Unique Broadband Systems Ltd. DRU1KW Manual De Usuario

 

 

Always ensure that the AC power to the air-to-air heat exchanger/heater 
has been switched OFF prior to removing the air-to-air heat 

exchanger/heater.  This will prevent injury caused by electric shock and 
prevent damage to equipment. 

 

Always remove/install the air-to-air heat exchanger/heater with the aid 
of a second handler.  The air-to-air heat exchanger/heater weighs 

approximately 50 lbs. 

 
 

 
The HB cabinet or LB cabinet air-to-air heat exchanger/heater should be removed in the 

following sequence: 
 

1.  Open the electronics compartment front and rear doors for the corresponding sub-

system. 

2.  Switch OFF the HE circuit breaker (CB 5), located on the HB cabinet PDU or LB cabinet 

PDU. 

3.  Disconnect the 8-pin pluggable AC/communications terminal block from the air-to-air 

heat exchanger/heater inside panel – see Figure 6-9.  The pluggable terminal block 
can be removed from the air-to-air heat exchanger/heater inside panel by loosening 

the two (2) slotted screws.  Do not remove the individual wires from the pluggable 
terminal block. 

4.  Cut the cable ties which secure the two (2) temperature sensor cable assemblies 

(ELECTR COMP AIR INTAKE and ELECTR COMP AIR EXH) to the air-to-air heat 

exchanger/heater inside panel – see Figure 6-9. 

5.  Remove the twelve (12) 1/4-20 security socket head cap screws (with 1/4” flat 

washers and gaskets) which secure the air-to-air heat exchanger/heater to the cabinet 
– see Figure 6-10. 

6.  Using two handlers, one located on each side of the air-to-air heat exchanger/heater, 

carefully lift the air-to-air heat exchanger/heater from the side of the cabinet and set 
it aside.  Ensure that the weatherproof gasket is not stuck to the side of the air-to-air 

heat exchanger/heater. 

 

 
 

 
 
 

 
 

SX03-20000-01-M01 6-21