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Other types of connections, for example welding or soldering are not recommended by TRANE, be-
cause of risk of fire to neighboring materials. If one of those types of connections are chosen, the
acting assembler is fully responsible for this task.
The piping for the heat exchanger should not hinder any maintenance required.
The connection of the heat exchanger is to execute as indicated on the label on the AHU (connec-
tion diagrams in Figure 57).
Figure 57: Heat exchanger connection
The heat exchanger operates according to the (cross-)counter-flow principle. Only preheat ex-
changer can be supplied for parallel flow operation on request by the customer.
1. All standard heating and cooling heat exchangers - counter flow
2. Preheat exchanger if there is a freezing risk and can be requested - parallel flow
Hydraulic connection schemes of heating or cooling coil should be carried out as shown in the
scheme Figure 58 with a three way valve as a mixing valve. Compared with a flow control using a
straight-through valve this connection avoids unequal temperature profiles, in that way air heating or
cooling is quite uniform along the coil surface.
Figure 58: Hydraulic connection scheme
To vent and drain the heat exchanger connection, valves are mounted (on request). To ensure that
the correct operation is undertaken, it is important that the vent is on the highest point of the whole
water cycle and the drain at the lowest. Otherwise, the valves need to be mounted on another suita-
ble point on the circuit.
36/115
V07-19.0
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