23
Manual Output Testing the Heat
Pump Configurations
The procedure for testing heat pump
configurations is:
1.
Press and hold the Test button
for at least three seconds to
start the test mode.
2.
The test sequence resets
diagnostics and turns off all
outputs.
3.
Press the Test button several
more times (no more than once
per second) to advance through
the test sequence.
Testing the Heat Pump
Configurations
The outputs are not subject to
minimum times during the test
sequence. However, the test
sequence only permits one step per
second which limits output time.
All outputs are exercised regardless
what timer they are or are not
configured for. For example, single
compressor heat pumps function
the same as two compressor units.
For single compressor units, the
cool 2 and heat 2 steps control the
appropriate binary outputs, but do
not affect unit operation.
Reversing valve and damper
outputs cycle independent of
configuration.
Pump Operation for
Systems with ZN510
Loop Controller
During Unoccupied, the pumps will
be
OFF
but should be energized to
test compressor operation. The user
must override the pumps either at
the ZN510 Loop Controller or by
pushing the
ON
button of the zone
sensor. This will send the units to an
occupied bypass, which
will turn the
pumps on prior to operating
manual output test.
Table 12
: Test sequence
Step
Fan
BOP 1
Reversing Valve
BOP 2
Compr 1
BOP 4
Compr 2
BOP 5
Damper
BOP 6
1. Off
Off
Off
Off
Off
Closed
2. Fan on (At the beginning of step 2, the
controller attempts to clear all diagnostics).
On
Off
Off
Off
Closed
3. Reversing Valve
On
On
Off
Off
Closed
4. Cool 1
On
On
On
Off
Closed
5. Cool 2
On
On
On
On
Closed
6. Compressor(s) off
This stage helps avoid compressor cooling
and heating in sequential steps by turning the
compressors off prior to changing the
reversing valve state.
On
Off
Off
Off
Closed
7. Heat 1
On
Off
On
Off
Closed
8. Heat 2
On
Off
On
On
Closed
9. Outdoor air damper
On
Off
Off
Off
Open
10. Exit
After the outdoor air damper step, the test
sequence performs the exit step. This
initiates a reset and attempts to return the
controller to normal operation.
Troubleshooting
