Note: 6, 8 and 12 BZR's are generally shipped from stock. If not available from stock, this product is made to order and has an expected lead time of 3 - 5 weeks.
BZR-B is designed with an adjustable compensation spring to bias the regulator providing a smooth transition to excess air operation at low fire. Using a gas adjuster downstream of a negative biased regulator, high fire can be set to stoichiometric conditions. As the system is turned down, the spring bias will subtract from the combustion air pressure causing the burner to go lean. Adjusting the screw under the cap assembly permits biasing the fuel/air ratio from high fire to low fire at a fixed, controlled rate. As shipped, the regulator is set at zero bias.
FEATURES
Accuracy: Low - Flow: ± 0.1'' W.C. Full - Flow: ± 0.3'' W.C.
Turndown up to 20:1
Continuous operation to 150°F
All units factory tested and sealed
Maximum inlet pressure: 2.0 psig
Minimum pressure drop through regulator: 4'' W.C
Sensitivity - Responds to signal pressure differential as low as 0.04'' W.C.
Adjustable spring bias from: + 0.3/-5.0'' W.C.
CAPACITY TABLE
Model Number
Pipe Size
SCFH Gas Flow @ 4.0" W.C. Pressure Drop
Inlet
Outlet
MFD. 0.4
Sp. Gr.
NAT. 0.6
Sp. Gr.
AIR 1.0
Sp. Gr.
L.P. 1.5
Sp. Gr.
6 BZR B
3/4"
3/4"
790
650
500
410
8 BZR B
1"
1"
1,580
1,290
1,000
820
12 BZR B
1-1/2"
1-1/2"
3,160
2,580
2,000
1,640
16 BZR B
2"
2"
5,530
4,520
3,500
2,860
20 BZR B
2-1/2"
2-1/2"
7,900
6,450
5,000
4,100
24 BZR B
3"
3"
12,600
10,300
8,000
6,500
32 BZR B
4"
4"
22,100
18,100
14,000
11,400