JOHNSON CONTROLS
161
SECTION 8 – SERVICE
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
8
ALARM TROUBLESHOOTING
Refrigerant System Alarm Codes
(01, 02, 03, 04, 09, 10, 11, 12)
The first 12 alarms involve controls intended to protect
the compressors. Each compressor system is equipped
with external circuitry monitoring hardware intended
to protect the compressor in case the operating charac-
teristics of the refrigerant system fall outside the safe
operating envelope for the compressor. The type of
protection varies depending on the type of compressor
used.
YPAL 050 Compressors 1A, 1B, 2A, and 2B
YPAL 051 Compressors 1A, 1B, 2A, and 2B
YPAL 060 Compressors 1A and 2A
YPAL 061 Compressor 1A
The Compressor Safety Circuit consists of a high-
pressure cutout switch. Each of the compressors is also
protected by internal line break switch imbedded in the
windings of the compressor that protects the compres-
sor from excessive current or temperatures. The Unit
Controller will not be able to identify the internal line
break switch is open and no fault will be generated or
reported by the Unit Controller.
If the internal line break is open it will appear as a com-
pressor failure. To troubleshoot verify the compres-
sor contactor for the compressor that is not running,
is closed and line voltage is present on the load and
line side of all three legs. If so remove power from the
unit and remove the cover from the compressor con-
trol box. Check for an open winding. If all three wind-
ing are open carefully check the compressor shell. If
the shell is hot no determination can be made until the
shell has cooled. If the shell is cool and a winding is
open the compressor is defective. If the windings close
as the compressor cools the internal line break switch
was open. Some possible causes for an open switch
are, high discharge super heat (low charge), start of a
bearing failure (partial locked rotor), or high voltage.
The above units also have a low- pressure cutout that
will be discussed later.
Since tandem compressors are used there is a single
high pressure switch for system 1 and one for system
2. If the high pressure switch opens both of the com-
pressors for that system will be turned off. If the high
pressure switch for system 1, (compressors 1A, 1B),
opens it will generate both a 01 and 02 alarm code.
Likewise if the high pressure switch opens for system
2, (compressors 2A, 2B), opens it will generate both a
03 and 04 alarm code.
The high pressure switch opens at 625 PSIG and clos-
es at 500 PSIG. In order to generate a high pressure
lockout the high pressure switch must open three times
within a 2 hour window.
24VAC power is supplied to the system 1 high pressure
switch circuit from wire 399 at terminal HPS1 of the
P15 connector. The binary input back to the Unit Con-
troller from the high pressure switch is wire 400 at ter-
minal HPS1 of the P15 connector. The above input is
then jumpered to terminal HSP2 of the P15 connector.
24VAC power is supplied to the system 2 high pressure
switch circuit from wire 431 at terminal HPS3 of the
P16 connector. The binary input back to the Unit Con-
troller from the high pressure switch is wire 432 at ter-
minal HPS3 of the P16 connector. The above input is
then jumpered to terminal HPS4 of the P16 connector.
Because there is no external compressor protection
module on these models jumpers are placed between
terminals C10 and C10 of the P12 connector for com-
pressor 1A, C20 and C20 of the P12 connector for
compressor 1B, C30 and C30 of the P12 connector for
compressor 2A, and C40 and C40 of the P12 connector
for compressor 2B.
YPAL 060 Compressors 1B and 2B
YPAL 061 Compressors 1B, 2A and 2B
The high pressure switches are connected as described
above; however, the compressors identified above em-
ploy a compressor protection module. 24VAC power is
supplied to the compressor protection module for com-
pressor 1B from wire 441 at terminal C20 of the P12
connector. The binary input back to the Unit Controller
from the compressor protection module is wire 440 at
terminal C20 of the P12 connector.
24VAC power is supplied to the compressor protection
module for compressor 2A from wire 443 at terminal
C30 of the P12 connector. The binary input back to the
Unit Controller from the compressor protection mod-
ule is wire 442 at terminal C30 of the P12 connector.
24VAC power is supplied to the compressor protection
module for compressor 2B from wire 445 at terminal
C40 of the P12 connector. The binary input back to the
Unit Controller from the compressor protection mod-
ule is wire 444 at terminal C40 of the P12 connector.
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