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ALT417 0 0 AUTOMATIC Prevent Circuit Startup
ALT-417 Prestart Alert - Invalid
Compressor Envelope - Cir A
Compressor envelope selection
is invalid
Reload software
ALT419 0 0 AUTOMATIC Prevent Circuit Startup
ALT-419 Prestart Alert - Low
Line Voltage Cir A
VFD or STARTER line voltage is
below its high limit
(DRVA1STS_low_volt)
Check actual line voltage and
match against VFD nameplate
and jobsite requirements.
ALT421 0 0 AUTOMATIC Prevent Circuit Startup
ALT-421 Prestart Alert - Low Oil
Temperature Cir A
Oil sump temp is below 140°F
(77.8°C) AND Oil sump temp <
Evap Sat Temp + 15°F (8.3°C)
Check oil temperature. Check
that oil heater contactor/relay is
energized and that there is
voltage present on secondary of
contactor. Check if temperature
is still rising to determine if
additional time will solve the
issue. Check wiring. Check
resistance across the sensor.
ALT423 0 0 AUTOMATIC Prevent Circuit Startup
ALT-423 Prestart Alert - Low
Refrigerant Sensor Temp Cir A
Check evaporator liquid temp >
freeze temp limit
(SERVICE1_freezesp)
Verify voltage and ohm reading
across sensor. Replace sensor
if ohm reading is incorrect based
on temperature. Check Verify
freeze temp limit setting in
Configuration Service menu.
Verify that isolation valves are
open.
ALT425 0 0 AUTOMATIC Prevent Circuit Startup
ALT-425 Prestart Alert - Low
Saturated Refrigerant Temp Cir
A
Check evaporator saturated
temp > freeze temp limit
(SERVICE1_freezesp)
Check 5V supply from IOB to
evaporator pressure transducer.
Check pressure transducer
reference and ground. Replace
transducer if voltage checks out
good. Check freeze set point in
Service Configuration.
ALT429 0 0 AUTOMATIC Prevent Circuit Startup
ALT-429 Prestart Alert - Oil
Transducers Calibration Cir A
Oil Delta P is greater than 6 psi
before startup
Verify oil sump pressure and oil
discharge pressure sensors
individually. Verify wiring and
that each have 5V supply and
check pressure transducers
output and ground.
ALT431 0 0 AUTOMATIC Prevent Circuit Startup
ALT-431 Prestart Alert - Starts
Limit Exceeded Comp A
Tested only on prestart run
status, if number of compressor
starts is greater than Starts Per
Period Lim
(SERVICE1_stpperlim_A) within
Comp Start Period
(SERVICE1_cmpstper_A) time.;
NOTE: This alarm can be
bypassed when Starts Limit
Bypass (SERVICE1_stlim_by)
is set (1).
Verify that there is sufficient load
to run the unit. Default is 4 starts
per hour.
ALT433 5 4 AUTOMATIC Prevent Circuit Startup
ALT-433 Prestart Alert - VFD
Fault - Inverter Overtemp Cir A
Inverter temperature is below its
high limit (DRVA1STS_inv_ot)
Check drive inverter
temperature. Check Drive
Configuration. Check VFD
cooling fan operation. If
applicable check refrigerant
cooling line for flow.
ALT435 5 4 AUTOMATIC Prevent Circuit Startup
ALT-435 Prestart Alert - VFD
Fault - Rectifier Overtemp Cir A
Rectifier temperature is below its
high limit (DRVA1STS_rect_ot)
Check drive rectifier
temperature. Check Drive
Configuration. Check VFD
cooling fan operation. If
applicable check refrigerant
cooling line for flow. Check drive
PWM setting.
ALT501 0 0 AUTOMATIC Notify
ALT-501 Process Alert - High Oil
Pressure Differential Cir A
Oil Pump is ON
(OUTPUTS_OILR_A) AND OIL
PRESSURE DELTA
(PRESSURE_OIL_PD_A) > 45
PSI; Conditions persist (with
PRESSURE_OIL_PD_A > 40
PSI) for 55 sec.
Check oil pump. Check oil filter.
ALT505 10 0 AUTOMATIC Notify
ALT-505 Process Alert - High
Condenser Press Chiller Off
Cir A
Saturated condenser temp
(TEMP_CND_ST_A) >=
SATURATED CONDENSER
TEMP LIMIT (130°F/54°C) AND
ENTERING CONDENSER
WATER TEMP (TEMP_ECDW)
< 115°F/46°C AND chiller is
OFF (GENUNIT_STATUS = 0)
Check for high condenser water
temperatures. Check for low
water flow, tube fouling, division
plate/gasket bypass or plugged
condenser water strainers.
Check condenser pressure
sensor measurement.
Table 10 — PIC6 Alert Codes (cont)
CODE
HITS TO
ACTIVATE
HITS TO
RESET
RESET TYPE RESPONSE MESSAGE TRIP CONDITION TROUBLESHOOTING
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