Trane CGAJ065, Руководство по обслуживанию

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52
Fault Handling
If the toggle switch is in
"
Modular control
"
position, this function is only valid for number 0 unit.
If the pump is overload during anti-freezing operation, it will be stopped immediately. The system will exit anti-freezing mode and the controller
will display pump overload alarm.
If the toggle switch is in
"
Heating pump
"
position:
Operation process: Under OFF or two-way valve interlock status, if the ambient temperature is
＜
5
℃
and the return water temperature is
＜ "
An-
ti-freezing starting temperature " -1 ℃ , the unit will activate heating automatically to prevent freezing → the controller displays " AP " , the pump starts
to run → the electronic expansion valve, four-way valve, fan and compressor start to run → discharge water temperature ＞" Anti-freezing stopping
temperature " , the devices will be shut down one by one and the system will return to shut down or interlock status.
If the ambient temperature is ＜ 5 ℃ and the return water temperature is ＜ " Anti-freezing starting temperature " , the pump will start to run. When
the return water temperature ＞" Anti-freezing starting temperature " +-1 ℃ and the heating is not started, the pump will stop.
During anti-freezing operation, press ON/OFF key to enter heating mode directly.
If the toggle switch is in
"
Cooling only
"
position:
If the ambient temperature is
＜
5
℃
and the return water temperature is
＜ "
Anti-freezing starting temperature
"
, the pump will start to run. When
the return water temperature
＞"
Anti-freezing starting temperature
"
+-1
℃
, the pump will stop.
8.Anti-freezing protection
If the conditions below are met in cooling mode, the compressor will be shut down and the electric heating for water loop will be activated. The
pump will continue running and the controller will display
" E3 " .
If the discharge temperature ≤ " Anti-freezing starting temperature (fan coil/plate type heat exchanger) " or the return water temperature – dis -
charge temperature ＞ 10 ℃ , the timing will be activated, and if the above conditions remains unchanged after 30s, the alarm will be triggered.
If the discharge temperature ≥ " Cooling anti-freezing stopping temperature (fan coil/plate type heat exchanger) " , the electric heating of water
loop will be stopped. When the fault occurs, the " Cooling plate type heat exchanger anti-freezing locking time " will be triggered, when the time is
over and the discharge temperature
≥"
Cooling anti-freezing stopping temperature (fan coil/plate type heat exchanger)
"
, the fault can be reset by
controller or centralized controller. After resetting the fault, the pump will continue to run a period of time before stopping.
9.Suction anti-freezing protection
If the conditions below are met in cooling mode, the compressor will be shut down and the electric heating for water loop will be activated. The
pump will continue running and the controller will display
" E4 " .
If the suction temperature of any system
≤ "
Suction anti-freezing starting temperature
"
, the timing will be activated;
When the discharge temperature
≥ "
Cooling anti-freezing stopping temperature (fan coil/plate type heat exchanger)
"
, the electric heating of wa -
ter loop will be stopped. When the fault occurs, the
"
Cooling plate type heat exchanger anti-freezing locking time
"
will be triggered, when the time
is over and the suction temperature ≥" Suction anti-freezing stopping temperature " , the fault can be reset by controller or centralized controller.
After resetting the fault, the pump will continue to run a period of time before stopping.
10.Cooling fin overheat protection
In cooling mode, if the fin temperature of any system
＞
68
℃
, the system will identify it as fin overheat. In this case, the system will shut down
and send alarm. Alarm code:
"
98
"
.
In cooling mode, the compressor of any system is only allowed to run when the fin temperature of the system ≤ 58 ℃ .
11.Ambient temperature off-limit protection
A. Normal temperature E type unit
The ambient temperature range for reasonable operation of the unit: cooling: 6
℃ ~50 ℃ ; heating: -15 ℃ ~26 ℃ .
If the temperature range is exceeded before startup, the unit cannot be started and a fault code will be reported; if the temperature range is ex -
ceeded during operation for 3 min, the unit will shut down automatically and a fault code will be reported. Fault code: " 87 " .
For cooling startup:
The second compressor in a parallel system can only be started when the ambient temperature
＞ 46 ℃ and the return water temperature ≤ 15 ℃ ;
If 2 compressors are running in a parallel system, one will be shut off mandatorily if the ambient temperature ＞ 46 ℃ and the return water tem -
perature ≥ 18 ℃ .
For heating startup: