Fig. 39 — Typical Low Voltage Control Wiring
LEGEND
ALMR
—
Alarm Relay (24 V) 5 VA Max
AWG
—
American Wire Gage
CFR
—
Condenser Fan Relay
CNFS
—
Condenser Flow Switch
CNP
—
Condenser Pump
CNPI
—
Condenser Pump Interlock
CWP
—
Chilled Water Pump
CWPI
—
Chilled Water Pump Interlock
DUAL
—
Dual Lead/Lag Temperature
LVT
—
Low Voltage Terminal Strip
NEC
—
National Electrical Code
OAT
—
Outside Air Temperature
SPT
—
Space Temperature
. . . . . .
—
Field Power Wiring
. . . . . .
—
Field Control Wiring
———
—
Factory-installed Wiring
NOTES:
1. Factory wiring is in accordance with UL 1995 standards. Field modifications
or additions must be in compliance with all applicable codes.
2. All units or modules have single point primary power connection. Main power
must be supplied from a field or factory supplied disconnect.
3. Wiring for main field supply must be rated 75°C. Use copper conductors only.
For unit sizes 016-045:
a. Incoming wire size range for terminal block with MCA (minimum circuit
amps) up to 120 amps is 14 AWG (American Wire Gage) to 2/0.
b. Incoming wire size range for terminal block with MCA from 120.1 amps to
310 amps is 6 AWG to 350 kcmil.
c. Incoming wire size range for non-fused disconnect with MCA up to 50
amps is 10 AWG to 2 AWG.
d. Incoming wire size range for non-fused disconnect with MCA from 50.1
amps to 90 amps is 6 AWG to 3/0.
e. Incoming wire size range for non-fused disconnect with MCA from 90.1
amps to 250 amps is 4 AWG to 350 kcmil.
f. Incoming wire size range for fused disconnect is 6 AWG to 10 AWG.
For unit sizes 050-071:
a. Incoming wire size range for terminal block 4 AWG to 500 kcmil.
b. Incoming wire size range for non-fused disconnect with MCA up to 170
amps is 6 AWG to 3/0.
c. Incoming wire size range for non-fused disconnect with MCA above 170.1
amps is 4 AWG to 350 kcmil.
4. Refer to certified dimensional drawings for exact locations of the main power
and control power entrance locations.
5. Terminal 24 of the LVT is for control of chilled water pump (CWP) starter. Ter-
minal 20 of the LVT is for control of condenser pump (CNP) starter or con-
denser fan relay (CFR). The maximum load allowed for the relays is 5 VA
sealed. 10 VA inrush at 24 VAC. Field power supply is not required.
6. Terminal 25 of LVT is for an alarm relay. The maximum load allowed for
alarm relay is 5 VA sealed, 10 VA inrush at 24 VAC. Field power supply is
not required.
7.
Make appropriate connections to LVT 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 24 VAC load up to 50 mA.
Installation of optional energy management board required.
8. Remove jumper between terminals 16 and 17 when field chilled water pump
interlock (CWPI) is installed.
9. All discrete inputs are 24 VAC.
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