Magic Aire HCA 04, Installation, Operation And Maintenance Manual

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035-000049-001 Page 11 HCA IOM 1.1 8-28-2017
NOTES:
1. This diagram represents the factory-installed
electrical option with constant CFM control us-
ing the pressure transducer mounted inside the
unit. Control loop logic is contained in the VFD
programming. VFD keypad is mounted on out-
side of unit.
2. Typical wiring is shown. For exact wiring, refer
to the wiring diagram provided with the unit.
3. Field wiring includes power wiring (upper left
hand corner) and low voltage control wiring
(terminal block TB1).
4. Units ordered for 208V-240V voltage selection
are factory wired for 240V. Field may rewire
motor and transformer primary tap for opera-
tion at 208V.
5. Selection of field provided and installed electri-
cal components is the responsibility of the in-
staller, including branch circuit protection and
wiring.
6. To start the fan, apply 2.0VDC to + (plus)
and—(minus) terminals. Fan speed is variable
from 2.0VDC (minimum speed) to 10.0VDC
(maximum speed).
INSTALLATION-ELECTRICAL (cont’d)
TYPICAL WIRING DIAGRAMS—
Control Option “E”
Variable Speed
0-10VDC Signal Fan Speed Control
7. The control power (R and C at terminal
block TB1) can be used to power a stand-
ard 24VAC thermostat , DX relay and up to
2ea control valves. NOTE: Factory trans-
former is 40VA, so use caution when con-
necting multiple loads to the 24VAC con-
trol circuit.
8. Optional condensate switch (CNS) factory
option interrupts 24VAC to thermostat (R)
and controls when water level rises to pre-
set sensor level in the drain pan.
9. Optional current switch (CRS) factory op-
tion makes upon current flow to the motor.
Utilize as a dry contact for control system
alarms as needed.