OUTDOOR UNIT INSTALLATION FOR SINGLE ZONE APLICATIONS
(REFER TO THE 538K OWNER'S MANUAL FOR MULTIZONE)
Step four: connect indoor and outdoor pipes
1. Remove the screw on the right han-
dle of outdoor unit and then remove
the handle.
4. Tighten the union nut with torque
wrench by referring to the sheet
below.
handle
screw
2. Remove the screw cap of valve and
aim the pipe joint at the bellmouth of
pipe.
gas pipe
liquid pipe
liquid
valve
gas valve
3. Pretightening the union nut with
hand.
union nut
pipe joint
1. Remove the wire clip; connect the po-
wer connection wire and signal control
wire (only for heating unit) to the wiring
terminal according to the
handle
Indoor unit connection
POWER
L1’ S L2’
L2’ G
G
L2
L2
L1 G
L1
(blue)
white
(blue)
whitered
black
(brown)
(brown)
black
(yellow-
green
green)
(yellow-
green
green)
18K
、12K
L2
L1’
L1
L2
L1
Indoor unit
S
Hex nut diameter Tig
40.68~54.24 ft.lb(30~40 N.m)
61.02~74.58 ft.lb(45~55 N.m)
81.36~88.14 ft.lb(60~65 N.m)
94.93~101.7 ft.lb(70~75 N.m)
20.34~27.12 ft.lb(15~20 N.m)
1/4 in (6 mm)
3/8 in (9.52 mm)
1/2 in (12 mm)
5/8 in (16 mm)
3/4 in (19 mm)
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