Weil-McLain 2 Series Manual page 54

®
SlimFit Series 2
Field wiring
E.
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
SlimFit
faster response. See
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 supply
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 Supply 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 –
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 connect the sensor.
54
COMMERCIAL CONDENSING GAS
(see
boiler manual replacement parts section for available
OPTIONAL
- — Boiler Manual
FIRED WATER BOILER
(continued)
–
REQUIRED
Strap to supply & return piping
See Figure 52, page 48 for details
See Figure 52, page 48 for details
Part number 550-100-180/0917