Carrier AERO 39MN Installation, Start-Up And Service Instructions Manual page 124

WHEEL SIZE
105
122
135
150
165
182
200
222
245
270
300
330
365
402
WHEEL OVERLAP
a39-4388
Fig. 108 — Fan Wheel Bushing Location
5. Turn the fan wheel by hand to ensure no contact with inlet
cone.
6. If provided with piezometer ring, verify all tubing connec-
tions are secure.
7. Ensure VFD has been programmed with the correct maxi-
mum fan speed and maximum output frequency to limit
motor speed (rpm) to fan maximum speed (rpm).
a. See label on fan sled for maximum fan speed (rpm).
b. Check VFD for maximum fan speed (parameter
2002) to ensure that the fan maximum speed is the
VFD maximum speed.
c. Using the Parameters Mode (page 102) on the VFD,
verify that parameter 2002 has been changed to the
value shown on the fan label. If it does not match,
DO NOT start the unit. Press Edit (Soft Key 2) to
enter correct value for parameter 2002. Press Exit
(Soft Key 1).
d. See motor nameplate for operating frequency (Hz)
and speed (rpm).
WHEEL - CONE OVERLAP (in.)
0.12 - 0.29
0.12 - 0.32
0.12 - 0.34
0.19 - 0.41
0.25 - 0.47
0.31 - 0.50
0.38 - 0.57
0.44 - 0.63
0.50 - 0.69
0.56 - 0.76
0.62 - 0.88
0.75 - 0.96
0.81 - 1.13
0.88 - 1.26
FAN WHEEL
BUSHING BOLTS
e. VFD maximum frequency setpoint (parameter 2008)
= motor frequency (Hz) * fan max speed (rpm) /
motor nominal operating speed (rpm). Example:
Motor Frequency = 60 Hz
Fan Max Speed = 2979 RPM
Motor Nominal Operating Speed = 1760 RPM
Max Frequency Setpoint = 60 HZ * 2979 RPM /
1760 RPM = 101 Hz
f. Using the Parameters Mode (page 102) on the VFD,
verify that parameter 2008 has been changed to the
calculated value. If it does not match, DO NOT start
the unit. Press Edit (Soft Key 2) to enter correct
value for parameter 2008. Press Exit (Soft Key 1).
TWO-FAN ARRAY DIRECT DRIVE PLENUM FANS —
Start-up procedures for 2-fan arrays are similar to those for
single direct-drive fans as described in the previous sections,
with the following additions:
1. Start-up procedures must be completed for both fans.
2. If VFD(s) is mounted on fan bulkhead panel at a shipping
split, then the VFD remote keypad assembly is shipped in-
side the fan section. See Fig. 109.
a. Install bracket with keypad by removing an existing
screw from the cover on the vertical frame on the
mating section, taking care to avoid all door latch
areas.
b. Position bracket so that VFD remote keypad is
upright, and attach bracket by re-installing the
removed screw.
c. Plug VFD extension cable into the remote keypad
and the VFD.
d. Coil excess cable, secure with wire tie, and route
cable away from fan inlet. Secure with wire ties and
screws.
3. If motors are controlled by a single VFD, then start-up pro-
cedures must be performed for both VFDs.
4. If motors are controlled by a single VFD, then verify that
both overlaods in the Motor Circuit Protection box are set
to the motors' FLA.
5. Fan block-off plate, if ordered, is placed in the fan section
for shipment. Remove the plate from the section and store
in a safe place.
KEYPAD FROM
VFD
MATING SECTION
FRAME
Fig. 109 — Remote Keypad Assembly Location
123
EXTENSION CABLE
TO VFD
BRACKET
39MA51000191
FAN SECTION
BULKHEAD
FAN SECTION
FRAME
a39-4418