User Guide

Part number 550-100-325/0718
131
AquaBalance
®
SERIES 2 WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
38 Ratings
Notes
1 As an Energy Star Partner, Weil-McLain
has determined that boilers meet the
Energy Star guidelines for energy ef-
ficiency.
NOTE: Adjusting boiler firing rate will
affect AFUE rating.
2 Based on standard test procedures
prescribed by the United States Depart-
ment of Energy.
NOTE that only Heating Capacity and
AFUE are certified by AHRI. AFUE is
also know as Annual Fuel Utilization
Efficiency or Seasonal Efficiency.
3 Net ratings are based on net installed
radiation of sufficient quantity for the
requirements of the building and noth-
ing need be added for normal piping
and pickup. Ratings are based on a pip-
ing and pickup allowance of 1.15. An
additional allowance should be made
for unusual piping and pickup loads.
4 Boilers must be direct-vented.
Boilers require special venting. Use
only the vent materials and methods
specified in this manual.
AB-80 or 120 vent/air pipes can be
either 2” or 3”. AB-155 is 3” only.
All vent and air pipe elbows must
be sweep elbows, NOT short-radius
elbows.
5 Ratings shown are for sea level applica-
tions only. For altitudes from sea level
to 4,500 feet above sea level, please refer
to page 66.
6 All of the boilers will automatically
de-rate as vent/air pipe length increases,
due to the pressure loss through the
piping. For vent/air pipe lengths less
than the maximum, the derate equals
the value above times vent length ÷ 100.
7 CSA - Low Lead Content only applies
to the Combi boiler models.
THE OUTDOOR SENSOR (SUPPLIED WITH HEATING ONLY BOILERS)
THE BOILER MUST BE INSTALLED UNLESS EXEMPTED BELOW:
(Is optional for Combi Boilers)
IMPORTANT
In accordance with Section 303 of the
2007 Energy Act
, this boiler is equipped
with a feature that saves energy by re-
ducing the boiler water temperature as
the heating load decreases. This feature
is equipped with an override which is
provided primarily to permit the use of
an external energy management system
that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE
FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces the boiler water tem-
perature as the heating load decreases.
• This boiler is not used for any space heating.
• This boiler is part of a modular or multiple boiler system having a total input of 300,000
BTU/hr or greater.
• This boiler is equipped with a tankless coil (not applicable to Combi).
AHRI Certified Ratings
Boiler
Model
Input
Heating
Capacity
Seasonal
Efficiency
Net
Water
Rating
% Input derate vs vent length
(Values shown are at MAX vent/air pipe length —
See Note 6)
Direct Vent Category ONLY
Vent/
Comb. Air
Connection
Diameter
MBH
(Note 5)
MBH
(Note 2)
AFUE, %
(Note 1)
MBH
(Note 3)
Natural gas Propane
Inches
(Note 4)
2”
Vent/air
piping
3”
Vent/air
piping
2”
Vent/air
piping
3”
Vent/air
piping
AB-80
80.0 75 95.0 65 12 % 4.2 % 12 % 4.2 %
3" PVC/PP/SS
AB-120
120.0 112 95.0 97 11.4 % 3.5 % 11.4 % 3.5 %
3” PVC/PP/SS
AB-155
155.0 144 95.0 125 ---- 5.0 % ---- 5.0 %
3” PVC/PP/SS
Figure 174 Ratings and engineering data
See (Note 7)