Z series combination household (townhouse)central air conditioning unit
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2) Auto anti-freezing operation is set in control system for assisting system. Its principle is: When unit
is in standby state (don’t cut off power), and ambient temperature and system water temperature is at about
0 degree, control system will start water pump and compressor till water temperature reaches safety point.
Thickness of glycol liquid—freezing point list:
Thickness %
Freezing point
℃
Thickness %
Freezing point
℃
Thickness %
Freezing point
℃
4.6
-2
19.8
-10
35
-21
8.4
-4
23.6
-13
38.8
-26
12.2
-5
27.4
-15
42.6
-29
16
-7
31.2
-17
46.4
-33
In the list: Thickness of glycol is mass thickness.
9. System Adjustment
9.1 Charge of Refrigerated Water to Air Conditioning System
Fill water to the refrigerate water pipe of system from water pipe, meanwhile, conduct auto gas exhaust
from exhaust valve till the integral pipe filled with water, and confirm air in pipe had completely be exhausted.
9.2 Check before Trial Run
9.2.1 Check indoor fan coil
1) Check if power cord connection of all indoor fan coils is correct, and rotation direction of fan motor is
correct.
2) Check if the valve on entrance and exit pipes of fan coil is completely open.
3) Exhaust it from exhaust valve when there is gas inside fan coil.
9.2.2 Check unit
1) Check if the outer appearance of unit and pipeline system is damaged when transporting or conveying.
2) Check if wiring terminals for electric components inside unit is loose, if phase sequence is correct.
3) Check if vane of fan motor would intervene the outer case and net cover when rotating.
4) Check if temperature sensor had inserted well, if it is loose.
9.2.3 Check pipeline system
1) Check if valves at pipeline system is open completely.
2) Check if water has filled the integral pipeline system, if air is exhausted completely.
3) Check if heat preservation to pipeline system is well.
9.3 Trial Run
Trial run can only be conducted after passing all above checking, then do it under the guideline of
professional personnel.
1) Energize and turn on the unit. To the unit that adopts 3-phase power, when wire sequence of power is
in reverse, phase sequence protection works, then fan motor, compressor and water pump will not act. At that
time, cut off power first, exchange the two phases among the 3-phase then electrify again and turn on the unit.
2) After energization and operation, circle water pump should operates steadily. If it operates unsteadily,
and swing of pressure meter is unstable, there also is air inside water system. At this time, exhaust air
completely through exhaust valve and then turn on the unit. After turning on the unit for 3 minutes, fan and
compressor will start automatically.
