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SlimFit
Series 2
®
Field wiring
(see Figure 52 & Figure 53)
I. Closure switch (flow switch and/or CAD) –
Jumper on Terminal Strip P11
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
INPUT 3
as a
b. For the
AUX PUMP/OUTPUT
. This ensures the damper will be activated any time the
DEMAND
boiler is called on to fire.
c.
will provide 120VAC to the damper motor. Use an isola-
OUTPUT 3
tion 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 proof of closure switch is closed and con-
ducting electricity. The boiler is given four (4) minutes to close the proof of
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 remains
open, or if the closure switch opens during burner firing, the control locks out.
The fault will clear when the closure switch returns to a closed state. The cor-
responding output(s) will remain energized in an attempt to close the switch.
56
commercial condensing gas
AUX PUMP/ OUTPUT
function.
operating mode, select
— Boiler Manual
-
fired water boiler
(continued)
OPTIONAL
ANY BURNER
See Figure 52, page 48 for details
Part number 550-100-561/0224
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