Maintenance; Removing The Steam Cylinder; Replacing The Steam Cylinder; Annual Maintenance - Liebert CR020 User Manual

50 Appendix 1 Humidair Humidifier
by varying 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, consult Emerson services.
2. When starting with an empty cylinder, the water conductivity is normally insufficient for the humidifier steam output
to be reached immediately. Therefore the humidifier produces as much steam as possible to fill the cylinder
completely. Any evaporation water is immediately refilled. The drain valve is kept shut and therefore, as the steam
does not contain any salts, the conductivity of the water within the cylinder slowly increases until the humidifier 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.

5. Maintenance

5.1 Removing The Steam Cylinder

To remove the steam cylinder, proceed as follows (see Figure 3):
1. Open the general switch relative to the humidifier.
2. Drain all the water from the cylinder by activating 'HUM. DRAIN' in the control service menu several times.
3. Disconnect the steam hose (S) (made of non-conductive 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).

5.2 Replacing The Steam Cylinder

When the steam cylinder is approaching the stage where it needs to be replaced, warning A25 is generated to advise
the user that the cylinder must be replaced. To replace the cylinder, proceed as follows (see Figure 3):
1. Carry out the instructions in 5.1 Removing The Steam Cylinder.
2. Using the new cylinder, carry out procedures 4 ~ 6 in 5.1 Removing The Steam Cylinder 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 iCom service menu). Then switch it off.
5. Drain the water as for procedure 2 in 5.1 Removing The Steam Cylinder.
6. If the air conditioner features an iCom CDL 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.

5.3 Annual Maintenance

Annually carry out the following service on the humidifier (see Figure 3):
1. Carry out the instructions in 5.1 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 (D).
8. Clean all parts of the drain valve using a commercially available descaling agent (to remove any incrustations).
9. Detach the hose from the supply valve.
10. Remove the supply valve connection (N).
Liebert.CRV Series Air Conditioner User Manual