Carrier 38AQ034 - Manual (Page 4)

SNUBBER FLANGED
WASHER
. neoprene
SNUBBER
Table 3 — Refrigerant (R-22) Charge and
Piping Selection Data
ISOLATION SPRING
Fig. 4 ~ Compressor Mounting
NOTES
1 For mounting dimensions, see Fig 1.
2 Parts package contains all fasteners required for assem­
bling 20-in. legs to unit
Fig. 5 — Mounting Legs for 38AQ Units
Step 5 — Make Electrical Connections
POWER SUPPLY — Electrical characteristics of avail­
able power supply must agree with nameplate rating.
Supply voltage must be within tolerances shown in
Tableó. See Fig. 6 for System Label Diagram. Phase
unbalance must not exceed 2%. Operation of unit on
improper supply voltage or with excessive phase un­
balance constitutes abuse and is not covered by Carrier
Warranty.
POWER WIRING — All power wiring must comply
with applicable local requirements and National Elec­
trical Codes. Install a field-supplied branch circuit dis­
connect switch of a type that can be locked OFF or
OPEN. Run power wires from disconnect switch through
unit power opening (D on Fig 1 ) and connect to terminal
block
just inside opening. See Table 5 for maximum
allowable wire size.
Power terminal block is in the control box. Remove
outer panel and #10 screw on the door. Swing door open,
remove screws on barrier panel and remove barrier panel.
Replace barrier panel when power wiring is completed.
Condenser fans must rotate clockwise when viewed
from above. If necessary, correct direction of fan rotation
by reversing any 2 power input wires at disconnect switch.
Affix crankcase heater decal to unit disconnect switch.
CONTROL CIRCUIT WIRING — Internal control
voltage on 38 AQ units is both 115-volts and 24-volts. All
control circuit wiring must comply with applicable local
LENGTH OF PIPING (ft)*
OUTDOOR 0-25 26-60 61-100t
UNIT
38AQ
Line Size (in. O.D.)
L V L V L V
024 % 1% % 1% % 1 %
028 % 1% % 1%
V b
2 Va
034 % U/s % 2'/8 % 2'/8
Approximate System Charge (lb)t
024 55 58 75
028 61 65 83
034 71 79 93
L — Liquid Line V — Vapor Line
'Approximately 4 elbows assumed in determining pipe sizes
fMaximum length of interconnecting piping is 100 feet.
^Approximate system charge is for estimating only It includes
charge requirements for one outdoor unit, matching indoor coil,
and interconnecting piping System should be charged in
accordance with installation instructions
NOTE Maximum liquid line size is %-in OD Maximum R-22
system charge is 85 lb (024), 95 lb (028), 105 lb (034)
Table 4 — Minimum Outdoor Air Operating
Temperature
MINIMUM OUTDOOR
UNIT COMPR CONO TEMPERATURE (F)*
38AQ CAP. (%) TEMP (F)
Std Unit
32LT
Motormaster®
024
100 90 28 -20
50 80 41 -20
028
100 90 34 -20
67 80 37 -20
034
100 90 30 -20
67 80 33 -20
'Applies to cooling mode of operation only
Table 5 — Maximum Allowable Field Wire Sizes
UNIT
38Aa
024,028,034
VOLTS
(60-Hz)
WIRE SIZE
208/230 6 AWG to 350 MCM
460, 575 14 AWG to 2/0
CONN.
TB
TB Terminal Block (with integral compression terminal)
and national codes. Route remote control wiring to unit
control box through control opening (C on Fig. 1) and
connect to control terminal block inside the control box.
All external control wiring is 24-volt, NEC Class 2.
SAIL SWITCH — It is highly recommended that an
indoor airflow switch (field installed) be installed and
interlocked with the outdoor unit, to prevent the outdoor
unit from operating in the event of indoor airflow failure
(example: broken fan belt). Operation of compressor with
no
indoor airflow causes compressor to operate in a
vacuum which can damage bearing surfaces. Therefore,
install a field-supplied sail switch in the supply air duct­
work of the mating indoor fan coil unit, and wire to
outdoor unit. See Fig 7.
.4^