Carrier 30GTN015-035 installation instructions Make Electrical Connections, Compressor Mounting

NOTE: All dimensions are in inches.

	Liquid Chiller
IN	OUT

WATER INLET	WATER OUTLET
(RETURN WATER)	(LEAVING WATER)

Fig. 6 — Compressor Mounting

power to the Main Base Board (MBB) is off. They are protected by a 7-amp fuse in field-supplied control power supply disconnect.

3.The control circuit field-supplied disconnect should never

	be off except when unit is being serviced or is to be down
U.N.2857	for a prolonged period, in which case cooler should be
REFRIGERATING
MACHINE
	drained. When operation is resumed, crankcase heater
	should be energized for 24 hours before start-up.

4.	Power entry is at one end only.
5.	Maximum field wire sizes allowed by lugs on terminal
	block are:
WATER	350 kcmil for 30GTN030,035 (208/230-3-60) and
	30GTN030 (230-3-50) units.
DRAIN

Fig. 7 — Water Connection Locations

Step 4 — Make Electrical Connections

POWER SUPPLY — Electrical characteristics of available power supply must agree with unit nameplate rating. Supply voltage must be within limits shown in Tables 3A and 3B.

IMPORTANT: Operating unit on improper supply volt- age or with excessive phase imbalance constitutes abuse and may affect Carrier warranty.

2/0 AWG for all other units.

6.Terminals for field power supply are suitable for copper, copper-clad aluminum, or aluminum conductors. Insula- tion must be rated 167 F (75 C) minimum.

Field Connections

Main Power — Bring wires from the fused disconnect switch through hole in bottom rail of unit to control box (Fig. 3-5) and connect to terminals on terminal block TB1 (See Fig. 8).

Control Power — Bring separate source power (see Fig. 8, note 2) into unit as shown in Fig. 3-5. This supplies power for control circuit, compressor crankcase heater, and cooler heater.

POWER WIRING — All power wiring must comply with ap- plicable local and national codes. Install field-supplied branch circuit fused disconnect(s) per NEC (National Electrical Code, U.S.A.) of a type that can be locked OFF or ON. Disconnect(s) must be within sight from and readily accessible from unit in compliance with NEC Article 440-14.

General Wiring Notes

1.The control circuit power must be from a separate source and must be brought through a field-supplied fused dis- connect rated at 15 amps for 230-v and 30 amps for 115-v control power. Two terminal blocks are provided for field-wired control devices.

2.Crankcase and cooler heaters are wired in the control cir- cuit so they are always operable as long as the control power disconnect is on and safety device is open or the Enable-Off-Remote contact switch is in the Off position. Heaters are wired so that they are energized even when

Connect incoming wires to TB4 in unit control box (L1 to and L2 to ). Neutral side must be connected to the neutral

terminal block (by C-A1) for 380-3-60 and 400-3-50 V units only. In the auxiliary power supply a field-supplied disconnect with 15-amp circuit protection must be provided to accommo- date crankcase heater and cooler heater cable.

To comply with NEC Article 440-14, the disconnect must be located within sight from and readily accessible from unit.

IMPORTANT: To ensure power to the heaters, make sure auxiliary power to unit is always on (except for servicing or prolonged shutdown).

A toggle switch (marked Emergency On-Off on the unit label diagram and by the switch) allows the control circuit to be manually disconnected when necessary. This switch does not affect the crankcase heater and cooler heater cable.

7