HYDRONIC DUCTED FAN COIL UNITS
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.
42NL & 42NH
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. 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.
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.
Legend 1. 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
Valves and actuators (option)
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). 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.