10/6/10 888-2629-200 1-19
WARNING: Disconnect primary power prior to servicing.
Section 1 Introduction
Maxiva ULX COFDM Series
Figure 1-11 Heat Exchanger (before installation)
NOTE:
The heat exchanger shown in Figure 1-11 is a 2 fan unit. It is shown on a shipping
pallet. The two fans that are shown pull air up through the cooling coil/fins (not
visible in the photo) of the unit if mounted horizontally (as shown). This unit can
be mounted horizontally or vertically depending on how the legs are attached to
the heat exchanger. Smaller transmitters may use only one fan.
1.2.8.2.1 Heat Exchanger Fan Control
In multi-cabinet transmitters there will be one heat exchanger and control panel/pump
module per PA cabinet. The fans are controlled electronically. The fans are enabled
whenever the pump module is activated. Factory settings are Fan 1 set point will be set
at 32 C with a 5 degree hysteresis window. This means Fan 1 turns ON at 34.5 C and
shuts off at 29.5 C. Fan 2 set point will be set at 37.5 C also with a 5 degree hysteresis
window. This means Fan 2 turns ON at 40 C and shuts off at 35 C.
1.2.8.2.2 Pump Operation/Control Logic
Pump operation is automatically controlled using a programmable interface device
controller (PID). There are two modes of pump operation, "LOCAL" and "REMOTE".
The PID controller interfaces with the pump control interface (PCI) located in the TCU.
The PID controller receives and sends signals to the transmitter PCI. With "LOCAL"
selected a status signal is sent to the PCI reporting the mode selection. Loss of flow for
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