Appendic D - Energyx; Performance - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

APPENDIX D — ENERGYX
Many applications that utilize energy recovery incorporate
ducted return/exhaust air paths. In these applications it is im-
portant to consider the duct pressure of the return/exhaust just
as a designer would consider the effects of the supply duct stat-
ic pressure on the airflow of the rooftop unit itself.
The exhaust fan in the Modulated Volume EnergyX unit will
assist the rooftop unit fan in pulling air through the exhaust/re-
turn duct. These exhaust fans are backwards curved impeller
1400
1200
1000
800
600
400
200
0
0.00 0.20
Fig. B — 3 Ton SRT Unit ERV Supply and Exhaust Fan Performance Curves
®
EXHAUST FAN PERFORMANCE
0.40 0.60 0.80
External Static Pressure (in H
designs which are capable of significant more static pressure
operation than typical forward curved fan designs. The follow-
ing exhaust fan performance curves are provided for additional
guidance when considering return/exhaust duct design.
NOTE: If application designs require two separate ducts (one for
exhaust air, one for return air) contact your Carrier Sales Engineer
for additional guidance prior to specification or ordering.
1.00 1.20 1.40
0)
2
136
ECONOMIZER MODE
ERV MODE
1.60 1.80 2.00