CAPACITY CONTROLLERS - SYCAP
H. Heat Pump Power Terminals –
Connect to heat pump 24V AC
power source. R is 24 V hot. C is 24 V rtn. Cannot be connected to
any other power source. SYCAP uses less than 2 VA of power. See
WIRING section for detailed wiring instructions.
I. Power Switch –
When off, the display is off, the SYCAP is disabled
and K1 relay contacts are made. The heat pump compressor can run
at this time but will not have capacity control protection. The
auxiliary heat cannot run. When the switch is on, the display is on
and the SYCAP is operational.
J. Setpoint Adjustment –
Use the UP/DN buttons to view and
change the cut-out setpoints. Refer to the Setpoints, Calibration
section (Page 41) for reading and adjusting the setpoints.
K. Board Number –
This number indicates the circuit board num-
ber and revision. You may need to know this number if con-
ferring with technical support.
UP
DN
R
C
+
-
DL1
K1
A
K
J
B
D
I
H
G
F
DL2
C
Y1 Y1
W2
W2
K2
E
90107C
ON
OFF
The SYCAP is installed as detailed in the Capacity Controllers Installation
section, page 40. Wire as diagrammed below. The W2 terminal from the
SYHPA Switching Center must be wired to the SYCAP Capacity Controller
even if the Heat Pump does not have auxiliary heat. The SYCAP determines
the mode of operation based on this signal.
Terminals R and C of the SYCAP must be wired to terminals R (24V hot)
and C (24V rtn) of the Heat Pump system transformer.
Switching Center (SYHPA)
H
E
A
T
P
U
M
P
SYCAP
K1
K2
Y1
Y1
W2
W2
C
R
R
G
W2
Y
O/B
E
L
C
R
G
W2
Y
O/B
E
L
C
WIRING
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