Page is loading ...
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53400011-01 Printed in U.S.A. Form 40W-3SI Pg 1 6-15 Replaces: New
Installation Instructions
Part Number 40WA900011
CONTENTS
Page
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1,2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Piping to Indoor and Outdoor Units. . . . . . . . . . . . . . . 2
• CONNECTING PIPING
Drain Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
• ROTATING DRAIN CONNECTION
SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Fol-
low all local electrical codes during installation. All wiring
must conform to local and national electrical codes. Improper
wiring or installation may damage thermostat.
Understand the signal words — DANGER, WARNING,
and CAUTION. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards that could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which would result in minor personal injury or product and
property damage.
Recognize safety information. This is the safety-alert
symbol ( ). When this symbol is displayed on the unit and in
instructions or manuals, be alert to the potential for personal
injury. Installing, starting up, and servicing equipment can be
hazardous due to system pressure, electrical components, and
equipment location.
GENERAL
The branch box accessory for the mini VRF (variable refrig-
erant flow) system allows the connection of multiple indoor
units to an outdoor unit. Each branch box allows 4 indoor unit
connections. The accessory is available for use with the mini
VRF (variable refrigerant flow) system units listed in Table 1.
See Fig. 1 for branch box dimensions. Figure 2 shows an ex-
ample installation.
Table 1 — Branch Box Accessory Usage
INDOOR UNIT SIZES
40WAC Compact Cassette 007,009,012,015
40WAF 4-Way Cassette 009,012,015,018,024,030,048
40WAW High Wall 007,009,012,015,018,024
40WAD Ducted 007,009,012,015,018,024
40WAH High Static 024,030,036,048
40WAU Under Ceiling/Floor 012,018,024,030,036,048
40WAV Vertical 018,024,030,036,048
OUTDOOR UNIT SIZES
38WAH 036,048
7
11
13 ½
10
16
½
¼
a40-1772
58
38
2916 2916 2916
716
1516
58
9316
12 316
1516
5
1
716
18
Fig. 1 — Branch Box Dimensions
NOTE: All dimensions shown
in inches.
40WAC,WAF,WAW,WAD,
WAH,WAU,WAV
Mini VRF (Variable Refrigerant Flow) System
Branch Box Accessory
2
INSTALLATION
Install the branch box between outdoor unit and indoor units.
Branch boxes must be mounted indoors; they are not approved
for outdoor installation. Branch boxes must not be connected
in series. Figure 3 summarizes branch box installation.
Piping to Indoor and Outdoor Units — Mini-
mum straight pipe lengths are shown in Fig. 4 and summarized
below:
• The distance between the outdoor unit and the nearest
pipe bend must be greater than 40 inch.
• The distance between the branch box input connection
and the nearest pipe bend must be greater than
40 inch.
• The distance between the branch box output connection
and the nearest pipe bend must be greater than
20 inch.
• The distance between an indoor unit and and the nearest
pipe bend must be greater than 20 inch.
Maximum pipe lengths and elevation differential are shown
in Fig. 5.
CONNECTING PIPING — Hand-tighten nuts, then tighten
with wrench. Do not exceed the torque limits shown in Table 2.
Table 2 — Torque Limits
Use the adapters provided to connect smaller piping to larg-
er piping, placing a seal (provided) between the adapters. See
Fig. 6. Seal and cap any unused inlet pipes as shown in Fig. 7.
Drain Piping — When installing drain piping, keep the
following points in mind:
• The drainpipe from the branch box must be tightly insu-
lated to prevent condensation.
• Prevent water backflow into the branch box during shut
down by installing the pipe with downward gradient
greater than 1 in. per 100 inches.
• Do not allow the drain pipe to bend or pull on the branch
box. Instead, place pipe supports every 30 in. to
40 inch.
See Fig. 8.
ROTATING DRAIN CONNECTION — The drain connec-
tion on the branch box can be rotated as needed, either before
or after installation. See Fig. 9.
13
3
2
2
222
22
1 – MAIN PIPING
2,3 – BRANCH PIPING
BRANCH JOINT
LEGEND
a38-7439
BRANCH
BOX
OUTDOOR UNIT
INDOOR UNITS
Fig. 2 — Example Usage
PIPE SIZE (Ø in.) TORQUE (ft-lb)
1/412
3/827
1/240
5/851
3/480
3
CONNECT TO OUTDOOR UNIT
INSULATE PIPE
INSULATE PIPE
CONNECT TO 1 TO 4 INDOOR UNITS
HANGING BAR
BRANCH
BOX
a40-1790
Fig. 3 — Branch Box Installation
OUTDOOR
UNIT
INDOOR
UNIT
BRANCH
BOX A40-1792
40 in. MINIMUM
40 in.
MINIMUM
20 in. MINIMUM
20 in. MINIMUM
Fig. 4 — Straight Pipe Minimum Lengths
BRANCH BOX
OUTDOOR UNIT
INDOOR UNIT
65 ft MAX.
OUTDOOR UNIT TO INDOOR UNIT
ELEVATION DIFFERENTIAL
26 ft MAX.
INDOOR UNIT TO
INDOOR UNIT
ELEVATION
DIFFERENTIAL
A40-1791
Fig. 5 — Maximum Pipe Length and Elevation Differential
PIPE LENGTH MAXIMUM PIPING
TOTAL
(ACTUAL) 328 ft L1+L2+L3+
L4+L5
MAXIMUM
PIPING 147 ft
L1+L2
L1+L3
L1+L4
L1+L5
BRANCH BOX
TO INDOOR UNIT 65 ft L2, L3,
L4, L5
ELEVATION
DIFFERENTIAL MAXIMUM
INDOOR UNIT TO
OUTDOOR UNIT 65 ft
INDOOR UNIT TO
INDOOR UNIT 26 ft
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53400011-01 Printed in U.S.A. Form 40W-3SI Pg 4 6-15 Replaces: New
© Carrier Corporation 2015
a40-1793
Fig. 6 — Flare Adapters
a40-1794
Fig. 7 — Capping Unused Pipe
CEILING
HANGING BAR
BRANCH BOX
LEVEL DRAIN PIPE
GRADIENT: 1/100 MINIMUM
DRAIN PIPE
SUPPORTS
a40-1795
30 in. TO
40 in.
Fig. 8 — Drain Pipe Installation
a40-1796
Fig. 9 — Rotating the Drain Connection
/