Enertech AV Series - Troubleshooting

Enertech Global, LLC 44
AV : MD/ME - Rev. A Models
Installaon and Operaons Manual

The EEV modulates as needed to maintain 8°F superheat.
Above the setpoint causes the EEV to open and below causes
it to close. The EEV remains completely closed when the
system is idle. Movement of the valve can be observed on the
LEDs of the driver in the lower control box.
Note: In some condions it is normal for the EEV to open
100% and the superheat to be above 8°F.
Defrost Controls
The EAV outdoor unit has a built-in defrost control that
monitors air coil temperature, outdoor air temperature, run
me, compressor RPM, and operaon mode. In the heang
or DHW mode, there are two types of defrost cycles, acve
defrost and passive defrost.
Passive Defrost
If the outdoor temperature is above 39°F and the compressor
is not operang but the air coil temperature indicates that
defrost is necessary, passive defrost starts. In passive defrost
mode, the reversing valve does not shi. The fan runs at
high speed to aempt to increase coil temperature with the
outdoor air temperature. If there is a compressor demand,
passive defrost stops and the compressor starts. Acve defrost
may be enabled, depending upon coil temperature when the
compressor is running.

Acve defrost mode starts when the air coil temperature
(thermistor BT16) falls below 27°F. Acve defrost can occur
as infrequently as once every 12 hours (for calibraon
purposes) or as oen as once every 90 minutes, depending
upon coil temperature, outdoor air temperature, and amount
of moisture in the air. Time unl “acve defrosng” is shown
in minutes on the indoor module HMI display. During acve
defrost, the reversing valve shis to cooling mode, the fan
stops, and the compressor connues to run unl the coil
temperature (BT16) reaches 37.4°F or the discharge gas
temperature reaches 140°F. Defrost mode connues for 90
seconds once either temperature is reached.
Unsuccessful Defrost
If the unit is unable to nish an acve defrost cycle ten mes
in a row (there is no me limit), an alarm will be displayed,
and the control will not aempt to operate the compressor.
The power must be cycled to reset the unit. There are several
possible reasons for an unsuccessful defrost, as follows:
1. When defrosng has gone on for longer than 15 minutes.
This may be due to a strong wind eect on the air coil. A
wind shield may be necessary.
2. When the water/anfreeze temperature on the line
entering the outdoor unit (thermistor BT3) falls below
50°F.
3. If the temperature of the air coil connues to drop.
Insucient airow through the air coil or insucient water
ow to the outdoor unit should be inspected and checked if
it is unable to complete a successful defrost. If the unit has
a signicant amount of leaves around the air coil or if the
coil needs cleaning, the coil may not be able to transfer heat
properly. Insucient water ow is generally due to a pump
failure and should be displayed as a water ow fault at the
HMI.

Defrost may be acvated manually for service or tesng
purposes. A toggle switch is located in the “Manual Control”
menu at the HMI.
Safety Defrost
If the air coil is too cold, a “safety defrost” starts. This defrost
cycle can be started earlier than a normal acve defrost. If
there are ten safety defrost cycles in a row (there is no me
limit), an alarm will be displayed, and the control will not
aempt to operate the compressor. The power must be cycled
to reset the unit.

The following ps can be used to recfy comfort issues:
Note: As EAV can be connected to a large number of external
units, these should also be checked.
Note: In the event of acon to recfy malfuncons that
require work within screwed hatches the incoming electricity
must be disconnected at the safety switch.
Note: The alarm is acknowledged on the EME/EMD module
or by the voltage to the heat pump being interrupted and
then restarted.

Low hot water temperature or a lack of hot water:
This part of the fault-tracing secon only applies if the heat
pump is connected to the hot water heater.
• Large hot water consumpon.
- Wait unl the hot water has heated up.
• These sengs are made on the display on the indoor
module/control module.
- See the secon for the indoor module or control
module.
• Clogged strainer.
- Check whether alarm “high condenser out” (162 is an
informaon message. Check and clean the strainer.

Temperature Cooling
• Thermostats o in several rooms.
- Set the thermostats to max in as many rooms as
possible.
• Zone panel is not showing heang/cooling calls.
- Check sengs.
• Incorrect sengs in indoor module or control module.
- See the manual for the indoor module / control module
(EME/EMD Series).
• Incorrect ow across the heat pump.
- Check whether alarm “high condenser in” (163) or
“high condenser out” (162) are info messages. Follow the
instrucons for adjusng ow rate.

EAV communicates all alarms to the indoor module/ control
module (EME/EMD Series).
• Ensure that the EAV is connected to the power source and
that compressor operaon is required.
• Check the indoor module/control module (EME/EMD
Series). See Indoor Module secon in this manual.
• Check that the addressing of EAV is correct.
• Check that the communicaon cable has been connected.
Ice build-up in the fan, grille and/or fan cone on the outdoor
module
• De-icing fan is not acvated.
- Acvate “de-icing fan” (menu 5.11.1.1).
Secon 8: Controls