7
Limitations and Warnings
•
Voltage range
The power supply of the unit must comply with the operation power specified on the nameplate of the unit. The power supply must meet
the demand of the unit, with allowable fluctuation range of main voltage: ±10%, and maximum phase unbalance: ±2%.
•
Water flow
The flow goes through the unit must meet the basic demand for heat exchange, with as less deviation as possible. If the cold water flow
going into the evaporator is too low, it will cause discontinued flow and affect the heat transfer effect which can lead to out of control of
expansion valve or abnormal low voltage jumping. On the contrary, if the water flow is too big, the internal parts of the evaporator will be
corroded. As for condenser, if the water flow is too low, it will activate high pressure protection or cause excessive air exhaust tempera
-
ture will can affect the normal operation and reduce the service life of the unit.
Flow fluctuation range: lower limit=0.60*rated flow; upper limit=1.30*rated flow.
•
Water pressure drop
Make sure the lift of the pump meets the requirement before running the unit. If the actual water pressure drop is too big, please add
additional pumps.
•
DIP switch setup
SW1: Function definitions
The default mode is single unit control, if modular control is needed, the bit8 of SW2 should be set to ON; the Bit1-5 of SW1 is set to OFF by
default, if modular control is needed, user should set the code on-site as needed.
The Bit1-5 of the switch is used for code address of centralized control. (Note: The modular host of must set to 00)
SW1: Centralized control address setup
Unit Number (Centralized controller shows A0)
SW1 Switch
1
2
3
4
5
0 (Centralized controller shows A0)
OFF
OFF
OFF
OFF
OFF
1 (Centralized controller shows A1)
ON
OFF
OFF
OFF
OFF
2 (Centralized controller shows A2)
OFF
ON
OFF
OFF
OFF
3 (Centralized controller shows A3)
ON
ON
OFF
OFF
OFF
4 (Centralized controller shows A4)
OFF
OFF
ON
OFF
OFF
5 (Centralized controller shows A5)
ON
OFF
ON
OFF
OFF
6 (Centralized controller shows A6)
OFF
ON
ON
OFF
OFF
7 (Centralized controller shows A7)
ON
ON
ON
OFF
OFF
8 (Centralized controller shows A8)
OFF
OFF
OFF
ON
OFF
9 (Centralized controller shows A9)
ON
OFF
OFF
ON
OFF
10 (Centralized controller shows AA)
OFF
ON
OFF
ON
OFF
11 (Centralized controller shows AB)
ON
ON
OFF
ON
OFF
12 (Centralized controller shows AC)
OFF
OFF
ON
ON
OFF
13 (Centralized controller shows AD)
ON
OFF
ON
ON
OFF
14 (Centralized controller shows AE)
OFF
ON
ON
ON
OFF
15 (Centralized controller shows AF)
ON
ON
ON
ON
OFF
16 (Centralized controller shows B0)
OFF
OFF
OFF
OFF
ON
17 (Centralized controller shows B1)
ON
OFF
OFF
OFF
ON
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit8
Code address
Type
Two-way valve
interlock
Control
WARNINGS
It is prohibited to conduct parameter change without the guidance from professionals. Wrong parameter changes
can cause freezing damage to the unit or lead to abnormalities such as frequent protection.
