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7

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.

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

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
for a prolonged period, in which case cooler should be
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:
350 kcmil for 30GTN030,035 (208/230-3-60) and
30GTN030 (230-3-50) units.
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.
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.

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.

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

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

NOTE: All dimensions are in inches.

Fig. 6 — Compressor Mounting

Liquid Chiller

OUT

IN

REFRIGERATING

MACHINE
U.N.2857

WATER INLET
(RETURN WATER)

WATER OUTLET
(LEAVING WATER)

WATER
DRAIN

Fig. 7 — Water Connection Locations

Summary of Contents for 30GTN015

Page 1: ...h and fire extinguisher nearby when brazing Use care in handling rigging and setting bulky equipment See Tables 1A and 1B for Physical Data INSTALLATION Step 1 Rig and Place the Unit RIGGING Preferred...

Page 2: ...Tube Direct Expansion Net Water Volume gal L 6 8 25 7 9 9 37 5 12 8 48 4 Maximum Design Working Pressure psig kPa Refrigerant Side 235 1620 Water Side 150 1034 WATER CONNECTIONS in Inlet and Outlet 2...

Page 3: ...pe power source with a warning that power must not be turned off except when unit is being serviced The cooler drain connection is at the opposite end from the compressor See Fig 3 5 Insulate the drai...

Page 4: ...b Kg 30GTN015 1640 744 30GTN015C 1732 786 30GTN020 1821 826 30GTN020C 1945 882 50 Hz UNIT Lb Kg 30GTN015 1741 790 30GTN015C 1833 831 30GTN020 1864 846 30GTN020C 1988 902 UNIT A 30GTN015 1219 4 0 30GTN...

Page 5: ...unit is 60 Hz UNIT Lb Kg 30GTN025 2170 984 30GTN025C 2324 1054 30GTN030 2268 1029 30GTN030C 2474 1122 50 Hz UNIT Lb Kg 30GTN025 2193 995 30GTN025C 2347 1065 30GTN030 2332 1058 30GTN030C 2538 1151 LEG...

Page 6: ...nit 2 Dimensions in are in millimeters 3 The approximate operating weight of the unit is 60 Hz UNIT Lb Kg 30GTN035 2965 1345 30GTN035C 3273 1485 LEGEND C Copper Coils COMPR Compressor MTG Mounting NEC...

Page 7: ...lock are 350 kcmil for 30GTN030 035 208 230 3 60 and 30GTN030 230 3 50 units 2 0 AWG for all other units 6 Terminals for field power supply are suitable for copper copper clad aluminum or aluminum con...

Page 8: ...342 51 1 80 198 8 60 230 60 198 254 15 380 415 50 342 440 60 5 100 229 0 80 230 50 198 254 15 025 208 230 60 187 253 124 7 200 458 4 150 115 60 104 127 30 460 60 414 506 60 7 100 229 2 80 115 60 104...

Page 9: ...80 60 418 342 51 1 80 198 8 60 230 60 198 254 15 380 415 50 342 440 63 0 100 231 5 80 230 50 198 254 15 025 208 230 60 187 253 124 7 200 458 4 150 115 60 104 127 30 460 60 414 506 60 7 100 232 3 80 11...

Page 10: ...diagram 5 For GCS accessory remove jumper wire between terminals 5 and 8 on terminal block TB2 6 For part wind start accessory remove gray jumper wire between C A1 C1 and C A1A C1 Time delay relay sho...

Page 11: ...of components HOT GAS BYPASS Hot gas bypass usually is not rec ommended because it results in application of equipment out of its normal design application range However if its use is required the ap...

Page 12: ...ntinue or change at any time specifications or designs without notice and without incurring obligations PC 903 Catalog No 563 068 Printed in U S A Form 30GTN 10SI Pg 12 1201 1 00 Replaces New Book 2 T...

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