Gas Type Selection; Mounting The Boiler; Gas Piping; Water Piping - Slant/Fin VSL II Quick Start Manual

Slant/Fin VSL II Quick Start Guide

Gas Type Selection

The boiler comes from the factory setup for natural gas. The boiler
comes with a conversion kit that must be used if the boiler is to be
installed and fired with propane gas. Instructions for the conversion
of the boiler are located in the installation and maintenance manual.

Mounting the Boiler

The boiler bracket should be securely fixed to a wall that is suffi-
ciently strong enough to bear the weight of the boiler when filled
with water as well as the attached plumbing. The boiler should not
be used to support the plumbing system, all piping attached to the
boiler must be properly supported with appropriate support brack-
ets. Do not install the boiler on drywall unless anchoring directly to
the studs. Install the boiler bracket to the wall with the provided
mounting materials. Ensure that it is level before hanging the boiler.
Figure 2. Mounting boiler Illustration

Gas Piping

The boiler gas piping must be sized to accommodate the full load
of the boiler in addition to all the other gas appliances in the build-
ing. The boiler should be the first appliance connected to the gas
supply line. Never use a ½" corrugated appliance adapter for con-
necting the boiler. If using propane contact your propane supplier
to size gas piping, tanks, and 100% lockup gas pressure regulator.
Install a manual gas shutoff valve below the boiler following all local
and national code. This valve should be a full port gas ball valve.
Install a drip leg/sediment trap as well as a union to facilitate serv-
icing of the unit. See the installation and maintenance manual for
complete instructions. The nominal natural gas pressure is 7" W.C.
The nominal propane gas pressure is 11 W.C.
Gas
Inlet
Gas shutoff valve,
shown in open po-
sition
Figure 1. Service clearances

Water Piping

The heating system should be flushed before fitting the boiler to the
system, see the installation and maintenance manual for system
flushing instructions.
The boiler must be connected to the heating system utilizing pri-
mary secondary piping to hydraulically separate it from the system.
Piping can be accomplished in two ways either through the use of
a Low Loss Header (LLH) or through Closely Spaced Tees (CST).
When using a low loss header please refer to the header manufac-
turer for sizing and installation information. When using closely
spaced Tees they must be sized and pipe according to standard
design practices based on the btu output of the boiler and the flow
rate. Follow the two piping illustrations below for valve and pump
placement. The PRV must be installed directly below the boiler be-
fore any shutoff valves. Install unions as shown in the drawing as
well as ball valves for boiler isolation to allow for service and main-
tenance of the boiler. Important: Primary boiler loop piping must
be a minimum diameter for each model
VSL II-90: 1"
VSL II-150: 1" 1/4"
VSL II - 200: 1 1/4"
VSL II - 250: 1 1/2"
Primary Secondary Piping:
Primary secondary piping must be used at all times with this boiler.
Failure to properly size and install primary secondary piping may
cause damage to the boiler and void the warranty. There are two
standardized methods for primary secondary piping, the first is to
use Closely Spaced Tees here after referred to as CST. The second
method is to use a third party Low Loss Header also called a Hy-
draulic separator.
Appliance
C
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