Remak AERO MASTER XP Series Installation And Operating Instructions Manual page 35

XPXR Regeneration Exchanger Section
Figure 4 – Heat Exchanger Wiring Diagram
FIA Controller
1,...6
-Terminals for connection of temperature
sensors(connected as standard)
7, 10
-Terminals for connection of speed detector
(connected as standard)
Rotary heat exchanger condition inspections must be performed
regularly; checking the rotor for cleanliness is the most important part
of these inspections. To monitor the heat exchanger rotor fouling,
it is advisable to perform regular checking of the heat exchanger
rotor pressure loss. The heat exchanger rotor pressure loss must not
exceed 15% of the pressure loss value measured on a new rotary
heat exchanger. The user will determine the intervals for regular
inspections according to the operating conditions, however, at least
once every 3 months. At the same time, the user must perform the
following checks:
 Check the functionality.
 Check the rotor for cleanliness.
 Check the sealing brushes for tightness.
 Check the rotor condition and tension
of the driving belt.
 Check fouling of filters; inlet and outlet
If fouled or damaged, the filters must be replaced with new ones
immediately. If any fouling of the rotor is found, the user must ensure
its expert cleaning. Failure to perform maintenance can result in
permanent damage to the rotary heat exchanger rotor and very
expensive repairs.
Heat Exchanger Antifreeze Protection
At very low temperatures, usually from -15°C to -20°C, the heat
exchanger will start to freeze on the outlet side (hot and moist air will
condense on the cold rotor surface). Excessive ice build-up can restrict
the air flow through the rotor to such an extent that the heat ex-
changer pressure loss exceeds the bearing capacity, causing the rotor
to collapse (tearing of the reinforcement bars from the rotor centre).
The general rule is that the thermal capacity of the heat exchanger
directed from the room towards the outdoor space must be higher
than the thermal capacity coming in. The following antifreeze protec-
tions can be used with rotary heat exchangers:
 Speed control or safety turning off of the heat exchanger
 Inserting a preheating device on the cold air side
Air Handling units AeroMaster XP
XPFM Control
U, PE, N
- Power supply section terminals of
the heat exchanger with autonomous
control 1f-230/50Hz
12, 13
- Remote signalling terminals of the
rotary heat exchanger status (12,
13 closed – for disconnected power
voltage or failure status)
7, 9
-Terminals for connection non-
potential contact for the neat
exchanger switching (START)
U1, V1, W1
-Motor connecting terminals
(connected as standard)
XPTG Section (gas heating):
Involvement of the gas burner and triple thermostat must be carried out in accordance with the documentation on these
devices. Relevant documentation is included in the accompanying technical documentation of XP unit.
U, PE, N
- Power supply section terminals of
the heat exchanger with frequency
inverter control 1f-230/50Hz
2, 3
- Terminal for connection of control
signal 0-10V DC
6, 8
-Terminals for connection non-
potential contact for the neat
exchanger switching
U1, V1, W1
-Motor connecting terminals
(connected as standard)
Downward speed control using a frequency inverter can reduce the
heat (cold) transfer and thus adjust the thermal capacities of the heat
exchanger above freezing level. The advantage of this solution is that
the heat exchanger is not stopped. If antifreeze protection without
output control (FI) is used, the rotor will be stopped if frozen, and
simultaneously the entire heat transfer capacity through the heat
exchanger is stopped, too. So heat exchanger antifreeze protection
can be resolved as follows:
 By rotor speed control using a step-less controlled frequency
inverter and a temperature sensor (reading the outlet air tempera-
ture behind the heat exchanger).
 By monitoring the heat exchanger pressure loss and stopping it
(without FI, or with FI FIA).

Using a preheating device
Heat Exchanger Cleaning
There are several ways of how to clean rotary heat exchangers, includ-
ing specially adapted cleaning machines. An appropriate cleaning
method must be chosen depending on the level of rotor fouling. In
normal conditions, the rotor has a certain self-cleaning ability due
to continuous changing of the air flow direction (inlet x outlet). The
flushing chamber prevents particles from the outlet air from passing
due to rotation into the inlet air. However, this flushing chamber does
not in any way contribute to rotor cleaning. If the sealing brushes
are properly installed, they will help in cleaning (sweeping) the heat
exchanger face surface.
The most frequently used cleaning methods are:
 Cleaning using compressed air

Cleaning using compressed water
 Steam cleaning
 Combined cleaning using hot water/compressed air
Improper cleaning process leads to serious
threat of major damage to the exchanger
rotor!
No control
U1, V1, W1, PE
- Power supply
section terminals of
the heat exchanger
3f-400/50Hz
35