Weil-McLain SVF 500 Manual page 72

eleCTriCal
Field Wiring, continued
1
Terminal Block Wiring, continued
E. Outdoor Temperature (ODT) Sensor – Optional
Connector J19
2
1 The control provides programmable options if using an ODT sensor This sensor
is supplied with the boiler
2 Mount the ODT sensor on an exterior wall, shielded from direct sunlight and flow
of heat or cooling from other sources
3 The wire outlet on the sensor must be oriented DOWN to prevent water entry
4 Connect the sensor leads to the terminal shown at right and in Figure 58,
page 66 Thermostat wire can be used to connect the sensor
3
4
F. External Limits – Optional
To cause MANUAL reset: Connector J20 #1 & #2
IMPORTANT
The control will lock out when a limit in its manual reset circuit opens (J20 pins 1 & 2).
The control activates its alarm terminals and shuts the boiler down. An operator (user or
5
technician) must manually reset the control to restart the boiler.
• Remove the factory-installed jumper, and connect isolated contacts of external
limits across J20 pins 1 and 2 The control will enter manual reset lockout when
the limit circuit opens
• To clear the lockout, the manual limit must be closed After manual limit is closed,
the control must be manually reset on the display If the user resets the control while
the manual limit is still open, the control will remain in lockout, and will create a new
instance of the fault
6
To cause AUTOMATIC reset: Connector J20 #3 & #4
IMPORTANT
The control will reset automatically after circuit is interrupted.
7
• Remove factory-installed jumper, and connect isolated contacts of external
limits across J20 pins 3 and 4 The control will shut down the boiler on limit
opening, then automatically restart 150 seconds after the limit closes
8
72
svf series
500/600
230091
Additional
limits if used
(will require
manual reset)
Additional
limits if used
(Control will
automatically
reset)
boiler manual
1
J19
J19
5 5
Outdoor Air
Common
Temperature
6 6
Sensor
J20
Remove jumper if using
J20
external limit devices
1 1
2 2
3 3
4 4
J20
J20
1 1
2 2
3 3
4 4
Remove jumper if using
external limit devices
550-100-273/0523
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