REVT-05ERV 17
maintained entering the ERC by cycling a 2-stage electric
heat unit located just after the fresh air hood. The heater
is controlled by a field adjustable temperature sensor
located at the inlet of the wheel. If the temperature falls
below the setpoint the first stage will turn on. If that does
not satisfy the load, the second stage turns on.
See Pre-
Heat wiring diagram for circuit logic.
H. CO
2
SENSOR
Helps control indoor air quality based on CO
2
levels in
the occupied space. High CO
2
levels can either trigger
a response from the ERV unit by turning on the blowers
to bring in fresh air or by modulating the blowers if a
VFD option has been selected.
See Basic Unit wiring
diagram for circuit information.
I. ROTATION SENSOR
The circuit indicates the absence of pulses, within a
specified time range, provided by a magnetic sensor
detecting a magnet mounted on wheel surface. After the
initial time delay of approximately 5 seconds from circuit
power up, if the sensor fails to provide a signal pulse
(no wheel rotation) within approximately 5 additional
seconds, the alarm relay will activate the latch (until circuit
powers down) providing a 5 amp contact closure output.
This would indicate no wheel rotation and/or magnet in
the system has stopped at the magnetic sensor pickup
point. If the pulse (wheel rotation) is detected within the
approximately 5 second time period, the alarm relay will
remain open. No field timing adjustment of any type will
be required.
J. SMOKE DETECTORS
Duct mounted smoke detectors can be installed in both
return and/or supply air streams. Signals from the smoke
detectors can be set to start-up or shut-down the ERV unit
if smoke is detected.
See Basic Unit wiring diagram for
circuit information.
K. LOW AMBIENT KIT
Limits HVAC system operation when outdoor temperature
is below 10°F.
L. SENSIBLE-ONLY ERC
An Energy Transfer Wheel without the latent energy
transfer capability of the standard Enthalpy Wheel is
available for dry-climate application (RH less than 30%).
This wheel does not have the Silica Gel coating applied.
M. MERV 11 and 13 AIR FILTERS
All units are shipped with MERV 8 supply and exhaust
air filters. MERV 11 or 13 filters are available as factory
TABLE 5 - EXHAUST AIR LEAVING TEMPERATURE AND
ENERGY RECOVERY WHEEL EFFECTIVENESS
EXHAUST AIR TEMPERATURE AND ERW EFFECTIVENESS
ERW EFF
70
o
F AND 20% RH
INDOORS
70
o
F AND 30% RH
INDOORS
70
o
F AND 40% RH
INDOORS
DESIGN
TEMP
EAT
DESIGN
TEMP
EAT
DESIGN
TEMP
EAT
%
F
o
F
o
F
o
F
o
F
o
F
o
0.80
-13
4.0
-3
12.0
4
17.3
0.70
-15
11.0
-4.5
18.0
3
23.1
0.60
-19
17.0
-8
24.0
1
28.6
0.50
-26
22.0
-13
28.5
-3
33.5
0.45
-31
25.0
-17
31.0
-5
36.2
0.40
-40
26.0
-24
32.5
-10
38.0
installed options. MERV 8 filters are 30-35% efficient.
MERV 11 provides 60-65% efficiency at roughly the
same resistance level. The MERV 13 filter achieves the
minimum efficiency requirements (80-85%) of LEED
Green Building design. All are 2 inch thick, V-pleat design,
supported with expanded metal with Minimum Efficiency
Reporting Value determined per ASHRAE 52.2.
N. ELECTRONIC TEMPERATURE CONTROL
SYSTEM
Works in conjunction with optional heating and cooling
coils to temper the supply air back to ambient conditions.
Tempering the air entering the occupied pace allows
Enervent to bring in 100% outside air without putting an
additional load on the rooftop unit. The ETCS can be
entreated with a building automation system.
O. FREE AIR APPLICATION
Operation of the Energy Recovery Wheel can be altered,
sometimes referred to as Start, Stop, Jog, to take
advantage of economizer operation, which amounts to
free cooling. This is accomplished by:
De-energizing The ERC - Accomplished with a signal
from a Primary Temperature Sensor mounted in the air
intake compartment. This sensor will de-energize the
energy wheel when the outdoor air temperature falls
below the set point; which is factory set at 65°F, but is
field adjustable. An Override temperature sensor is
also furnished in the outdoor air intake compartment to
deactivate the economizer mode. This Override sensor,
also field adjustable, is factory set at 50°F; i.e., something
less that the Primary sensor. The two sensors together
create a deadband where the ERC will not operate and
free cooling can enter the building unconditioned.
P. GFCI SERVICE OUTLET
A 120 VAC GFCI service outlet is shipped loose for field
installation. Requires separate power source so power
is available when unit main disconnect is turned off for
servicing.
Q. EME INTAKE LOUVERS
A fresh air hood consisting of a built-in, louvered, moisture
eliminator requiring no maintenance during the life of the
unit. This contrasts with the standard hood, which contains
an aluminum mesh filter(s) requiring routine maintenance.
The EME intake surface is parallel to front of the unit and
extends outward approximately four inches.
R. VFD BLOWER CONTROL
Variable Frequency Drives (VFD) control the blower
speed. One VFD is provided for each blower (supply and
return), as well as the ERC if Modulating frost Control
is selected.. The VFDs provided are Johnson Controls
DC* line of drives manufactured by Eaton. Refer to the
Drive’s manual included with the ERV for further technical
specifications and information.
Refer to the VFD operation manual Chapter 5 for
information on parameters. Most manufactures setpoints
are retained except for :
P1 - Max Frequency - set to 60Hz
P2 - Min Frequency - set to 21.5 Hz
P7 - Operating Voltage - off motor nameplate
P8 - Motor AMPS - off motor nameplate
Summary of Contents for ENERVENT+ EVT-09 Series
Page 30: ...30 REVT 05ERV UNIT WIRING DIAGRAM ...
Page 31: ...REVT 05ERV 31 UNIT WIRING DIAGRAM CONTINUED ...
Page 47: ...REVT 05ERV 47 UNIT WIRING DIAGRAM XVIII WIRING DIAGRAMS ...
Page 48: ...48 REVT 05ERV UNIT WIRING DIAGRAM CONTINUED ...
Page 50: ...50 REVT 05ERV Optional Heat Cool Inputs Optional Pre Post Heat ...
Page 57: ...REVT 05ERV 57 DIAGRAM 15 5 1 MODULATION GAS POST HEAT DIAGRAM 14 2 STAGE GAS POST HEAT ...
