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Information Manual 73
Low Chilled Water Temp: Unit
Off
(Unit in Auto but not Starting or
Running)
IFW-AR Chiller Unit in
Auto and
No Ckt's
Energize
d (Any
Ckt(s)
Energize
d)
a. The chilled water temp. fell below the cutout
setpoint while the compressor (or Solution
Pump) was not running for 30 degree F
Seconds. Automatic Reset of the IFW dig shall
occur 2 degrees F (1.1 °C) above the cutout
setpoint.
Check Flow,
Sensor, & Wiring
Low Chilled Water Temp: Unit
On
(Unit Starting or Running)
MAR Chiller Any
Ckt(s)
Energize
d
(No Ckt's
Energize
d)
a. The chilled water temp. fell below the cutout
setpoint while the compressor (or Solution
Pump) was running for 30 degree F Seconds.
Automatic Reset of the MAR diag shall occur 2
degrees F (1.1 °C) above the cutout setpoint.
Check Flow,
Sensor, & Wiring
Low Differential Oil Pressure MMR Circuit All
starting
and
running
Modes
Pre-Lube Mode on CVHE/F Chillers:
a. See Diagnostic 1FF.
Start & Run Mode on CVHE/F Chillers:
a. If during these modes the Differential oil
pressure drops below 9 PSID for more than 90
Psid Seconds, an MMR diagnostic shall be
generated. The 90 Psid Seconds integral shall
be reset to zero when the differential pressure
rises above 9 psid.
Pre-Lube Mode on CVGD/CVAD Chillers:
a. See Diagnostic 1FF.
Start & Run Mode on CVGD/CVAD Chillers:
a. While Starting and Running, if the differential
oil pressure switch opens for more than 3-5
seconds, generate an MMR diagnostic.
Check Oil
System
Low Evap Rfgt Temp. MMR Stepper Starter
Contactor
Energize
d or in
Free
Cooling
a. The Saturated Evap Rfgt Temp dropped
below
the Low Rfgt Temp. Cutout Setpoint when the
circuit was running for 30 °F seconds.
Check
Operation, Call
Service
Low Evap.Water Flow
(To be implemented in CTV
Phase C release and ABS
Phase B release.)
IFW-AR Chiller Chiller
Auto and
All
Running
Modes
a. The evap. water flow measurement option
was installed and the flow dropped to a setpoint
set at the CLD. This IFW shall be Auto Reset
and reset 0.1 gpm/ton above the adjustable trip
point or when the Evaporator pump is turned off.
b. There shall be a 2 minute delay in permitting
this diagnostic to be called out from the time the
evap pump has been turned on AND flow has
been established/confirmed via the flow switch
input.
c. This is not necessarily active in a Manual On
of the Evaporator pump. That is, if the chiller is in
the Stop mode and the Evap. Relay is manually
turned on, this diagnostic shall not be active.
(Manual On is not taken into account.)
See
Troubleshooting
Service Bulletin
Low Oil Temp MAR Circuit All Non-
running
Modes.
The oil temperature dropped below it's
adjustable Low Oil Temp. Cutout.
(“Instantaneous trip” but consistent with the
analog input filtering function.) See Section
P4_CPRSR for further description of this
diagnostic. Automatic Reset of the MAR diag
shall occur 5 degrees F (2.8 °C) above the
cutout setpoint.
See
Troubleshooting
Service Bulletin
DIAGNOSTIC DESCRIPTION
Diag
Type
Module
that
Called
Diag.
Diag.
Active
Modes
CAUSE Help Message
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