17
ENG
“heaterSteam” +0300080EN - rel. 1.0 - 27.04.2016
All the UR models
NO
Fig. 3.g
SI
R>300mm (12”)
D> 200mm (8”)
R>300mm (12”)
NO
NO
D> 200mm (8”)
Fig. 3.h
3.6 Outlet pressure limits
The backpressure at the boiler outlet, either positive or negative, depends
both on the relative pressure in the duct/AHU and the pressure drop in
the steam pipe, due to bends or adapters, and the steam distributor.
Carel steam transport pipes have a pressure drop of around 150 Pa/m
(0.021psi) (respecting the maximum fl ow-rate recommended by Carel).
Carel DP* series linear distributors have a pressure drop of around 25 Pa
(0.003psi) (respecting the maximum fl ow-rate recommended by Carel).
Considering these values, the boiler outlet pressure must be:
boiler outlet pressure > 150 [Pa/m] * steam pipe length [metres] + 25 [Pa]
DP + pressure in duct/AHU [Pa]
Boiler outlet pressure values for heaterSteam:
UR002…R013 UR020…UR080
pressure limits at boiler outlet
Pa (PSI)
0 to 1500 (0 to
0.218)
0 to 2000 (0 to
0.290)
Note: a pressure of around -200 Pa (-0.029 psi) at the boiler outlet
corresponds to around 20 mm (0.78”) of water inside the boiler (for all
sizes).
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