Euroclima ZHK Series, Instruction Manual, Page: 14 / 131

Instruction Manual ZHK
V07-19.0 13/129
during the work. The housing of the AHU interior lighting (can have separate supply) is not cur-
rent-carrying.
-
all moving parts, especially the fan wheel, motor and heat wheel have come to a standstill; wait
at least 5 minutes after switching off before opening the doors.
-
for maintenance of frequency controlled motors, a waiting time of 15 minutes is recommended
–
it gives time to break down the residual capacitive charge of the frequency converter.
-
Remove the key from doors with door lock before entering in the casing of the AHU. Keep the
key out of reach of unauthorized persons.
-
Check that the hot media supply such as steam is interrupted and all the heat registers, heat
exchangers, etc. are cooled to ambient temperature.
In case of standstill of the plant (e.g. power failure), make sure that the main
switch is always checked. Only when it is in the off position and secured against
unintentional restart, appliance doors can be opened, cable plug connections can
be disconnected and work on the device can be carried out.
Start of the AHU
Ensure after working and before the start that
…
-
nobody is in the AHU.
-
all protective devices are working, (optional safety devices such as the door guard and belt
guard mounted again) and doors equipped with door locks are locked and the keys are re-
moved
–
refer to
chapter 5.2 (Doors)
.
Storage of potential energy in gases and fluids
All heat exchangers can be operating up to a maximum pressure of 15 bar. If the
fluid is under higher pressures, the safety and tightness cannot be guaranteed.
Preventing the risk of explosion and fire spread
To prevent the fire spreading, fire dampers shall be installed into the ducts be-
tween the fire compartments.
Prevention of exposure caused by antifreeze agents
Avoid body contact with antifreeze agents, because they may cause burns. Al-
ways wear appropriate protective clothing (e.g. gloves, goggles, ...).
In case of fire, avoid the danger zone and meet different safeguards. It is recom-
mended to wear a mouth guard, because of the risk of poisoning by inhaling the
vapors.
Prevention of hazards caused by steam heaters or humidifiers
By hot steam there is a danger of burns. Therefore, make sure that no steam
pressure is present and the system is cooled before working on the steam piping.
Avoid any type of ignition source when cleaning the humidifier and the associated
components and circuits by means of descaling agent. With strong descaling
agents, direct sunlight can already cause a fire.
Avoid body contact with descaling agents, as it can cause chemical burns and se-
rious eye damage. When handling descaling agents, wear appropriate protective
clothing (e.g. gloves, goggles,
…) and ventilate the room well.