©2005 McQuay International
24
REFRIGERANT CHARGING SKETCH
weighbridge
refrigerant
tank
compound
pressure gauge
HI
LO
to indoor unit
to indoor unit
service port
ball valve
liquid pipe
gas pipe
ball valve
outdoor
unit
refrigerant
tank
weighbridge
LO
HI
compound
pressure gauge
outdoor
unit
ball valve
gas pipe
liquid pipe
ball valve
service port
to indoor unit
to indoor unit
●
How to calculate the additional refrigerant weight:
a) Copper tube diameter and additional refrigerant charging:
Liquid specification
φ
19.05
φ
15.88
φ
12.7
φ
9. 52
φ
6.35
R22 additional charging
290g/m
200g/m
120g/m
80g/m
50g/m
b) The calculation format is:
Additional Refrigerant (g)=
φ
19.05length of copper tube(m)
╳
290g/m+
φ
15.88 total length of copper tube(m)
╳
200g/m+
φ
12.7 total
length of copper tube(m)
╳
120g/m +
φ
9.52 total length of copper tube(m)
╳
80g/m+
φ
6.35 total length of copper tube(m)
╳
50g/m
c) Accuracy by 0.1kg;
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●
●
●
Charging refrigerant steps instructions:
a)Before charging, to open all gas and liquid
ball valves;
b)When charging, please turn the bottom up
of the R22 container; as shown as followings;
●
●
●
●
Case study of adding the additional refrigerant
Liquid outside diameter
Additional charging(g/m)
Liquid total length (m)
Additional charging (g)
Total charging (g)
φ
19.05
290g/m
15
4350
φ
15.88
200g/m
20
4000
φ
12.7
120g/m
40
4800
φ
9.52
80g/m
25
2000
φ
6.35
50g/m
20
1000
16150
Total to be charged R22 weight is 16.2kg;
10 Testing Operation
Before trial running, to ensure and check the safety and record the concerned data after units is in stable operation;
10.1 Checking list before trial running
(1) Ampere of indoor & outdoor units is normal and under protection value?
(2) Power supply for indoor and outdoor units?
(3) IP address setting up for indoor units are OK ?
(4) Indoor unit is power on?
(5) Communication wiring is ok?
(6) Bifurcation is well installed?
(7) Condensing water drainage system is OK?
(8) Earthing ?
(9) Insulation testing (10Mega
Ω
)
(10) Power supply check (220-240V/380-415V)
(11) Only after air leakage tested, vacuum can be conducted and refrigerant charged;
(12) How many indoor units are controlled by outdoor unit controller;
(13) Outdoor unit valve is opened not?
10.2 Testing running record table
For the 1
st
time running, shall power on 24 hours in advance, to preheat the crankcase; When shutting off the main electrical power, only
after 2.5 hours later, can restart to run the unit;
No.
Suction
pressure(bar)
Discharge
pressure (bar)
Voltage (V)
Ampere (A)
Suction
temperature(
℃
)
Ambient
Temp.(
℃
)
Checking person /
Time
1
2
3
4
5
6
10.3 Testing running symptoms and analyses:
If the followings failure symptoms happen, please check accordingly
symptoms
Wiring controller
Possible reason
No heating or cooling
Can not select cooling or heating
When one indoors units in heating, all indoors in heating mode
Fan stop when heating
Defrost
Fan stop running when defrosting
Pump keep running
No indication
Pump keep running to drain the water
