Table of Contents
Advertisement
Planning the cooling system
Connection to a customer cooling unit
General requirements
Equip the system with an expansion tank to damp pressure rise due to volume changes
when the temperature varies. Keep the pressure within the limits specified in
Specifications
below. Install a pressure regulator to ensure that the maximum permissible
operating pressure is not exceeded.
Install a bleeding valve at the highest point of the cooling circuit. Bleeding valve is not
included in the ABB converter delivery as standard. It can be ordered as an option
(+G422).
The materials used in the cooling system are listed in
Coolant temperature control
The temperature of the coolant in the internal cooling circuit must be kept within the limits
specified in
Specifications
ambient temperature and relative humidity.
The following diagram shows an example of coolant temperature control using the three-
way valve in the external cooling circuit. Part of the infeed coolant flow is directed into the
return pipe through a three-way valve without letting it circulate in the internal cooling
circuit if the coolant in the internal circuit is too cold.
Internal circuit
on page 136. Note that the minimum temperature depends on
TC
Cooling and heating 131
Specifications
on page 136.
Return
External circuit
Infeed
Advertisement
Table of Contents
