Testing Running - McQuay MDS080B R Installation Manual

● How to calculate the additional refrigerant weight:
a) Copper tube diameter and additional refrigerant charging:
Liquid specification
R22 additional charging
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;
● ● ● ● 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
φ 19.05
φ 15.88
φ 12.7
φ 9.52
φ 6.35
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 )
(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
st
For the 1 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;
Suction
No.
pressure(bar)
1
2
3
4
5
6
10.3 Testing running symptoms and analyses:
If the followings failure symptoms happen, please check accordingly
symptoms
No heating or cooling
Fan stop when heating
Pump keep running
φ 19.05
290g/m
refrigerant
tank
weighbridge
Additional charging(g/m)
290g/m
200g/m
120g/m
80g/m
50g/m
Discharge
Voltage (V)
pressure (bar)
Wiring controller
Can not select cooling or heating
Defrost
No indication
φ 15.88 φ 12.7
200g/m 120g/m
service port
ball valve
to indoor unit
liquid pipe
gas pipe
to indoor unit
ball valve
outdoor
HI
LO
unit
compound
pressure gauge
Liquid total length (m)
15
20
40
25
20
Suction
Ampere (A)
temperature( ℃ )
Possible reason
When one indoors units in heating, all indoors in heating mode
Fan stop running when defrosting
Pump keep running to drain the water
φ 9. 52
80g/m
REFRIGERANT CHARGING SKETCH
to indoor unit
to indoor unit
refrigerant
tank
HI
LO
weighbridge
Additional charging (g) Total charging (g)
4350
4000
4800
2000
1000
Ambient
Checking person /
Temp.( ℃ )
©2005 McQuay International
24
φ 6.35
50g/m
service port
ball valve
liquid pipe
gas pipe
ball valve
outdoor
unit
compound
pressure gauge
16150
Time