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svf
series
725/850
Install Water Piping
General Piping Information
NOTICE
Use two wrenches when tightening water piping
at the boiler with one at the boiler interior piping to
prevent it from turning. Failure to prevent boiler piping
connections from turning could cause damage to
boiler components.
Additional controls, when required:
The control module uses temperature sensors to
provide both high limits protection and operating limit
control. The module is UL353 Limit Controls certified
to meet ASME CSD-1 and Section IV requirements
A manual reset of the equipped low water cut-off
(LWCO) is performed through the control module
Some codes and jurisdictions may require additional
external controls
Operating limit set point =
Supply Max. Temperature + Off Differential
Additional limit controls:
• Consult local requirements for other codes and
standards to determine if additional limit devices
are needed
• The control provides two sets of limit control
contacts One set will cause automatic reset, while
the other will cause manual reset of the control
See the Field Wiring section starting on page 61
for wiring information
• The control can be reset using the manual RESET
function on the control display
NOTICE
If the heating system includes circuits that require
lower temperature water along with circuits that
require higher temperature water, it is recommended
to protect low-temperature circuits with limit controls
that are wired to a manual or automatic reset circuit
on the control.
550-100-290/0124
boiler manual
1
Low water cutoff:
A push-to-test low water cutoff is factory installed on
the switch panel on the left side of the control tray
The low water cutoff probe is mounted on the front of
the heat exchanger
The low water cutoff is manually reset through
the main control This can be performed through the
display by selecting RESET LOCKOUT
Backflow preventer:
Use a backflow check valve in the water fill as
required by local codes
Pressure and Temperature Gauge
The boiler is shipped with a 1/4" NPT pressure and
temperature (P/T) gauge The gauge has a pressure
range up to 75 psig This gauge meets ASME
requirements for a relief valve setting of up to 50 psig
The P/T gauge is mounted in a horizontal tee on
the boiler supply outlet pipe Installer must supply
a tee connected to the system supply that has the
correct sizing for the necessary P/T gauge See
Figure 7, page 17 for placement details
insTallaTion
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