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supply riser 6 – 12 inches above the boiler, as shown
in the following photo of the top of an SF170 boiler.
Low Water Cutoff
Pressure/Temperature Gauge
Manufacturer's Documentation
See Appendix D: Parts Listing – Low Water
Cuto<
Low Water Cutoff Testing
A;er installing the unit operate the system.
Carefully observe the operation of all components
through at least one complete cycle. Be sure to
include a check to the operating limit switch
operation (shuts down at 180). Make any corrections
needed then repeat the checkout. Repeat until
system operates properly.
Low Water Cutoff Troubleshooting
If the boiler does not shut down when the water
drops below the probe:
1. Remove power immediately and re-check
wiring.
2. Remove power and check for adequate
clearance from the probe to any surface within the
boiler or tee.
IF THE BOILER DOES NOT FIRE
(A) Make sure water is at probe and probe lead
wire is properly secured to the terminal.
(B) Check for proper ground between probe and
boiler shell. Excessive use of TeEon tape or sealing
compound may insulate the probe from the boiler
shell.
3. Re-check wiring and test for correct incoming
voltage. IF THE RED LED LAMP IS ON
lamp indicates that the control is locked-out.
feature will activate if the boiler experiences a low
water condition exceeding 30 seconds in duration.
IMPORTANT: Do not reset control until the cause of
the low water condition is corrected. CAUTION: Do
not add water until boiler is cool.
Low Water Cutoff Offline Testing
If you suspect that a temperature control device
is not working properly, the component can be
pulled from the system to be checked. Place the
capillary in a container of water that can be safely
heated to within the temperature range of the device
(150-180F). Use a thermometer that has a
temperature range well above the temperature you
will heat the water to. Make note of the temperature
that the device is set to. Heat the water up above the
devices set point and listen for an audible click from
the device le=ing you know that the contacts have
changed state. If the temperature at which the
device changes state is within 10º F of the reading
on the thermometer then device is working
properly. If the temperature at which the device
changes state and the reading on the thermometer is
more than 10º F di<erent then the device should be
replaced with a new one. It is not advisable to
service these devices.
Low Water Cutoff Maintenance
To ensure optimum performance, inspect probe
annually. Clean any scale or build-up from the probe
using a scouring pad or steel wool. Re-install the
probe and test .
THERMOSTAT CONNECTION
SF170/SF270 boilers do not require a connection
to a building thermostat for operational purposes.
e boiler water temperature is controlled by the
operate limit control.
BOILER DUMP ZONE APPLICATIONS
Unlike oil or gas 9red boilers, solid fuel boilers
will still produce some additional heat a;er the call
- 12 -
e red LED
is
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