5. Lift the unit into place, and fit the hex-head bolts on sides
of indoor unit into mounting slots of mounting brackets
(Fig. 11). Ensure unit is mounted level to assure proper
drainage.
6. Tighten indoor unit hex-head bolts securely.
TO INSTALL REMOTE THERMOSTAT:
If there is at least 3/8 in. of space between the back of indoor
unit and wall:
1. Route remote thermostat wires (field supplied) through
slot in right side of rear panel of indoor unit (Fig. 3).
2. Route wires over refrigerant and drain piping as shown
in Fig. 12.
IMPORTANT: Do not route wires under the piping, or
wires could impede air filter removal.
If there is less than 3/8 in. of space between back of indoor
unit and wall:
1. Cut rear bottom of the right-side panel.
2. Route remote thermostat wires through new opening.
See Step 7 — Install Remote Thermostat section on page 12
for remainder of remote thermostat installation details.
Step 4 — Connect Refrigerant Piping —
Fan coil
units may be connected to outdoor units using field-supplied
refrigerant grade piping. Refer to Tables 3A and 3B for the
correct size piping. The length of refrigerant pipe depends
on the unit placement and building structure; run pipes as
directly as possible. For piping requirements over 50 ft of
total run, or more than 25 ft of lift, consult the long line
application guidelines in the System Product Data literature.
DO NOT BURY MORE THAN 36 IN. OF REFRIG-
ERANT PIPE IN THE GROUND. If any section of pipe
is buried, there must be a 6-in. vertical rise to the valve
connections on the outdoor unit. If more than the rec-
ommended length is buried, refrigerant may migrate to
the cooler, buried section during extended periods of unit
shutdown, causing refrigerant slugging and possible com-
pressor damage at start-up.
To connect piping:
1. Install insulation. Insulate supply and return refrigerant
lines on heat pumps (38QRC) and mult-split condensing
(38HDS) units to prevent condensation. It is extremely
important that all refrigerant lines and the AccuRater
t
metering device be insulated on heat pumps. On 38HDC
cooling only units, the liquid line may be left uninsu-
lated. Use any acceptable heat resistant closed-cell foam
insulation (minimum 3/8-in. wall thickness). When insu-
lating piping, cap ends and slide insulation over the pip-
ing. Insulation can also be cut and placed over piping.
2. Run liquid and gas refrigerant piping.
a. Run pipes as directly as possible, and avoid any un-
necessary turns and bends.
b. Suspend refrigerant pipes so that the insulation is
not damaged and vibrations are not transmitted to the
structure.
c. Leave slack in the refrigerant pipe between the struc-
ture and the unit to absorb vibrations.
d. For 38HDC and QRC systems only, install flare con-
nection on tubing to liquid line at fan coil unit. A pis-
ton is shipped in the AccuRater device body (Fig. 13)
with the 40QA unit. Use Tables 4-6 to verify that you
have the required piston size for the system being
installed.
Fig. 6 — Installing Hex-Head Mounting Bolts
in 40QA Unit
DIMENSIONS (in.)
UNIT 40QA
A
B
C
024
50
15
⁄
16
46
49
5
⁄
8
036
58
13
⁄
16
53
7
⁄
8
57
1
⁄
2
048
71
9
⁄
16
66
5
⁄
8
70
1
⁄
4
060
92
87
90
5
⁄
8
Fig. 7 — 40QA Unit Hanging Dimensions
DIMENSIONS (in.)
UNIT 40QA
B
C
024
46
49
5
⁄
8
036
53
7
⁄
8
57
1
⁄
2
048
66
5
⁄
8
70
1
⁄
4
060
87
90
5
⁄
8
*Exposed mounting holes.
†Reverse bracket holes (concealed mounting).
Fig. 8 — Mounting Template Included
with 40QA Unit
Fig. 9 — Removing Rear Knockout in Side Panel
If Right-Side Piping Connection in Used
7
Summary of Contents for 40QA
Page 20: ...Fig 26 Typical System Wiring Heat Pump Systems 20...
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