Components And Maintenance; Fan Motor Assembly Removal; Heaters Removal; Drain Pan Removal - Carrier Idrofan 42EP Installation, Operation And Maintenance Instructions

4 - COMPONENTS AND MAINTENANCE

4.1 - Fan motor assembly removal

- Remove the filter access door in case of units with
inlet plenums.
- Remove the filter.
- Remove the bottom panel (ceiling unit) / top panel
(floor unit).
- Disconnect the fan power supply and control (0-
10V) cables.
- Remove 4 fixing screws and recover the fan
assembly.
Refer to Fig. 12 for more details
NOTE: Be careful not to touch the fan blades during
the removal process to avoid unbalancing the fans

4.2 - Heaters removal

CAUTION: Do not touch the live metal heater
elements when the electric heater is connected to
the power supply.
- For units with the electric heater option, disconnect
the power supply cable to the heater. Withdraw
the cable through the cable gland.
- Remove fixing screws of the electric heaters to
retrieve it.
Refer to Fig. 13 for more details
WARNING: In case of customer supplied controller,
it is the responsibility of the installer to set up an
additional protection relay corresponding to the
electrical heater capacity.
WARNING: With the optional electric heater a
minimum air flow must be maintained else it may
damage the unit (see tables below).
Heaters power supply (W)
Unit size
0
1
2

4.3 - Drain pan removal

CAUTION: After disconnecting power supply, keep
the unit idle for 15-20min to reduce heating circuit
temperature.
Ceiling units
- Disconnect the flexible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
- Remove the bottom panel.
- Retrieve the drain pan by sliding it from the
support.
- During the drain pan removal and maintenance,
lay the end of the coil on the metal support plate
to prevent any damage to the casing.
- Control clamping of the drain pipe and be sure
there is no water leakage.
16
500 800 1000 1600
2Volts 3Volts NA NA
2Volts 3Volts 3Volts NA
2Volts 3Volts 3Volts 3Volts
Floor units
- Disconnect the flexible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
- Remove the top panel.
- Remove the coil
- Retrieve the drain pan by sliding it from the
support.
- During the drain pan removal and maintenance,
lay the end of the coil on the metal support plate
to prevent any damage to the casing.
- Control clamping of the drain pipe and be sure
there is no water leakage.

4.4 - Water Coil removal procedure

CAUTION: After disconnecting power supply, keep
the unit idle for 15-20min to reduce heating circuit
temperature.
Ceiling units
- Close the isolating valves on the manifolds.
- Empty the coil by purging (see Fig. 14)
- Remove the flexible water pipes.
- Remove the valve actuators taking care to identify
the cooling and heating valves.
- Disconnect the flexible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
- Remove the two-way or four-way water flow
control valve bodies. Depending on the unit
configuration the four-way valve coupling may be
fitted with a heating/ cooling changeover switch.
If so, do not remove it.
- Remove the bottom panel.
- Retrieve the drain pan by sliding it from the
support.
- Remove the coil
- After replacement, ensure that all gaskets are
changed (new gaskets fitted) and that the inlet and
outlet connections to the coil are made correctly
using an appropriate sealing compound applied
to the valve body. Bleed all air from the coil during
refilling.
Floor units
- Close the isolating valves on the manifolds.
- Empty the coil by purging (see Fig. 14)
- Remove the flexible water pipes.
- Remove the valve actuators taking care to identify
the cooling and heating valves.
- Disconnect the flexible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
- Remove the two-way or four-way water flow
control valve bodies. Depending on the unit
configuration the four-way valve coupling may be
fitted with a heating/ cooling changeover switch.
If so, do not remove it.
- Remove the top panel.
- Remove the coil
- After replacement, ensure that all gaskets are