26
FIELD CONTROL POWER CONNECTIONS (See
Fig. 18) — Units with a power supply of 230 (60 Hz),
208/230, 460, 575-3-60, require a separate 115-1-60 control
circuit power supply. Units with a 380/415-3-50 power supply
have factory pre-wired 230-1-50 control circuit power. A
separate power supply is NOT required for these units. All
other units require a separate 230 v control circuit power sup-
ply. Field control power connections are made at terminals 1
and 2 of TB4.
NOTE: Units with a 380/415 v main power supply do NOT
require a separate field-supplied control power supply. These
units have factory pre-wired control power.
Terminals TB5-1 and TB5-2 are provided for field installa-
tion of a chilled water (fluid) pump interlock (CWPI). Contacts
must be capable of handling a 24-vac load up to 50 mA.
An accessory remote on-off switch can be wired into
TB5-13 and TB5-14. See Fig. 18 for remote on-off and CWPI
wiring. Contacts must be capable of handling a 24-vac to
50 mA.
Terminals 11 and 12 of TB5 have been provided for a
field-supplied remote alarm (ALM). If an audible alarm is
installed, an alarm shutoff is also recommended. Power for a
field-supplied relay coil is factory-supplied but is limited to
75-va sealed, 360-va inrush. See Fig. 18.
Terminals 10 and 12 of TB5 have been provided for a
field-supplied chilled water (fluid) pump relay (CWP). Power
for the field-supplied relay coil is factory supplied, but is
limited to 75-va sealed and 360-va inrush. See Fig. 18.
CAUTION
Do not use interlocks or other safety device contacts
connected between TB5 terminals 13 and 14 as remote
on-off. Connection of safeties or other interlocks between
these 2 terminals will result in an electrical bypass if the
enable-off-remote contact switch is in the Enable position.
If remote on-off unit control is required, a field-supplied
relay must be installed in the unit control box and wired as
shown in Fig. 18. Failure to wire the remote on-off as
recommended will result in tube freeze damage.
30HXC CONDENSER
OUTLET
INLET
SENSOR
INLET
OUTLET
CHILLER CONTROL PANEL
30HXC CONDENSER
BYPASS VALVE
OPTIONAL BYPASS VALVE FOR NORMAL DUTY.
BYPASS VALVE REQUIRED FOR BRINE
APPLICATIONS TO PREVENT CONDENSER FREEZE-UP.
BYPASS VALVE
OPTIONAL BYPASS VALVE FOR NORMAL DUTY.
BYPASS VALVE REQUIRED FOR BRINE
APPLICATIONS TO PREVENT CONDENSER FREEZE-UP.
3 WAY VALVE
(OPTIONAL)
SIGNAL
4 to 20 mA WATER REGULATING VALVE
(SEPARATE FIELD-SUPPLIED POWER SUPPLY REQUIRED)
Fig. 21 — Condenser Temperature Regulating Valve Installation
TEMPERATURE CONTROLLED VALVE