6
Ratings
Notes:
1. As an Energy Star Partner, the manufacturer has determined
that Noble Combi Boilers meet the Energy Star guidelines
for energy efficiency.
2. The ratings are based on standard test procedures prescribed
by the United States Department of Energy.
3. Net AHRI ratings are based on net installed radiation of
sufficient quantity for the requirements of the building
and nothing need be added for normal piping and pickup.
Ratings are based on a piping and pickup allowance of 1.15.
4. Noble Combi Boilers require special gas venting. Use only
the vent materials and methods specified in the Noble
Combi Boiler Installation and Service Manual.
5. Standard Noble Combi Boilers are equipped to operate from
sea level to 4,500 feet
only
with no adjustments. The boiler
will de-rate by 4% for each 1,000 feet above sea level up to
4,500 feet.
6. High altitude Noble Combi Boilers are equipped to operate
from 3,000 to 9,600 feet
only
. The boiler will not de-rate up
to 5,000 feet and will de-rate 4.45% for each 1,000 feet above
5,000 feet. The operation given in this manual remains the
same as the standard boilers. A high altitude label (as shown
in FIG. A) is also affixed to the unit.
De-rate values are based on proper combustion calibration
and CO
2
’s adjusted to the recommended levels.
For installations above 9,600 feet, please consult the factory.
Maximum allowed working pressure is located on the rating plate.
NOTICE
Combi
AHRI Rating
Model Number
Note: Change “N”
to “L” for L.P. gas
models.
Input
MBH
(Note 5)
Heating
Capacity
MBH
(Note 2, 7)
Net
AHRI
Ratings
Water,
MBH
(Note 3, 7)
AFUE
%
(Note 1, 7)
Min
Max
NKC110(N,L)
11
110
102
89
95.0
NKC150(N,L)
15
150
139
121
95.0
NKC199(N,L)
20
199
185
161
95.0
7. Ratings have been confirmed by the Hydronics Institute,
Section of AHRI.
8. The manual reset high limit provided with the NKC is
listed to UL353.
Other Specifications
Boiler Water
Content Gallons
SH Water
Connections
DHW Water
Connections
Gas
Connections
Vent/Air
Size
(Note 4)
1.4
1"
3/4"
1/2"
3"
2.0
1"
3/4"
1/2"
3"
2.7
1"
3/4"
1/2"
3"
Figure A High Altitude Label Location
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 9,600 FT.
A
S
M
E
H
LOW LEAD CONTENT
Installation & Service Manual
F I R E T U B E C O M B I
™
