DeDietrich GT 300 A, Operating Instructions Manual

Page: 13 / 68

5.4 Boiler Venting – Side-wall or Direct Vent Systems Sizing Tables & Vent Safety Device
•
All venting lengths must be calculated to equivalent lengths,
all application must include at least one 90° elbow
•
Venting must be a type ‘BH” [AL294C® material]
•
Maximum vent length [equivalent] = 30 ft. [9m]
•
Minimum vent length [equivalent] 5 ft. [1.5m]
•
Maximum number of 90° elbows = 2 or 3 45° elbows, each
90° elbow is equivalent to 10 ft. or straight pipe, the 45°
elbow is equivalent = 5 ft.
•
Condensate TEE must be provided [equivalent length = 7 ft.]
•
Appliance reducing adapter [equivalent length 3 ft.]
•
Sealed combustion, combustion air intake sizing, must be
sized according to the burner manufacturers instructions
•
Vent [breeching] pressure shall not exceed 0.20 inches w.c.
[0.50 mbar]
•
Vent termination must be a TEE type, follow warning
regarding termination locations. Do not include the
termination TEE length in the vent length calculation.
•
Venting shall be sloped, so any condensation developed will
drain through the condensate TEE fitting
•
Vent safety device, differential air pressure switch [manual
reset] NC switch opens on rise of pressure.
•
Optional function of power burners which can employ an
post purge function to exhaust flue gases for a fixed time [1
minute to 4 minutes maximum]
•
Burner employing a standby air damper closed position, the
closed position should be slightly opened to allow hot flue
gases to escape upward through venting and not be
entrapped in the combustion head. Important note, that in
negative building pressures, the observation and odor of flue
gases may enter the boiler room.
Determining vent length [equivalent] Example:
Appliance reducing adapter [x1] = 3 ft.
Condensate TEE
[x1] = 7 ft.
12” vent straight vent pipe [x3] = 3 ft.
Elbow 90° [x1] = 10 ft.
Termination TEE [x1] = 0 ft.
Length [equivalent] = 23 ft.
GTE 500 A Series
Model
Boiler
Connection ø
Oil-Gas
Vent ø
[ ∆ p] Pressure
switch Setting
[inches w.c.]
Model
Boiler
Connection ø
Oil-Gas
Vent ø
[ ∆ p] Pressure
switch Setting
[inches w.c.]
GTE 515 A 16 inch 12 inch GTE 521 A 16 inch 12 inch
GTE 516 A 16 inch 12 inch GTE 522 A 18 inch 14 inch
GTE 517 A 16 inch 12 inch GTE 523 A 18 inch 14 inch
GTE 518 A 16 inch 12 inch GTE 524 A 18 inch 14 inch
GTE 519 A 16 inch 12 inch GTE 525 A 18 inch 14 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
GTE 520 A 16 inch 12 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
GT 300 A/II Series
Model
Boiler
Connection ø
Oil-Gas
Vent ø
[ ∆ p] Pressure switch
Setting [inches w.c.]
GT 304 A/II 7 inch 5 inch
GT 305 A/II 7 inch 5 inch
GT 306 A/II 7 inch 5 inch
GT 307 A/II 8 inch 6 inch
GT 308 A/II 8 inch 6 inch
GT 309 A/II 8 inch 6 inch
Set vent safety
pressure switch
150% above burner
gas manifold or
head pressure
setting
GT 400 A Series
Model
Boiler
Connection
ø
Oil-Gas
Vent ø
[ ∆ p] Pressure
switch Setting
[inches w.c.]
GT 408 A 10 inch 8 inch
GT 409 A 10 inch 8 inch
GT 410 A 10 inch 8 inch
GT 411 A 12 inch 10 inch
GT 412 A 12 inch 10 inch
GT 413 A 12 inch 10 inch
GT 414 A 12 inch 10 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
1
3