PAGE 5
Enthalpy and Temperature (See Figure 9)
The combination mode of operation will activate the Start
Stop Jog sequence when the Enthalpy meets the control
curve setpoint and the outside air temperature is between
the Low and High temperature setpoint.
2.
Remove control access panel and apply jumper to low
voltage terminal strip at “1” and “3”.
3.
Restore power to unit. Observe MV drive motor for
wheel and both blowers are running.
4.
Verify that the MV blower motors are set to “high”
speed for correct speed and operation.
A - Blower Speed Ad just ment
Blower speed selection is accomplished by changing the
speed selection switch on terminal strip in control box.
Both fresh air and exhaust air blowers are direct drive
multi-tap motors. Both blowers are factory set at “high”
speed for maximum airflow. To determine air flow setting,
external static pressure readings will need to be read
across the MV.
B - Air Bal anc ing Ad just ment
1.
Remove plastic plugs in door panels(4 total).
2.
With a manometer measure pressure drop [inches of
water column] across left half of MV(top and bottom
holes in door panel). Unit CFM is determined then by
referring to
Table #2
.
3.
Repeat the same process for the right half of MV.
4.
Place plastic plugs back in to door panels.
XI - Main te nance
1.
All motors use prelubricated sealed bearings; no
further lubrication is necessary.
2.
Make visual inspection of filters, motor assemblies
and MV rotating bearings during routine maintenance.
3.
Filters should be checked periodically and cleaned
when necessary. Filter is located in front of MV unit
and before blower cabinet.
4.
MV segment is positioned on a shaft extended from
middle support bar. Annual inspection of the self
cleaning wheel is recommended. With power
disconnected, remove MV access panels and unplug
[J150 & P150]
(Refer to wiring diagram in this
instruction manual).
Then remove wheel cassette
from cabinet by sliding assembly out of support tracks
Figure 6
LED and Test Switch
There is a +5V LED indicating the module is wired and
powered properly. If the LED is not illuminated check the
wiring and power supply. The SSJ LED indicates when the
SSJ module has entered the start stop jog sequence. The
RELAY LED illuminates when the relay is activated cutting
power to the relay contacts.
The pushbutton on the module is used to test the relay.
When the pushbutton is activated the LED under the
button illuminates. The LED indicates test mode of the
relay is operating. The SSJ sequence will not operate while
the module is test mode.
Re cov ery Wheel Mode
On a call for operation the MV media will rotate between
intake air and exhaust air streams. Both the intake air
blower and exhaust air blowers will also be operating to
overcome the air resistance of the MV media.
X - Sys tem Check
1.
Disconnect MV main power.
C25 / MV250 Cab i net
Ex ter nal Static Pres sure
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
CFM
Low
498
479
459
435
411
384
347
307
263
218
175
High
592
565
530
496
463
431
398
356
311
262
218
C45 / MV450 Cab i net
Ex ter nal Static Pres sure
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
CFM
Low
656
640
625
609
590
570
552
538
511
477
440
Me dium
729
708
690
671
649
627
605
582
560
530
495
High
783
765
740
721
700
678
650
622
598
580
560
C75 / MV750 Cab i net
Ex ter nal Static Pres sure
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
CFM
Low
823
822
821
819
808
790
778
762
755
738
718
Me dium
997
992
985
975
960
940
928
905
884
872
850
High
1162
1145
1130
1104
1095
1090
1068
1047
1020
998
967
Table #2
