Liebert himod Service Manual page 33

App. A.4 − Start−up and operation
App. A.4.1 − Start−up
Before using the humidifier, check the following:
S Supply and drain connections.
S That the cut−off tap is open.
S All wiring.
S Earthing.
S Steam hose connection between steam cylinder
and distributor.
To start the humidifier simply switch on the air condi-
tioner, which will in turn automatically start and stop
the humidifier as required. The (adjustable) parame-
ters which determine humidifier operation have al-
ready been factory−preset (see HIROMATIC manu-
al).
App. A.4.2 − Operation
Water, provided it contains even a small quantity of
salts in solution, is a conductor of electricity. There-
fore, if the steam cylinder is filled with water and a po-
tential difference is applied between the production
electrodes, the water behaves like an ordinary electri-
cal resistance and becomes hot, thus creating steam.
The steam production rate can be controlled by vary-
ing the water level in the cylinder; the higher the water
level, the deeper the electrodes are immersed into it
and the greater the steam production.
Note 1
In case of low water conductivity the cylinder 93H (9.0
kg/h) or 53H (4.5kg/h) can be substituted with the cy-
linder 93L or 53L without changing the power supply.
Please remember to set the right cylinder type into the
Control system.
The steam production will remain unchanged.
Note 2
When starting with an empty cylinder, the water con-
ductivity is normally insufficient for the HUMIDI-
FIER STEAM OUTPUT to be reached immediately.
Therefore the humidifier produces as much steam as
possible to fill the cylinder completely. Any evapora-
tion water is immediately refilled.
The drain valve is kept shut and therefore, as the steam
does not contain any salts, the conductivity of the wa-
ter within the cylinder slowly increases until the HU-
MIDIFIER STEAM OUTPUT is obtained.
The length of the start−up period depends upon the
water conductivity. For very conductive water it may
occur that the HUMIDIFIER STEAM OUTPUT is
obtained immediately.
App. A.5 − Maintenance
App. A.5.1 − Removing the steam cylinder
To remove the steam cylinder, proceed as follows (see
Fig. 3):
1) Open the General Switch relative to the humidifi-
er.
2) Drain all the water from the cylinder by activating
"HUM. DRAIN" in the HIROMATIC Service
menu several times (see Microface manual).
English
3) Disconnect the steam hose (S) (made of non−con-
ductive rubber).
4) Disconnect the power electrode wires (P) and level
sensor wire (L).
5) Undo the clip (R).
6) Pull the cylinder (C) out of its gland at the bottom
(G).
App. A.5.2 − Replacing the steam cylinder
When the steam cylinder is approaching the stage
where it needs to be replaced, warning A25 is gener-
ated (see HIROMATIC manual) to advise the user
that the cylinder must be replaced. To replace the cyl-
inder, proceed as follows (see Fig. 3):
1) Carry out the instructions in para. Removing the
steam cylinder.
2) Using the new cylinder, carry out 4)−6) of para. 5.1
in reverse order.
3) Connect the steam hose (S); the clip on the hose
needs to be tightened only slightly.
4) Manually switch the humidifier on for 2−3 minutes
(in the HIROMATIC Service menu). Then switch
it off.
5) Drain the water as for 2) in para. Removing the
steam cylinder.
6) If the air conditioner features a HIROMATIC with
Graphic display, reset the humidifier working hours
(window no. 1 of PARAMETER MENU) to zero.
7) Close the General Switch relative to the humidifier.
App. A.5.3 − Annual maintenance
Annually (e.g. before any close−down period) carry
out the following service on the humidifier (see Fig. 3):
1) Carry out the instructions in para. Removing the
steam cylinder.
2) Disconnect the supply (F) and drain (D) valve wires.
3) Unscrew and remove the drain tank (T).
4) Unscrew the drain valve assembly screws (V).
5) Remove the drain valve assembly.
6) Unscrew and remove the drain valve solenoid (O).
7) Unscrew and remove the drain valve armature (A).
8) Clean all parts of the drain valve using a commer-
cially available descaling agent (to remove any in-
crustations).
9) Detach the hose from the supply valve.
10)Remove the supply valve connection (N).
11)Unscrew the supply valve (F) and remove it.
12)Clean the supply valve using a jet of water.
13)Replace any hose which has become hard and
brittle.
14)Thoroughly flush the drain line (E).
15)Reassemble the humidifier by carrying out the
above instructions in reverse order.
ATTENTION
Always empty the cylinder completely before any clo-
se−down period.
A − 3