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___________________________________RAH / PAH Ka_________________________________
3.7 SAFETYVALVES
The outlet connections of the external safety valves installed on the unit are equipped with a threaded connection, so they can be connected to a drain pipe if present
and if the installation design and current local regulations allow it.
If present, the valves must be individually piped (through metal piping), to an area where the refrigerant spill cannot damage people or things.
The refrigerant spilled from safety valves is an high pressure, high temperature and high speed discharged gas. Its ow may damage things and people
if directly touched.
The intensity of the noise made by the safety valves opening may damage hearing capabilities of people staying near the unit.
The piping diameter must be no smaller than the safety valves draining pipe ones; refrigerant pressure drops in the line must be as small as possible and in any case
should not provoke a reduction in the discharge rate of the valves.
The piping outlet connection must be done so to avoid that rain water, snow, ice, and dirt can accumulate and obstruct it.
The valve discharge must be done at a suitable distance from other equipments, systems or ignition sources; the discharged refrigerant must not accidentally enter
buildings.
In any case, any pipes on the safety valves discharge, must be made in compliance with current laws and regulation.
3.9 RAH/PAHKaseriesusageeld
The nominal water ow of the standard unit is referred to a delta T 5K between inlet and outlet in connection to the supplied cooling capacity. The maximum allowed
ow is referred to a delta T 3K in connection to the design cooling capacity (higher ow values could cause noise and vibration which could damage the evaporator).
The minimum allowed ow is referred to a Delta T 7K in connection to the design cooling capacity (Lower values could cause too low outlet water temperatures with
the consequent intervention of safety devices and unit stop).
UNIT PURE WATER TEMPERATURE AIR TEMPERATURE
RAH Ka
RAH S Ka
UNIT PURE WATER TEMPERATURE AIR TEMPERATURE
PAH Ka
PAH Ka
1. for different uses contact service department
2. lower temperatures could cause miss functioning
3. higher temperatures could cause the safety devices intervention and the unit stop
4. if water temperature is lower than 5°C (evaporator outlet), besides the use of water and glycol mixtures, recalibrate the anti-freeze thermostat (always
4°C higher than the mixture freezing point) and the set point on the required temperature and on the evaporator Delta T.
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