GVZC20 Installation Manual

14
(If using a CTK04 thermostat, please see the addendum
for further instructions.)

The heat pump’s diagnostics menu provides access to the
most recent faults. The six most recent faults can be
accessed through the control board seven segment
displays or the CoolCloud mobile app. Any consecutively
repeated fault is stored a maximum of three times.
Example: A leak in the system, low refrigerant charge or an
incompletely open stop valve can cause the unit to ash
error code E15. This error code suggests that the unit is
experiencing operation at low pressure. The control will
only store this fault the rst three consecutive times the
fault occurs.




This menu displays information about the systems current
status. This menu can be utilized to conrm correct
functionality of the equipment and for troubleshooting
purposes.
The following items will be displayed:
• Heat Capacity Request Percentage
• Cool Capacity Request Percentage
• Heat Capacity Request During Defrost Percentage
• Dehumidication Request Percentage
• Reversing Valve Status
• Reported Airow by Indoor Unit
• Boost Mode
• Previous Defrost Run Time

The following sensor values will be displayed:
• Outdoor Temperature
• Coil Temperature
• Liquid Line Temperature
• Discharge Temperature
• Defrost Sensor
• Suction Pressure

This function can be enabled in this menu.

The mandatory system verication test is enabled from this
menu, which enables a functional check of the equipment,
in addition to ensuring proper stop valve position.

The system allows for the adjustment of several cooling
performance variables. Cool Airow Trim (*1), Cool Airow
Proles, Cool Fan ON Delay, Cool Fan OFF Delay and
Dehumidication Select (some enable option or o󰀨) can
be adjusted in this menu. You can also reset this entire
menu to factory default settings. See the following images
showing the four cooling airow proles.

•  provides only an OFF delay of one (1)
minute at 100% of the cooling demand airow.
•  ramps up to full cooling demand airow
by rst stepping up to 50% of the full demand for
30 seconds. The motor then ramps to 100% of the
required airow. A one (1) minute OFF delay at 100%
of the cooling airow.
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
•  ramps up to 82% of the full cooling demand
airow and operates there for approximately 7 1/2
minutes. The motor then steps up to the full demand
airow. Prole C also has a one (1) minute 100% OFF
delay.
100% CFM
OFF
OFF
•  (default) ramps up to 50% of the demand
for 1/2 minute, then ramps to 82% of the full cooling
demand airow and operates there for approximately
7 1/2 minutes. The motor then steps up to the full
demand airow. Prole D has a 1/2 minute at 50%
airow OFF delay.
OFF
OFF


This menu allows for the adjustment of several heating
performance variables. Heat Airow trim (*1), Heat Fan ON
Delay, Heat Fan OFF Delay and timed Defrost interval can
be adjusted in this menu. Time interval of 30, 60, 90 and
120 minutes between two defrost cycles can be set to suit
the weather conditions and performance of the unit.