7
Low voltage connections
Contained within the control enclosure is the low voltage transformer. This is 240Vac primary
with 24Vac secondary, 40VA class 2 transformer. It provides power to the furnace controller,
thermostat, A/C or heat pump compressor relay and 24Vac external devices. Always ensure that
the load imposed by external devices does not exceed 40 VA (1A).
Figure 2
Low Voltage Control Connections
Terminal
Description
Purpose
G
FAN RELAY
THERMOSTAT INPUT
W
THERMOSTAT INPUT
STAGE 1 HEATING
W2
THERMOSTAT INPUT
STAGE 2 HEATING
R
24Vac OUTPUT TO THERMOSTAT
ONLY
GENERAL POWERING OF THE
THERMOSTAT
Y/Y1
THERMOSTAT INPUT
STAGE 1 COOLING
Y2
THERMOSTAT INPUT
STAGE 2 COOLING
C
24Vac COMMON
OUTPUT TO THERMOSTAT
5.0
PANEL DISPLAY, SWITCHES AND CIRCUIT BREAKER
Located in the upper front right-hand side of the furnace is the control panel indicating LED light.
LED Indications
A multi-color LED is located directly above the thermostat connections terminal strip. A solid
Green LED indicates that the furnace is in standby mode.
A slow flashing (once per second)
Green LED indicates that the furnace is either in a heating or a cooling cycle. A quick flashing (5
times per second) Green LED indicates that the unit is in the cool down cycle. A solid Amber
LED indicates that the furnace is in Quiet Comfort mode.
A solid Red LED indicates that a
qualified service technician should inspect the appliance.
Operation options DIP switches 1, 2, 3 and 4 (refer to wiring diagram on page 13)
Should the LED light located at the top of the thermostat terminal strip display RED, this is an
indication that the switch positions on the options DIP switches on the controller have either
been changed of position or that the control board itself has failed.
Confirm correct DIP switches position setting:
DIP 1 - OFF, DIP 2 - OFF, DIP 3 - OFF, DIP 4 - OFF
If the switch positions are correct and fully seated and the LED remains constant Red, replace
controller.
Summary of Contents for KHE-00-G010-03
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