27
Pre-Start-up
System position setup
System bit is a byte of memory. It can be set through a wire controller (to input "as password).
Each bit is defined as below:
Auto: (135)
0 Power-on manual start (default)
1 Power-on auto start (in the event of power failure)
Defrost: (136)
0 "Manual defrost" in vain (default)
1 "Manual defrost" in force
Flow: (133)
0 "Water switch mode" in vain (default)
1 "Water switch mode" in force (to give an alarm in 30S upon stop of water pump if switch is in
closure)
Ambient: (139)
0 Ambient thermo probe in vain (default)
1 Ambient thermo probe in force
Operating parameter setting
The protection and operation parameters of the water chiller can be set through the controller in a
shutdown state. Default parameters are set as below:
Bit8
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Temp
Flow
void
Ambient
Mode
Defrost
Pulse
Auto
Parameter setup
Maximum value Minimum value
Regulation
precision
Factory setting
Refrigerating return water temperature
25
℃
10
℃
1
℃
12
℃
Heating return water temperature
50
℃
25
℃
1
℃
40
℃
Winter antifreezing temperature
5
℃
1
℃
1
℃
3
℃
Defrost interval
90min
30min
1min
45min
Minimum running time of defrost
8min
1min
1min
1min
NOTICE:
a. It is recommended that refrigerating return water temperature be kept as factory setting;
otherwise low temperature setting may lead to low outlet water temperature and cause an
antifreezing alarm.
b. In case actual water flow is less than 70% of rated flow, refrigerating return water
temperature setting shall be at least , otherwise the addition of antifreezing agent into
water system is necessary (volume concentration of ethylene glycol in the water system is
not lower than 15%).
c. To prevent antifreezing alarm at low refrigerating return water temperature setting, please
increase the addition of antifreezing agent or use a large flow water pump in the water
system. Please consult Trane after-sales service personnel to modify the antifreezing setting.
