumpout relay and terminal 3 on terminal block TB2. See Fig. 5.

Affix power warning label supplied in the installer’s packet to fused disconnect which energizes crankcase heater (see unit label diagram).

LEGEND

HPS — High-Pressure Switch

OL — Overload Relay

TB — Terminal Block

Factory Wiring

Fig. 4 — Compressor Terminal Diagram

LEGEND

C— Contactor, Compressor NEC — National Electrical Code

CH	— Crankcase Heater	OL	— Overload Relay
CR	— Control Relay	OPS	— Oil Pressure Switch
FU	— Fuse	POR	— Pumpout Relay
GND	— Ground Connection	SW	— Switch
HPS	— High-Pressure Switch	TB	— Terminal Block
IP	— Internal Protector	TM	— Timer Motor
LPS	— Low-Pressure Switch	TR	— Timer Relay

NOTES:

1.Factory wiring is in compliance with NEC. Any field modifications or additions must be in compliance with all applicable codes. Use copper, copper-clad aluminum for field power supply only.

2.Field power supply wiring must be 75 C minimum.

3.Compressor thermally protected. Three-phase motors are protected against primary single-phasing condition.

4.Pilot duty control must be field supplied. Minimum contact rating must be 25 va.

5.60 Hz units have 120-volt control circuit. 50 Hz units have 230-volt con- trol circuit. A separate source of supply at the correct voltage must be field supplied thru a fused disconnect device with a max rating of 15 A to TB2 connections L1 (Hot Side) and L2 (Neutral).

6.Open control circuit disconnect switch for servicing only. Disconnect must remain closed for crankcase heater to operate.

7.A transformer of the following rating may be field supplied for 60 Hz units: 350 va.

8.Transformer must be fused and grounded per applicable codes.

9.If any of the original wiring furnished must be replaced, it must be replaced with 90 C wire or its equivalent.

CONTROL WIRING — Control circuit power is 115 volts, energized from an external source or from unit voltage through field-supplied transformer. Transformer size required is 350 va for 60 Hz units. External control power source must be supplied through a 15-amp fused disconnect. Connect control circuit power leads to terminal block TB2, terminals L1 and L2. Terminal L2 is neutral potential (ground).

Compressor Protection — The 06D and 07D units are factory wired for single-pumpout control. Field addition and wiring of line voltage remote control and liquid line solenoid valve is required. (See unit Fig. 3 and Fig. 6.) Remote control minimum contact rating must be 25 va. Solenoid valve must have a maximum load rating of 50 va holding; 200 va inrush. For applications with cooling tower, air-cooled or evaporative condensers, add necessary auxiliary contacts in line between compressor contactor and terminal A1 on timer. Insert desired interlocks and overloads between terminals 5 and 9 on terminal block TB2.

Control wiring may be modified as shown in Fig. 6 for automatic pumpdown control; remove low-pressure switch between timer relay and terminal 4 on TB2. Wire low-pressure switch between terminals 9 and 6 on TB2. Add necessary auxiliary contacts between compressor contactor and terminal A1 on timer. Remove wire between terminal 6 on TB2 and terminal 3 on pumpout relay. Insert required interlocks and overloads between terminals 5 and 9 on TB2.

Limitations — Do not use automatic pumpdown control on direct expansion cooler applications or when compressors are equipped with pressure-type unloader valves. Pressure unloader valves have built-in high to low passage which allows compressor to cycle with automatic pumpdown.

Fig. 5 — 06D/07D Control Box Components and Connections (3-Phase)

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