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USER'S AND
MAINTENANCE
MANUAL
Date:
22/12/2016
Code
MAN D425T4F ENG
Motor compressor D425T4F
Revision 00
Copyright © 2014, ROTAIR S.P.A. - All rights reserved This manual is intellectual property of ROTAIR S.P.A. Its
full or partial reproduction is forbidden under any form, on any support and by any means, without the written
authorization by ROTAIR S.P.A.
Page
48/57
13.4.5 C
LEAN THE RADIATOR COOLER
The coolants of the compressor and the motor are cooled by a radiator which, consequently, must be kept clean
so that the ventilation air can pass freely and easily through its fins honeycomb.
A radiator fins clogged with dust or any other bodies, because of the harmful and dangerous overheating to the
mechanical screw compressor, greatly jeopardizing the operation and durability. We recommend that you check
it periodically and, if necessary, clean it with compressed air or clean it with a jet of water under pressure.
13.4.6
P
ERCENTAGE DOSAGE OF COOLING LIQUID
To determine the proper amount of antifreeze to be paid within the tank of the radiator (Figure 13.4-3) must
follow the following table:
T (°F)
Total volume of
the cooling plant
Water
volume
Antifreeze
volume
Antifreeze
percentage*
°F
gal
gal
gal
%
- 10 / 14
7.1
3.50
3.50
50%
*Cooling liquid suggestions: ROLOIL ROL-ICE BLU
WARNING: He radiator cap (Figure 10.1
-
3) must never be removed in a warm engine: in this
condition would occur a sudden leakage, which could cause serious burns to the person. The
possible filling must be done with a mixture of water and antifreeze liquid, in the percentage
indicated on the container of the latter.
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