37
CAPACITY CONTROLLERS – CAPL-2
and field conditions. For example, in milder climates setting may be as low
as 110 to 115 degrees. In more severe climates up to 150 degrees.) As long
as there is a heating call (WIN energized), the following will occur.
HEAT STAGING ON:
• If the
leaving air is 130 degrees or less
and heat one is off, heat
one will turn on within four minutes. If heat one is on, heat two will
turn on within ten minutes.
HEAT STAGING OFF
:
• If
the
leaving air is between 145 and 150 degrees
and heat two
is running, heat two will turn off. Heat one will turn off after 150
Degree setpoint is exceeded
•
If the
leaving air is 150 degrees or greater
then all heat stages
will turn off and the indoor blower fan is energized until heat one
turns back on or until the heat call is satisfied.
NO STAGING:
If the
leaving air is greater than 130 and less than
or equal to 145 degrees,
then no heat staging will occur.
HEATING CALL (Heat Pump)
(heat setpoint 118). As long as there
is a heating call (WIN energized), the following will occur:
HEAT STAGING ON:
• If the
leaving air is 98 degrees or less
and heat one is off, heat
one will turn on within four minutes. If heat one is on, heat two will
turn on within eight minutes.
HEAT STAGING OFF
:
• If
the
leaving air is between 113 and 118 degrees
and heat two
is on, heat two will shut off after running a minimum of four min-
utes. Heat one will turn off after it has been on a minimum of four min-
utes and heat two has been off a minimum of six minutes.
• If
the
leaving air is 118 degrees or greater
then all heat stages will
turn off after the last heat stage running has run for at least four min-
utes.
NO STAGING:
• If the
leaving air is greater than 98 and less than or equal to
113
degrees, then no heat staging will occur.
The CAPL-2 consists of the following:
A. Digital Display
– Three digit LED. Normally displays the leaving air
temperature of the HVAC unit. When the UP/DN buttons are pressed, the
cut-out setpoints are displayed. Refer to the Setpoint Calibration
section for reading and adjusting the setpoints.
B. Microcontroller
– Activates and controls outputs based upon leaving
air temperature comparison with programmed setpoint. Occasionally soft-
ware upgrades may become available. If so, the CAPL-2 software can be
field upgraded by changing this microcontroller.
C. Thermometer Calibrator
– Calibrates the leaving air temperature
thermometer. Turn clockwise to lower temperature. Turn counterclock-
wise to raise. Refer to CALIBRATION section for complete calibration infor-
mation.
D. Economizer Selection Jumper:
ECON – Place here if you have an economizer.
ECOFF – Place here if no economizer.
E. Leaving Air Sensor (LAS) Terminals
– Leaving air temperature
sensor is connected to the CAPL-2 here. Red to + and white to –. The
sensor monitors the leaving air of the HVAC system. If preferred, the
CAPL-2 can be mounted up to 500 feet from the sensor. See Installation
section for further information.
F. HVAC/System Controller Interface Terminals
– Y IN – Cool call
input, Economizer output; Y1 – Compressor 1; Y2 – Compressor 2;
G – Indoor blower fan; W IN – Heat call input; W1 – Heat 1; W2 – Heat
2. See Wiring section for detailed wiring instructions.
G. 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-2 uses less than 2 VA of power. See Wiring section
for detailed wiring instructions.
H. Status Lights
–
ECONO
– On during cool call. Indicates economiz-
er 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 Con-
troller or CAPL-2 (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.
I. Power Switch
– When off, the display is off, the CAPL-2 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-2 is operational.
J. Board Number
– This number indicates the circuit board number and
revision. May need to know this number if conferring with technical
support.
K. Heat Pump/Gas Electric selection jumper
– Place at GE position
for gas/electric units.
Place at HP position for
heat pump units that use
gas/electric thermostats.
L. Setpoint Adjust-
ment
– Use the UP/DN
buttons to view and
change the cutout set-
points. Refer to the Set-
points, Calibration sec-
tion (Page 41) for read-
ing and adjusting the set-
point
s.
F
G
Y IN Y1 Y2 GIN
R C
WIN W1 W2
W1 W2
Y1 Y2
F
A
N
E
C
O
N
O
UP
DN
ON
OFF
GOUT
HP
GE
ECON
ECOFF
B
D
I
J
K
L
H
A
C
E
+ -
990616B
R4
COMPONENTS
