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Operating Checks and Service Regulations
Steam Generator Check
All prescribed checks are included in the Installation Instructions
attached to the steam generator. Please follow these instructions,
especially the following:
First 5 hours of operation: check the water conductivity (min.
5 refills per water exchange cycle, sparking and max. current
checking); check the cylinders for condition (water leakage) and
operation; check the tightening of electrical connections.
Every three months: check the steam generator operation (number
of water refilling switching per cycle) and the condition of the
cylinders (water leakage, condition of electrodes and inner casing
of the cylinder).
Yearly or every 2500 service hours: replace the boiling cylinders;
check the condition and shape of hoses; check the sealing of the
distributing tubes inside the chamber; check the tightening of
electrical connections.
Warning: Attention-electrical equipment! The steam generator
cylinder can be hot. In case of water leakage, hazard of burning and/
or electric shock exists! The intervals of inspections and service life
of parts can vary depending on the water quality and operating
conditions.
Checking the Electric Heater
Check the heating coils for fouling; vacuum the heating coils if
necessary.
Check the functionality of the safety thermostats.
Checking the Plate Heat Exchangers
Check the heat-exchanging surfaces of the plate heat exchanger
for fouling.
Check the by-pass and mixing dampers for fouling and
functionality (if included in the system).
Check the condensate drainage for functionality
If fouling of the heat exchanger is found, clean it. Using the correct
filtration class of filter inserts inside the air-handling unit has a
major impact on the plate heat exchanger fouling. If excessive
fouling of the plate heat exchanger is found, the condition of the
filters must be checked, or filter inserts of a higher filtration class
must be installed.
The entire block of the plate heat exchanger can be cleaned
using the following procedure:
Remove dust and lint using a soft brush or vacuum cleaner.
Grease or oil traces can be removed using warm water or suitable
grease solvents. Use only harmless cleaning agents.
If compressed air is used to clean the plate heat exchanger,
be careful to avoid damaging the heat exchanger's fins. They
are made of thin aluminium sheets! Keep the air gun at a safe
distance.
High-pressure cleaning equipment can be used if the following
conditions are met:
- A special 40° nozzle for sensitive surfaces must be used.
- Maximum allowed water pressure is 100 bars.
When cleaning, avoid any mechanical or chemical damage to the
plate heat exchanger.
Checking the Rotary Heat Exchangers
Rotary heat exchanger condition inspections must be performed
regularly; checking the rotor for cleanliness is the most important part
of these inspections. 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:
Air Handling units AeroMaster XP
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. The rotary heat exchanger rotor can be cleaned by
pressurized air, steam or pressurized water. Failure to perform mainte-
nance can results in permanent damage to the rotary heat exchanger
rotor and very expensive repairs.
Gas Heater Section Check
The gas heater inspection must be carried out once a year, including
the burner adjustment and flue gas measurement!
Verification Measurements
After completing the regular inspection of the air-handling unit, it is
necessary to verify and record its actual performance parameters.
Water Connected Air-handling Component
Installation
Recommendations on water quality for heat exchangers that operate
using low pressure hot water (LPHW) and chilled water:
A good water quality – e.g. salt and lime-free drinking water –
increases the lifetime and efficiency of the heat exchanger.
Check the limiting values shown in the table annually to prevent
damage to the hydraulic system and its components.
If necessary inhibitors must be added.
Note: These limiting values are only basic information about the water
quality and do not form any basis for a guarantee!
Description
Hydrogen ion
concentration
Calcium and
magnesium content
Chloride ions
Carbon dioxide
Iron ions
Carbon dioxide
Hydrogen sulphate
Oxygen
Chlorine
Ammonia
Ratio of carbons/
sulphates
1/1,78 °D = 1 °Fr, with 1°Fr = 10 g CaCO
ppm = parts per million (mg/l)
ppm = parts per billion (µg/l)
Effects in vent
Values
Symbol
of deviation
< 7
pH
7,5 - 9
> 9
Hardness (Ca/
4 – 8,5 °D
> 8,5
Mg)
Cl-
< 50 ppm
Fe
3+
< 0,5 ppm
Mg
2+
< 0,05 ppm
CO
< 10 ppm
2
H
S
< 50 ppb
2
O
< 0,1 ppm
2
Cl
< 0,5 ppm
2
NH
< 0,5 ppm
3
HCO
2-
/SO
2-
>1
<1
3
4
/m
3
3
Corrosion
Fouling
Fouling
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
23
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