Weil-McLain SVF 1500 Manual page 14

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
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 pro-
vide 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. Tempera-
ture + Off differential
Additional limit controls
1. Consult local requirements for other codes/standards to deter-
mine if additional limit devices are needed.
system includes circuits that require lower tempera-
ture water (radiant 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 49 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
Mount the pressure/temperature gauge (shipped loose with the
boiler) in the ¼-inch port on the side of the boiler supply outlet pipe,
one on each side is supplied.
The boiler is shipped with a ¼" NPT pressure and
temperature 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 install-
ing 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.
Backflow preventer
Use backflow check valve in water fill as required by local codes.
14
Install relief valve
1. Install relief valve (shipped loose with the boiler) in the
(SVF 1500/2000) 1¼ inch or (SVF 2500/3000) 2-inch cou-
pling on top of the boiler supply outlet pipe.
2. Connect discharge piping to safe disposal location, following
guidelines in the
— If the heating
below.
Installing relief valve
. This is the maximum al-
lowable relief valve setting for the SVF
boiler is shipped with a 30 PSIG relief valve. See
Replacement parts in the back of this manual for
alternate pressure setting relief valves.
codes
:
Discharge line must be connected to relief valve
outlet and run to a safe place of disposal. Terminate
the discharge line in a manner that will prevent pos-
sibility 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 connection
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 temperatures 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 pres-
surizing 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 operate, resulting
in the possibility of severe personal injury, death or
substantial property damage.
Part number 550-100-250/0819
TM
boiler. The