Operating instructions

13
SYMPTOM: Poor cooling capacity
POSSIBLE CAUSE REMEDY
Poor vacuum
Evacuate noncondensible gases from the vacuum section through
service valves A and B.
Low heat medium inlet Check the heat medium inlet temperature. Increase the temperature
temperature if it is below the original design conditions (max. 203
o
F).
High cooling water inlet
Check for Error Code E37 on the control panel. If this error code is
temperature
displayed, push the Alarm Reset on the control panel after the cause
is eliminated.
Low cooling water flow Check for flow restrictions in the strainer and piping.
Measure the temperature difference between the condenser surface
Fouling in the condenser and and the cooling water outlet (LTD). If LTD is greater than 7
o
F, with
absorber a good vacuum and correct cooling water flow, the condenser and
absorber tubes are fouled and should be chemically cleaned.
NOTE: If the chiller or chiller-heater does not operate as expected after checking the above remedies,
contact your Authorized Yazaki Service Provider for further assistance.
ERROR CODES
ERROR
CODE
DESCRIPTION REMARKS
E01
Remote monitoring system power supply
NA
interrupted
E02
Remote monitoring system communication
NA
wire short circuit or reverse connection
E03
Remote monitoring system communication
NA
line noise
E04
ST2 Interlock open circuit (optional field
wiring connection)
E05
P1 (chilled/hot water pump) overload
relay tripped
E06
P2 (cooling water pump) overload
Immediate shutdown. Manual reset required
relay tripped
after repair.
E07
CT (cooling tower fan) overload
relay tripped
E08 SP (solution pump) overload relay tripped
E09-E12 NA
WTO (chilled/hot water temperature sensor)
Immediate shutdown when open circuit
E13
wire open or short circuit
(<14.4
o
F) or short circuit (>193.6
o
F) detected.
Automatic reset after repair.
E14-E26 NA
FS1 (chilled/hot water flow switch)
Alarm when low flow is detected for 10 min.
E27
low flow
anytime 1 min. after P1 starts. Heat input stops
immediately and restarts automatically
after flow restored. Continuous pump
operation.
FS2 (cooling water flow switch) low flow
Shutdown when low flow is detected for 2 sec.
E28
(optional field wiring connection)
anytime 1 min. after P2 starts. Automatic reset
after flow restored.