GVZC20 Installation Manual
11
NOTICE
A system verication test is required to check the
equipment settings and functionality.
Inverter units are tested by any of the following methods:
• Setting the “SUt” menu (System verication test)
to ON through the indoor unit control board push
buttons.
• Setting the System verication test menu of mode
display screen-4 to ON through the outdoor unit
control board push buttons.
• Through the CoolCloud HVAC phone application
Once selected, it checks the equipment for approximately 5
- 15 minutes. System test may exceed 15 minutes if there
is an error. Refer to the Troubleshooting section.
NOTICE
The CoolCloud HVAC phone application was designed
to improve the contractor’s setup /diagnostic experience.
This application can only be used with ComfortBridge
compatible indoor units and can be downloaded through
the Google Play or Apple App Store.
Users can see specic model information, review active
diagnostic error codes, observe system status during
operation, make system menu adjustments, add site visit
notes and run system testing of all operational modes (heat
/ cool / fan) directly from the phone.
If installing with a CTK04 thermostat, please see the
addendum for further instructions.
CHARGE MODE allows for charging of the system.
System operates for a duration of approximately one hour
while the equipment runs at full capacity.
After one hour, the CHARGE MODE ends and the system
resumes normal operation.
Before starting the CHARGE MODE, turn o the Cool or
Heat mode and electric heater or gas furnace.
a. Inverter units are charged by any of the following
methods:
• setting the “CR9” menu (Charge Mode) to ON through
the indoor unit control board push buttons.
• setting the Charge mode menu of mode display
screen-4 to ON through the outdoor unit control board
push buttons.
• Through the CoolCloud HVAC phone application.
b. The System will remain in charge mode (high speed)
for 60 minutes before timing out.
c. When charge mode is complete, the installer must
manually shut o.
If installing with a CTK04 thermostat, please see the
addendum for further instructions.
Using service equipment, add or recover refrigerant
according to the calculation in Step 1. Allow system to
stabilize for 10 minutes after adjusting charge level.
1. Purge gauge lines.
2. Connect service gauge manifold to base valve service
ports.
3. Convert the liquid pressure to temperature using a
temperature/pressure chart.
4. Temporarily install a thermometer on the liquid line at
the liquid line service valve.
a. Ensure the thermometer makes adequate contact
and is insulated for best possible readings.
5. Subtract the liquid line temperature from the
converted liquid pressure to determine subcooling.
6. Before starting the subcooling adjustment, make sure
the outdoor ambient temperature is in a below range
and the unit is operating at 100% capacity.
7. For EEV Indoor Unit: If the system subcooling is not
within the ranges shown in the following table, adjust
subcooling according to the following procedure:
a. If subcooling is low, add charge to adjust the
subcooling as specied in the following table.
b. If subcooling is high, remove chargee to lower the
subcooling to 8° ± 1°F (*1).