HYDRONIC DUCTED FAN COIL UNITS 42NL & 42NH
■■ 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 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 flow
can be set and controlled on site.
-- Higher energy efficiency due to optimal waterflow and
maximized valve authority.
-- Enhanced comfort thanks to stable and precise
ambient temperature control.
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
flow 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 flow.
The dynamic balancing function maintains a constant
differential pressure over the control valve.
The control valve regulates the flow by means of a variable
orifice which is controlled by the actuator.
3 : ΔP
1
1a
M
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
flow embossed on valve body
-- Nominal size DN 20 for 1’’ valve
-- Nominal pressure: PN 16 bar
-- Minimum operating differential pressure = 20 kPa at
nominal flow.
As a secondary option, two pressure points can be added
to the valve body in order to measure precisely the waterflow
during the commissioning and the maintenance stages.
1b
AIR TREATMENT
2
Legend
1.
2.
3.
Two-way valve with balancing function
1a. Valve actuator for waterflow control
1b. Differential pressure controller & balancing feature
Fan-coil unit
Minimum operating pressure drop at nominal waterflow:
15 kPa for sizes 2 & 3
20 kPa for sizes 4 & 5
■■ Materials
-- Pipes: MEPD-based elastomer (modified ethylenepropylene-diene)
-- Braid: 304L stainless steel
-- Insulation: cellular foam rubber with M1 fire rating (9
mm thick, flexible water pipes).
C
A
R
R
I
E
R
2
0
1
6
/
2
0
1
7
■■ Characteristics
-- Minimum bend radius (insulated pipes): 106 mm
-- The flexible water pipes are designed for treated or
untreated water.
-- Maximum operating pressure: 16 bar
-- 1/2” female flat gas connections for sizes 2, 3, 4 and
5
-- 3/4” female flat gas connections for sizes 6 and 7
-- Length: 1 m.
655
CONTROLS
Valves and actuators (option)