Operating instructions

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 530 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.]
GT 530-15A 16 inc 12 inch GT 530-21A 16 inch 12 inch
GT 530-16A 16 inc 12 inch GT 530-22A 18 inch 14 inch
GT 530-17A 16 inc 12 inch GT 530-23A 18 inch 14 inch
GT 530-18A 16 in 12 inch GT 530-24A 18 inch 14 inch
GT 530-19A 16 inc 12 inch GT 530-25A 18 inch 14 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
GT 530-20A 16 inc 12 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
GT 330 A Series
Model
Boiler
Connection ø
Oil-Gas
Vent ø
[∆p] Pressure switch
Setting [inches w.c.]
GT 334 A 7 inch 5 inch
GT 335 A 7 inch 5 inch
GT 336 A 7 inch 5 inch
GT 337 A 8 inch 6 inch
GT 338 A 8 inch 6 inch
GT 339 A 8 inch 6 inch
Set vent safety
pressure switch
150% above burner
gas manifold or
head pressure
setting
GT 430 A Series
Model
Boiler
Connection
ø
Oil-Gas
Vent ø
[∆p] Pressure
switch Setting
[inches w.c.]
GT 430-8A 10 inch 8 inch
GT 430-9A 10 inch 8 inch
GT 430-10A 10 inch 8 inch
GT 430-11A 12 inch 10 inch
GT 430-12A 12 inch 10 inch
GT 430-13A 12 inch 10 inch
GT 440-14A 12 inch 10 inch
Set vent safety
pressure switch
150% above
burner gas
manifold or
head pressure
setting
13
85534150
11-20-09