1-17
INSTALLATION
SL 30-175 MODULATING GAS BOILER
WATER PIPING
1.6.1 General Piping Issues
The SL 30-175 boiler was designed to be easy to install in almost any application.
Primary/secondary piping, or the use of a hydraulic separator is recommended
for maximum flexibility in multi-load applications, but piping loads in parallel
is also encouraged in systems that only have two loads, or when loads are
operating simultaneously. The extremely low pressure drop through the SL Series
heat exchanger allows many options not available in other designs. In short –
IBC has built a boiler that will allow you to pipe the system the way you prefer,
rather than try and dictate your piping practices from boiler to radiator.
There are some important details to consider however, and this section of the
Installation and Operating Manual will walk you through them so you can enjoy a
trouble-free installation.
The SL modulating series boilers are designed for use within a closed loop,
forced circulation, low pressure system. A 30 psi pressure relief valve (3/4” NPT)
is supplied for field installation at one of the locations shown in the following
illustrations. Relief valve discharge piping must terminate between 6” (15cm) and
12” (30cm) above the floor or per local Code.
Figure 19: Overview of piping options
1.6
Figure 20: Relief piping with single side piping connections
WARNING
During operation, the relief
valve may discharge large
amounts of steam and/or hot
water. Therefore, to reduce
the potential for bodily
injury and property damage,
a discharge line MUST be
installed that it:
1. is connected from the valve outlet
with no intervening valve and
directed downward to a safe point of
discharge.
2. allows complete drainage of both the
valve and the discharge line.
3. is independently supported and
securely anchored so as to avoid
applied stress on the valve.
4. is as short and straight as possible
5. terminates freely to atmosphere
where any discharge will be clearly
visible and is at no risk of freezing.
6. terminates with a plain end which is
not threaded.
7. is constructed of a material suitable
for exposure to temperatures of
375°F or greater.
8. is, over its entire length, of a pipe size
equal to or greater than that of the
valve outlet.
DO NOT CAP, PLUG OR OTHERWISE
OBSTRUCT THE DISCHARGE PIPE
OUTLET!
