36
9. Water Circulation
Check water pipe is correctly connected, if not, the
unit can not work normally.
9.1 Check Water Circulation
(1) Water module is connected to water
circulation system through water inlet and outlet.
This water circulation system must be installed by
qualified plumber in accordance with relevant
national regulations.
(2) Water module is only applicable to closed water
system. When applied to opened water system,
water pipe may be corroded.
(3) Check before water module installation:
● The maximal water pressure in system is no more
than 0.3Mpa. If make-up water pressure on site is
more than 0.3Mpa, recommend reducing valve or
automatic make-up valve is mounted on site.
● Outfall should be the lowest point of system, drain
all circulated water from system when system is
maintained.
●
Ensure safety valve can drain water normally,
avoiding water flowing into electrical parts.
● Air exhaust device should be arranged at highest
point of system. Check automatic vent valve in
water module discharges air normally and whether
the sound of quick venting occurs. If vent valve
leaks water or is damaged, contact local dealer.
9.2 Check Water Capacity and Initial
Pressure of Expansion Tank
(1) The unit has a built-in 8L expansion tank, and
default initial pressure is 0.1MPa.
(2) To ensure the unit works normally, the initial
pressure of expansion tank should be adjusted
according to the circulated water capacity.
● Check the total capacity of water in circulation
system is 16L at least. In most cases, this minimal
capacity will be appropriate.
●
Use water capacity checklist 9.1 to decide whether
initial pressure of expansion tank needs to be adjusted.
●
Use water capacity checklist 9.1 to confirm the total
capacity of water in installation system is below the
allowed maximal water capacity.
●
Installation height difference: It is the height
difference between highest point of water
circulation and water module. If water module is
mounted at the highest point, above all water
pipes, the installation height is deemed to be 0 m.
(3) Calculate initial pressure of expansion tank
Decide initial pressure (Pg) according to the
maximal installation height difference (H), seen
below:
Pg=H/10+0.3
Unit: H(m), Pg(bar)
Note: 0.3 is the minimal initial pressure of expansion
tank set outside the factory.
(4) Confirm allowed maximal water capacity
The process of calculating allowed maximal
water capacity in whole circulation is:
① Calculate maximal water capacity corresponding
to initial pressure Pg by using maximal water
capacity curve graph 9.2.
②
Confirm the total maximal water capacity in
water circulation is smaller than above value. If
not, the expansion tank in water module is
smaller for system.
● When initial pressure in expansion tank is set as
0.03MPa at minimum, the water quantity
required by system is higher than limit value, it
may consider replacing expansion tank with
bigger capacity.
● The mismatch between big capacity expansion
tank and water module structure may cause
expansion tank unable to be mounted into water
module.
● If big capacity expansion tank mismatches with
water module structure, safety valve with higher
action pressure can be selected, and do not
vary capacity of expansion tank. Select safety
valve with action value 0.5Mpa.
● When initial pressure in expansion tank is set as
0.03MPa at minimum, the water quantity
required by system is higher than limit value, it
may consider replacing expansion tank with
bigger capacity.
● The mismatch between big capacity expansion
tank and water module structure may cause
expansion tank unable to be mounted into water
module.
● If big capacity expansion tank mismatches with
water module structure, safety valve with higher
action pressure can be selected, and do not
vary capacity of expansion tank. Select safety
valve with action value 0.5Mpa.
To Next Page
Loading...
