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Start
Fig. 008
Fig. 003
Fig. 006
Fig. 005
Use
Clamp
on Amp Meter to
test
Amperage
of input power
supply to the fan coil.
(Fig. 008)
PSB Circuit Board
&
WEG
Drive
functioning correctly
Motor
running?
Motor
working correctly
Call Technical Support @
1-888-652-2219.
PSB circuit board is
working correctly -
Replace
WEG controller
17
16
15
14
18
Y
N
Y
N
Call Technical Support Toll
Free 1-888-652-2219
Amperage
> 2A
(1 amp @ 220-240 volt AC)
Voltage Present
? (0-10VDC)
VDC > 9VDC
PSB Circuit Board
is
Functioning Correctly
Increase
appropriate PSB
trimpot
1/2 turn Clockwise
-
Wait
30 seconds
for
motor to adjust
Voltage
present?
Continue to
Step 11
1
10
12
Y
Y
N
N
11
Ensure
Transformer
is
connected properly
Inspect
Supply Voltage
-
Return to
Step 5
Supply Power
Present?
Verify that
24VAC
is
present between
R & C
on
the PSB circuit board
(Fig. 005)
Verify that
24VAC
is
present between
C &
desired T-Stat
setting
Ensure that
Jumper
is installed correctly
(Fig. 001)
Replace
Transformer
Turn off
Supply Power
, connect
transformer, turn on power -
Return to
Step 6
Call Technical Support
Toll Free 1-888-652-2219
Install
Jumper
and
return to
Step 7
9
8
7
6
5
Verify that
Main Supply Voltage
is
present on the PSB circuit board
between the
L and N terminals
(Fig. 004)
4
Power
Fan Coil
3
N
N
N
Y
Y
Y
N
Y
N
N
Y
Unplug Motor Leads
and
test resistance (ohms)
between Windings
(Figs. 002 & 003)
Jumper desired Tstat setting
with
R
on the PSB Circuit Board
(Fig. 001)
Verify that
Pressure Sensing
section
of PSB is functioning properly
by measuring
Voltage Output
(Volts DC) @ the WEG controller,
terminals
7 & 8
(Fig. 006)
2
Y
Call Technical Support
Toll Free 1-888-652-2219
X
If R
esistance
is outside of the
acceptable range
(6.5 - 10.5 ohms) or uneven
across any winding legs,
call Technical Support
Toll Free @ 1-888-652-2219
-
If
Resistance
is acceptable,
re-connect
Motor Leads
and
continue to
Step 3
Adjust Trimpots
on PSB
Circuit Board until airflow is
running at desired speed
*See
System Commissioning
and Set-Up.
Continue adjustments
until
VDC > 9VDC
-
Return to
Step 12
Resistance
should be
equal
between all
Windings
. Black to
Red, Black to White and Red to
White.
Resistance
should be:
6.5 - 10.5 ohms
Troubleshooting - Motor Running Too Slow
-44-
Module HE-Z DIA Diagnostics &
Trouble Shooting (3/8)
Module DIA Diagnostics & Trouble Shooting (3/8)
Fig. 002
Fig. 001
Input Voltage
and
T’Stat section
on PSB is functioning correctly
Ensure that
Volt Meter
is set
to read
Volts DC
- Test
Voltage on opposite end of
Cable
(Fig. 007)
Fig. 007
Fig. 004