Johnson Controls YVAHP0721CW Series, Service Manual

Page: 29 / 416

SM-16007
1-15
INSTALLATION
3.6 Caution about Outdoor Unit Installation
When the installation and piping work for the multiple outdoor units are performed, it is required that the
arrangement for outdoor units and piping length be determined. Perform the installation work in strict
accordance with the following restrictions.
< Restrictions for Two and Three Units Combination >
(1) When using a combination of two and three outdoor units, align the outdoor units from largest capacity
to smallest as A > B > C and outdoor unit “A” connected to the piping connection kit 1.
(2) The piping length between the piping connection kit 1 and the outdoor unit should be
La < Lb < Lc < 32.8 ft (10m).
>
>
>
>
C
B A
C
B A
L
c
L
c
L
b
L
b
L
a
L
a
Piping Direction Piping Direction
Indoor Unit
Side Indoor Unit
Side
Piping Connection Kit 1
Piping Connection Kit 1
Piping Connection Kit 2
Piping Connection Kit 2
: Maintain a straight-line distance of 19-11/16 inch (500mm) or more for piping after the piping connection kit.
Outdoor Unit
A
Outdoor Unit
B
Outdoor Unit
C
Outdoor Unit
C
Outdoor Unit
B
Outdoor Unit
A
NOTICE
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of the outdoor unit.
When installing a combination unit, a piping connection kit is needed for each additional unit but not for the
base unit: (72, 96 types).
NOTE:
The piping connection kit (MC-NP**A1) consists of branch pipes for gas and liquid.
Interconnecting pipe is not included in these kits (Field-Supplied).
Applicable Outdoor Unit
Model Piping Set
Outdoor Unit Capacity (MBH) Outdoor Unit Number
144 - 192 2 MC-NP20A1 1
288 3 MC-NP30A1 1
3.7 Piping Work between Outdoor Units