Condensate Disposal - Slant/Fin VSL II Quick Start Manual

4
Option 1 Closely Spaced Tees Design
In order to properly design a CST system there are three main rules:
The distance between the centerline of the two tees should not be
greater than four times the pipe diameter of the primary loop. Nor shall
it exceed 12 inches.
The return side of the system entering the first tee must have a mini-
mum straight length before the first tee of eight times the pipe diameter
of the primary loop. This minimum shall not be less than 8 inches.
The supply side of the system exiting the second tee must have a min-
imum straight length after the second tee of four times the pipe diameter
of the primary loop. This minimum shall not be less than 4 inches.
Option 2 Low Loss Header
The use of a third party prefabricated low loss header eliminates the
need to field assemble and design primary secondary piping. If using
a low loss header use the sizing information of the manufacturer to cor-
rectly match its size to the size of the boiler.
Drawing 1. LLH
Purging the boiler/primary loop
The boiler loop and boiler must be pruged of air before the
boiler is put into operation. The boiler can be purged of air
by running water through it in the same manner as a zone
is purged. When piping the boiler loop ensure there is way
to purge it with the necessary drain connections and shut-
off valves.
Slant/Fin VSL II Quick Start Guide

Condensate Disposal

The condensate from the boiler must be disposed of. Connect the con-
densate drain on the bottom of the boiler to a drain line, this line should
be sloped down and away from the boiler.
There must be an air gap between the drain line connected to the bot-
tom of the boiler and the drain connect to the buildings pumping.
A condensate pump may be required in some installations if the boiler
is lower than the drain.
A condensate neutralizer should be installed, but is not always required
check local code.
Use materials approved by the authority having jurisdiction. In absence
of such authority, PVC and CPVC pipe must comply with ASTM D1785,
F441 or D2665. Cement and primer must comply with ASTM D2564
or F493. For Canada, use CSA or ULC certified PVC or CPVC pipe,
fittings and cement. Never use copper, galvanized, or black iron pipe to
drain the condensate. See the installation and maintenance manual
for complete instructions.
Drawing 2. CST
Water pressure and water flow.
The VSL II boilers have a built-in water pressure sensor
and water flow meter. The minimum water pressure is
9 psi and the recommended water pressure is 15 psi
minimum. The boilers are supplied with 30 psi pressure
relief valves.
The minimum water flows are as follows:
VSL II-90 minimum water flow = 1.4 GPM
VSL II-150 minimum water flow = 2 GPM
VSL II-200 minimum water flow = 4 GPM
VSL II-250 minimum water flow = 4 GPM