24
Fig. 18 — Field Wiring, 30HXA,C076-271
SEE
NOTE 12
SEE
NOTE 12
1. Factory wiring is in accordance with National Electrical Code (NEC). Field modifications or additions must be in compliance with all
applicable codes.
2. Wiring for main field supply must be rated 75 C minimum. Use copper for all units. Maximum incoming wire size for each terminal
block is 500 kcmil.
3. Power for control circuit should be supplied from a separate source (except 380/415v units) through a field-supplied disconnect
with 15A maximum protection for 115v control circuits and 15A maximum protection for 230v control circuit. Connect control circuit
power to terminals 1 and 2 of TB4. Control circuit conductors for all units must be copper only. Control circuit power is factory wired
for 380/415v units.
4. Terminals 13 and 14 TB5 are for field external connection for remote on-off. The contacts must be rated for dry circuit application
capable of handling a 24vac load up to 50mA.
5. Terminals 1 and 2 of TB5 are for chilled water pump interlock (CWPI) functions. If added, chilled water pump interlock contacts
must be wired in series with flow contacts. The contacts must be rated for dry circuit application capable of handling a 24vac load
up to 50mA. Chilled water flow switch (CWFS) is factory installed.
6. Terminals 10 and 12 of TB5 are for control of the chilled water pump starter. The maximum load allowed for the chilled water pump
relay is 75va sealed, 360va inrush at 115v or 230v. Separate field power supply is not required.
7. Terminals 11 and 12 of TB5 are for alarm relay. The maximum load allowed for the alarm relay is 75va sealed, 360va inrush at
115v or 230v. Separate field power supply is not required.
8. Terminals 7 and 9 of TB2 are for condenser water pump (HXC) or circuit A condenser fan contactor (HXA only). Terminals 8 and 9
of TB2 are for circuit B contactor (HXA only) or liquid line solenoid valves (factory-wired 30HXC brine). The maximum load allowed
is 75va sealed, 360va inrush at 115v or 230v. Separate field power supply is not required. Liquid line solenoid valves (30HXA only)
must be connected in parallel fan contactors as shown.
9. Terminals 5 and 6 of TB2 are for condenser flow switch (CNFS) and/or condenser pump interlock (CNPI). The contacts must be
rated for dry circuit application capable of handling a 24vac load up to 50mA.
10. Make appropriate connections to TB6 as shown for energy management board options. The contacts for demand limit and ice
done options must be rated for dry circuit application capable of handling a 24vac load up to 50mA.
11. TB1B supplied on 30HXA186 208/230v Y-Delta, 30HXA206-271 208/230, 230v Y-Delta and by special order.
12. 500 kcmil if minimum circuit amps (MCA) 200A, 300 kcmil if MCA 200A.>
LEGEND
A—Alarm CWPI — Chilled Water Pump Interlock OAT — Outdoor Air Temperature
CFR — Condenser Fan Relay EMM — Energy Management Module SPT — Space Temperature
CNFS — Condenser Flow Switch EWT — Entering Water Temperature TB — Terminal Block
CNPI — Condenser Pump Interlock FIOP — Factory-Installed Option Factory Installed Wiring
CNPR — Condenser Water Pump LLSV — Liquid Line Solenoid Valve Field Control Wiring
CWFS — Chilled Water Flow Switch LWT — Leaving Water Temperature Field Power Wiring
CWP — Chilled Water Pump NEC — National Electrical Code
a30-4650
To Next Page
Loading...
