172
17. Servicing
Guide
17.1 How to take out Front Plate
Open and Close Front Plate
1 Remove the 2 mounting screws of Bottom
Front Plate.
2 Slide it upwards to unhook the Bottom Front
Plate hook.
3 Reverse above steps 1~2 for close it.
CAUTION
Hook
2X (screw)
Open or close the Front Plate carefully.
The heavy Bottom Front Plate may injures
the
fi
ngers.
17.2 Test Run
1 Before test run, make sure below items have been checked:-
o
Pipework are properly done.
o
Electric cable connecting work are properly done.
o
Tank Unit is filled up with water and trapped air is released.
o
Please turn on the power supply after filling the tank until full.
2 Switch ON the power supply of the Tank Unit. Set the Tank Unit RCCB/ELCB to “ON” condition. Then,
please refer to the Operation Instruction for operation of Remote Controller.
3 For normal operation, Water Pressure Gauge reading should be in between 0.05 MPa and 0.3 MPa. If
necessary, adjust the Water Pump SPEED accordingly to obtain normal water pressure operating range. If
adjust Water Pump SPEED cannot solve the problem, contact your local authorized dealer.
4 After test run, please clean the Magnetic Water Filter Set. Reinstall it after finish cleaning.
17.3 Expansion Vessel Pre Pressure Checking
For Space Heating / Cooling
Expansion Vessel with 10 L air capacity and initial pressure of 1 bar is installed in this Tank Unit.
Total amount of water in system should be below 200 L.
(Inner volume of Tank Unit’s piping is about 5 L)
If total amount of water is over 200 L, please add another expansion vessel. (field supply)
Please keep the installation height difference of system water circuit within 10 m.
The expansion vessel capacity required for the system can be calculated from the formula below.
V =
×
Vo
Ɛ
1 -
98 +
P
1
98 +
P
2
V
: Required gas volume
<expansion vessel volume L>
V
O
: System total water volume <L>
Ɛ
: Water expansion rate 5
→
60
˚
C = 0.0171
P
1
: Expansion tank filling pressure = (100) kPa
P
2
: System maximum pressure = 300 kPa
-
( ) Please confirm at actual place
-
The gas volume of the sealed type expansion
vessel is presented by <V>.
•
It’s advised to add 10% margin for required gas
volume of calculation.
Water expansion rate table
Water temperature (°C)
Water expansion rate
Ɛ
10 0.0003
20 0.0019
30 0.0044
40 0.0078
50 0.0121
60 0.0171
70 0.0228
80 0.0291
90 0.0360
[Adjustment of the initial pressure of the expansion
vessel when there is a difference in installation height]
If the height difference between the indoor unit and
the highest point of the system water circuit (H) is
more than 7m, please adjust the initial pressure of the
expansion vessel (Pg) according to the following
formula.
Pg= (H*10+30) kPa