39
5354 788 - 03
Vitorond 200, VD2A Series Installation
Additional Information
Technical Data
(continued)
*4
The maximum supply operating temperature (= max. adjustable high limit) lies approx. 27°F (15°C) below the
fixed high limit setting.
*5
May be less in some Canadian provinces.
*6
Connections for boiler connection kit (standard equipment).
*7
Combustion results are based on 13.0% CO
2
with fuel oil #2 and 10% CO
2
with natural gas, as well as a system
supply temperature of 167°F (75°C), and a system return temperature of 140°F (60°C). Measured flue gas
temperature with a combustion air temperature of 68°F (20°C) and a boiler water temperature of 176°F (80°C).
*8
Vent pipe collar diameter does not automatically indicate vent/chimney size. See page 30 for different venting
options (categories).
The combustion burner head material must be suitable for temperatures of at least 932°F (500°C).
For information regarding other Viessmann System Technology componentry, please reference documentation of
respective product.
Boiler Model
VD2A-
125
160
195
230
270
Max. boiler temperature
*4
(=fixed high limit)
°F (°C)
250 (121)
250 (121)
250 (121)
250 (121)
250 (121)
Max. allow. operating pressure
*5
psig
85
85
85
85
85
Boiler connections
*6
Boiler supply and return
in.
2½
2½
2½
2½
2½
Drain valve - sediment faucet
in.
¾
¾
¾
¾
¾
Heating surface area
Flue gas side
ft.
2
(m
2
)
53 (4.9)
70 (6.5)
85 (7.9)
102 (9.5)
117 (10.9)
Water side
ft.
2
(m
2
)
43 (4.0)
57 (5.3)
71 (6.6)
85 (7.9)
99 (9.2)
Flue gas
*5
– Temperature (gross)
*7
°F (°C)
365 (185)
365 (185)
365 (185)
365 (185)
365 (185)
– Flue gas mass flow rate
lbs/h (kg/h)
470 (213)
602 (273)
732 (332)
864 (390) 1014 (457)
With minimum heating input and a 2-stage burner (operation of stage 1)
– Temperature
°F (°C)
257 (125)
257 (125)
257 (125)
257 (125)
257 (125)
– Flue gas mass flow rate
at minimum input rate
lbs/h (kg/h)
282 (128)
362 (164)
439 (199)
516 (234)
604 (274)
Boiler standby loss based on max.
heating input and hot water supply
and return temperatures
of 167 / 140°F (75 / 60°C)
%
0.40
0.38
0.28
0.25
0.25
Vent pipe collar
outer
7
*8
in. (mm)
8 (200)
8 (200)
8 (200)
8 (200)
8 (200)
Flue gas resistance
“w.c.
0.26
0.38
0.40
0.48
0.64
Flue gas volume
of combustion chamber and flue
gas passageways
ft.
3
(m
3
)
4.909
(0.139)
6.039
(0.171)
7.169
(0.203)
8.299
(0.235)
9.429
(0.267)
Required flue draft
Category I
Pa (“w.c.)
0 (0)
0 (0)
0 (0)
0 (0)
0 (0)
Positive pressure
Category III
Pa (“w.c.)
20 (0.08)
20 (0.08)
20 (0.08)
20 (0.08)
20 (0.08)
