Drain Pan Removal; Water Coil - Carrier 42NL series Installation, Operation And Maintenance Instructions

Damages may occur if the minimal speed recommendation
is not followed.
Minimum speed 42NH / (Minimum air flow in m
Size Multispeed AC Motor With Elec. Heater
0-1000W
2_5 R5 (70 m /h) NA
3
3_5 R5 (180 m
4_5 R5 (340 m
5_5
R5 (300 m
6_5
7_5
Minimum speed 42NH / (Minimum air flow in m
Size EC Motor With Elec. Heater
0-1000W
2_9 3V (70 m /h) NA
3
3_9 3V (180 m
4_9
3V (275 m
5_9 3V (300 m
6_9
7_9
Minimum speed 42NL / (Minimum air flow in m
Size Multispeed AC Motor With Elec. Heater
0-1000W
2_5 R6 (70 m /h) NA
3
3_5 R6 (180 m
4_5 R6 (340 m
5_5 R6 (300 m
Minimum speed 42NL / (Minimum air flow in m
Size EC Motor With Elec. Heater
0-1000W
2_5 3V (70 m /h) NA
3
3_5 3V (180 m
4_5 3V (275 m
5_5 3V (300 m
/h)
3
1600-2000W 3200W
NA
/h) NA
3
/h) NA
3
NA
/h)
3
R5 (300 m h)
3/
R5 (460 m /h)
3
/h)
3
1500-2400W 3000-3200W
NA
/h) NA
3
NA
/h)
3
/h) NA
3
3V (180 m /h)
3
3V (300 m /h)
3
/h)
3
1600-2000W 3200W
NA
/h) NA
3
/h) NA
3
/h) NA
3
/h)
3
1500-2400W 3000-3200W
NA
/h) NA
3
/h) NA
3
/h) NA
3

4.2 - Drain pan removal

WARNING: Disconnect the power supply to the unit before
carrying out any work on the unit.
• Disconnect the flexible condensate drain pipe held in
place by a collar (the collar is not supplied by Carrier).
• Remove the metal sheet part under the pan by loosing
the two lateral screws and one additional front screw
(see fig. 1, 2 and 3)
• Pull out the drain pan under the unit by sliding it from
its support plate. Remove drain pan from bottom of
unit.
• During the pan removal and maintenance, lay the end
of the coil on the metal support plate to prevent any
damage to the casing (to remove the coil see
procedure in chapter 4.3.).
• Replacement is by the reversal of the procedure
described above (check that the coil lays at the center
of the drain pan as initially)
• Control clamping of the drain pipe and be sure there
is no water leakage.

4.3 - Water coil

4.3.1 - Coil removal procedure
WARNING: Disconnect the power supply to the unit before
carrying out any work on the unit.
• Close the isolating valves on the manifolds.Empty the
water in the unit by opening the drain valve (see Fig.
14)
• Unscrew the union nuts to disconnect 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.
• Loosen the four fixing screws. Pull out the drain pan
and coil assembly (the drain pan remains attached to
the unit for approximately 100 mm) until the coil is
completely detached. Then remove the coil from the
drain pan.
• Replacement is by the reversal of the procedure
described above. 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.
NOTE : if necessary, the coil can also be removed from
under the unit along with the drain pan (see chapter 4.2.
"Drain pan removal")
WARNING: Take care when tightening the valve body to
the coils (15 N·m is sufficient) to ensure they are not
damaged.
NOTE: The orientation of the coil cannot be reversed.
21