6
Ratings
A
S
M
E
H
Notes:
1. As an Energy Star Partner, Lochinvar has determined that
Knight Wall Hung Fire Tube 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. Knight Wall Hung Fire Tube boilers require special gas
venting. Use only the vent materials and methods specified
in the Knight Wall Hung Fire Tube Installation and
Operation Manual.
5. Standard Knight Wall Hung Fire Tube boilers are equipped
to operate from sea level to 4,500 feet
only
. The boiler will
de-rate by 4% for each 1,000 feet above sea level up to 4,500
feet.
6. High altitude Knight Wall Hung Fire Tube boilers are
equipped to operate from 3,000 to 9,600 feet
only
. Th
e
boiler will not de-rate up to 5,000 feet and will de-rate 1.7%
for each 1000 feet above 5000 feet. Th
e operation given in
this manual remains the same as the standard boilers. A
high altitude label (as shown in FIG A.) is also affi
xed to the
unit.
De-rate values are based on proper combustion calibration
and CO
2
’s adjusted to the recommended levels.
7. Ratings have been confirmed by the Hydronics Section of
AHRI.
Maximum allowed working pressure is located on the rating plate.
NOTICE
Knight Wall Hung Fire Tube Boiler
AHRI Rating
Model Number
Note: Change “N” to
“L” for L.P. gas models.
Input
MBH
(Note 5)
Min Max
Heating
Capacity
MBH
(Note 2,7)
Net
AHRI
Ratings
Water,
MBH
(Note 3,7)
AFUE
%
(Note 1, 7)
WHN056
8.2
55
51
44
95
WHN086
8.5
85
79
69
95
WHN111
11
110
102
89
95
WHN156
15.5
155
144
125
95
WHN200
20
199
184
160
95
WHN286
28.5
285
264
229
95
WHN400*
80
399
379
330
94.4*
Other Specifications
Boiler
Water
Content
Gallons
Water
Connections
Gas
Connections
Air
Size
Vent
Size
(Note 4,8)
2.3
1"
1/2"
2"
2"
2.2
1"
1/2"
2"
2"
2.3
1"
1/2"
3"
3"
3.2
1"
1/2"
3"
3"
5.2
1-1/4"
1/2"
3"
3"
4.9
1-1/4"
1/2"
3"
3"
6.5
1-1/2"
3/4"
4"
4"
Figure A High Altitude Label Location
DIR #2000544525 00
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 9,600 FT.
8. Models WH056 - 086 can be alternatively vented using a
3" vent/air size. If a 2" vent/air size is used, the maximum
vent/air pipe lengths for the WH056 model is 80 feet and
50 feet for the WH086 model. The WH111 model can be
alternatively vented using a 2" vent/air size. If the 2" vent/
air size is used, the maximum vent/air pipe lengths are
limited to 40 equivalent feet each. The WH286 model can
be alternatively vented using a 4" vent/air size. If the 3"
vent/air size is used, the maximum vent/air pipe lengths
are limited to 50 equivalent feet each.
9. The manual reset high limit provided with the Knight Wall
Hung Fire Tube is listed to UL353.
Installation & Operation Manual
*Note:
WHN400 value is thermal efficiency.