16
7 - Water coIL
7.1 - description
Aluminium fins are mechanically bonded by expansion
onto 3/8” copper tube.
Male/female water inlet/outlet connections are 1/” gas
threaded nut.
ATTENTION: The unit does not incorporate an air vent.
This must be installed during the installation.
Available coils:
•
for -pipe systems (for use with electric heater)
•
for 4-pipe systems
NOTE: Each 42GM has a label showing the position of
the water inlets and outlets on the coil. Ensure that the
water system is constantly under controlled pressure to
ensure the correct charging of the coil pipes.
7.2 - removing the coil
WARNING: Switch off the electrical power supply before
doing any work on the unit.
Removal procedure:
•
Remove the 4GM unit as described in the chapter
‘Removing a 4GM unit’.
•
Lay the module on its non-removable side (fixed by
rivets).
•
Uninstall the removable side, fixed by screws.
•
Disconnect the water piping from the coil side (be
careful not to lose the joints).
•
Unscrew the two screws (A), fixing the condensate pan
(see diagram below).
•
Remove the coil by keeping the condensate pan slightly
pulled out so that it disengages (see diagram below).
•
Insert the new coil, making sure that it is correctly
positioned.
Re-installation procedure:
•
Follow the instructions above in reverse order, and
refer to the unit ‘installation’ procedure.
NOTE: When connecting the new coil to the flexible pipes:
•
be careful not to damage the coil manifolds by
tightening them too much. Carrier recommends the
use of a dynamometric key, set to 15 N·m;
•
install new leak-tight joints between coil, valves and
flexible pipes.
When re-installing the removable unit side ensure that
this is correctly positioned in relation to the coil.
WARNING: Bleed the circuit thoroughly when refilling
the circuit with water.
Screws ‘A’
Pull the pan
out slightly