Carrier 09DK Series Installation, Start-Up And Service Instructions Manual page 12

09DK044 66/34% Circuiting Modification — To configure
the 09DK044 for two refrigerant circuits (one with 66% ca-
pacity and one with 34% capacity) using field supplied parts,
perform the following steps:
1. Remove all plastic caps. Refer to Fig. 14.
2. Attach following parts as shown in Fig. 14. Perform
phos-copper brazing on all field-made connections
while protecting adjacent joints from heat.
a. Construct the 66% gas tubing assembly (Item A),
consisting of the following parts, and braze it into
gas headers as shown in Fig. 14, Item A:
2 — 1 1 / -in. OD tubes (cut to length as required)
8
2 — 1 1 / -in. 90° long-radius elbows
8
1 — 1 / -in. tee (see note at right)
1
8
3 — 1 1 / -in. OD nipples (cut to length as required)
8
b. Construct the 66% liquid tubing assembly
(Item B), consisting of the following parts, and
braze it into liquid headers as shown in Fig. 14,
Item B:
2 — 5 / -in. OD tubes (cut to length as required)
8
2 — / -in. 90° long-radius elbows
5
8
1 — 5 / -in. tee (see note at right)
8
3 — 5 / -in. OD nipples (cut to length as required)
8
PLASTIC CAPS REMOVED FROM UNIT
A
B
FIELD-SUPPLIED PARTS ADDED TO UNIT
Fig. 14 — 09DK044 Unit with 66/34% Circuiting
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c. Plug the open 1 1 / -in. diameter stub tube on the
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right gas header and the open
tube on the right liquid header as shown in Fig. 14,
Item C. Parts required:
1 — 1 1 / -in. plug fitting
8
1 — 5 / -in. plug fitting
8
NOTE: Diameter of tee's interconnecting pipe
opening is dependent upon interconnecting system
piping diameter. Refer to Carrier system Design
Manual, Part 3 for hot gas and liquid pipe sizing
information.
3. Install or replace filter drier(s). Before charging the
system, install or replace filter drier(s) connected to
the liquid line near the indoor unit to prevent contami-
nation in the system.
C
C
/ -in. diameter stub
5
8