Weil-McLain 2 Series Manual page 56

®
SlimFit Series 2
Field wiring
I. Closure switch (flow switch and/or CAD) –
1. A flow switch or combustion air damper (CAD) interlock can be configured by
removing jumper.
2. No control settings are required when using a flow switch.
3. Recommended configuration of the SlimFit control for a CAD interlock:
a. Assign as a
b. For the
. This ensures the damper will be activated any time the boiler is called
on to fire.
c. will provide 120VAC to the damper motor. Use an isolation relay if
damper motor requires another voltage or more than 2.2 amp if using 120 VAC.
The devices used must provide electrically isolated contacts, because
*
the P7 jumper circuit carries 5 VDC.
4. When a call for heat occurs, the corresponding output(s) energize, and the blower
does not activate until the closure switch is made. The boiler is given four (4)
minutes to make the closure switch. If the switch opens prior to ignition, the timer
continues with the blower remaining active. After four (4) minutes, if the closure
switch is not made, or if the closure switch opens during burner firing, the control
locks out. The fault will clear when the closure switch makes. The corresponding
output(s) will remain energized in an attempt to close the switch.
56
COMMERCIAL CONDENSING GAS
(see
function.
operating mode, select
- — Boiler Manual
FIRED WATER BOILER
(continued)
OPTIONAL
-
See Figure 52, page 48 for details
Part number 550-100-180/0917