Weil-McLain SVF 1500 Manual page 62

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
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 ni
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 120VAC.
The devices used must provide electrically isolated contacts,
*
because the P11 jumper circuit carries 24VAC.
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.
J. Closure switch (flow switch and/or CAD) – with shared end switch –
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
on individual boiler.
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 120VAC.
The devices used must provide electrically isolated contacts,
*
because the P11 jumper circuit carries 24VAC.
4. Recommended configuration of the
a. Assign as a
the end switch.
b. For the
Demand. This ensures the end switch will be activated any time any burner
is called on to fire. See other
page 78.
c. will provide 120VAC to the shared device. Use an isolation relay if
shared device requires another voltage or more than 2.2 amp if using 120VAC.
5. 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.
The devices used must provide electrically isolated contacts,
*
because the P11 jumper circuit carries 24VAC.
Shared devices could be a louvered wall or other shared device that end switch
verification is required.
62
(see Figure 51 - Figure 58)
TM
control for a CAD interlock:
function.
operating mode, select
TM
ni
control for a CAD interlock installed
function.
operating mode, select Damper Control.
TM
ni
control for a shared end switch device:
function on the boiler with
operating mode, select
options in Figure 70,
(continued)
OPTIONAL
Damper Control
.
See Figure 51, page 50 for details.
OPTIONAL
Part number 550-100-250/0819