Gree GUHD18ND3FO - Specification of Connection Pipe; Electric Wiring Work; Wiring Precautions

U-Match Series DC Inverter Service Manual
85
an oil bend should be employed for every 6m (19-2/3 feet).
Oil bend
Indoor
Outdoor
6m(19-2/3feet)
Oil bend
Figure 3-3-8
3.2 Specification of Connection Pipe
Table 3-3-3
Item
Model
Size of Fitting Pipe
mm (inch)
Max. Pipe
Length
m (feet)
Max. Height Difference
between Indoor Unit and
Outdoor Unit
m (feet)
Drainage pipe(Outer
Diameter × wall
thickness)
mm (inch)
Liquid
Gas
GUHD18ND3FO
6(1/4)
12.7(1/2)
20(65-3/5)
15(49-1/5)
Φ17×1.75(Φ5/8 × 7/100)
GUHD24ND3FO
9.5(3/8)
16(5/8)
30(98-2/5)
15(49-1/5)
Φ17×1.75(Φ5/8 × 7/100)
GUHD30ND3FO
30(98-2/5)
15(49-1/5)
Φ17×1.75(Φ5/8 × 7/100)
GUHD36ND3FO
30(98-2/5)
15(49-1/5)
Φ17×1.75(Φ5/8 × 7/100)
GUHD42ND3FO
50(164)
30(98-2/5)
Φ17×1.75(Φ5/8 × 7/100)
GUHD48ND3FO
50(164)
30(98-2/5)
Φ17×1.75(Φ5/8 × 7/100)
The connection pipe should be insulated with proper water-proof insulating material.
The pipe wall thickness shall be 0.5~1.0mm (1/50~1/25inch) and the pipe wall shall be able to
withstand the pressure of 6.0MPa (870psig). The longer the connecting pipe, the lower the cooling and
heating effect performs.
4 ELECTRIC WIRING WORK
4.1 Wiring Precautions
①. Before obtaining access to terminals, all supply circuits must be disconnected.
②. The rated voltage of the unit is as shown as Table 1-4-1 and Table 1-4-2
③. Before turning on, verify that the voltage is within the 187~252V range (for single phrase units).
④. Always use a special branch circuit and install a special receptacle to supply power to the air conditioner.
⑤. Use a special branch circuit breaker and receptacle matched to the capacity of the air conditioner.
⑥. The special branch circuit breaker is installed in the permanent wiring. Always use a circuit that can trip all the poles
of the wiring and has an isolation distance of at least 3mm (1/8inch) between the contacts of each pole.
⑦. Perform wiring work in accordance with standards so that the air conditioner can be operated safely and positively.
⑧. Install a leakage special branch circuit breaker in accordance with the related laws and regulations and electric
company standards.