Lochinvar Power-Fin Designer's Manual page 10

Designer's Guide / Power-fin Water Heater
Pressure –The Power-fin 1501-2001-B9 models are factory trimmed with a large diameter vent
connection. The blower CANNOT PUSH the flue products through a similarly sized stack
therefore creating a non-positive pressure. Non-Positive Pressure.
B9 models are Category I.
M9 models / Power-fin 0502-2001
"M9" means "Modulating" Fire or 20% to 100% firing rate. (5:1 Turndown)
Temperature – When the Power-fin 0502-2001-M9 models modulate down to their lowest input
rate of 20%, they produce a comparatively low stack temperature that will likely cause
condensation to occur in the stack. Condensing.
Pressure – The Power-fin 0502-2001-M9 models are factory trimmed with a small diameter vent
connection. The blower CAN PUSH the flue products through a similarly sized stack therefore
creating a positive pressure. Positive Pressure.
M9 models are Category IV.
Part 3
Choose your vent configuration
Now, that you know your vent category and the matching Firing Code, it's time to choose the vent
configuration or system layout. Let's start with Category IV venting.
Category IV Venting
This is likely to be the most common because it offers modulation and it offers the largest variety
of vent configurations. All six layouts listed on page eight can be installed as Category IV
venting. The following pages offer a diagram of the six layouts, important design information and
a list of the available vent kits that are required to install some of these configurations.
Vertical Vent with Air from the Equipment Room
Vertical Vent with Air from the Rooftop
Vertical Vent with Air from the Sidewall
Sidewall Vent with Air from the Equipment Room
Sidewall Vent with Air from the Rooftop
Sidewall Vent with Air from the Sidewall
CATEGORY I
Non-Condensing
Non-Positive Pressure
F9 or B9 Models
CATEGORY II
CATEGORY III
CATEGORY IV
Condensing
Positive Pressure
M9 Models
Category IV
Category IV
Category IV
Category IV only
Category IV only
Category IV only
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LOCHINVAR CORPORATION
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com