For 30GT130-210, 230A-315A, and 330A/B-420A/B units
with 380-3-60 and 380/415-3-50 power: Control voltage is
tapped from line to neutral. No additional power supply is
required. If a separate power source is required, follow these
instructions and disconnect the wires between the control and
power terminal blocks.
Units with a power supply of 380-3-60 have 230-1-60 con-
trol circuit power, which is taken from the unit’s power sup-
ply voltage. Units with a power supply of 380/415-3-50 have
230-1-50 control circuit power, which is also taken from the
unit’s power supply voltage. For control circuit current draw,
see Table 5.
For 30GT130-210, 230A-315A, and 330A/B-420A/B Units
with 230-3-50 or 346-3-50 power: A separate 230-1-50 con-
trol power source is required. Provide a 230-1-50 power source
for the control circuit through a field-supplied fused discon-
nect (per NEC or local code). This conductor must be cop-
per only. Control power enters the control box through a
7
⁄
8
-in. (22 mm) conduit connection located on the right side
of the control section.
All Units: Control circuit power draw includes the com-
pressor crankcase heaters at 180 w each, the 8 cooler heaters
(if equipped) at 210 w each, and the electronic board heater
at 120 w.
Crankcase heaters, cooler heaters, and board heater are
all wired into the control circuit ahead of the control
circuit switch. Therefore, they are always active even if
the control circuit switch is off.
An interlock circuit for external safeties, such as the chilled
fluid flow switch (CWFS), remote on-off, and chilled fluid
pump interlock (CWPI) is provided between terminals TB6-3
and TB6-4 for field use. To use this circuit, remove the fac-
tory jumper and install the switches.
LEGEND AND NOTES FOR WIRING DIAGRAMS (Fig. 16 and 17)
LEGEND
A
— Alarm
CWFS — Chilled Water (Fluid) Flow Switch
CWPI
— Chilled Water (Fluid) Pump Interlock
EQUIP — Equipment
NEC
— National Electrical Code
O.A.
— Outdoor Air
TB
— Terminal Block
Field Power Wiring
Field Control Wiring
Factory Installed Wiring
NOTES:
1. Factory wiring is in accordance with NEC (U.S.A.). Field modifi-
cations or additions must be in compliance with all applicable codes.
2. Wiring for main field power supply must be rated 75° C minimum.
Use copper, copper-clad aluminum, or aluminum conductors for
all units, except use copper conductors only for the following units:
30GT110, 290B, 315B 346-v; 30GT110, 290B, 315B 380/415-v
part-wind start; 30GT210, 315A, 390A, 420A/B 208/230-volts.
3. Power for control circuit should be supplied from a separate source
through a field-supplied fused disconnect. See Table 5 for re-
quired amp value for disconnect. Connect control circuit power to
terminals 1 and 2 of TB4. Connect neutral side of supply to
terminal 2 of TB4. Control circuit conductors for all units must be
copper only.
4. Terminals 3 and 4 of TB6 are for field connection for remote
ON-OFF control, CWPI, and CWFS. The contacts must be rated
for dry circuit application capable of reliably switching a 5 vdc,
0.5 mA load. Remove jumper between 3 and 4 of TB6 if remote
ON-OFF is installed.
5. The maximum load allowed for the remote alarm circuit is 75 va
sealed, 360 va inrush at 115- or 230-v, depending on model. Re-
move resistor across terminals TB5-1 and TB5-2 (080-110 and 230B-
315B units) when using remote alarm.
6. Dimensions in [
] are millimeters.
Fig. 16 — Field Control Power Wiring; Unit Sizes 080-110, 230B-315B
31
