DENSO CORPORATION CLASSIC PLUS 26 - Manual (Page 24)

ELECTRICAL SYSTEM
16
2. Control Box
A. Capacitors
The capacitors are used to temporarily boost
the power output available to the fan motor
and the compressor at start-up.
The specifications of each capacitor are listed
below:
CAPACITOR VOLTAGE CAPACITANCE
APPLICATION RATING (
µ
f)
Fan Motor 440 12.5
Compressor 370 40
B. Relay Board
The Relay Board receives signals and outputs
from the control board that contains a micro-
processor. The relay board contains the
compressor, fan on and fan mode (speed)
relays. It also contains a step-down trans-
former that converts the line voltage (208/230
VAC) to 12 volts. This is then converted from
AC to DC and used for relay coil activation.
The 12V (DC) power is sent to the Control
Panel Assembly where it is further reduced to
5 volts for the system logic.
The relay board also contains the DIP-Switch.
The DIP-Switch is used to change the Fan
Mode operation from Stop to Operate and
change the Set Point temperature display
from ˚F to ˚C.
NOTE: The r elay boar d must be ser viced as a com-
plete assembly . It has only one ser viceable compo-
nent, the fuse.
(a) Relay Board Fuse
NOTE: The r elay boar d fuse is the only ser viceable
component on the r elay boar d assembly .
This fuse provides protection against damage
to the step-down transformer. It must be
replaced with the exact type of fuse or an
equivalent.
Fuse Specifications: 2/10A 250V
ƽCAUTION: Failure to use the exact type of fuse
could result in damage to the unit and/or to com-
ponents. It will
also void the warranty of the unit.
Compressor
Capacitor
Fan Motor
Capacitor
Terminal Block
Relay Board
Relay Board Fuse DIP Switch
S1
CF
ST
OP
OPERA
TE
J9
Temperature Scale Display Switch
˚ C ˚ F
DIP Switch
Fan Mode Control Switch
STOP OPERATE
Relay Board Fuse
Relay Board
Control Box
DIP Switch