2
TAbLE Of CONTENTs
GAs-fIRED DIRECT vENT mODuLATING hOT wATER bOILER
INsTALLATION mANuAL
Printed in USA • Made In USA
Keep this manual near boiler
and retain for future reference.
ImPORTANT: This boiler is to be installed by a
qualified installer only.
I - Introduction
.....................................................2
II - Safety Symbols and Warnings
......................3
III - Rules For Safe Installation and Operation
...3
IV - Boiler Ratings and Capacities
......................4
v - before installing the boiler
..............................5
VI - Placing the Boiler
....................................... 11
VII - Near Boiler Piping
.....................................12
VIII - combustion air and vent pipe
...................14
IX - Gas Supply Piping
.....................................16
X - Electrical Wiring
..........................................18
XI - Controls and Accessories
..........................19
XII - Water Treatment & Freeze Protection
.....22
XIII - Putting the Boiler in Operation
.................25
XIV - Maintenance and Cleaning
......................27
XV - Boiler Wiring Diagram
...............................29
XVI - Piping and Wiring Appendix
.....................30
I - INTRODuCTION
This appliance is a gas-fired direct vent modulating cast
aluminum hot water boiler. A revolutionary cast aluminum
monoblock heat exchanger means better heat transfer
and thermal storage than similarly sized cast iron boilers,
which results in higher efficiency. The heating system wa-
ter absorbs large amounts of heat from the cast aluminum
heat exchanger, cooling the flue gases and causing con-
densation. Sealed combustion, premix gas burner, and
low flame temperature means drastically reduced CO and
NOx emissions, which contribute to a cleaner and health-
ier environment.
This appliance, unlike normal residential atmospheric
and induced draft units, takes its combustion air directly
from the outdoors (sealed combustion) and does not
compete with building occupants for fresh air. Sealed
combustion (also known as “direct vent”) is the safest
and best way to obtain plenty of clean combustion air.
The forced draft fan draws in the outside combustion air
to mix with gas, which flows into the pre-mix burner and
burns. The fan then forces the resulting flue gases from
the boiler unit and provides a positive removal of the flue
gases from the building through inexpensive and read-
ily available PVC and CPVC pipes. ULC S636 Material
must be used in Canada.
