Myron L 729II - Manual (Page 35)

b. Temperature Set Point Adjust
1. Ensure power OFF.
2. Ensure the SCO Module Set Point control is set to FULL
counter clockwise position. If not, turn SCO Set Point
control fully CCW - it may be 30 turns - or until it clicks.
For location see figure III.C.13.
3. Turn power ON.
4. Press BOTH the Temperature Select switch and the Set
Point switch on the front panel.
5. Adjust the TP/TPO Module Set Point Two (SP2) to
temperature as desired. See figure III.C.1.
6. Turn power OFF.
c. Hysteresis
Hysteresis is fixed at ~±6°C unless Special Ordered with
adjustable control.
Hysteresis with adjustable control is variable from ±0.6 to 6°C,
see figure III.C.1 for location.
CAUTION: Adjusting the hysteresis too narrow may cause the
alarm to fluctuate (on-off) due to temperature variations causing
the relay to chatter. This condition is to be avoided, it may
damage the heater, chiller, etc. and will eventually damage the
relay.
REASSEMBLY
1. Carefully reinstall the front panel, bottom first. Ensure no
wires have been pinched between enclosure and front
panel.
2. Reinstall the screws and tighten.
3. To operate, turn power ON.
31
FS
INC
INC
TEMP
CONTROL
HARNESS
SET POINT
CONVERSION (SPC)
DEC DEC
SPC
Figure III.C.12
SPC
INC
PA
SCO SET POINT #2 ADJUST
(TURN CONTROL FULL CCW)
CM
NO NC
Figure III.C.13
SC/SCO MODULE
(SECOND ALARM/CONTROL)
MAIN CIRCUIT BOARD NOT SHOWN FOR CLARITY
COM
RELAY #2
}
NO
NC