Air Leakage Test, Vacuum And Refrigerant Charge - McQuay MDS080B R Installation Manual

User can cancel the address code setting by remote controller: The same way to enter the set mode. Set the running mode of the indoor
unit as "FAN", choose Low Fan mode, then press the "OPEN" button of the remote controller, the address code set by remoter controller be
canceled. After cancel the address code set by remote controller, the address code of the indoor unit depends on the SW2 switch setting on the
control module PCB board. When setting completed, the indicator light of unit will be OFF and the mode of indoor unit is OFF;
8． ． ． ． 7 Setting automatic-start when power transmission
Press the "KEY1" on the indoor unit PCB ("ON/OFF" on MWM-T series) for 5s to enter the set mode. Set the running mode of the unit as
"FAN" with the remote controller and choose High Fan mode, then press the "OPEN" button of the remote controller. When setting completed, the
indicator light of unit will be OFF and the mode of indoor unit is OFF;
● Cancel automatic-start function when power transmission
Enter the set mode, Set the running mode of the unit as "FAN" with the remote controller and choose mid Fan mode, then press the "OPEN"
button of the remote controller. When setting completed, the indicator light of unit will be OFF and the mode of indoor unit is OFF;
Note: If entered the set mode but have no operation more than 60s, it will quit the set mode;
8． ． ． ． 8 Setting address code with wired controller
Firstly, set the mode of the wired controller as "OFF", then press the MODE key 5s to enter the address code-setting-mode, it will display
the address code setting in the wired controller and the address code of the indoor unit; Press the key " △" or " ▽" to set the code(00~47), press
the key "ON/OFF" to confirm the code set; Press each other key to quit the code-setting-mode;
a) In initial state the Indoor address code is according to the SW2 switch setting;
b) When entering the wired controller address code-setting-mode first time, the wired controller will read the SW2 switch setting code value
and get this value as its setting value, user can press the key " △" or " ▽" to change it; Simultaneous the SW2 switch setting is invalid;
c) Enter the wired controller address code-setting-mode, press the key " △" or " ▽" , when the displayed value is "– –", then user can press the
key "ON/OFF" to cancel the address code set by the wired controller; After cancel the wired controller setting the SW2 switch take effect;
d) The setting address code value is stored in the register in the indoor controller, so change the wired controller or cut the power supply will
have no effect with the code value;
Setting automatic-start when power transmission: Turn the switch OP2 of the wired controller PCB board to "ON" or "OFF", the
auto-start function when power transmission is activated or inactivated;

9 Air leakage test, Vacuum and Refrigerant charge

9． ． ． ． 1 Air leakage test
To conduct the air leakage test, to shut off the ball valve firstly,
and to increase the pressure of outdoor units as shown as right:
When conducting the air leakage testing, please follow up the
followings rule, to avoid the pollute the lubricating oil;
Charging Nitrogen gas
1)Nitrogen gas (For R22 units ： 2.94Mpa),waiting for 24 hours, and observe if the
pressure is not drop, the units pass the air tightness testing; if pressure decrease, to use
soap water to detect the leakage point;
2) After charging the nitrogen gas, to use soap water to the part of welding, flange and
connection position , to see if there is any bubble occurred;
3) After air leakage testing, clear the soap water;
To use refrigerant and nitrogen gas
pressure to0.2MPa ， to use nitrogen gas to reach the designed
1)To increase the
pressure (for R22, 2.94Mpa); Do not increase the pressure in one step, do it slowly and
meanwhile to observe the if there is pressure drop;
2)To use electrical equipment to detect the leakage part, such as welding part, flange
etc;
3)To use leakage detector and bubble testing at the same time;
9． ． ． ． 2 Vacuum
● Before conducting vacuum, it shall shut off all ball valve ;
Time for vacuum shall last more than 25 hours at pressure 650Pa;
● It is not allowed to use refrigerant to vacuum;
● To only use the vacuum pump with the reserve valve;
9． ． ． ． 3 Charging the refrigerant
● ● ● ● When need to charge additional refrigerant
To charge additional refrigerant due to piping;
Air leakage testing procedure
LEAKAGE TEST SKETCH
to indoor unit
to indoor unit
nitrogen
LO
Do not use oxygen to increase the pressure
to avoid explosion;
1)It is not allowed to use other refrigerant
2)Do not use halogen blow tube (leakage can
not be detected);
VACUUM SKETCH
to indoor unit
to indoor unit
LO
vacuum
pump
check valve
service port
ball valve
liquid pipe
gas pipe
ball valve
outdoor
HI
unit
pressure gauge
Remark
service port
ball valve
liquid pipe
gas pipe
ball valve
outdoor
HI
unit
compound
pressure gauge
©2005 McQuay International
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