General Description

The Duct Fan Coil is designed to meet and exceed the demanding requirements for efficiency and quiet operation.

Structure

The structure is made from heavy gauge galvanized steel panels with couplings for the connection of ducting and a gravity drain pan with insulation for condensation. Fire resistant insulation is optional for internal case to provide both thermal and acoustic insulation. Insulation is also fitted on the top of coil.

Condensate Pans

Positive sloped drain pans are steel with powder finish, coated with self-extinguishing closed cell expanded polyethylene with thermal properties. The drain pan outlet is 3/4” (standard on the same side of coil connections).

Coils

Constructed with seamless copper tubes and headers. The tubes are mechanically expanded into corrugated aluminum fin material for a permanent primary to secondary surface bond. Coils are tested at 25 bar (363 psi) and recommended for operating at 8 bar (116 psi). Coils include manual air vent and water purge valves.

Fan Wheels

Housings are double inlet forward curved centrifugal type. Wheels are statically and dynamically balanced for smooth, quiet operation. The housing is constructed from heavy gauge galvanized steel with die-formed inlet cones.

EC motor

The unit is using EC motor include driven controls PCB, a constant torque, permanent magnet, brushless DC motor with preliminary 3-speed setting that allow for precise air balancing. The driven PCB need cooperate with thermostat.

Air filter

It is easily removable and washable and is made from self-extinguishing acrylic with an efficiency of class EU2 (G2) (Merv 2-4). G4 (Merv 8) efficiency is optional.

Flexible Function Control (iFCU-EC-W3 type)—A 230VAC signal from the thermostat which working power is from L and N or from indoor room to terminal H/M/L supplies power to the blower motor. Alarm interlock relay for unit failure notification is constructed. Normally open or normally closed contacts are available for field connection.

Complete Function Control (iFCU-EC-S3 type)

The main design features include:
~ 2-pipe,2-pipewithboosterelectricheat,2-pipewithprimaryelectricheat,4-pipewith6wayvalveinstalled. ~ Cool,Heat,Auto,DehumidifierandFanmodes.
~ Sleep,Auto-Fan,DailyTimer,Auto-Restartwithmemoryfunctions.
~ Userfriendlyremotecontrolhandset.
~ Heatandcooltemperatureprotectionsandsafetycutout.
~ 2-wayand3-wayon/offormodulatingvalvecontrol.
~ Wiredwallpadcontroller(optional)
~ Manualcontrolpanelincabinet.
~ Auxiliaryswitchforcoolingandheatingsignal.
~ Occupancy(remoteon/off)contacts/economymodecontacts.
~ OpenModbuscommunicationprotocol.

Variable water flow system

The water flow through the fan coil is controlled by a temperature difference between the flow and return pipework – referredtoas Δt,toensurethecorrectheattransferfromthewatertotheair.Constant Δtkeeptheunitrunningefficiency and consequently the whole life running costs of the system.