Remak AERO MASTER XP Series Installation And Operating Instructions Manual page 36

XPXR Regeneration Exchanger Section
Figure 5 – methods of exchanger rotor cleaning
Compressed air can only remove dry, fibrous or larger particles.
Material loosened during cleaning must be constantly removed from
the entire chamber of the heat exchanger. Cleaning must always be
performed following the air flow direction.
Sticky dirt can be removed by water. According to the type of fouling,
cold water, water with detergent, hot water or compressed steam can
be used. The need for water draining is a disadvantage of this type of
cleaning. Combined cleaning using water and compressed air can be
used to collect the water running down from the rotor; the air nozzle
situated under the water nozzle enables the water, including the dirt,
to be carried off by the air flow into the collecting canister situated
on the other side of the rotor. To clean heavily fouled rotors and/or
to avoid damage to the rotor caused by an unqualified approach, we
recommend hiring a specialized provider to clean the heat exchanger.
During the service life of heat exchangers equipped with an enthalpy
coating, tiny particles of enthalpy coating can loosen. This is not a
fault, and the quality of heat and humidity transfer is not affected.
Troubleshooting
Rotor Damage
Rough and/or improper heat exchanger handling, exceeding maxi-
mum permissible air flow velocities as well as neglected maintenance
can lead to permanent damage to the rotor, i.e. causing the wound
layers to slip down, the reinforcement rotor spokes to break and the
entire rotor to collapse. In these cases, expensive rotor replacement
is inevitable.
Rotor Centring
This procedure summarizes the minimum requirements for the heat
exchanger rotor centring. The following conditions must be met:

The heat exchanger rotor is axially attached to the frame using
M16x30 bolts – wrench #24 is needed.
 Access to the rotor centre is enabled through the adjacent sec-
tions in the upper duct line.
 If access through the adjacent sections is not possible, these
sections must be pulled out or removed from the air-handling unit
assembly.
36
Figure 6 – Access to the rotor shaft bolt
PH 1 PH 1
Step 1:
Release and remove the cover of the bolt; it is necessary to use a PH
1 tool.
Note: In some cases, it is possible to centre the rotor from one side;
otherwise, it is necessary to have access to the bolts on both sides of
the heat exchanger.
Step 2:
Basically, there are two ways of how to centre the rotor depending on
the position and access to the shaft bolt:
ad a)
At least two persons are needed for the following procedure. Slowly
loosen the bolt using a ring spanner. Turn a minimum of 1 to 2 turns,
but no more! Never remove the bolt entirely! With an open palm, push
the rotor into the required position. (Use gloves!) In this case, the
weight of the heat exchanger rotor can also be conveniently used
to adjust it to the proper position. Firmly tighten the shaft bolt and
check the position.
Figure 7 – Tighten the shaft bolt using wrench # 24
ad b)
This way of centring is much more precise. The following centring
procedure requires a tightening belt to be used; the belt length can be
4 to 8 meters depending on the rotor size. This centring procedure can
be performed by just one person; however, the following preliminary
actions are necessary:
 Disconnect the power supply
 Remove the 4 side panels