FORM 150.60-NM3
31
YORK INTERNATIONAL
The anti-recycle timer message shows the amount of
time left on the respective anti-recycle timer. This mes-
sage is displayed when demand requires the respective
system to start but is being held off due to the timer.
The anti-coincident timer is a software feature that
guards against 2 compressors starting simultaneously.
This assures instantaneous starting current does not be-
come excessively high due to simultaneous starts. The
micro limits the time between compressor starts to 1
minute regardless of demand of the anti-recycle timer
being timed out. The time shown on the anti-coincident
timer is the time left on the timer before the respective
system will start. Demand must be present for the mes-
sage to be displayed and will only appear when the anti-
recycle timer has timed out.
The Suction Pressure Limiting message indicates a sys-
tem is being unloaded by the micro even though demand
requires loading. This safety assures that refrigerant re-
turning to the compressor provides proper motor cooling,
assuring that motor life is not compromised. This safety
will only activate when the chilled liquid temperature is
excessively high. Unloading will take place when suction
pressure exceeds the user programmable threshold of
80-105 PSIG. Reloading will take place when suction
pressure drops to 10 PSIG below the safety threshold.
Discharge Pressure Limiting takes affect when dis-
charge pressure nears the point at which the high pres-
sure cut-out will shut the system down causing total loss
of cooling. When this message appears, discharge pres-
sure has exceeded the user programmable threshold
and the micro is unloading the affected system to pre-
vent shutdown on a manual high pressure cut-out. Re-
loading will take place when discharge pressure has
dropped 60 PSIG below the threshold.
Optional discharge pressure transducers must be in-
stalled for this feature to operate. This is accomplished
by adding the Discharge Pressure Read-out option.
If the MANUAL OVERRIDE key is pressed, the STATUS
display will display the message shown above. This will
indicate that the Daily Schedule is being ignored and the
chiller will start-up when water temperature allows, UNIT
Switch permits, and SYSTEM Switches permit.
This is a priority message and cannot be overridden by
anti-recycle messages, fault messages, etc. when in the
STATUS Display mode. Therefore, do not expect to see
any other STATUS messages when in the MANUAL
OVERRIDE mode. MANUAL OVERRIDE is to only be
used in emergencies or for servicing.
FAULT STATUS MESSAGES
Thirteen possible fault messages may appear when the
STATUS key is pressed. Whenever a fault message ap-
pears, the safety thresholds on the chiller have been ex-
ceeded and the entire chiller or a single system will be
shut down and locked out. A detailed explanation of the
shutdown thresholds and associated information related
to each fault is covered in the SYSTEM SAFETIES sec-
tion (Page 51).
Chiller shutdown faults will shut the entire chiller down and
lock it out, while system shutdown faults will only shut
down and lock out the affected system (compressor).
A list of the fault messages is shown on the next page:
S Y S # 1
A R
T M R
X X X
S
S Y S # 2
A R
T M R
X X X
S
S Y S # 1
S U C T
L I M I T I N G
S Y S # 2
S U C T
L I M I T I N G
S Y S # 1
D S C H
L I M I T I N G
S Y S # 2
D S C H
L I M I T I N G
M A N U A L
O V E R R I D E
S Y S # 1
A C
T M R
X X
S
S Y S # 2
A C
T M R
X X
S
Summary of Contents for YCAJ44HE8
Page 16: ...16 YORK INTERNATIONAL WIRING DIAGRAMS LD02165 FIG 5 ELEMENTARY DIAGRAM...
Page 17: ...FORM 150 60 NM3 17 YORK INTERNATIONAL FIG 5 ELEMENTARY DIAGRAM Cont d LD02166...
Page 20: ...20 YORK INTERNATIONAL CONNECTION DIAGRAM ELECTRICAL BOX FIG 7 CONNECTION DIAGRAM LD02171...
Page 21: ...FORM 150 60 NM3 21 YORK INTERNATIONAL FIG 7 CONNECTION DIAGRAM Cont d LD02172...
