Gree ULTRA heating GMV5 Multi VRF Series Service Manual page 90

Ultra Heating GMV5 Multi VRF
for North America
(1) The refrigerant amount charged before delivery doesn't include the amount that needs to be added
to indoor units and the connection pipeline.
(2) Length of connection pipe is decided on site. Therefore the amount of additional refrigerant shall be
decided on site according to the dimension and length of field-installed liquid pipe.
(3) Record the amount of additional refrigerant for convenience of after-sales service.
Calculation of the amount of additional refrigerant
Calculation method of the quantity of additional refrigerant (based on liquid pipe)
Quantity of additional refrigerant = ∑length of liquid pipe X quantity of additional refrigerant
per meter(39-3/8inch)
Diameter of
liquid pipe
Φ22.2(7/8)
(mm/inch)
kg/m 0.35
oz/inch 0.314
NOTICE! Liquid pipe that is within 20m
refrigerant.
First confirm that there is no leakage from the system.When compressor is not working,
charge additional R410A with specific amount to the unit through the filling opening of the
liquid pipe valve of the outdoor unit. If required amount cannot be quickly filled due to
pressure increase of the pipe, then set the unit in cooling startup and fill refrigerant from the
low pressure check valve of the outdoor unit.
(4) Calculation example
Indoor unit
：
No. IDU ①
Duct type GMV-ND18PLS/
Model
A-T(U)
Liquid pipe:
No.
Pipe size φ9.52mm(3/8inch)
Length 10m(32-3/4feet)
No.
Pipe size φ9.52mm(3/8inch)
Length 3m(9-3/4feet)
Total length of each liquid pipe
φ9.52:A+B+C+a=10+5+5+3=23m(75-1/2 feet)
φ6.35: D+b+c+d=5+3+2+1=11m(36feet)
88
NOTICE
Φ19.05(3/4) Φ15.9(5/8)
0.25 0.17
0.224 0.152
65-5/8feet) doesn't need to be added with
(
ODU
IDU
IDU ②
Duct type GMV-ND12PLS/
A-T(U)
A B
φ9.52 mm(3/8inch)
5m(16-3/8feet)
a b
φ6.35 mm(1/4inch)
3m(9-3/4feet)
Φ12.7(1/2) Φ9.52(3/8)
0.11 0.054
0.099 0.048
IDU ③
Duct type GMV-ND09PLS/
Duct type GMV-ND09PLS/A-T(U)
A-T(U)
C
φ9.52 mm(3/8inch)
5m(16-3/8feet)
c
φ6.35 mm(1/4inch)
2m(6-5/8feet)
Φ6.35(1/4)
0.022
0.020
IDU ④
D
φ6.35 mm(1/4inch)
5m(16-3/8feet)
d
φ6.35 mm(1/4inch)
1m(3-1/4feet)