12.5 Ton Modulating Erv - Carrier EnergyX 48HC Supplemental Installation Instructions

12.5 Ton Modulating ERV

The modulating ERV is an intelligent ERV with variable
speed fan motors. The ERV can provide a variety of
volumes of outside air and offset it with different exhaust
speeds. CO sensors can also be tied into it for Demand
2
START
TEST
(RTU in test
mode)
COOL
(RTU in
Cool)
VENT
(RTU in Heat,
or Vent)
Notes:
1 Min CFM represents the minimum outside air CFM requirement based on CO
2 Occupied also means being in the unoccupied period but configured to run.
3 Requires factory-installed Frost Protection option.
ERV Mode = Test
User sets ERV to desired values for
testing purposes
OAU OA Fan Speed Test→
OAU PE Fan Speed Test→
OAU Wheel Test→
Is unit
occupied 2
and IDF on?
ERV Mode = OFF
Wheel = off
OA CFM = 0
Ex CFM = 0
Fig. 6 - - Modulating ERV Control & Operation Flow Chart
control ventilation (DCV) operation. The modulating ERV
will operate based on occupancy and the rooftop's
operating mode, the following sections explain operation
in detail. Refer to Fig. 6 for the overview flow diagram of
a modulating ERV operation.
ERV Mode = Defrost
Is there Wheel = On
frost on the
OA CFM = 0
wheel?
Ex CFM = Min CFM
ERV Mode = ERV or DCV Mode
Wheel = On
OA CFM = Min CFM
Ex CFM = OA CFM - Ex CFM offset
values and setpoints.
2
13
3
1 in effect
- Ex CFM offset
1
C13025