Myron L 729II - Manual (Page 40)

front as shown in figure III.D.2.
c. Remove harness from SCO Module by pulling on
harness, see figure III.D.3.
d. Set SCH harness aside, it is no longer used.
4. Remove SPC jumpers (2) from SC/SCO Second
Alarm/Control Module, see figure III.D.3 for SPC jumper
location.
5. Install TH/THO harness to front panel, figures III.D.12 &
III.D.13.
a. Install THO Set Point Switch to the UPPER CENTER
switch location, figure III.D.12, keeping in mind the
“O-ring” warning above. See figure III.D.4 for switch
reassembly.
b. Press RED LED into the UPPER location, as shown
in figure III.D.12.
6. Install TH/THO harness to SC/SCO, figures III.D.7 &
III.D.8.
a. Attach BLACK 90° connector with four wires to SPC
location with the connector 90° to the SCO as
shown in figures III.D.7 & III.D.8.
b. Press WHITE connector with two wires and one
jumper into the SCO - it is directional, as shown in
figures III.D.7 & III.D.8.
7. The GREEN LED stays in the same location.
36
FRONT PANEL
Rear View
INSTALL THO
HARNESS
RED LED
INSTALL THO
HARNESS SET
POINT SWITCH
Green
LED
LOW
REINSTALL
PRIMARY
SET POINT
SWITCH
REINSTALL
PRIMARY
RED LED
FS ZERO DIS SP2 HYS2
DISPLAY CONNECTION
DISPLAY
SELECT
TEMP
CONTROL
HARNESS DISPLAY
BRN
BLU
+
0-5VD
-
INC
INC
DEC
TEMP
SENSOR
TP/TPO - TEMPERATURE MODULE
DEC DEC
BR
B
L
O
R
-
+
SPC
Figure III.D.6
TEMP
CONTROL
HARNESS
FS ZERO DIS SP2 HYS2
DISPLAY CONNECTION
DISPLAY
SELECT
SET POINT SWITCH
(LOWER FRONT PANEL)
SCO MODULE CONNECTOR
(SPC ON SECOND ALARM/CONTROL)
DISPLAY
TEMP
SENSOR
BRN
BLU
+
0-5VDC
INC
INC
DISPLAY SWITCH
(UPPER FRONT PANEL)
BROWN THO CONNECTOR
TP/TPO MODULE WITH DISPLAY
AND TH/THO HARNESS
-
TP/TPO - TEMPERATURE MODULE
Figure III.D.9
SPC
DEC DEC
BR
B
L
OR
- +
SPC
INC
PA
SCO SET POINT #2 ADJUST
SCO SET POINT #2 ADJUST
(TURN CONTROL FULL CCW)
CM
NO NC
Figure III.D.7
SC/SCO MODULE
(SECOND ALARM/CONTROL)
MAIN CIRCUIT BOARD NOT SHOWN FOR CLARITY
COM
RELAY #2
}
NO
NC
INSTALL THO HARNESS WHITE
CONNECTOR HERE
INSTALL THO HARNESS
BLACK CONNECTOR HERE
Figure III.D.8
WHITE
CONN
BLACK
CONN
PA
SC/SCO MODULE
THO HARNESS