Carrier 19DA User Manual
Page 7
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Table 3 - Motor Overload Module
Calibrating Electronic Controls
- Honeywell (Fig. 4) or Barber-Colman (Fig. 5)
SEQUENCE
H
B-C
PROCEDURE
1. Check Voltage Signal
from current trans
former - (leads
disconnected)
X
X
A. Shut down compressor:
X
1. Rotate CRl (6) and CR2 (7) calibration screws fully clockwise.
X
X
2. Disconnect leads to terminals 23 and 24 on terminal strip.
Attach voltmeter to these leads.
X
X
3. Place clamp on ammeter on one of three incoming starter wires.
X
X
B. Start compressor:
X
X
1. Press START button.
X
2. Open vanes manually by depressing INCREASE button (5).
X
3. Place the capacity control switch (15) on HIGHER position to
open vanes manually.
NOTE; At- iOO percent Ml load current^ voltmeter must
read at least 0.55 volts. If not in this range, check sizing
of resistor in starter.
2. Recheck voltage
signal (leads
connected)
X
X
A. Shut down compressor:
X
X
1. Remove voltmeter from leads.
X
X
2. Replace leads to terminals 23 and 24.
X
X
3. Attach voltmeter to terminals 23 and 24.
X
X
B. Start the compressor:
X
X
1. Open vanes manually. Voltmeter must read between 0.45-0.55
volts at 100 percent full load current.
X
X
2. Press STOP button and remove voltmeter.
3. Calibrate motor
current settings
(compressor
operating)
X
A. Barber-Colman:
1. Open vanes manually until motor current reaches 108 percent
of nameplate current.
X
2. Adjust CRl calibration screw (6) until vanes begin to close.
Observe movement of vane motor linkage.
X
3. Set capacity control switch (15) on HIGH. When motor reaches
103 percent of full load amperage, adjust CR2 calibration
screw (7) until vanes stop moving.
X
B. Honeywell:
1. When motor current reaches 103 percent of rated amperage,
adjust calibration screw (18) until relay CR2 (23) is open and
relay CRl (22) is closed.
X
2. Hold relay CR2 (23) closed, and open vanes with INCREASE
button (5). When motor current reaches 108 percent of rated
amperage, relay CRl (22) should open.
X
X
C. Honeywell and Barber-Colman:
1. Close vanes and open again to recheck 103 percent and 108
percent settings.
m
H = Honeywell
B-C = Barber-Colman