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Power
The ZN510 controller is powered by 24
VAC. A total of two 1/4-inch quick-
connect terminals are provided for 24
VAC connection to the board. See
Figure 4 for ZN510 power requirement.
Note: Power for field installed ancil-
lary devices is not available from the
board. It must be tapped at trans-
former. See Table 21 for excess power
available.
Factory Supplied Transformer
24VAC
Line
Voltage
Figure 4: Power Connections
Binary Outputs
The ZN510 uses five of its binary
outputs to control heat pump units.
Outputs are load side switching triacs.
The triac acts as a switch by either
making or breaking the circuit
between the load (reversing valve,
damper, contactor, relay) and ground.
See Figure 5 for the configuration of
the five binary outputs.
2-Position Damper Actuator or
Generic Binary Output
Binary output 6 (BOP 6) is factory
configured to control a normally
closed 2-position outdoor air damper.
It may be field modified to control a
generic output for control by a
building automation system. If set up
as a generic output, the controller
does not use BOP 6 as part of the
normal control. A building automation
system must issue commands to
control the generic binary output.
Note:
z During occupied mode, the
outdoor air damper is closed
when the fan is controlled off.
z During unoccupied mode, the
outdoor air damper normally
remains closed.
z 2-position damper must not
exceed 10 VA power output from
board.
J1-1
Binary Outputs
Figure 5: Binary outputs
.
Table 1: BOP 6 control of a 2-position outdoor air damper
Model Fan Operation Outdoor Air Damper
Occupied
On or cycling
Off
Open
Closed
Occupied warm up or
cool down
On or cycling Closed
Occupied standby On or cycling Closed
Unoccupied Cycling Closed
Diagnostic present Diagnostic dependent Closed
BOP 1 (Fan)
BOP 2 (Reversing Valve)
BOP 3 (Not available)
BOP 5 (Compressor 1)
BOP 6 (Compressor 2)
BOP 7
J1-2
J1-3
J1-4
J1-5
J1-6
J1-7
24VAC
Unit Operation
1TB1-17
1TB1-18
Field installed
2 position
damper actuator
BOP 4 (Not Used)