JOHNSON CONTROLS
4
FORM 160.76-PW5
ISSUE DATE: 09/06/2019
1. This wiring diagram describes the standard elec-
tronic control scheme for use with an electrome-
chanical starter. For details of standard modica-
tions, refer to Form 160.76-PW4.
2. Field wiring must be in accordance with the Na-
tional Electrical Code, as well as all other appli-
cable codes and specications. For eld wiring
connections, refer to product Form 160.76-PW1.
Field wiring contacts may have volt-
age present when power is removed.
Field wiring contacts could be con-
nected to external power sources.
3. The numbers along the left side of the diagrams
are line identication numbers. The numbers
along the right side indicate the line number loca-
tion of the relay contacts. An underlined contact
location signies a normally closed contact.
4. The main control panel class 1 eld wiring ter-
minal connection points are indicated by numbers
within a rectangle. The main control panel factory
wiring terminal connection points are indicated
by numbers within a triangle. Component mark-
ings are indicated by numbers within a circle.
Numbers adjacent to circuit lines are the circuit
identication numbers.
5. To cycle the unit on and off automatically with
contacts other than those shown, install a cycling
device between Terminals 1 and 13 (line 38). See
Note 9. If a cycling device is installed, the jumper
must be removed between Terminals 1 and 13.
6. Compressor motor starter with starter interlock
contacts (rated 0.5 A to 1.0 A at 24 VAC). The
control panel must be grounded.
7. Units installed in Canada must have a eld sup-
plied CSA approved 30 A disconnect switch and
a 20 A dual element fuse mounted external to the
control panel for 115 V control supply.
8. A remote run-stop switch may be connected to
Terminals 1 and 7 (line 32). See Note 9. Remote
run-stop (line 32) is operative only in the remote
operating mode.
9. The device contact rating is 5 mA at 115 VAC.
NOTES
10. The maximum allowable current draw for the sum
of all loads is 2 A holding, 10 A inrush.
11. The contact rating is 5 A resistive at 120 VAC or
240 VAC.
12. A jumper is installed between Terminals 21 and
24 for normal operation. To check motor rotation
on initial start-up, the jumper may be removed
as a momentary switch installed between Termi-
nals 21 and 24. Press the Start key on the display
screen on the control panel. After completion of
the prelube sequence, jog the motor with the mo-
mentary switch. When proper rotation is obtained,
replace the momentary switch with a jumper. The
momentary switch must have a minimum contact
rating of 1 FLA, 10 LRA at 115 VAC.
A temporary momentary switch
or jumper is the only connection
permitted between Terminals 21
and 24. Connections of any other
devices to either Terminals 21 and
24 may cause inadvertent compres-
sor start-up.
13. Motor overload (CM) is set to trip at 105% FLA.
During momentary power interruption (Power
Fault), contact opens for 1 second.
14. For high and low voltage units, the factory sup-
plied jumper between 15 and 53 must be removed
when electromechanical starter overloads or safe-
ty devices are used. For high voltage (2300-4160)
UL and CUL approved units only. Electromechan-
ical compressor motor starter overloads (normally
closed) must be connected between 15 and 53.
15. Contact rating is 5 A resistive at 250 VAC and
30 VDC, and 2 A inductive (0.4 PF) at 250 VAC
and 30 VDC.
16. Each 115 VAC eld-connected inductive load,
for example, Relay Coil, Motor Starter Coil, and
others, will have a transient suppressor wired in
parallel with its coil, physically located at the coil.
Spare transient suppressors and control circuit
fuses are supplied in a bag attached to the green
ground screw located in the lower left corner of
the control panel.
To Next Page
Loading...
