22-VFD Controller (GP board) A133 (Staged- Blower
units)
The GP board A133 controls and monitors the status of
forward rotation and also sends a 0-10VDC signal to the
VFD to control the speed of the blower rotation. A133 also
reports VFD malfunctions to the A55.
23-Second-Stage Power Exhaust Relay K231
(Staged-Blower units equipped with power exhaust)
The second power exhaust fan is controlled by K231.
A133 will enable K231 only when the blower reaches 70%
of full speed (adjustable ECTO). This prevents a nega-
tive building pressure when the blower is operating in low
speed. Refer to the Unit Controller manual and ECTO la-
bels on the unit.
24-Outdoor Fan Transformers T5, T59 (460V & 575V
units)
230VAC transformers are mounted in the control box. The
transformers have an output rating of 0.5A. T5 transformer
supplies 230 VAC power to outdoor fans B4, B5 and B21.
T13 transformer supplies 230V to outdoor fans B22, B23
and B24.
25-Fuse F61 (Higher SCCR units only)
Fuse F61 is used on units with higher SCCR rating. F61
provides overcurrent protection to compressor and other
cooling components. F61 and S48 are located inside a
sheet metal enclosure in the unit left front corner mullion.
CLEAR
COVER
(SHOWN
CLOSED)
STOP
BUTTON
(RED)
RED TEST
BUTTON
(Push To Test)
AMP SETTING
CONTROL
(BLUE DIAL)
TRIP
INDICATION
WINDOW
AMP SETTING
POINTER
BLUE RESET SCREW
(Shown in AUTO position as
shipped from the factory)
LOAD VOLTAGE OUT
DETAIL SHOWING RESET BUTTON
ADJUSTED TO MANUAL POSITION
Lift clear cover and turn adjustment screw
counterclockwise. Reset screw will pop out
when pointer is in M (manual position). Close
cover to lock reset screw into position.
TELEMECANIQUE OVERLOAD RELAY
Lift clear cover to adjust relay amp setting according to value given on the blower motor nameplate. Proper relay
amp setting equals motor nameplate FLA X service factor of 1.15 X .95.
Cover must also be lifted to adjust control mode from automatic reset to manual reset (see detail above) and to
test the control.
ton. A yellow marker should appear in the trip indication window to the right of the amp setting control. Press the
blue reset screw to reset the relay.
The red STOP button opens the normally closed contacts which power the blower motor. This button stops blower
motor operation as long as it is pressed in.
FIGURE 5
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