39
C. Thermometer Calibrator
– Calibrates the leaving air temperature
thermometer. Turn clockwise to lower temperature. Turn counter-
clockwise to raise. Refer to CALIBRATION section for complete calibra-
tion information.
D. Leaving Air Sensor (LAS) Terminals
– Leaving air temperature
sensor is connected to the CAPL-4 here. Red to + and white to –. The
sensor monitors the leaving air of the HVAC system. If preferred, the CAPL-
4 can be mounted up to 500 feet from the sensor. See INSTALLATION
section for further information.
E. HVAC/System Controller Interface Terminals
– Y IN – Cool call
input, Economizer output; Y1 – Compressor 1; Y2 – Compressor 2; Y3
– Compressor 3; Y4 – Compressor 4; G – Indoor blower fan; W IN – Heat
call input; W1 – Heat 1; W2 – Heat 2; W3 – Heat 3; W4 – Heat 4. See
WIRING section for detailed wiring instructions.
F. HVAC power terminals
– Connect to HVAC system 24V AC power
source. R is 24 V hot. C is 24 V rtn. Cannot be connected to any other
power source. CAPL-4 uses less than 2 VA of power. See WIRING section
for detailed wiring instructions.
G. Status Lights
– ECONO – On during cool call. Indicates economizer
enabled; Y1 – On when first stage compressor energized; Y2 – On when
second stage compressor energized; Y3 – On when third stage
compressor energized; Y4 – On when fourth stage compressor energized;
FAN – On when indoor blower fan energized by System Controller or
CAPL-4 (G energized); W1 – On when first stage furnace energized;
W2 – On when second stage furnace energized; W3 – On when third stage
furnace energized; W4 – On when fourth stage furnace energized.
H. Power Switch
– When off, the display is off, the CAPL-4 is disabled
and the relay contacts are closed. The HVAC unit can run at this time but
will not have staging control or capacity control protection. When the
switch is on, the display is on and the CAPL-4 is operational.
I. Board Number
– This number indicates the circuit board number and
revision. May need to know this number if conferring with technical support.
J. Setpoint Adjustment
– Use the UP/DN buttons to view and change
the cut-out setpoints. Refer to the Setpoint, Calibration section (Page 41)
for reading and adjusting the setpoints.
CAPACITY CONTROLLERS - CAPL-4
WIRING – CAPL-4
Y1 IN Y1 Y2 Y3 Y4 G
W1 IN W1 W2W3 W4
R C
24V PWR
24V RTN
HEAT 1
HEAT 2
HEAT 3
HEAT 4
ECONOMIZER
COMP 1
COMP 2
COMP 3
COMP 4
FAN
Y
G
W
R
LAS
SENSOR
+
-
CAPL-4
HVAC UNIT
+ –
101ASSB System Controller
