Trane CGCN Installation Operation & Maintenance page 19

• If measurements or controls must be carried out which require the machine to be running the following
observations must be followed:
• operate with the electrical panel open for as short a time as is possible.
• close the electrical panel as soon as the individual measurement or control has been carried out.
• for units which are located outside, do not carry out interventions in dangerous atmospheric conditions such
as rain, snow, fog etc.
• The following precautions should also be taken at all times:
• never dispose of fluids contained in the refrigerant circuit into the environment.
• when replacing an EPROM or electronic card always use appropriate equipment (extractor, anti-static
bracelet, etc.).
• if a compressor, the evaporator, the condensation coils or any other heavy part is to be replaced, make sure
that the lifting equipment matches the weight to be lifted.
• in the air cooled units with an independent compressor compartment, do not open the ventilator compartment
without having first isolated the machine using the knife switch on the side of the panel and only after having
placed a sign which says "do not use - maintenance in progress".
• if modifications must be carried out to the cooling, hydraulic or electrical circuit of the unit, as well as to its
command logic, contact Trane.
• if particularly complicated assembly or disassembly operations are to be carried out contact Trane.
• always use original spare parts bought directly from Trane or from official dealers of the companies reported
in the list of recommended spare parts.
• if the unit is to be moved after a year of being in the site or if it has to be dismantled contact Trane.
Manual alarm reset
If there is an alarm, the unit must not be manually reset before having located and eliminated the cause of the
fault. Repeated manual resets may cause the warranty to be annulled.
Precaution against frost risk of the hydraulic pipes
It is necessary to insulate pipes in the plant to avoid extreme heat loss and to protect them from weather
conditions. The problem of water pipes freezing could appear in two different situations:

Unit standby, with mode on, but electrically connected: in this case, the unit has frost resistances, which
protect the water locally contained in the exchangers and in the pipes from ice formation. These
resistances do not guarantee the protection against the frost in the outdoor connection pipes, to be
prevent by frost protection systems. Trane suggest to insert frost thermostatic resistances on every
outdoor pipes.
Indicative electric power per pipe linear meter:

Electrically unconnected unit: in this case the frost resistances of the unit could not guarantee the
protection. So it is absolutely necessary unload the unit content for A.C.S., instead for air conditioning it
is necessary to add the correct glycol quantity indicated in the chapter: "Ethylenic glycol correction table".
dn inch W/mt
8 1/4" 5
10 3/8" 5
15 1/2" 5
20 3/4" 10
25 1" 13
40 1" 1/2 30
50 2" 50
65 2" 1/2 80
80 3" 120
100 4" 200
125 5" 300
150 6" 450
200 8" 750