Carrier 42NL series User manual

PRODUCT SELECTION DATA
Hydronic Ducted Fan Coil Units
42NL & 42NH
Modular Horizontal
ducted unit
Extremely quiet operation
Low Energy Consumption
 
installation
Improved comfort
 
CARRIER participates in the ECP programme for FC/FCP


 
Original instructions

2
The photograph on the front cover is for illustrative purposes only and is not part of any offer for sale or contract.
The manufacturer reserves the right to change the design at any moment without prior warning.
Contents
1 - FUNCTIONS AND CONFIGURATIONS............................................................................................................................ 3
1.1 - Modularity ................................................................................................................................................................................ 3
1.2 - Conguration exibility........................................................................................................................................................... 3
1.3 - Standard spigots conguration ............................................................................................................................................... 4
2 - DIMENSIONAL DRAWINGS................................................................................................................................................ 8
3 - MAIN MODULES AND COMPONENTS ......................................................................................................................... 11
3.1 - Casing ...................................................................................................................................................................................... 11
3.2 - Fan motors...............................................................................................................................................................................11
3.3 - Fan wiring solutions ............................................................................................................................................................... 11
3.4 - Water coil................................................................................................................................................................................. 12
3.5 - One-piece condensate drain pan .......................................................................................................................................... 12
3.6 - Filter......................................................................................................................................................................................... 12
4 - OPTIONS SPECIFICATIONS .............................................................................................................................................. 13
4.1 - Electric heater (option for 2-pipe coil)................................................................................................................................ 13
4.2 - Fresh air controller (option) ................................................................................................................................................. 13
4.3 - Valves and actuators (option) ............................................................................................................................................... 14
4.4 - Flexible water pipes (option)................................................................................................................................................ 16
4.5 - Sensors (option) ..................................................................................................................................................................... 16
4.6 - Condensate pump (option) ................................................................................................................................................... 16
5 - CONTROL (OPTION) ........................................................................................................................................................... 17
6 - PRODUCT CHARACTERISTICS LIST ............................................................................................................................ 18
7 - 42NH AND 42NL PERFORMANCE DATA...................................................................................................................... 20
7.1 - Physical and electrical data at Eurovent conditions - 42NL - Sizes 2 and 3.................................................................... 20
7.2 - Physical and electrical data at Eurovent conditions - 42NL - Size 4................................................................................ 21
7.3 - Physical and electrical data at Eurovent conditions - 42NL - Size 5................................................................................ 22
7.4 - Physical and electrical data at Eurovent conditions - 42NH - Sizes 2 and 3 ................................................................... 23
7.5 - Physical and electrical data at Eurovent conditions - 42NH - Size 4 ............................................................................... 24
7.6 - Physical and electrical data at Eurovent conditions - 42NH - Size 5 ............................................................................... 25
7.7 - Physical and electrical data at Eurovent conditions - 42NH - Sizes 6 and 7 ................................................................... 26
7.8 - Thermal capacities.................................................................................................................................................................. 27
7.9 - Sound power levels................................................................................................................................................................. 36
7.9 - Sound power levels (continued) ........................................................................................................................................... 37
7.10 - Electrical data....................................................................................................................................................................... 39
7.11 - Water coil pressure drop...................................................................................................................................................... 49
7.12 - Air ow data.......................................................................................................................................................................... 50
8 - OPERATING LIMITS ............................................................................................................................................................ 55
9 - SPECIFICATION GUIDE 42NL/42NH............................................................................................................................... 56
General description........................................................................................................................................................................ 56
Technical specication ................................................................................................................................................................... 56

3

• The Carrier 42NH and 42NL are available in different
sizes with 2-pipe, 2-pipe plus electric heater or 4-pipe
coils, with an air ow range from 100 to 2300 m3/h, a
total cooling capacity range from 0.6 kW to 12 kW
and a nominal heating capacity range from 0.8 kW to
17 kW.
• Compact and modular ducted unit, designed for any
false ceiling installation.
• Reliable and economical for tertiary building as hotel
guest rooms, ofces or light commercial applications.
• Low height of 235 mm (sizes 2/3/4/5) and 285 mm
(sizes 6/7)
• Compatible with the Carrier diffuser ranges.
• Extremely low sound levels for ducted applications.
• Five- to Six- speed fan AC motors offers a wide choice
of medium speeds.
• Available with Low Energy Consumption variable-
speed EC motor.
• High-pressure centrifugal fan for 42NH Range
• G1 lter as standard.
• Safe factory installed electric heater with multiple
capacity stages choices.
• Low water pressure drop with factory installed valves.
• Factory installed options (valves and controllers) for
fast and easy installation in false ceilings.
1.1 - Modularity
With its two versions, the range is able to address all
applications.
The 42NL version is optimised for simple soft
installations while the 42NH is optimised for air return
and supply ducted installations.
42NH
42NL

Each of the 42NL and 42NH sizes can be provided:
- With free inlet and/or outlet
- With a rectangular ange air inlet and/or outlet
(practical to connect the fan-coil unit to the air
ductwork).
- With inlet and/or outlet plenums including large
number of spigots diameters 160, 200 or 250 mm
according to unit size.
Below picture shows all available air distribution
congurations on 42NL or 42NH (size 3 for example) with
spigot diameter 200 mm.
Large Plenum
Compact Plenum
Rectangular Flange
Control (WTC; NTC; Electrical Box)
Coil & Drain pan
INLET OPTIONS BASIC UNIT OUTLET OPTIONS

4

Large and small plenums for inlet and outlet are available for all sizes according to the drawings below:
42NH & 42NL Size 2xx
42NH & 42NL Size 5xx
42NH & 42NL Size 3xx
42NH Size 6xx
42NH & 42NL Size 4xx
42NH Size 7xx
COMPACTCOMPACT 
INLET OR OUTLETINLET OR OUTLETINLET OR OUTLET INLET OR OUTLET
4x DN 160
3x DN 200
2x DN 160
1x DN 200

(2x160 and 1x200 for 42NH279)
 


(2x160 and 2x200 for 42NL range)

(4x160 and 3x200 for 42NL range)
6x DN 160
5x DN 200
4x DN 160
3x DN 200
4x DN 160
4x DN 200
2x DN 160
2x DN 200
5x DN 200
4x DN 250
3x DN 200
2x DN 250
5x DN 160
4x DN 200
3x DN 160
2x DN 200
6x DN 200
5x DN 250
4x DN 200
3x DN 250
LIMITS
LIMITS
(*)
(*)
(*) = Minimum number of spigots required to ensure sucient available static pressure and fan reliability

• Electrical heater are not available for 42NL Units when plenum are selected (due to minimum airow requirement)
• Non-standard congurations not listed above can be provided upon special request. Contact your local Carrier representative.

5


For enhanced compact design, a lateral fresh air
spigot can be added to the base unit (A)

INLET

OUTLET
BASE
UNIT

BASE
UNIT
BASE
UNIT
First extra lateral
spigot is placed
on the opposite
side of the coil

PLENUM (B)
(B) Large plenum is required to t the M5
lter
(C) Without any lter the small inlet plenum
is at for improved compacity.
COMPACT
PLENUM (C)
CONTROL
(same side as coil)
COIL
(left or right hand)
COMPACT
PLENUM

PLENUM


For enhanced compact design, a lateral fresh air spigot or
a regular spigot (160; 200; 250 mm) can be added (C)
In-line fresh air inlet
can be chosen for
compact plenum only
for sizes 2, 3 and 5.

coil side
Air ow direction
Fresh air inlet
(A) In this case, the air must be ltered
beforehand to prevent any damage to the
fan and the soiling of the coil.

6

Compatibility Reminder Size 2 Size 3 Sizes 4 to 7
22x / 23x 279
1x160 NH/NL n.a. n.a. n.a.
1x200 NH/NL NH NH n.a.
1x250 n.a n.a. n.a. n.a.
Compatibility Reminder Size 2 to 3 Size 4 Size 5 Size 6 Size 7
2x160 NH/NL n.a. n.a. n.a. n.a
2x200 NH/NL NH/NL NH n.a. n.a
2x250 n.a. n.a. n.a. NH n.a
n.a.: Not Available

U-shaped
U-shaped
T-shaped

PLENUM
ALL
FILTER

PLENUM
COMPACT
PLENUM

PLENUM


INLET

PLENUM

COMPACT
PLENUM
COMPACT
PLENUM


PLENUM
BASE UNIT
(Closed casing or
with an additional
Fresh air spigot)
COMPACT
PLENUM
FLAT
PLENUM

L-shaped
H-shaped or I-shaped
H-shaped or I-shaped


7

 

Lateral Fresh Air (opposite to coil hand)
Option 1 “Optimized” Option 2 “In_opp”
Lateral Fresh Air “In_coil” “In_line” Fresh Air (for sizes 2, 3 & 5)

PLENUM (D)
COMPACT
PLENUM

PLENUM
COMPACT PLENUM
OR
FLAT PLENUM


PLENUM
M5 FILTER
Fresh Air at left
or right side of a

(D) A large plenum at
the inlet side is
always needed in
order to t the M5
lter with a wider
frame.
Inlet optimized: For compact design, the fresh air is
tted in base unit (opposite to coil hand).
With this option, the fresh air position is opposite to coil hand
and always ts into a large plenum.

8

NOTE: All drawings shown have the coil connections on the right-hand side. Units with left-hand connections are
symmetrical.
Standard unit with free air inlet and outlet
Unit with rectangular anges at air inlet and outlet
Air ow direction
All dimensions are in mm.
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
A520 520 520 520 575 575
B330 330 330 330 385 385
C25 25 25 25 25 25
D235 235 235 235 285 285
E85 85 85 85 85 85
F17 17 17 17 25 25
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
G450 620 820 1020 1020 1320
H500 670 870 1070 1070 1370
J330 330 330 330 385 385
K230 230 230 230 230 230
G + K 680 850 1050 1250 1250 1550
Weight* [kg] 15 18 23 27 30 36
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
A615 615 615 615 670 670
B330 330 330 330 385 385
C103 103 103 103 103 103
D235 235 235 235 285 285
E85 85 85 85 85 85
Rectangular Flanges 380
x 160
550
x 160
750
x 160
950
x 160
950
x 210
1250
x 210
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
F17 17 17 17 25 25
A1 561 561 561 561 615 615
G450 620 820 1020 1020 1320
H500 670 870 1070 1070 1370
J330 330 330 330 385 385
K230 230 230 230 230 230
G + K 680 850 1050 1250 1250 1550
Weight* [kg] 15 18 23 27 30 36

1 Lateral optimized fresh air position in base unit (opposite to coil hand at inlet)
* Maximum weight 42NL/NH (AC or EC motor version) - without valve option - without water

9
Unit with G1 or G3 lter with compact plenum at air inlet and outlet
Unit without lter with compact plenum at air inlet and outlet (optimized lenght)
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
A 611 611 611 611 666 666
B330 330 330 330 385 385
C25 25 25 25 25 25
D235 235 235 235 285 285
E185 185 185 185 185 185
F17 17 17 17 25 25
G450 620 820 1020 1020 1320
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
H500 670 870 1070 1070 1370
J330 330 330 330 385 385
K230 230 230 230 230 230
L 63 63 63 63 76 76
M100 100 100 100 100 100
G + K 680 850 1050 1250 1250 1550
Weight* [kg] 19 23 29 33 37 44
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
A660 660 660 660 715 715
B330 330 330 330 385 385
C75 75 75 75 75 75
D235 235 235 235 285 285
E185 185 185 185 185 185
F17 17 17 17 25 25
G450 620 820 1020 1020 1320
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
H500 670 870 1070 1070 1370
J330 330 330 330 385 385
K230 230 230 230 230 230
L 63 63 63 63 76 76
M100 100 100 100 100 100
N50 50 50 50 50 50
G + K 680 850 1050 1250 1250 1550
Weight* [kg] 19 23 29 33 37 44

1 Lateral optimized fresh air position in base unit (opposite to coil hand at inlet)
2 In line fresh air position for compact plenum (with or without lter)
* Maximum weight 42NL/NH (AC or EC motor version) - without valve option - without water
Air ow direction
All dimensions are in mm.

10
Unit with G1, G3 or M5 lter with large plenum at air inlet and outlet
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
A1040 1040 1040 1040 1195 1195
B330 330 330 330 385 385
C305 305 305 305 355 355
D235 235 235 235 285 285
E 333 333 333 333 382 382
F17 17 17 17 25 25
G450 620 820 1020 1020 1320
Dimensions in mm
Size 2xx 3xx 4xx 5xx 6xx 7xx
H500 670 870 1070 1070 1370
J330 330 330 330 385 385
K230 230 230 230 230 230
L 63 63 63 63 76 76
M250 250 250 250 297 297
N280 280 280 280 330 330
G + K 680 850 1050 1250 1250 1550
Weight* [kg] 22 27 34 40 45 53

1 Lateral optimized fresh air position in base unit (opposite to coil hand at inlet)
3 Lateral fresh air position in large plenum (at inlet or outlet side)
* Maximum weight 42NL/NH (AC or EC motor version) - without valve option - without water
Air ow direction
All dimensions are in mm.

11
42NH and 42NL units are equipped with the variable-
speed LEC fan motor, that is controlled by a 0 to 10 V
signal, available with the Carrier NTC or WTC type
electronic control.
NOTE: In this case the minimum control signal that
allows motor start-up is 2 V for two- and four-pipe
versions and 3 V for the versions equipped with electric
heaters.
If the product is supplied without a Carrier control device,
verication of EMC conformity is the responsibility of the
installer.
3.3 - Fan wiring solutions
3.3.1 - Multi-speed unit with bare wires
As an option, all speeds of the multi-speed fan are
available with bare wires (six speeds for 42NL and ve
speeds for 42NH) offering the unit greater ow control
exibility.
Minimum speed = R6 or R5, maximum speed = R1.
3.3.2 - Multi-speed unit with optional controller or
electrical box (standard)
When ordering, three of the ve speeds must be selected
to allow connection of the fan motor in accordance wih the
applicable control (NTC, WTC or Electrical box for
Carrier Thermostats).
With the electrical box, the installer can connect the
unit to a terminal board. The electrical box can be opened
with a screw driver.
The electrical box permits changing the speed
wiring without access to the motor. All available speeds are
connected.
Wiring example: By default R5 R3 R1 are
connected on the terminal board.
Other 2 or 3 remaining speeds available,
easy access
NOTE: The standard wiring for all ranges of units is
always R5 R3 R1.
3.3.3 - Variable-speed low energy consumption (LEC) fan
motor option with bare wires
The variable-speed low energy consumption (LEC) fan
motor must be controlled by a 0-10 V d.c. signal.
3.3.4 - Variable-speed low energy consumption (LEC) fan
motor with electrical box (standard)
This option allows the installer to connect the unit to a
terminal board inside an electrical box. The electrical box
can be opened with a screw driver.
The 0-10 V d.c. signal that controls the variable fan speed
is directly accessible at the terminal board.

3.1 - Casing
In order to further enhance occupant comfort this product
range offers especially low noise levels. The casing is made
of galvanised sheet steel with full high-efciency internal
lining for optimised thermal and sound insulation of the
unit.
In order to comply with the various local regulations (re
class) the fan-coil unit is available with both class M1 type
insulation (according to NF P 92-507) and Euroclass level
B-s3-d0 (according to EN 13501). It is also equipped with
anti-vibration mounts as standard.
In order to reduce the dimensions to the minimum, the
units are equipped with high-efciency heat exchangers
with very high cooling capacity/treated air ow ratios. The
condensate drain pan height is optimised.
3.2 - Fan motors
3.2.1 - Multi-speed fan motor assembly compliant with
ErP 2015 regulation
Motor description
• Asynchronous motors, 4 poles with internal overload
protection
• Permanent capacitor
• Class B winding insulation, varnish class F
• See operating limits in chapter 8.
The 42NH and 42NL have a multi-speed fan motor
assembly with forward curved, double inlet, simple, double
or triple wheel fans according to the unit size.
Five speeds are available as standard for 42NH (Six speeds
for 42NL). Three speeds must be selected to allow connection
of the fan motor in accordance with applicable
electromechanical or electronic control.
• Minimum speed: R5 for 42NH; R6 for 42NL
• Maximum speed: R1
• Units can be supplied with Carrier electronic controls
and prewired to a selection of three speeds.
• For other fan motor Speed wiring combinaisons refer
to the unit options list (chapter 6).
3.2.2 - Low-consumption fan motor assembly (variable-
speed LEC)
Motor description
• Permanent magnet brushless motor
• Electronically commutated
• Class B winding insulation, varnish class F
• See operating limits in chapter 8.

12
3.3.5 - Cover only option
An accessory plastic cover can be provided for a control
supplied by the customer (max. dimensions L = 200 mm x
D = 100 mm x H = 95 mm) and is installed on site or at the
factory on a multi-speed unit or a variable-speed low
energy consumption (LEC) fan motor.
NOTE: This option is not compatible with the electrical
box option.
3.3.6 - Fuse holder option
A fuse holder can be provided as an option for all
controllers or with the electrical box.
3.4 - Water coil
• Aluminium ns mechanically bonded by expansion
onto copper tubes
• 1/2’’ threaded water inlet and outlet connections (female)
for sizes 2 to 5
• 3/4” threaded water inlet and outlet connections (female)
for sizes 6 and 7
• Air purge valves and drain are standard.
• Service pressure 1550 kPa.
The coil is integral with the drain pan and coil access door
to ease of removal during service and maintenance.
3.5 - One-piece condensate drain pan
Insulated drain pan with a 16 mm external drain
connection diameter and re rating M1 (according to
NFP 92-507).
3.6 - Filter
3.6.1 - Specications
The 42NH and 42NH include as standard a non
regenerable G1 lter according to EN 779.
A G3 lter and a pleated M5 lter (for range 42NH only)
according to EN 779 are also available. G3 and M5 lters
have medium re rating M1 (according to NFP 92-507)
and a metal frame.
The “without lter” option is only available for units with
a plenum or a rectangular ange at the air inlet side to
ensure that a ductwork will be connected when the unit
operates.
To prevent coil soiling, Carrier recommends the usage of a
lter either tted in the fan-coil unit or in return air grille.
42NH offers four lters congurations:
• Without lter: only available for units with an inlet
plenum with spigots or with a rectangular ange inlet
• G1 lter: supplied as standard
• G3 lter: metal wire frame, medium efciency
• M5 lter (only for 42NH): metal wire frame, high
efciency, thickness = 55 mm.
1
2
3
0
500
1000
1500
2000
2500
Airflow, m3/h
0
10
20
30
40
50
60
0.0 0.5 1.0 1.5 2.0
Pressure drop (Pa)
4
5
6
7
8
9
Air Velocity (m/s)
0.0 0.5 1.0 1.5 2.0
( )
*
Legend
1 M5 lter
2 G3 lter
3 G1 lter
4 Airow for 42NH/NL Size 2
5 Airow for 42NH/NL Size 3
6 Airow for 42NH/NL Size 4
7 Airow for 42NH/NL Size 5
8 Airow for 42NH/NL Size 6
9 Airow for 42NH/NL Size 7
(*) Example: The pressure drop of a G3 lter used in a 42NH645 is 25Pa for a
1600 m3/h airow.

13
3.6.2 - Filter access
Without rectangular ange inlet, the lter removal is from
the rear.
Filter
With rectangular ange inlet or plenums, the lter removal
is from below (trapdoor).
Filter
Filter

4.1 - Electric heater (option for 2-pipe coil)
Electric heater-resistance wire type
• Supply voltage: 230 V - 1 ph - 50 Hz
• Heater size and capacity per unit (+5% ; -10%):
Electrical
Heater
Capacity
Low Medium High Very High
42NH/NL 2-5 1 x 500 W 1 x 800 W 1 x 1000 W NA
42NH/NL 2-9 1 x 500 W 1 x 800 W 1 x 1000 W NA
42NH/NL 3-5 1 x 500 W 1 x 800 W 1 x 1000 W 1 x 1600 W
42NH/NL 3-9 1 x 500 W 1 x 800 W 1 x 1000 W 1 x 1600 W
42NH/NL 4-5 2 x 500 W 2 x 800 W 2 x 1000 W NA
42NH/NL 4-9 1 x 500 W 1 x 800 W 1 x 1000 W 1 x 1600 W
42NH/NL 5-5 2 x 500 W 2 x 800 W 2 x 1000 W NA
42NH/NL 5-9 2 x 500 W 2 x 800 W 2 x 1000 W NA
42NH 6-5 2 x 500 W 2 x 800 W 2 x 1000 W 2 x 1600 W
42NH 6-9 2 x 500 W 2 x 800 W 2 x 1000 W 2 x 1600 W
42NH 7-5 2 x 500 W 2 x 800 W 2 x 1000 W 2 x 1600 W
42NH 7-9 2 x 500 W 3 x 500 W 3 x 800 W 3 x 1000 W
• The heater is protected with a dual safety device:
a) Self-holding automatically reset integrated safety
thermostat
b) Destructive thermofuse link
• Available for 2-pipe coil only.
WARNING: Minimum air ow must be maintained to
avoid damaging the electric heaters.
A minimum control signal of 3V is selected by default
with Electronic Carrier controller (NTC / WTC). To
prevent low airow with 42NL range, plenum cannot be
chosen as an option.
4.2 - Fresh air controller (option)
4.2.1 - Constant volume fresh air controller
The fan coil can be tted with a constant fresh air ow
controller adjustable from 15 m3/h to 180 m3/h to allow
control of the introduction of fresh air and of the air
change rate.
The fresh air supply can be located in the air supply
plenum, in the air return plenum or in the side of the base
unit casing for compact design.

14
1
2
3
3/h
1 Air Damper
2 Fresh airow damper position setting (in m3/h)
3 Airow adjustment screw
The fresh air controller may be modied on site by
relocating the damper (adjustable screw). Three ranges of
air-controller are provided: 15 to 50m3/h, 60 to 100m3/h and
110 to 180m3/h.
IMPORTANT: If an optional return air temperature
sensor is provided, the constant fresh air ow rate must
not exceed 50% of the unit supply air ow rate at
minimum speed.
NOTE: To operate correctly,the fresh air ow controller
requires a differential pressure in the range of 60 Pa to
210 Pa.
4.2.2 - Variable volume fresh air controller
The unit can be equipped with an optional variable fresh
air ow controller from 0-55 l/s (0-200 m3/h). It is
connected to the numeric Carrier controller and can
regulate the fresh air intake in two ways:
• Either using a xed rate set by the installer that can
be recongured as required
• Or based on the CO2 level; in this case it is connected
to a CO2 sensor via the Carrier numeric controller.
NOTE: With the variable fresh air ow controller the
upstream pressure in the fresh air duct must be 180 Pa.
4.3 - Valves and actuators (option)
NOTE: The motor valve assembly is normally closed.
4.3.1 - Valve actuators
A wide choice of actuators is available with two or four-way
valve bodies (three-way with integral bypass) to offer the
right solution for any controller type and customer
requirement, from on/off to proportional types, with either
230 V or 24 V power supply:
• On/off 230 V actuator
• On/off 24 V actuator
• Floating 3-point 230 V actuator
• Floating 3-point 24 V actuator
• Modulating 0-10 V/24 V actuator
When combined with LEC motors and WTC or NTC
controllers, oating 3-point 230-V actuators are
recommended to increase energy savings and enhance
comfort.
NOTE: 24V power supply actuators are not compatible
with Carrier controllers (Thermostats A/B/C/D, WTC &
NTC).

15
4.3.3 - Two way balancing valve body
New two-way valves with embedded balancing function
technology are available as an option with 42NH and
42NL units. The Carrier two-way valve with balancing
function combines the functionality of a dynamic
balancing valve and a control valve in one product. They
are available as an option with Carrier NTC and WTC
controllers.
The dynamic balancing function maintains a constant
differential pressure over the control valve.
The control valve regulates the ow by means of a variable
orice which is controlled by the actuator.
M
1
2
1a
1b
3:DP
Legend
1. Two-way valve with balancing function
1a. Valve actuator for waterow control
1b. Dierential pressure controller & balancing feature
2. Fan-coil unit
3. Minimum operating pressure drop at nominal waterow:
15 kPa for sizes 2 & 3
20 kPa for sizes 4 & 5
The constant differential pressure across the control valve
ensures accurate control and maximizes valve authority,
independently of the pressure conditions in the system.
Advantages versus standard two-way valve
• Improved and reliable commissioning. The water ow
can be set and controlled on site.
• Higher energy efciency due to optimal waterow
and maximized valve authority.
• Enhanced comfort thanks to stable and precise
ambient temperature control.
4.3.2 - Standard two-way valve body and three-way valve
body (with integral bypass)
Features of the 1/2” two-way and three-way valves for
42NL/NH sizes 2 to 5
• 1/2” male BSP connection for union nuts
• Straight valve body with arrow indicating direction of
ow embossed on valve body
• Nominal size DN15 for 1/2’’ valve
• Nominal pressure: PN 16 bar
Features of the 3/4” two-way and three-way valves for
42NH sizes 6 and 7
• 3/4” male BSP connection for union nuts
• Straight valve body with arrow indicating direction of
ow embossed on valve body
• Nominal size DN20 for 3/4’’ valve
• Nominal pressure: PN 16 bar
0.01
0.1
1
10
100
100 1000 10000
3
24
1
Pressure drop (kPa)

Legend
1 1/2” - Modulating valve (3-points & 0-10V) 42NL/NH - Size 2 Kvs = 1
2 1/2” - Modulating valve (3-points & 0-10V) 42NL/NH - Sizes 3, 4, 5 Kvs = 1.6
3 3/4” - Modulating valve (3-points & 0-10V) 42NL/NH - Size 6 Kvs = 2.5
4 3/4” - Modulating valve (3-points & 0-10V) 42NL/NH - Size 7 Kvs = 4
Legend
1 1/2” - ON/OFF valve 42NL/NH - Size 2 Kvs = 1
2 1/2” - ON/OFF valve 42NL/NH - Sizes 3, 4, 5 Kvs = 1.7
3 3/4” - ON/OFF valve 42NL/NH - Size 6 Kvs = 2.8
4 3/4” - ON/OFF valve 42NL/NH - Size 7 Kvs = 4
0.01
0.1
1
10
100
100 1000 10000
3
24
1
(0,027) (0,27) (2,7)
Pressure drop (kPa)


16
Features of the 3/4” two-way valves with balancing
function for 42NL/NH sizes 2 and 3
• 3/4” male BSP connection for union nuts
• Straight valve body with arrow indicating direction of
ow embossed on valve body
• Nominal size DN 15 for 3/4’’ valve
• Nominal pressure: PN 16 bar
• Minimum operating differential pressure = 15 kPa at
nominal ow.
Features of the 1” two-way valves with balancing function
for 42NL/NH sizes 3 and 4
• 1” male BSP connection for union nuts
• Straight valve body with arrow indicating direction of
ow embossed on valve body
• Nominal size DN 20 for 1’’ valve
• Nominal pressure: PN 16 bar
• Minimum operating differential pressure = 20 kPa at
nominal ow.
As a secondary option, two pressure points can be added
to the valve body in order to measure precisely the
waterow during the commissioning and the maintenance
stages.
4.4 - Flexible water pipes (option)
4.4.1 - Materials
• Pipes: MEPD-based elastomer (modied ethylene-
propylene-diene)
• Braid: 304L stainless steel
• Insulation: cellular foam rubber with M1 re rating
(9 mm thick, exible water pipes).
4.4.2 - Characteristics
• Minimum bend radius (insulated pipes): 106 mm
• The exible water pipes are designed for treated or
untreated water.
• Maximum operating pressure: 16 bar
• 1/2” female at gas connections for sizes 2, 3, 4 and 5
• 3/4” female at gas connections for sizes 6 and 7
• Length: 1 m.
4.5 - Sensors (option)
4.5.1 - Water sensor
A water temperature sensor can be provided as an option
for NTC and WTC controllers.
• For 2-pipe coil: The sensor is installed on a cooling/
heating water pipe (for change-over function).
• For 4-pipe coil: The sensor is installed on a heating
water pipe (for cold-draft function that prevents the
operation of the unit when the heating network is off).
In case of fan-coil unit delivered with an electrical box, the
“water sensor” option is actually a switch that will be
connected to the Carrier thermostat.
NOTE:
• The water sensor option (switch) with electrical box is
only available for 2-pipe coil without electrical
heater.
• A water probe can also be provided as an accessory
only in order to use the cold draft function of the
thermostat.
4.5.2 - Air sensor
Two air sensors, factory tted, are available as an option
for NTC and WTC controllers. They measure the air
temperature at the inlet and/or at the outlet side.
4.5.3 - CO2sensor
For indoor air quality control, a CO2 sensor is available as
an option for NTC and WTC controllers. The sensor is
factory tted at the inlet side.
4.6 - Condensate pump (option)
The condensate pump option is designed to t on the side of
the unit drain pan. Electrical power supply 230V-50/60Hz.
Condensate pump discharge performances:

Total length of pipe (Ø int. 6 mm ) A
Discharge head (B) 5 m 10 m 20 m 30 m
0 m 20 19 18 17
2 m 16 15 14 13.5
4 m 11.5 11 10.5 10
6 m 8.5 7.5 6.5
8 m 654
10 m 43.5 2.5

17
Thermostats NTC WTC
Communication Protocols
Carrier Communication Network (CCN) Aquasmart compatible x
BACnet MSTP x
LON x
Control algorithms
On-o x
Proportional-integral x x
Carrier Energy saving algorithm x x
Fan control
AC motors 3 speeds descreet Type A&B x x
Automatic optimum fan speed selection x x x
EC motors 3 speeds descreet Type C&D x x
EC motors Variable speed x x
Water Valve management
Air ow control only (no water valve) x
230V On-o actuators x x x
230V Modulating actuators (oating 3pts) x x
Main functions
Setpoint control x x x
Occupied/unoccupied mode x x x
Frost protection mode x x x
Window / Door contact input xxx
Measurement of water inlet temperature for automatic seasonal changeover (2 pipes) Type A&C x x
Measurement of water inlet temperature to prevent cold-draft (4 pipes and 2 pipes + electric heater) Type B&D x x
Manual changeover xxx
Frost protection mode x x x
Continuous ventilation within dead-band xxx
Periodical ventilation within dead-band xxx
On-site conguration x x x
Unit grouping Master/Slave xxx
Cassette Louvers control x x
Supply air temperature monitoring limiting x x
Electrical heater loadshed x x
Dirty lter alarm x x
Alarm reporting x x
Indoor Air Quality control (CO2sensor) o o
Demand control ventilation (DCV) (0-10V fresh air valve) o o
Free cooling mode o
Presence detection o
User interfaces
Automatic or manual fan speed control x x x
Setpoint adjustment xxx
Occupancy (eco) button x x o
Digital display o o
Remote control (infra-red) o o
CO2sensor o o
Luminosity sensor o
Motion detection o
Easy connection RJ45 jack (on wall mounted UI) x
Light & Blinds management
Light power modules o
Blinds power modules o
Control kit
On site control kit solution o

The unit can be supplied with a wide range of Carrier
controls. These offer functions to suit the various
application requirements, summarised in the table below.
Legend
X Feature available as standard
O Optional
NOTE: For the features and specications of the Carrier
controllers refer to the technical documentation for each
controller.
Upon special request other controller types can be factory-
installed on the units (supplied by Carrier or the customer).

18

Characteristic Name Digit n°
 Value Description Pack. Compatibility
Range
1-2 42
3-4 NH
NL
UNIT SIZE (Digits 5 - 6 - 7)
Chassis size 5
2Chassis Size 2
Ye s
Unit size availability (Digit n° 5-6-7):
3Chassis Size 3
4Chassis Size 4 2-pipe: 4-pipe:
5Chassis Size 5 NL / NH 225;235;229;239;279
NL / NH 325;335;329;339
NL / NH 425;435;429;439
NL / NH 525;535;529;539
NH 635;645;639;649
NH 735;745;739;749
NL / NH 235;239;279
NL / NH 335;339
NL / NH 435;439
NL / NH 535;545;539;549
NH 645;649
NH 735;745;739;749
6Chassis Size 6
7Chassis Size 7
 6
2Standard eciency
Ye s
3Medium eciency
4High eciency
7Extra High eciency
Fan type 7 5AC multispeed motor Ye s
9EC low consumption motor
Coil hand & type 8
F2 pipes coil Left Hand
Ye s
2 pipes coil Right Hand
C4 pipes coil Left Hand
D4 pipes coil Right Hand
Control 9
-Bare wires
Ye s Valves and actuators must be selected with NTC
EElectrical Box
KNTC
LWTC LON
MWTC BACNET
Valve body 10
-Without valve Ye s
Balancing valves are not available for unit sizes 6xx and 7xx
2-way valve Ye s
H4-way valve Ye s
L2-way balancing valve No
T2-way balancing valve and pressure
points No
Electrical heater 11
-Without electric heater
Ye s
Electrical heaters are not compatible with 42NL with
plenum.
E500W electric heater
F800W electric heater
1000W electric heater Highest capacity for unit size 2xx
H1500W electric heater
J1600W electric heater Highest capacity for unit sizes 3xx and 4x9
K2000W electric heater Highest capacity for unit sizes 4x5 and 5xx
L2400W electric heater
M3000W electric heater Highest capacity for unit sizes 7x9
N3200W electric heater Highest capacity for unit sizes 6xx and 7x5
Valve actuator 12
-Without actuator Ye s
24V actuators are not available with Carrier controllers
3 points oating actuators are not available with Electrical
Box
A230V ON/OFF actuator Ye s
C230V oating actuator (3 points) No
B24V ON/OFF actuator Ye s
D24V oating actuator (3 points) No
E24V 0-10V modulating actuator No
Rectangular
 13
-Without rectangular ange Ye s
AOutlet rectangular ange only Ye s
BInlet rectangular ange only Ye s
CInlet and outlet rectangular anges Ye s

(options
selection)
14
-Without specic option Ye s
AWith specic options (factory tted) Ye s

Default value for mandatory characteristic
Pack: Available with individual packaging

19

Specic options (can be selected if digit n°14 = A*)
Characteristic Name Value Description Pack. Compatibility
Indoor air quality
Without Filter Ye s Only available with rect. anges or plenum
G1 Ye s
G3 Ye s
M5 No M5 lter only available for 42NH units with plenum
Fan speed wiring for AC
motor
654 AC motor speeds arrangement:
R6 = minimum speed for 42NL
R5 = minimum speed for 42NH
R1 = maximum speed
When this option is not selected, the standard wiring
for all 42NL and 42NH units is always R5-R3-R1 Ye s R6 not available for 42NH range
653
652
651
643
642
641
632
631
621
543
542
541
532
531
521
432
431
421
321
Packaging Bundle Filmed on a pallet (shrink wrap) -
Individual Individual packaging
Inlet plenum
1_inline 1 spigot in line
No According to unit sizes, lter and fresh air position
Use selection software for more informations
1_lat_op 1 lateral spigot opposite to coil side
1_lat 1 lateral spigot at coil side
2 2 spigots
2_lat 2 lateral spigots
3 3 spigots
4 4 spigots
5 5 spigots
6 6 spigots
7 7 spigots
Outlet plenum
1_inline 1 spigot in line
No According to unit sizes, lter and fresh air position
Use selection software for more informations
1_lat_op 1 lateral spigot opposite to coil side
1_lat 1 lateral spigot at coil side
2 2 spigots
2_lat 2 lateral spigots
3 3 spigots
4 4 spigots
5 5 spigots
6 6 spigots
Inlet spigots diameter
DN160 Spigot diameter
No
DN160 Not available for unit sizes 6xx to 7xx
DN200
DN250 DN250 Not available for unit sizes 2xx to 5xx
Outlet spigots diameter
DN160 Spigot diameter
No
DN160 Not available for unit sizes 6xx to 7xx
DN200
DN250 DN250 Not available for unit sizes 2xx to 5xx
Fresh air
DN125 Without controller - spigot only
No
Motorized air damper compatible with NTC and WTC
only (Position feedback is not available if WTC and CO2
sensor are also selected)
DN125_15_50 15 to 50 m3/h controller
DN125_50_100 50 to 100 m3/h controller
DN125_100_180 100 to 180 m3/h controller
Adaptor_D125 For motorized air damper
(to be ordered separately)
Fresh air position
In_opp At inlet side opposite to coil hand
No According to unit sizes, lter and spigots selection
Use selection software for more informations
In_coil At inlet side same as coil hand
In_line At inlet rear side
Optimized Inlet optimized: opposite to coil hand in base unit for
compact design
Out_opp At outlet side opposite to coil hand
Out_coil At outlet side same as coil hand
Fuse holder boolean Fuse holder Ye s
Plastic cover boolean Plastic cover Ye s For bare wires (without control only)
Condensate pump boolean Condensate pump No
Flexible boolean Flexible hoses No
Return air sensor boolean Return air temperature sensor Ye s Compatible with NTC and WTC only
Supply air sensor boolean Supply air temperature sensor Ye s Compatible with NTC and WTC only
Water temperature sensor boolean Water temperature sensor Ye s According to controller and coil type
CO2sensor boolean CO2sensor Ye s Compatible with NTC and WTC only

Default value for mandatory characteristic
Pack: Available with individual packaging
* If Digit n°14 = “-” then default values are selected.
Boolean: yes or no

20
With G1 lter - without plenum
42NL 225 235 229 239
Fan speed R6 R5 R4 R3 R2 R1 R6 R5 R4 R3 R2 R1 2V 4V 6V 10V 2V 5V 7V 10V
(Eurovent certication speeds) (L) (M) (H) (Max) (L) (M) (H) (Max) (L) (M) (H) (Max) (L) (M) (H) (Max)
Air ow l/s 59 69 96 109 125 138 59 69 96 109 125 138 43 58 73 102 43 65 81 102
m3/h 214 248 346 393 449 497 214 248 346 393 449 497 153 210 261 368 153 234 292 368
Available static pressure Pa 00000000000000000000
Cooling mode, two pipes*
Total cooling capacity kW 1.20 1.36 1.77 1.93 2.10 2.22 1.39 1.58 2.09 2.31 2.53 2.71 0.89 1.18 1.42 1.85 1.02 1.50 1.82 2.19
Sensible cooling capacity kW 0.96 1.10 1.45 1.60 1.76 1.88 1.06 1.22 1.64 1.82 2.03 2.19 0.71 0.95 1.15 1.52 0.77 1.15 1.41 1.73
Water ow rate l/s 0.06 0.06 0.08 0.09 0.10 0.11 0.07 0.08 0.10 0.11 0.12 0.13 0.04 0.06 0.07 0.09 0.05 0.07 0.09 0.11
l/h 210 230 300 330 360 380 240 270 360 400 440 470 150 200 240 320 170 260 310 380
Water pressure drop kPa 15 19 31 36 41 45 11 15 26 30 35 40 815 21 33 6 13 20 28
Water content l 0.4 0.5 0.4 0.5
Heating mode, two pipes**
Heating capacity kW 1.69 1.92 2.51 2.76 3.03 3.23 1.86 2.13 2.85 3.16 3.51 3.78 1.25 1.66 2.01 2.64 1.36 2.02 2.46 3.00
Cooling mode, four pipes*
NA NA
Total cooling capacity kW 1.05 1.19 1.56 1.71 1.87 1.99 0.78 1.14 1.37 1.63
Sensible cooling capacity kW 0.90 1.02 1.35 1.49 1.65 1.77 0.66 0.97 1.18 1.42
Water ow rate l/s 0.05 0.06 0.08 0.08 0.09 0.09 0.04 0.06 0.07 0.08
l/h 180 210 270 290 320 340 130 200 240 280
Water pressure drop kPa 4 6 10 11 14 15 25 7 10
Water content l 0.3 0.3
Heating mode, four pipes***
NA NA
Heating capacity kW 1.87 2.11 2.70 2.94 3.17 3.34 1.40 2.02 2.40 2.82
Water ow rate l/s 0.04 0.05 0.07 0.07 0.08 0.08 0.03 0.05 0.06 0.07
l/h 160 190 240 260 280 290 120 180 210 250
Water pressure drop kPa 56 9 11 12 13 3 5 7 10
Water content l 0.2 0.2
Electric heater 230V ±10% - 1ph 230V ±10% - 1ph 230V ±10% - 1ph 230V ±10% - 1ph
Maximum capacity W 1000 1000 1000 1000
Current drawn A4.6 4.6 4.6 4.6
Sound levels
Sound power level (global) dB(A) 38 41 48 51 54 57 38 41 48 51 54 57 32 37 39 48 32 38 41 48
Electrical data, motor
Power input W 28 31 45 54 65 80 28 31 45 54 65 80 35713 3 59 13
Current drawn A0.14 0.17 0.20 0.23 0.28 0.35 0.14 0.17 0.20 0.23 0.28 0.35 0.05 0.06 0.08 0.14 0.05 0.06 0.10 0.14
FCEER [energy class] - 2 pipes 43 [ E ] 50 [ E ] 264 [ A ] 309 [ A ]
FCCOP [energy class] 60 [ E ] 67 [ E ] 376 [ A ] 416 [ A ]
FCEER [energy class] - 4 pipes 32 [ E ] 235 [ A ]
FCCOP [energy class] 67 [ E ] 422 [ A ]
42NL 325 335 329 339
Fan speed R6 R5 R4 R3 R2 R1 R6 R5 R4 R3 R2 R1 2V 4V 6V 10V 2V 4V 6V 10V
(Eurovent certication speeds) (L) (M) (H) (Max) (L) (M) (H) (Max) (L) (M) (H) (Max) (L) (M) (H) (Max)
Air ow l/s 84 94 124 144 154 168 84 94 124 144 154 168 55 88 120 165 55 88 120 165
m3/h 302 338 447 517 555 606 302 338 447 517 555 606 198 318 431 594 198 318 431 594
Available static pressure Pa 00000000000000000000
Cooling mode, two pipes*
Total cooling capacity kW 1.47 1.60 1.97 2.19 2.29 2.43 1.80 1.99 2.54 2.88 3.04 3.26 1.06 1.53 1.92 2.40 1.22 1.89 2.46 3.22
Sensible cooling capacity kW 1.25 1.37 1.71 1.92 2.03 2.16 1.42 1.58 2.04 2.32 2.47 2.66 0.88 1.31 1.67 2.13 0.96 1.50 1.97 2.62
Water ow rate l/s 0.07 0.08 0.09 0.11 0.11 0.12 0.09 0.09 0.12 0.14 0.14 0.16 0.05 0.07 0.09 0.11 0.06 0.09 0.12 0.15
l/h 250 280 340 380 390 420 310 340 440 490 520 560 180 260 330 410 210 320 420 550
Water pressure drop kPa 10 11 17 20 22 25 11 13 21 27 29 33 5 10 16 24 512 20 32
Water content l 0.7 0.9 0.7 0.9
Heating mode, two pipes**
Heating capacity kW 2.25 2.46 3.04 3.36 3.51 3.71 2.60 2.89 3.68 4.14 4.37 4.67 1.58 2.35 2.95 3.67 1.76 2.73 3.56 4.61
Cooling mode, four pipes*
NA NA
Total cooling capacity kW 1.79 1.96 2.42 2.68 2.82 2.99 1.27 1.87 2.36 2.95
Sensible cooling capacity kW 1.41 1.55 1.95 2.18 2.30 2.46 0.98 1.47 1.89 2.43
Water ow rate l/s 0.09 0.09 0.12 0.13 0.13 0.14 0.06 0.09 0.11 0.14
l/h 310 340 420 460 480 510 220 320 400 510
Water pressure drop kPa 15 18 26 31 34 37 8 16 25 37
Water content l 0.6 0.598
Heating mode, four pipes***
NA NA
Heating capacity kW 2.78 3.03 3.66 3.98 4.13 4.32 1.95 2.90 3.58 4.27
Water ow rate l/s 0.07 0.08 0.09 0.10 0.10 0.11 0.05 0.07 0.09 0.11
l/h 240 270 320 350 360 380 170 250 310 380
Water pressure drop kPa 12 14 20 23 25 27 7 13 19 26
Water content l 0.3 0.3
Electric heater 230V ±10% - 1ph 230V ±10% - 1ph 230V ±10% - 1ph 230V ±10% - 1ph
Maximum capacity W 1600 1600 1600 1600
Current drawn A7.3 7.3 7.3 7.3
Sound levels
Sound power level (global) dB(A) 43 46 54 57 59 61 43 46 54 57 59 61 37 46 53 61 37 46 53 61
Electrical data, motor
Power input W 38 45 62 74 86 99 38 45 62 74 86 99 4 10 20 49 4 10 20 49
Current drawn A0.16 0.20 0.27 0.32 0.37 0.44 0.16 0.20 0.27 0.32 0.37 0.44 0.06 0.10 0.17 0.39 0.06 0.10 0.17 0.39
FCEER [energy class] - 2 pipes 37 [ E ] 46 [ E ] 188 [ A ] 225 [ A ]
FCCOP [energy class] 57 [ E ] 67 [ E ] 292 [ A ] 332 [ A ]
FCEER [energy class] - 4 pipes 36 [ E ] 228 [ A ]
FCCOP [energy class] 70 [ D ] 360 [ A ]

Eurovent certied values
* Eurovent conditions: Entering air temperature = 27°C db/47% rh – entering water temperature = 7°C, water temperature dierence = 5 K.
** Eurovent conditions: Entering air temperature = 20°C, entering water temperature = 50°C, same water ow rate as in cooling.
*** Eurovent conditions: Entering air temperature = 20°C, entering water temperature = 70°C, water temperature dierence = 10 K.
7.1 - Physical and electrical data at Eurovent conditions - 42NL - Sizes 2 and 3
