17
Connect field power supply conductors to LINE side ter-
minals when the switch enclosure cover is removed to attach
the handle.
Field-Install the NFD Shaft and Handle
1. Remove the Control Box access panel. The NFD enclo-
sure is located below the Control Box (see Fig. 27).
2. Remove (3) cap head screws that secure the NFD enclo-
sure front cover — (2) on the face of the cover and (1) on
the left side cover. See Fig. 28.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at OFF
position (the arrow on the black handle knob is at OFF).
5. Insert the shaft with the cross pin on the top of the shaft
in the horizontal position. See Fig. 28.
6. Measure from the tip of the shaft to the top surface of the
black pointer; the measurement should be 3.75 to 3.88 in.
(95 to 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 horizontally
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 handle socket, re-install (3)
hex screws on the NFD enclosure.
12. Re-install the unit front panel.
Fig. 27 — NFD Enclosure Location
Fig. 28 — NFD Handle and Shaft Assembly
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT
When installing units, provide a disconnect switch per
NEC (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
disconnect 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. 25 and the unit label dia-
gram for power wiring connections to the unit power terminal
blocks and equipment ground. Maximum wire size is #2ga
AWG (copper only) per pole on contactors. See Fig. 25 and
unit label diagram for field power wiring connections.
Provide a ground fault and short circuit over-current pro-
tection device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maxi-
mum Over-Current Protection) device size.
All units except 208/230v units are factory wired for the
voltage shown on the nameplate.
If the 208/230v unit is to be
connected to a 208v power supply, the control transformer
must be rewired by moving the black wire with the
1
/
4
-in. fe-
male spade connector from the 230v connection and moving
it to the 200v
1
/
4
-in. male terminal on the primary side of the
transformer. Refer to unit label diagram for additional infor-
mation. Field power wires will be connected at line-side pres-
sure lugs on the power terminal block or at factory-installed
option non-fused disconnect.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the formula shown in the ex-
ample below to determine the percent of voltage imbalance.
Operation on improper line voltage or excessive phase imbal-
ance constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any applicable
Carrier warranty.
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
NOTE: Check all factory and field electrical connections for
tightness.
Average Voltage
=
(224 + 231 + 226)
=
681
=
227
3
3
% Voltage Imbalance = 100x
4
=
1.78%
227
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact
your local electric utility company immediately.
A
B
C
MOTOR
Summary of Contents for WeatherMaker 48FC04-07
Page 4: ...4 Fig 2 Unit Dimensional Drawing 1018 ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing cont 1018 ...
Page 6: ...6 Fig 2 Unit Dimensional Drawing cont 1018 ...
Page 24: ...24 T Fig 42 Typical 48FC 04 07 Power Wiring Diagram 208 230V Unit Shown ...
Page 26: ...26 Fig 45 Typical IGC Control Wiring Diagram UNIT CONTROL BOARD ...