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ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
Lennox Commercial
ACCESSORIES
REV. 2.0
REMOVEP3 WHEN ECONOMIZERIS USED, ONLY ON KCA,
KGA AND KHA 180 THROUGH 300 UNITS.
HEAT 2(W2)
ECONOMIZER
24V POWER
BLOWER(G)
HEAT 1(W1)
COOL 1(Y1)
24V COMMON
COOL 2(Y2)
TOUCHSCREEN THERMOSTAT
DESCRIPTION
KEY COMPONENT
A2
SENSOR, ELECTRONIC THERMOSTAT
A63
SENSOR, CO2
CMC3
CLOCK, TIME
J3
JACK, UNIT ECONOMIZER
K65
RELAY, EXHAUST FAN
P3
PLUG, ECONOMIZER BYPASS
R1
SENSOR, MIXED AIR OR SUPPLY AIR
RT2
SENSOR, REMOTE THERMOSTAT
TB1
TERMINAL STRIP, CLASS II VOLTAGE
k65
A
B
24V POWER
COOL 1 (Y1)
24V COMMON
COOL 2 (Y2)
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.
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