Install Water Piping - Weil-McLain SlimFit 2 Series Manual

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
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 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.
Multi-temperature systems
includes circuits that require lower temperature 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 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 func-
tion 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 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
commercial condensing gas
— If the heating system
— Boiler Manual
-
fired water boiler
Backflow preventer
1. Use backflow check valve in cold water supply as re-
quired 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,
following guidelines in the
Installing relief valve
DO NOT install a relief valve with a
pressure higher than 100 PSIG
the maximum allowable relief valve setting
for the SlimFit boiler. The boiler is shipped
with a 30 PSIG relief valve. See Replace-
ment 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. 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 pos-
sible 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 be-
tween 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 se-
vere personal injury, death or substantial
property damage.
WARNING
below.
. This is
:
Part number 550-100-561/0224