Weil-McLain 2 Series Manual page 14

®
SlimFit Series 2
Install water piping
Use two wrenches when tightening water piping at boiler,
using one of the wrenches to prevent the boiler interior pip-
ing from turning. Failure to support the boiler piping con-
nections 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 modulating temperature 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.
Additional limit controls
1. Consult local requirements for other codes/standards to determine if
additional limit devices are needed.
cludes circuits that require lower temperature water (radiant
slab circuits, for example) as well as higher temperature cir-
cuits, 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 front 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 tapping on top of the boiler supply outlet pipe.
The boiler is shipped with a ¼" NPT pressure and tempera-
ture 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 mani-
fold, provide an additional tapping in the near boiler piping
BEFORE any isolation valve.
14
COMMERCIAL CONDENSING GAS
— If the heating system in-
- — Boiler Manual
FIRED WATER BOILER
Backflow preventer
1. Use backflow check valve in cold water supply as required
by local codes.
Install relief valve
1. Install relief valve (shipped loose with the boiler) in the
1¼-inch tapping on top of the boiler supply outlet pipe.
2. Connect discharge piping to safe disposal location, follow-
ing guidelines in the
Installing relief valve
the maximum allowable relief valve setting for
the SlimFit 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.
or state 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 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
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 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
operate, resulting in the possibility of severe
personal injury, death or substantial property
damage.
below.
. This is
:
Part number 550-100-180/0917