Installation manual

Installation
13
Figure 8 Electrical connection details
Remote Heat Rejection Connections
Diagram is for direct
drive air-cooled
condensers
(for air-cooled units)
and direct drive
drycoolers
(for glycol/GLYCOOL
units).
Control
Board
Wire Legend
2-wire connection for
heat rejection interlock
(Note 5)
2-wire connection for
common alarm
4-pin plug connections for
optional remote
temperature and humidity
sensor
Factory-supplied line
voltage wiring
Field-supplied line
voltage wiring
Factory-supplied 24V,
NEC Class 2 wiring
Field-supplied 24V
NEC Class 2 wiring
Field-supplied earth
grounding wire
2-wire connection
optional SiteScan
2-wire connection for
each Special Alarm
(Note 4)
2-wire connection for
remote unit shutdown
(Note 3)
Earth ground to ground
lug bolt or optional
ground bar
3-phase line voltage
supply to line voltage
connection block or
optional main disconnect
switch (Note 2)
To line voltage
components on Liebert
room unit electric panel
To line voltage
components in
Liebert room
unit
OR
37 38 24 50 51 55 56 77 78
L1
L2
L3
P16
22 ga. 4-wire cable
75 76 70 71
6-inch
pigtails at
junction
box
Terminals 75 & 76 are
connected to common alarm
relay (K3) NO contact (max 1A
at 24V)
Wires 70 & 71 are connected
to compressor side switches
and Econ-O-Coil relay (R5).
R5 is provided on FE/UE
units only.
NOTES
1. Refer to specification sheet for
Full Load Amps and Wire Sizing
Amps.
2. Field-supplied room unit main
disconnect switch in accordance
with local codes ordered as
optional equipment and factory-
installed in Liebert room unit.
3. For remote unit shutdown,
replace jumper between 37 & 38 at
terminal strip with Normally
Closed switch having a minimum
75VA rating.
4. Special alarm connection made by
adding Normally Open contacts
between Terminals 24 & 50, 24 &
51, 24 & 55 and 24 & 56. Only one
alarm (between 24 & 50) is
available on standard
microprocessor.
5. Heat rejection interlock is not
supplied on chilled water models.
6. Field-supplied disconnect switch
mounted within sight of
condenser/drycooler and in
accordance with local codes or
ordered as optional equipment
and factory-installed in Liebert
condenser/drycooler. CDF-065,
CDF-083, CDF-086, CDF-097 and
CDF-104L are single-phase fan
speed condensers. All other
condensers and all drycooler and
pump packages require a 3-phase
line voltage supply.
7. Glycol pump package supplied
with drycoolers only. Pump 2 is
supplied only when dual pump
package is ordered.
8. Lee-Temp tanks and assembly
supplied on air-cooled
condensers with Lee-Temp
control systems only.
ROOM UNIT CONNECTIONS
3-wire line voltage
connection plus ground for
glycol pump. An additional
3-wire line voltage needed
for dual pump packages
(Note 7).
2-wire connection for heat
rejection interlock
Earth Ground
3- or single-phase line voltage
supply to optional main
disconnect switch (Note 6)
2-wire connection plus
ground for Lee-Temp heater
pads (Note 8)
1 fan
2 fan
See Note 8
3 fan
Interconnected
Electric Panel
2
1
DISCONTINUED
PRODUC T