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4.10 - Optional electric heater

WARNING: Disconnect the power supply before

carrying out any work on the unit.

If the electric heater develops a fault, it must be

replaced; this requires the removal of the fan motor

assembly: Fig. 12.

CAUTION: Do not touch the live metal heater

elements when the electric heater is connected to

the power supply.

Electric heater replacement procedure:

■ Remove the filter.

■

Remove the fan motor assembly access panel.

■ Identify and note the fan speeds wired to the auto-

transformer terminal block. Disconnect the power

supply cable.

■

Remove the fan motor assembly.

NOTE: Be careful not to touch the fan blades during

the removal process to avoid unbalancing the fans.

■ Disconnect the electric heater power supply cables

and remove them through the cable conduit.

■ Unscrew the defective heater(s) and replace it (them).

■

Replacement of the fan motor assembly is by the

reversal of the above procedure.Carrier Electronic

thermostat type B is embedded with Electric heater

relay 8 Amps. Accordingly, Carrier requires an

additional protection relay for electric heater with

above 1400 W capacity.

All units delivered with an electrical box or a Carrier

controller are always equipped with a relay if the

capacity of the electrical heater is above 1400W.

WARNING : In case of customer supplied controller,

it is the responsability of the installer to set up an

additional protection relay corresponding to the

electrical heater capacity.

4.11 -

Optional water sensor

A water temperature sensor can be provided. It has to

be installed on the water circuit as described below :

■ For 2-pipe coil : the sensor shall be installed on a

cooling water pipe (for change-over function). The

sensor is installed on a part where the water flow is

continuous.

■ For 4-pipe coil : the sensor shall be installed on a

heating water pipe (for cold-draft function that

prevents the operation of the unit when the heating

network is off).

NOTE: In case of unit with an electrical box (for

Carrier Thermostats), a “switch” is provided as an

option instead of the water sensor.

4.12 -

Optional condensate pump

Check the sealing of the hydraulic connection of the

condensate pump and condensate recovery.

The meaning of the electrical wires is described below:

■ Brown - Blue wires : Electrical supply 230V 50/60Hz

■ Black - Grey wires : Alarm contact Normally Closed

(NC) 250V/8A maxi.

4 - COMPONENTS AND MAINTENANCE

Содержание Idrofan 42NH

Страница 1: ...Translation of the original document DUCTED FAN COIL UNITS 42NL 42NH INSTALLATION OPERATING AND M A I N T E N A N C E I N S T R U C T I O N S ...

Страница 2: ......

Страница 3: ...Installing the unit in the false ceiling 15 3 2 Installation procedure 15 3 3 Removal procedure 16 3 4 Safety considerations relating to final shut down 16 4 COMPONENTS AND MAINTENANCE 17 4 1 Fan motor assembly 17 4 2 Drain pan removal 18 4 3 Water coil 18 4 4 Duct connection spigots 18 4 5 Duct connection rectangular flanges 18 4 6 Optional filter and filter access 19 4 7 Fresh air controller 19 ...

Страница 4: ...2NH L size 4 1114 300 50 42NH L size 5 1314 300 50 42NH L size 6 1314 345 50 42NH L size 7 1614 345 50 B C A B A B 42NH L size 2 744 300 42NH L size 3 914 300 42NH L size 4 1114 300 42NH L size 5 1314 300 42NH L size 6 1314 345 42NH L size 7 1614 345 C A B 4 ...

Страница 5: ...A B 42NH L size 2 744 300 42NH L size 3 914 300 42NH L size 4 1114 300 42NH L size 5 1314 300 42NH L size 6 1314 345 42NH L size 7 1614 345 D A B E F G H I 0 5 5 ...

Страница 6: ... 0 5 0 5 9a 9b L 11a 11a K 10a 10b M 12b 12a N 13a 13a 6 ...

Страница 7: ...O Ø16 26 Ø16 4w v 2w v 2w v B 40 40 40 B B B G G G C C C C C H D I E J F F F F K 7 ...

Страница 8: ...R BAS 60 50 75 100 70 80 90 DOWN 17a 17b 17c Q 16a 16b 16c 16d P 15a 15b 15d 15c 15e 8 ...

Страница 9: ...S 18a 9 ...

Страница 10: ...4w v 9 Water outlet of 2w v 10 Water outlet of 2w v B 2w v Two way valve 2w v B Two way valve and balancing function 4w v Four way valve Three way valve with integral by pass Connections for two way valve with balancing function Size 2 and 3 3 4 diameter Size 4 and 5 1 diameter Connections for other valves and coils Size 2 3 4 and 5 1 2 diameter Size 6 and 7 3 4 diameter 15 Meaning of wires propor...

Страница 11: ...haracter may be present The copper aluminium coil or components inside the unit could suffer irreparable corrosion damage in their presence 1 1 4 Recommended coil water quality At installation handover and then periodically every year it is advised to analyse the water for bacteria detection of ferro bacteria H2S producing and sulphate reducing bacteria and chemicals in order to avoid problems due...

Страница 12: ... 60 or 50 Hz 1ph 60Hz not available for 42NH3_5 NOTE All performances data certified by Eurovent are based on 50Hz application Carrier doesn t ensure the same performances when the unit operates at 60Hz the RPM and power input of the fan motor are usually higher WARNING Failure to take proper account of the above advice and unauthorised modification of the electrical connections will render the Ca...

Страница 13: ...tic compatibility in residential commercial and light industrial areas They also comply with the low voltage directive If the product is supplied without a Carrier control device verification of EMC conformity is the responsibility of the installer 2 3 General installation conditions IMPORTANT The Carrier numeric controller power module or in general units fitted with controls loops must have an i...

Страница 14: ...4 Caution for the control of the unit IMPORTANT It is not permitted to connect several units to the same control device electronic NTC controller WTC controller or any other third party controller Carrier electronic Thermostat type A B for AC motors require additional accessory board to allow master slave function Carrier electronic Thermostat type C D for EC motors can be connected upto 10 units ...

Страница 15: ...ts need to be installed it may be advisable to produce a drilling template The method of fixing the threaded hangers not supplied by Carrier depends on the ceiling type maximum diameter of the threaded hangers is 10 mm Once the threaded hangers are fixed to the ceiling tighten the first nuts WARNING When moving the units do not use water pipes condensate drain pan valves or flexible pipes to lift ...

Страница 16: ...alled open the stop valves on the manifolds bleed and then pressurize the circuits To bleed the coils slightly loosen the bleed screws The installation can then be started NOTE Do not switch on the power until all connections are made and earthed 3 3 Removal procedure Switch off the unit power supply at the isolator provided for the purpose during installation isolator not supplied by Carrier Disc...

Страница 17: ...Disconnect the capacitor by withdrawing the flat spade connectors from the back of the capacitor Replacement of the capacitor assembly is by the reversal of the above procedure 4 1 3 Fan wiring For any modifications of the wiring harness refer to the fan wiring diagrams provided with the units With the optional electrical box three of the available five or six speeds of AC motor are connected maxi...

Страница 18: ... 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 ...

Страница 19: ...f the supply air flow delivered by the unit at minimum speed NOTE To operate correctly the constant fresh air flow controller requires a differential pressure in the range of 60 Pa to 210 Pa 4 7 2 Fresh air controller with variable air volume The unit can be equipped with a variable fresh air flow controller from 0 to 55 l s 0 to 200 m3 h This is connected to the numeric Carrier controller and can...

Страница 20: ...lable ON OFF actuator Not Standard Available Available Moduling 3p actua Not Standard Available Available Waterflow range 200 l h 600 l h 1200 l h 1600 l h MINI NA NA NA NA 0 2 NA NA NA NA 0 4 NA NA NA NA 0 5 30 100 NA NA 0 6 35 115 200 220 0 8 40 130 260 290 1 50 160 310 250 1 2 60 180 380 420 1 4 70 210 430 480 1 6 80 240 490 550 1 8 90 270 550 610 2 100 300 610 680 2 2 110 320 660 740 2 4 120 3...

Страница 21: ... to the valve body maximum torque 15 N m 4 8 5 Valve body replacement procedure Disconnect the power supply before carrying out any work on a unit Close the isolating valves on the manifolds 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 which is held in pl...

Страница 22: ... above 1400 W capacity All units delivered with an electrical box or a Carrier controller are always equipped with a relay if the capacity of the electrical heater is above 1400W WARNING In case of customer supplied controller it is the responsability of the installer to set up an additional protection relay corresponding to the electrical heater capacity 4 11 Optional water sensor A water tempera...

Страница 23: ......

Страница 24: ... 08 2022 Manufacturer Carrier S C S Rte de Thil 01120 Montluel France Supersedes order No X 00DCG000132000D 09 2017 Manufacturer reserves the right to change any product specifications without notice Printed in the European Union ...

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