Figure 130
2ATINGSANDENGINEERINGDATA
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.
WMB-155C boiler venting 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 56.
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.
4(%
OUTDOOR SENSOR
-534"%).34!,,%$5.,%33%8%-04%$"%,/7
)SOPTIONALFOR#OMBI"OILERS
IMPORTANT
In accordance with
3ECTIONOFTHE
%NERGY!CT
, 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.
4()3/6%22)$%-534./4"%53%$5.,%33!4,%!34/.%/&4(%
&/,,/7).'#/.$)4)/.3)3425%
s
An external energy management system is installed that reduces the boiler water tem-
perature as the heating load decreases.
s
This boiler is not used for any space heating.
s
This boiler is part of a modular or multiple boiler system having a total input of 300,000
BTU/hr or greater.
s
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)
$IRECT6ENT#ATEGORY/.,9
Vent/
Comb. Air
Connection
Diameter
"TUH
(Note 5)
"TUH
(Note 2)
!&5%
(Note 1)
"TUH
(Note 3)
.ATURALGAS
0ROPANE
)NCHES
(Note 4)
v
6ENTAIR
PIPING
v
6ENTAIR
PIPING
WMB-155C
3” PVC/PP/SS
DOE
(Note 7)
Part number 550-100-305/0916
99
AquaBalance
TM
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
— C
OMBI
Boiler Manual
36
Ratings
