Johnson Controls YVAHP072B31S, Service Manual

Page: 119 / 1796

8-7/16
25/32
1-17/32
1-9/16
2-1/8
5-15/16 2-15/32
Service Cover for
Electronic Expansion Valve
Low Pressure
Gas Pipe Connection
(
φ
3/4 Flare Nut)
Gas Pipe Connection
(
φ
A Flare Nut)
High/Low Pressure
Gas Pipe Connection
(
φ
5/8 Flare Nut)
Service Cover for
Electrical Box
Electrical Box
(Available for
Both Sides)
Outdoor Unit Connecting Side
1-1/2 11-27/32 1-1/2
14-13/16
Unit: inch
3-7/32
3-1/2
11-27/32 B
7-3/32
7-17/32
4-3/8
31/32
Indoor Unit Connecting Side
Ha
a
c
b
L
Hb
Indoor
Unit
Indoor
Unit
Indoor
Unit
Upstream Downstream
Change-Over
Box
Change-Over
Box
Indoor
Unit
Indoor
Unit
Upstream
Multi-Kit
Downstream
Low Pressure
Gas Pipe
High/Low Pressure
Gas Pipe
Change-Over
Box
Gas Pipe
Service Manual
1-103
INSTALLATION
5.2 Refrigerant Piping Work
3URYLGHWKHUHIULJHUDQWSLSHLQWKH¿HOG
Make sure that the refrigerant pipe is connected to the same refrigerant cycle unit.
(1) Position of Piping Connection
(2) Selecting Piping Size
(a) Select the size for the high/low pressure gas pipe, low pressure gas pipe and gas pipe according
to Table 5.1. The size depends on the indoor unit total capacity connected downstream of the
Change-Over Box.
(b) When the piping size from Table 5.1 and the piping connection size for Change-Over Box from Table
5.2 are different, use an accessory pipe according to the item 5.2(3).
(c) As for the multi-kit branch or header branch, refer to the Technical Manual for the Outdoor Unit.
Dimension
Model
A B
COBS048B21S 5/8 3-1/2
COBS096B21S 3/4 3-25/32
Ɣ 3LSLQJ:RUNIRU&KDQJH2YHU%R[
Perform piping work for the Change-Over Box according to the following table.
Condition of Piping Work
Item Allowable Piping Length
Total Piping Length between
Change-Over Box and Indoor Unit L
a+b+c
COBS048B21S within 98 ft (30m)
COBS096B21S within 32 ft (10m)
Height Difference between
Indoor Units Connected to the Same Change-Over Box
Ha within 13 ft (4m)
Height Difference between Change-Over Boxes Hb within 49 ft (15m)
Table 5.1 Connected Indoor Unit Capacity and Piping Size
Model
Connected
Indoor Unit
Capacity
Low
Pressure
Gas Pipe
High/Low
Pressure
Gas Pipe
Gas Pipe
x1000Btu/h inch (mm) inch (mm) inch (mm)
COBS048B21S
6~17 ݊ (15.88) ݊ (12.7) ݊ (12.7) 7
18~29 ݊ (15.88) ݊ (12.7) ݊ (15.88)
30~41 ݊ (19.05) ݊ (15.88) ݊ (15.88)
COBS096B21S
42~59 ݊ (19.05) ݊ (15.88) ݊ (19.05)
60~71 ݊ (22.2) ݊ (19.05) ݊ (22.2)
7
: When a branch is located downstream of the Change-Over Box
and also the connected indoor unit capacity is 6~17kBtu/h, use
݊LQFK݊PPIRUWKHJDVSLSH
Table 5.2 Piping Connection Size for Change-Over Box
Model
Low
Pressure
Gas Pipe
High/Low
Pressure
Gas Pipe
Gas Pipe
inch (mm) inch (mm) inch (mm)
COBS048B21S ݊ (19.05) ݊ (15.88) ݊ (15.88)
COBS096B21S ݊ (19.05) ݊ (15.88) ݊ (19.05)