6
Compressor Unit Connections
— Extend power leads from
control center (contactor terminals) to compressor terminal box
and make connections as shown in Fig. 4.
Terminals 8 and 9 on motor terminal plate are for internal
protector connections. As shown in Fig. 4, run a wire from ter-
minal 9 to terminal 6 on TB2 in control center and a wire from
terminal 1 on OL2 to terminal 2 on HPS in control center.
Run crankcase heater power wiring into control center.
Connect leads to terminal 5 on pumpout relay and terminal 3
on terminal block TB2. See Fig. 5.
Affix power warning label supplied in the installer’s packet
to fused disconnect which energizes crankcase heater (see unit
label diagram).
CONTROL WIRING — Control circuit power is 115 volts,
energized from an external source or from unit voltage through
field-supplied transformer. Transformer size required is 350 va
for 60 Hz units. External control power source must be
supplied through a 15-amp fused disconnect. Connect control
circuit power leads to terminal block TB2, terminals L1 and
L2. Terminal L2 is neutral potential (ground).
Compressor Protection
— The 06D and 07D units are factory
wired for single-pumpout control. Field addition and wiring of
line voltage remote control and liquid line solenoid valve is
required. (See unit Fig. 3 and Fig. 6.) Remote control minimum
contact rating must be 25 va. Solenoid valve must have a
maximum load rating of 50 va holding; 200 va inrush. For
applications with cooling tower, air-cooled or evaporative
condensers, add necessary auxiliary contacts in line between
compressor contactor and terminal A1 on timer. Insert desired
interlocks and overloads between terminals 5 and 9 on terminal
block TB2.
Control wiring may be modified as shown in Fig. 6 for
automatic pumpdown control; remove low-pressure switch
between timer relay and terminal 4 on TB2. Wire low-pressure
switch between terminals 9 and 6 on TB2. Add necessary
auxiliary contacts between compressor contactor and terminal
A1 on timer. Remove wire between terminal 6 on TB2 and
terminal 3 on pumpout relay. Insert required interlocks and
overloads between terminals 5 and 9 on TB2.
Limitations —
Do not use automatic pumpdown control
on direct expansion cooler applications or when compressors
are equipped with pressure-type unloader valves. Pressure
unloader valves have built-in high to low passage which allows
compressor to cycle with automatic pumpdown.
LEGEND
Fig. 4 — Compressor Terminal Diagram
HPS —
High-Pressure Switch
OL —
Overload Relay
TB —
Terminal Block
Factory Wiring
Fig. 5 — 06D/07D Control Box Components and Connections (3-Phase)
LEGEND
NOTES:
1. Factory wiring is in compliance with NEC. Any field modifications or
additions must be in compliance with all applicable codes. Use copper,
copper-clad aluminum for field power supply only.
2. Field power supply wiring must be 75 C minimum.
3. Compressor thermally protected. Three-phase motors are protected
against primary single-phasing condition.
4. Pilot duty control must be field supplied. Minimum contact rating must
be 25 va.
5. 60 Hz units have 120-volt control circuit. 50 Hz units have 230-volt con-
trol circuit. A separate source of supply at the correct voltage must be
field supplied thru a fused disconnect device with a max rating of 15 A
to TB2 connections (Hot Side) and (Neutral).
6. Open control circuit disconnect switch for servicing only. Disconnect
must remain closed for crankcase heater to operate.
7. A transformer of the following rating may be field supplied for 60 Hz
units: 350 va.
8. Transformer must be fused and grounded per applicable codes.
9. If any of the original wiring furnished must be replaced, it must be
replaced with 90 C wire or its equivalent.
C—
Contactor, Compressor
NEC —
National Electrical Code
CH —
Crankcase Heater
OL —
Overload Relay
CR —
Control Relay
OPS —
Oil Pressure Switch
FU —
Fuse
POR —
Pumpout Relay
GND —
Ground Connection
SW —
Switch
HPS —
High-Pressure Switch
TB —
Terminal Block
IP —
Internal Protector
TM —
Timer Motor
LPS —
Low-Pressure Switch
TR —
Timer Relay
L1
L2
