Design Technical Manual

Table Of Contents
NOTES IN CASE OF CONNECTING INDOOR UNIT OF COOLING
ONLY T Y PE
z
Pipe size
Only for discharge gas pipe.
When indoor unit of cooling only type is connected, it calculates with the value except
capacity of cooling only type.

Pipe diameter, in case of discharge gas pipe is not separated, is di󰀨erent between pipes
which come from outdoor unit side and connected to RB unit, Thinner piping diameter
should be selected.
Example
RB
Cooling only
(30000Btu/h)
Heat pump
(36000Btu/h)
Liquid
Suction gas
Discharge gas
Pipe size 3a Pipe size 3b
3a 3b
Discharge gas
5/8" (15.88)
1/2" (12.70)
1/2" (12.70)
Suction gas
7/8" (22.22) 3/4" (19.05)
Liquid
1/2" (12.70) 3/8" (9.52)
Note: Since discharge gas pipe may be selected to the same pipe size as liquid pipe, be
careful of a connection mistake.
- (06 - 43) -
SYSTEM
DESIGN
SYSTEM
DESIGN