7
AE-1318 R1
© 2008 Emerson Climate Technologies
Printed in the U.S.A.
Application Engineering
B
U
L
L
E
T
I
N
of 9 VDC for checking – do not attempt to check
continuity through the sensors with any other
type of instrument. Any external voltage or
current may cause damage requiring compressor
replacement.
During normal operation, this resistance value
a.
should read less than 4500 ohms ±20%.
If the M1-M2 contacts are open, the measured
b.
S1-S2 value is above 2750 ohms ±20% and
the compressor has been tripped less then
30 minutes then the module is functioning
properly.
If the S1-S2 wire leads read less than 2750 ohms
•
±20% and the M1-M2 contacts are open, reset
the module by removing the power to T1-T2 for a
minimum of 5 seconds.
Replace all wire leads and use a voltmeter to verify
•
the M1-M2 contacts are closed.
If the M1-M2 contacts remain open and S1-S2 are
•
less than 2500 ohms, remove leads from the M1-
M2 contacts and jumper together;
CAUTION: Compressor should start at this time.
HOWEVER DO NOT LEAVE JUMPER IN PLACE FOR
NORMAL SYSTEM OPERATIONS. THE JUMPER IS
USED FOR DIAGNOSTIC PURPOSES ONLY.
Go to Compressor Supply Voltage
•
Troubleshooting.
Compressor Voltage Supply Troubleshooting
Remove phase sensing leads from the module
•
from L1/L2/L3.
Use a voltmeter to measure the incoming 3 phase
•
voltage on L1/L2/L3. WARNING: L1/L2/L3 could
be at a potential up to 600VAC.
Ensure proper voltage on each phase.
•
Remove power to the module for a minimum of 5
•
seconds to reset and replace all wire leads. Re-
energize the module. If the M1-M2 contacts are
open with proper voltage to T1-T2, L1/L2/L3 and
proper resistance to S1-S2 then the module is
faulty and should be replaced.
Oil Type
Polyol ester lubricant (POE) must be provided if the
refrigeration scroll is used with HFC refrigerants.
Copeland Scroll refrigeration compressors intended
for use with R22 are supplied with mineral oil.
Reference
Table 7
for proper oil charge. See
Form
93-11
for a complete list of all Emerson approved
lubricants.
Oil Management for Single Compressor
Applications
If the oil level is above the sight glass, oil circulation
rates greater than 1.5% may be experienced with
the ZB50, ZB58, ZB66, ZB76, ZB88, ZB95 & ZB114
compressors. This is especially true in the larger
compressors in 60 Hz applications.
Oil Management for Rack Applications
Copeland Scroll refrigeration compressors may be
used on multiple compressor parallel rack applications.
This requires the use of an oil management system to
maintain proper oil level in each compressor crankcase.
The sight glass connection supplied can accommodate
the mounting of the oil control devices.
Unlike Semi-Hermetic compressors, the scrolls do
not have an oil pump with accompanying oil pressure
safety controls. Therefore, an external oil level control
is required.
The OMB Oil Level Management Control combines the
functions of level control and timed compressor shut-
off should the level not come back to normal within
a set period of time. This device has been found to
provide excellent performance in fi eld tests on Scroll
compressors and is recommended for parallel system
applications.
Note: Emerson Climate Technologies' Application
Engineering Department should be contacted for
approved oil management systems.
TABLE 7
COMPRESSOR OIL CHARGE
Model
Initial
Recharge
ZB50
ZB58
ZB66
ZB76
ZB88
ZB95
ZB114
ZB56
ZB68
ZB75
ZB92
ZB11M
85
85
110
110
110
110
110
140
140
140
140
140
81
81
106
106
106
106
106
137
137
137
137
137
