12
6. Measure from the tip of the shaft to the top surface of
the black pointer; the measurement should be 3.75 --
3.88 in. (95 -- 99 mm).
7. Tighten the locking screw to secure the shaft to the
NFD.
8. Turn the handle to the OFF position with red arrow
pointing at OFF.
9. Install the handle on to the painted cover horizontall y
with the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws
and lock washers supplied.
11. Engaging the shaft into the handl e socket, re--install
(3) hex screws on the NFD enclosure.
12. Re--install the unit front panel.
C12279
Fig. 11 -- Handle and Shaft Assembly for NFD
Units Without Factory-Installed
Non--Fused Disconnect —
When installing units, provide a disconnect switch per N EC
(National Electrical Code) of adequate size. Disconnect
sizing data is provided on the unit informative plate. Locate
on unit cabinet or within sight of the unit per national or
local codes. Do not cover unit informative plate if mounting
the disco nn ect on the unit cabinet.
All Units —
All field wiring must comply with NEC and all local
codes. Size wire based on MCA (Minimum Circuit Amps)
on the unit informative plate. See Fig. 9 and the unit label
diagra m for power wiring connections to the unit power
terminal blocks and equipment ground. Maximum wire
size is #2 ga AWG (copper only) per pole on contactors.
Provide a ground-fault and short-circuit over-current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refe r to unit informative data plate for
MOCP (Maxim um Over-current Protection) device size.
All field wiring must comply with the NEC and local
requirements.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is to
be connected to a 208-v power supply, the control
transformer must be r ewired by moving the black wir e with
the
-in. female spade connector from the 230-v connection
and moving it to the 208-v
-in. male terminal on the
primary side of the transformer. Refer to unit label diagram
for line-side information . Field pow er wires will be
connected line--side pres s u re lugs on the pow er terminal
block or at factory--installed option non--fused disconnect.
NOTE: Check all factory and field electrical connections
for tightness.
Affix the crankcase heater warning sticker to the unit
disconnec t switch.
Voltage and Current Balance —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 7. On 3-phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use
the formula shown in the lege nd for Table 7, Note 4 (see
page 15) to de termine the percent of voltage imbalance.
Operati on on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalida te
any applicable Carrier warranty.
Convenience Outlets —
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Tag-out this switch, if necessary.
!
WARNING
Two types of convenience outlets are offered on 38AU
models: Non-powered and unit-powered. Both types
provide a 125-volt GFCI (ground-fault circuit-interrupter)
duplex receptacle rated at 15-A behind a hinged
waterproof access cover, located on the end panel of the
unit. See Fig. 12.
Control Box
Access Panel
Pwd-CO
Transformer
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
C10936
Fig. 12 -- Convenience Outlet Location
38AU
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