Weil-McLain SlimFit 2 Series Manual page 54

SlimFit Series 2
®
Field wiring
(see Figure 52 & Figure 53)
E System supply and return temperature sensors –
Terminal Block P14 #1 & #2
1. Two strap-on temperature sensors are shipped with each boiler. Attach one to
the system supply piping and the other to the system return piping. For piping
larger than 5 inch diameter or nonmetallic piping, using immersion sensors
will provide faster response. See
section for available immersion sensors.
2. Locate the supply sensor at least six pipe diameters, but no further than 3 feet,
downstream from the boiler connection to the main to ensure adequate mixing.
3. Supply sensor – wire between P14 #1 and #2 (common).
4. Return sensor – wire between P14 #3 and #2 (common).
5. Thermostat wire can be used to connect these sensors.
6. The Control compares the system return temperature with the system sup-
ply temperature. Should the return temperature ever exceed the supply
temperature, the Control knows there is likely a sensor failure and will report
this problem on the display.
All heating systems shown in this manual require the System Sup-
ply and Return sensors to be installed for proper control function.
System will not properly provide heat if sensors are not installed
according to these instructions.
F. Outdoor temperature sensor –
Terminal Block P10 #1 & #2
1. The control provides programmable options if using an outdoor temperature
sensor. This sensor is supplied with the boiler.
2. Mount the outdoor sensor on an exterior wall, shielded from direct sunlight
or 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 the wiring
diagrams (see Figure 52, page 48). Thermostat wire can be used to con-
nect the sensor.
54
commercial condensing gas
SlimFit
boiler manual replacement parts
OPTIONAL
— Boiler Manual
-
fired water boiler
(continued)
REQUIRED
See Figure 52, page 48 for details
See Figure 52, page 48 for details
Strap to supply & return piping
Part number 550-100-561/0224