Test Run; Checklist Before Test Run; Checklist During Test Run; Check The Minimum Flow Rate - Hisense Hi-Therma Series Service Handbook

Installation

8.1.10 TEST RUN

NEVER operate the unit without careful inspection.

8.1.10.1 CHECKLIST BEFORE TEST RUN

Do NOT operate the system before the following checks are
OK:
You have read the complete installation instructions of
outdoor unit, indoor unit and master controller carefully.
The indoor unit is properly mounted.
The outdoor unit is properly mounted.
The following field wiring has been carried out according to
this document and the applicable legislation:
▪ Between the local power supply and the outdoor unit
▪ Between indoor unit and outdoor unit
▪ Between the local power supply and the indoor unit
▪ Between the indoor unit and the valves (if applicable)
▪ Between the indoor unit and the room thermostat (if
applicable)
▪ Between the indoor unit and the DHW tank (if applicable)
The system is properly earthed and the earth terminals are
tightened.
The fuses or locally installed protection devices are installed
according to this document, and have NOT been bypassed.
The power supply voltage matches the voltage on the
Nameplate of the unit.
There are NO loose connections or damaged electrical
components in the electrical box.
There are NO damaged components or squeezed pipes
on the inside of the indoor and outdoor units.
Only for DHW tank with electric heater:
Temperature protection switch (Auto restore) has been
already wired.
Temperature protection switch / Temperature fuse has been
already wired.
There are NO refrigerant leaks.
The water pipes are thermally insulated.
The correct pipe size of refrigerant pipes (gas and liquid) are
installed and the pipes are properly insulated.
There is NO water leakage inside the indoor unit.
The shut-off valves are properly installed and fully open.
The stop valves (gas and liquid) on the outdoor unit are fully
open.
The air purge valve is open (at least 2 turns).
The safety valve purges water when open.
The minimum water volume is guaranteed in all conditions.
See section 8.1.8.3 "Check water volume".
The DHW tank is filled completely.
●
The unit starts only when all check points are cleared up.
●
Pay attention when system is running:
(A) Do not touch any parts of discharge pipelines, because the
discharge temperature of compressor can be more than
90°C.
(B) Do not press AC contactor button, otherwise serious accident
may be caused.
● Do not touch any electrical components in 10 minutes after
main power supply is cut off.

8.1.10.2 CHECKLIST DURING TEST RUN

The minimum flow rate during electric heater/defrost
operation is guaranteed in all conditions. See section
"8.1.8.2 Requirements and recommendations for
hydraulic circuit" and "8.1.8.3 Water filling".
To perform an air purge.
To perform a test run.
To perform an actuator test run.
Underfloor screed drying function
The underfloor screed drying function is started
(if necessary).
● When performing test run of floor heating, higher temperature
in indoor unit (up to 55 °C) will damage floors due to expansion
and contraction. Recommend it is within 30 minutes.
● Use the controller to start test run (refer to the manual of
master controller).
● It is normal that after indoor unit is energized, it may
directly enter anti-freezing running mode, and water pump
automatically runs if outdoor temperature is very low.

8.1.10.3 CHECK THE MINIMUM FLOW RATE

Check the hydraulic configuration to find out which
1 space heating loops can be closed by mechanical,
electronic, or other valves.
2 Close all space heating loops that can be closed.
Start the pump test run . See setting of DSW4-8 in
3
section "8.1.9.5 DIP Switch Setting of PCB1" .
Read out the flow rate and modify the bypass valve
4 setting to reach the minimum required flow rate +
2L/min.
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