Fig. 10 Power Supply Isolation Unit
1 Incoming supply cable
2 Outgoing connection to RCU electronics housing (10 A IEC outlet)
3 Outgoing connection to cubicle heater (10 A IEC outlet)
4 Toggle switch
3.3.4 Cubicle Heater
The cubicle heater (part 3AX1350-8A) is an optional accessory that mounts behind the radio tray
and plugs into the power supply isolator. It uses a natural convection to heat the cubicle, i.le., there
is no fan. It has a positive temperature coefficient element which acts as a thermostatic heater
keeping the battery and electronic compartment above -15
O
C for ambient temperatures as low as -
30
O
C.
The heater is required for climates:
Where the temperature can fall below -20
O
C or
Where the temperature will regularly fall below -10
O
C or
Where condensing humidity is a recurrent problem
The heater is suitable for continuous operation AC: 90 V to 265 V.
Note that a Power Supply Isolation unit is required if a heater is fitted.
The heater is not suitable for fitting to a solar powered RCU.
The surface of the heater may be hot.
The surface grill of the heater may reach 30
O
C higher than the ambient air temperature inside the
cubicle.
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