39Hxez / Verification Of Pressures - Carrier 39HXC Installation, Operation And Maintenance Instructions

5 - INSTALLATION AND INSTALLATION CONNECTIONS
Assembly with depression :
Z: X+Y+tubing diameter + insulation thickness
Y: Y = 0.5 * X
X: X = 25 mm for each 250 Pa of negative static pressure + 25 mm
X = 12 mm
Y = 12 mm + total static pressure (1 mm for 10 Pa)
NOTE: The condensate pan on the heat recovery unit is pressurised on the 39HXV model, and is also pressurised if there is a cooling
or mixed coil in the additional box.

5.3 - 39HXEZ / Verification of pressures

Verification of the pressures for EATR limitation:
- The limitation of the EATR value depends on the size of the installation and, specifically, the pressure drop on the exhaust air duct
- The presence of a manual control damper may however prove necessary to balance these pressures correctly (damper not
supplied by CIAT): contact the installation's design engineer
- This verification is used to adjust the installation so that any inclusion of exhaust air in the fresh air during recirculation is avoided
- The 39HXEZ is equipped with pressure connections P11 and P22 for diagnostics as follows:
30
Negative pressure recovery
pan
mmWC
Assembly with pressure:
ETA
11
22
SUP
Pressure connection
P22
P11
Slight slope of
0.005
To sewer
system
X
Y
Exhaust air
Fresh air