4-Usage and operation
4.5 Functions associated with the buttons
Press for 5 s
Button
Button operation
Unit status
Switch off buzzer or alarm relay,
if alarm active
Press once
Enter parameter programming mode
after entering password
Return to higher subgroup inside the
programming environment until
exiting, saving to EEPROM
Press once
Manual reset of alarms that are no
longer active
Press once
Select higher item inside the
programming environmen
Switch from standby to heat pump
mode (P6= 1) and vice-versa
Press once or
hold
Press for 5 s
Access direct parameters:selection
(as for button on Uc2)
Select item inside the programming
environment and display direct
parameter values/confirm the changes
to the parameter
Press for 5 s
Press once
Select lower item inside the
programming environmen
Switch from standby to chiller mode
(P6= 1) and vice-versa
+
Immediately reset the hour counter
(inside the programming environment)
Start manual defrost on both circuits
Display the terminal Info screen
Press once or
hold
Press for 5 s
Press for 5 s
Press for 5 s
Press for 6 s
14
5-Maintenance and Service
1. Maintenance
Check the water supply and air vent frequently, to avoid lack of water or air in the water loop.
Clean the water filter in a certain period to keep good water quality. Lack of water and dirty
water can damage the unit. The heat pump will start the water pump per 72 hours when it is
not running, to avoid freezing.
Keep the unit in a place which is dry and clean, and has good ventilation. Clean the heat
exchanger in 1 or 2 month and keep good heat exchange rate and save energy.
Check each part of the unit and the pressure of the system. Replace the failure part if there
is any, and recharge the refrigerant if it is needed.
If the heat pump is not used for a long time, please drain out all the water in the unit and
seal the unit to keep it good. Please drain the water from the lowest point of the heat
exchanger to avoid freezing in winter. Water recharge and full inspection on the heat
pump is needed before it is restarted.
Check the power supply and the electrical system, make sure the electrical components are
good, the wiring is well. If there is any part failed with wrong action or smell, please replace
in time.
The water loop of the heat pump MUST be protected from freezing in winter time.Please
pay attention to below suggestions.Nonobservance on below suggestion will invalid the
warranty for the heat pump.
(1) Please do not shut off the power supply to the heat pump in winter. When the air
temperature is below 0
℃
, if the inlet water temperature is above 2
℃
and below 4
℃
,
the water pump will start for freezing protect, if the inlet water is lower than 2
℃
, the
heat pump will run for heating.
(2) Use anti-freezing liquid (glycol water)
Note: if the glycol water is too much, the water flow and water pump will be influenced
and the heat exchange rate will be decreased. This table is for reference, please
use anti-freezing water according to the real condition of the local climate.
Please drain out the water in the super heater of the heat pump unit in winter, when the
super heater is not used.
Anti-freeze liquid (like glycol)must be filled into the cooling water system to avoid
freezing in the area with cold climate;
Volume of the glycol in different unit(see below table):
As for how to add anti-freeze liquid(like glycol), pleaserefer to the Users Manual.
Liquor
consistence
%
Weight
Volume
Freezing
℃
5
4.4
-1.4
10
8.9
-3.2
15
13.6
-5.4
20
18.1
-7.8
25
22.9
-10.7
30
27.7
-14.1
35
32.6
-17.9
40
37.5
-22.3
15
