Install Water Piping - Weil-McLain SVF Series 1 Manual

SVF ™
Series 1
COMMERCIAL CONDENSING GAS

Install water piping

Use two wrenches when tightening water piping at boiler,
using one of the wrenches to prevent the boiler interior
piping from turning. Failure to support the boiler piping
connections to prevent them from turning could cause
damage to boiler components.
General piping information
Additional controls, when required
The control module uses temperature sensors to provide
both high limit protection and operating limit control, and
is UL353 Limit Controls certified to meet ASME CSD-1
and Section IV requirements. The boiler is equipped with
a low water cut-off and the manual reset is performed
through the control module. Some codes/jurisdictions
may require additional external controls.
Operating limit set point = Supply Max. Temperature
+ Off differential
Additional limit controls
1. Consult local requirements for other codes/standards to determine
if additional limit devices are needed.
Multi-temperature systems
includes circuits that require lower temperature water (radi-
ant slab circuits, for example) as well as higher temperature
circuits, it is recommended to protect low-temperature
circuits with limit controls that are wired to a manual or
automatic reset circuit on the control.
2. See instructions beginning on page 47 for wiring information.
a. The control provides two (2) sets of limit control contacts — one
set will cause automatic reset and the other will cause manual
reset of the control.
b. The control can be reset using the manual RESET function on
the control display.
Low water cutoff
1. A push-to-test low water cutoff is factory-installed in the boiler. The
low water cutoff probe is mounted on the supply outlet pipe at the
back of the boiler heat exchanger.
2. The low water cutoff is manual reset through the main control. This
can be performed through the display by selecting MANUAL RESET.
Pressure/temperature gauge
1. Mount the pressure/temperature gauge (shipped loose with the
boiler) in the ¼-inch port on top of the boiler supply outlet pipe.
The boiler is shipped with a ¼" NPT pressure and tem-
perature gauge which has a pressure range up to 75 psig.
This gauge meets ASME requirements up to a relief valve
setting of 50 psig. For higher pressure rated relief valves,
a different pressure and temperature gauge with a higher
pressure range is required. When installing a gauge that
requires a larger tapping than the ¼" NPT tapping in the
boiler supply manifold, provide an additional tapping in
the near boiler piping BEFORE any isolation valve.
14
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FIRED WATER BOILER
Backflow preventer
1. Use backflow check valve in water fill as required by local
Install relief valve
1. Install relief valve (shipped loose with the boiler) in the
2. Connect discharge piping to safe disposal location, following
— If the heating system
— Boiler Manual
codes.
(SVF 750) ¾" or (SVF 1000/1100) 1¼-inch nipple on top
of the boiler supply outlet pipe.
guidelines in the WARNING below.
Installing relief valve
DO NOT install a relief valve with a
pressure higher than 160 PSIG
the maximum allowable relief valve setting for
TM
the SVF boiler. The boiler is shipped with a
30 PSIG relief valve. See Replacement parts in
the back of this manual for alternate pressure
setting relief valves.
To avoid water damage or scalding due
to relief valve operation, as per local or
state codes :
Discharge line must be connected to relief valve
outlet and run to a safe place of disposal. Ter-
minate the discharge line in a manner that will
prevent possibility of severe burns or property
damage should the valve discharge.
Discharge line must be as short as possible and
be the same size as the valve discharge connec-
tion throughout its entire length.
Discharge line must pitch downward from the
valve and terminate at least 6" above the floor
drain where any discharge will be clearly visible.
The discharge line shall terminate plain, not
threaded, with a material serviceable for tem-
peratures of 375 °F or greater.
Do not pipe the discharge to any place where
freezing could occur.
No shutoff valve shall be installed between the
relief valve and boiler, or in the discharge line.
Do not plug or place any obstruction in the
discharge line.
Test the operation of the valve after filling and
pressurizing system by lifting the lever. Make
sure the valve discharges freely. If the valve fails
to operate correctly, replace it with a new relief
valve.
Failure to comply with the above guidelines
could result in failure of the relief valve to oper-
ate, resulting in the possibility of severe personal
injury, death or substantial property damage.
Part number 550-100-200/1018
. This is