Water Coil; Aluminium Condensate Drain Pan; Electric Heater - Carrier Atmosphera 42EM Series Manual

4.3 - Water coil

The water coil has aluminium fins mechanically bonded by
expansion onto copper tubes.
Water inlet and outlet connections are 1/2" BSP union nuts
(female). Air purge valves are standard. The coil is integral
with the drain pan and coil access door to ease of removal
during service and maintenance.
NOTE: The connection side for the coil can be changed on
site, by turning the coil. Remember to reverse the water
entering/leaving sides for size 3 (42EM models 3.0, 3.1, 3.2
and 3.3).
Coils available are:
• 2 rows for two-pipe changeover systems or for use with

electric heater.

• 4-row systems.

4.4 - Aluminium condensate drain pan

The main drain pan below the coil and the auxiliary drain pan
below the valves are of one-piece construction to avoid the risk
of leaks. The coil is located on the discharge side of the fan to
facilitate the condensate removal and prevent the risk of bacteria
build-up. condensate removal is via an opening in the base of
the coil protection plate.
Auxiliary drain pan insulation: foam, fire class M1.
Condensate drain connection: 16 mm external diameter.
4.5 - Electric heater
Electric heater-resistance wire type
• Supply voltage: 230 V - 1 ph - 50 Hz
• Heater size and capacity per unit:
- Size 1.0:
- Sizes 2.0, 3.0, 2.1, 3.1:
- Sizes 2.2, 3.2, 2.3, 3.3:
• Each heater is protected with double temperature
protection:
a) Safety thermostat - resetable type. Trip temperature 75°C.
When the trip temperature is reached a thermostat heater
is energised that prevents auto resetting of the thermostat
as long as the power is switched on and there is no air
flow. Resetting of the thermostat is achieved by switching
off the power supply to the heater. The safety thermostat
protects the unit against overheating due to the operation
of the electric heater with no or low air flow.
b) Thermofuse link - fusing temperature 167°C.
NOTE: Minimum air flow must be maintained to avoid
damaging the electric heaters:
• Unit size 1.0: minimum air flow 28 l/s (100 m
• Unit sizes 2.0, 3.0, 2.1, 3.1: minimum air flow 42 l/s
(150 m 3 /h)
• Unit sizes 2.2, 3.2, 2.3, 3.3: minimum air flow 55 l/s
(200 m 3 /h)
WARNING: Disconnect the power supply before carrying out
any work on the unit.
1 x 500 W (+5%; -10%)
2 x 500 W (+5%; -10%)
2 x 1000 W (+5%; -10%)
3 /h)
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