Carrier 42NL Original Instructions Manual

Also see for 42NH series: Installation, operation and maintenance instructions Installation, operation and maintenance instructions

Contents

Carrier 42NL Original Instructions Manual Manual pdf 16 page image

16Features of the 3/4” two-way valves with balancingfunction for 42NL/NH sizes 2 and 3• 3/4” male BSP connection for union nuts• Straight valve body with arrow indicating direction offlow embossed on valve body• Nominal size DN 15 for 3/4’’ valve• Nominal pressure: PN 16 bar• Minimum operating differential pressure = 15 kPa atnominal flow.Features of the 1” two-way valves with balancing functionfor 42NL/NH sizes 3 and 4• 1” male BSP connection for union nuts• Straight valve body with arrow indicating direction offlow embossed on valve body• Nominal size DN 20 for 1’’ valve• Nominal pressure: PN 16 bar• Minimum operating differential pressure = 20 kPa atnominal flow.As a secondary option, two pressure points can be addedto the valve body in order to measure precisely thewaterflow during the commissioning and the maintenancestages.4.4 - Flexible water pipes (option)4.4.1 - Materials• Pipes: MEPD-based elastomer (modified ethylene-propylene-diene)• Braid: 304L stainless steel• Insulation: cellular foam rubber with M1 fire rating(9 mm thick, flexible water pipes).4.4.2 - Characteristics• Minimum bend radius (insulated pipes): 106 mm• The flexible water pipes are designed for treated oruntreated 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.4.5 - Sensors (option)4.5.1 - Water sensorA water temperature sensor can be provided as an optionfor 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 heatingwater pipe (for cold-draft function that prevents theoperation 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 beconnected to the Carrier thermostat.NOTE:• The water sensor option (switch) with electrical box isonly available for 2-pipe coil without electricalheater.• A water probe can also be provided as an accessoryonly in order to use the cold draft function of thethermostat.4.5.2 - Air sensorTwo air sensors, factory fitted, are available as an optionfor NTC and WTC controllers. They measure the airtemperature at the inlet and/or at the outlet side.4.5.3 - CO2 sensorFor indoor air quality control, a CO2 sensor is available asan option for NTC and WTC controllers. The sensor isfactory fitted at the inlet side.4.6 - Condensate pump (option)The condensate pump option is designed to fit on the side ofthe unit drain pan. Electrical power supply 230V-50/60Hz.Condensate pump discharge performances:TABLE OF ACTUAL DISCHARGE (l/h)Total length of pipe (Ø int. 6 mm ) ADischarge head (B) 5 m 10 m 20 m 30 m0 m 20 19 18 172 m 16 15 14 13.54 m 11.5 11 10.5 106 m 8.5 7.5 6.58 m 6 5 410 m 4 3.5 2.5