Operation - Lennox KGA Series Service Literature

ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
24V POWER
ECONOMIZER
BLOWER(G)
HEAT 1(W1)
HEAT 2(W2)
COOL 1(Y1)
COOL 2(Y2)
24V COMMON
24V POWER
COOL 1 (Y1)
COOL 2 (Y2)
24V COMMON
CONNECTION SCHEME FOR KCA, KGA AND KHA
092 THROUGH 150 UNITS WITHOUT
ECONOMIZER ONLY
POWER:
1- Terminal strip TB1 energizes thermostat components with 24VAC.

OPERATION:

2- TB1 receives data from the electronic thermostat A2 (Y1, Y2, W1, W2, G, OCP). The 24VAC signal from TB1 ener­
gizes the appropriate components for heat or cool demand.
DESCRIPTION
KEY COMPONENT
SENSOR, ELECTRONIC THERMOSTAT
A2
SENSOR, CO2
A63
CLOCK, TIME
CMC3
JACK, UNIT ECONOMIZER
J3
RELAY, EXHAUST FAN
K65
PLUG, ECONOMIZER BYPASS
P3
SENSOR, MIXED AIR OR SUPPLY AIR
R1
SENSOR, REMOTE THERMOSTAT
RT2
TERMINAL STRIP, CLASS II VOLTAGE
TB1
REMOVEP3 WHEN ECONOMIZERIS USED, ONLY ON KCA,
KGA AND KHA 180 THROUGH 300 UNITS.
TOUCHSCREEN THERMOSTAT
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