Carrier 09DK Series Installation, Start-Up And Service Instructions Manual page 11

09DK044 74/26% Circuiting Modification — To configure
the 09DK044 for two refrigerant circuits (one with 74%
capacity and one with 26% capacity) using field supplied
parts, perform the following steps:
1. Remove all plastic caps. Refer to Fig. 13.
2. Attach following parts as shown in Fig. 13. Perform
phos-copper brazing on all field-made connections
while protecting adjacent joints from heat.
a. Construct the 74% gas tubing assembly (Item A),
consisting of the following parts, and braze it into
gas headers as shown in Fig. 13, Item A:
2 —1 3 / -in. OD tubes (cut to length as required)
8
2 —1 3 / -in. 90° long-radius elbows
8
1 —1 / -in. tee (see note at right)
3
8
2 —1 3 / -in. OD nipples (cut to length as required)
8
b. Construct the 26% gas tubing assembly (Item B),
consisting of the following parts, and braze it into
the gas headers as shown in Fig. 13, Item B:
1 — 1 / -in. OD tube (cut to length as required)
1
8
2 — 1 1 / -in. 90° long-radius elbows
8
1 — 1 1 / -in. tee (see note at right)
8
2 — 1 / -in. OD nipples (cut to length as required)
1
8
c. Construct the 74% liquid tubing assembly
(Item C), consisting of the following parts, and
braze it into liquid headers as shown in Fig. 13,
Item C:
2 — 7 / -in. OD tubes (cut to length as required)
8
2 — 7 / -in. 90° long-radius elbows
8
1 — / -in. tee (see note at right)
7
8
2 — 7 / -in. OD nipples (cut to length as required)
8
PLASTIC CAPS REMOVED FROM UNIT
A E
C
E
FIELD-SUPPLIED PARTS ADDED TO UNIT
Fig. 13 — 09DK044 Unit with 74/26% Circuiting
11
d. Construct the 26% liquid tube assembly (Item D),
consisting of the following parts, and braze it into
the gas headers as shown in Fig. 13, Item D:
1 — 5 / -in. OD tube
8
2 — 5 / -in. 90° long-radius elbows
8
1 — / -in. tee (see note below)
5
8
2 — 5 / -in. OD nipples (cut to length as required)
8
e. Plug the two open 1
the gas headers and the two open
stub tubes on the liquid headers as shown in
Fig. 13, Item E. Parts required:
2 —1 1 / -in. plug fittings
8
2 — 5 / -in. plug fittings
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.
B
E
E
D
1 / -in. diameter stub tubes on
8
/ -in. diameter
5
8