Specification Of Connection Pipe; Electric Wiring Work; Wiring Precautions - Johnson Controls R SERIES Installation And Maintenance Manual

an oil bend should be employed for every 6m (19-2/3 feet).

4.2 Specification of Connection Pipe

Size of Fitting Pipe
Item
mm (inch)
Model
Liquid
DHR18CSB21S
6(1/4)
DHR24CSB21S
DHR30CSB21S
9.5(3/8)
DHR36CSB21S
DHR42CSB21S
DHR48CSB21S
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.

5. ELECTRIC WIRING WORK

5.1 Wiring Precautions

. Before obtaining access to terminals, all supply circuits must be disconnected.
. The rated voltage of the unit is as shown as Table 1-4-1 and Table 1-4-2
. Before turning on, verify that the voltage is within the 187~252V range (for single phrase units).
. Always use a special branch circuit and install a special receptacle to supply po wer to the air conditioner.
. Use a special branch circuit breaker and receptacle matched to the capacity of the air conditioner.
. 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.
. Perform wiring work in accordance with standards so that the air conditioner can be operated safely and positively.
. Install a leakage special branch circuit breaker in accordance with the related laws and regulations and electric
company standards.
Oil bend
Indoor
Figure 3-3-8
Table 3-3-3
Max. Pipe
Length
m (feet)
Gas
12.7(1/2) 20(65-3/5)
30(98-2/5)
30(98-2/5)
16(5/8) 30(98-2/5)
50(164)
50(164)
33
Outdoor
Oil bend
Max. Height Difference
between Indoor Unit and
Outdoor Unit
m (feet)
15(49-1/5)
15(49-1/5)
15(49-1/5)
15(49-1/5)
30(98-2/5)
30(98-2/5)
Drainage pipe(Outer
Diameter × wall
thickness)
mm (inch)
Φ17×1.75(Φ5/8 × 7/100)
Φ17×1.75(Φ5/8 × 7/100)
Φ17×1.75(Φ5/8 × 7/100)
Φ17×1.75(Φ5/8 × 7/100)
Φ17×1.75(Φ5/8 × 7/100)
Φ17×1.75(Φ5/8 × 7/100)