EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]
A single 24vac, 40va transformer can
power up to three (3) 24vac dampers.
More dampers can be controlled by
using isolation relays and additional
transformers.
24VAC Power
Wiring
.
24vac Damper Power Wiring.
Line
Voltage.
provide
over-current
protection
TRANSFORMER
24V, 40VA
HK2000
DAMPER
Terminal
Block
CM - COMMON
RM - HOT
CM
RM
Spring Return
Motor Wiring
.
Spring Return Motor Wiring
A Spring Open Damper is wired to M1 & M6.
A Spring Close Damper is wired to M1 & M4.
O
u
ts
id
e
A
ir
M1
M2
M4
M6
{
MA-ESR
NC NO C M M
Motor Actuator
Damper Wiring
MA-ND/URD Damper Wiring
Common 24vac
Constant hot 24vac
24vac to open damper.
24vac to close damper.
Terminal M1
Terminal M2
Terminal M4
Terminal M6
DAMPER TERMINAL
DESIGNATION & FUNCTION
DAMPER MODE DEFINITIONS
RETURN
Air Mode
= Return Air Damper - OPEN
DEFAULT
Outside Air Damper - CLOSED
Exhaust Air Damper - CLOSED
OUTSIDE
Air Mode
= Return Air Damper - CLOSED
Outside Air Damper - OPEN
Exhaust Air Damper - OPEN
FRESH
Air Mode
= Return Air Damper - CLOSED
Outside Air Damper - OPEN
Exhaust Air Damper - OPEN
MECHANICAL
ASSISTANCE
Mode
= Return Air Damper - CLOSED
Outside Air Damper - OPEN
Exhaust Air Damper - OPEN
Warning:
Your application may limit the dampers
you can or want to control.
Do not
install a return
air damper or completely close off a return air
damper, when the outside air duct/damper is
undersized or completely closed off.
DEFINITIONS
RAD = Return Air Damper
OAD = Outside Air Damper
EAD = Exhaust Air Damper
OAS = Outside Air Sensor
RAS = Return Air Sensor
EC = Enthalpy Control
ED = External Device
M1
M2
M4
M6
E
x
h
a
u
s
t
A
ir
4
6
1
SPDT
End Switch
Dry Contacts
24vac only
Use dampers with Minimum/Maximum adjustments to obtain proper mixing of
the outside and return air sources.
M1
M2
M4
M6
R
e
tu
r
n
A
ir
2
4
1
Patented Optical
Damper Motor Actuators
SMDL/BMDL Damper Wiring
Patented Optical
Damper Motor Actuators
6
