Mark Fan Coil Technical Manual

Introduction

This technical manual provides detailed information for the Mark Fan Coil unit, distributed by Puravent. It covers identification, receiving, safety guidelines, operating limits, installation, hydraulic and electrical connections, maintenance, and troubleshooting.

Index of Contents

• Identification of the Appliance
• Receiving the Appliance
• General Warnings
• General Indications
• Mandatory Safety Rules During Installation
• Mandatory Safety Rules During Use, Maintenance, Repair
• Operating Limits
• Waste Disposal
• Technical Characteristics of the Fan Motor
• Electric Heaters
• Mechanical Installation
• Hydraulic Connections
• Drain Pan Discharge: General Note
• Electrical Connections General Rules
• Motor Wiring
• Start-up Procedures
• Filter
• Condensate Drain Pan
• Heat Exchanging Coil
• Troubleshooting

Identification of the Appliance

Each unit is identified with a label located inside the unit on the electrical control side. This label displays the manufacturer's data and the unit type.

Receiving the Appliance

Inspect each unit thoroughly before acceptance. Ensure the packaging is not damaged, bent, or broken. If a package is damaged, open it immediately and check the contents. Verify the chassis, panels, heat exchanging coil, condensate drain pan, filters, fan rotation, and any accessories. Do not refuse shipment if damage is found; instead, document all damages on the shipping document and take pictures.

General Warnings

This manual must always accompany the appliance. After unpacking, confirm there are no damages and the appliance matches your order. For significant damage, describe it on the carrier's shipping documents, take pictures, send a letter to the carrier immediately, and provide a copy to your dealer and/or manufacturer, including the model and serial number.

General Indications

A 230V single-phase electric connection and a hydraulic connection to a water chiller/boiler are required for proper operation. The unit is designed for heating and/or cooling of occupied rooms. All units are factory-tested before delivery. Repairs and maintenance must be performed by qualified specialists. Failure to follow manual instructions or unauthorized modifications can lead to dangerous situations and will invalidate the warranty. The manufacturer is not liable for damages caused by unauthorized changes, improper installation, or improper use.

Mandatory Safety Rules During Installation

Do not install the Fan Coil:

• Outdoors
• In excessively humid environments
• In explosive or corrosive environments
• In very dusty environments

A bipolar safety switch, properly sized and easily accessible, must be installed to disconnect the appliance from the power supply (minimum 3 mm contact distance). The appliance must be properly earthed. ⚠️ Do not place flammable or dusty goods near the appliance. ⚠️ Do not remove internal labels.

Mandatory Safety Rules During Use, Maintenance, Repair

It is dangerous to:

• Touch the Fan Coil with wet body parts or bare feet.
• Modify safety device settings.
• Spray water or flammable liquids/gas onto the Fan Coil.
• Introduce foreign objects or hands through air intake/discharge grills or into fans.
• Bend, pull, or detach electric wires, even when disconnected from power.

Before any maintenance or repair:

• Disconnect electrical power and secure it in a disconnected position.
• Close water valves.
• Wait until water temperature is safe (not too hot or too cold).

If the Fan Coil is installed in very cold climates and will be inoperative for a long period, the hydraulic circuit must be completely emptied to prevent ice damage. If an external air damper is installed, cold air can cause ice formation and tube breakage. In such cases, mix glycol with the water in the hydraulic circuit. Coils are tested up to 3000 kPa (30 bar). Ensure the air filter is refitted correctly before restarting the unit after cleaning or replacement.

Operating Limits

• Electric power supply: 230V/1/50Hz or 400V/3/50Hz ±6%
• Minimum cooling water temperature (without glycol): 5°C
• Maximum heating fluid temperature: 120°C
• Maximum allowed operating pressure: 24 bar
• Working pressure: 10 bar

For installations where temperatures can drop below 0°C, add glycol to the water according to the table provided. Ethylene glycol protects the circuit from freezing. The table shows the percentage of glycol needed for specific freezing temperatures. Water-glycol mixtures have varying mass and viscosity, affecting Fan Coil capacity. Glycol also acts as a corrosion inhibitor; its concentration should be checked at least annually.

Diagram Description: A line graph showing Temperature (°C) on the Y-axis (from -80°C to 20°C) and G-energy antifreeze SNF concentration (% in vol.) on the X-axis (from 0% to 100%). A specific point is marked at -23°C on the Y-axis, corresponding to approximately 40% concentration on the X-axis.

Waste Disposal

Packaging, consumables, and replaced parts must be disposed of according to local safety and environmental protection laws.

Technical Characteristics of the Fan Motor Minimum Cross Section of the Electric Supply Wires

Data in the table are valid only for the fan motor and do not include accessories like valves or electric heaters.

• Wire cross-sections shown are minimum requirements for connections up to 10m long, max current load of 5 A/mm², for copper wires, and only for the fan motor.
• Voltage drop between operating and non-operating states must be below 3%; larger wires are needed if the drop exceeds 3%.
• Minimum wire cross-section is 1.5 mm².

Electric Heaters V230/1/50-60Hz

Tube: INOX AISI 304L – Fins: Fe/AlZn – Rules: DPR 547/55 – CENELEC EN60 – IEC 335.1 – CEI 61-50

Mechanical Installation

Choose an installation area that allows proper air circulation (incoming and outgoing). Avoid placing curtains or objects that obstruct the air outlet and return. Ensure adequate clearance around the unit for maintenance and cleaning. The Fan Coil must be mounted level to ensure proper operation and drainage. Use the supporting feet or hanging rods for leveling, checking on the unit casing. Do not use the coil or drain pan for leveling. Employ shock absorber supports to prevent noise and vibration transmission through walls and air ducts. Do not install where water dripping inside the appliance is possible. Ensure electrical and hydraulic connections are on opposite sides of the appliance before installation.

Hydraulic Connections

Proper hydraulic connections and water circulation ensure good operation, longevity, and limited energy consumption. Piping must be properly sized (diameter) and insulated to prevent condensate dripping and heat dissipation. Typically, the water inlet is at the bottom of the coil, and the outlet is at the top. If space is limited, valves may necessitate reversing the inlet/outlet positions. Allowed materials for condensate drain piping include PVC or steel. Use tape sealant to prevent leaks after connecting piping. Before installation, ensure the water circuit is filtered, free from scale or iron oxides. Water may require chemical treatment to prevent scale, corrosion, algae, or sludge. When connecting the heat exchanging coil, use two spanners and avoid damaging copper tubes. Fit two gate valves on the water circuit (inlet and outlet). Motorized water valves need adequate space for removal and must not be mounted upside down. For condensate drain piping, create a drain trap, ensure a minimum slope of 50 mm/m, avoid counterslopes, do not kink the pipe, and check the connection. After connecting, pour water into the drain pan to check the circuit. Perform hydrostatic pressure tests and air vent the coil, ensuring no dripping occurs. Avoid circuit checks just before holidays.

Drain Pan Discharge: General Note

A siphon must be installed on the drain line to prevent the fan from sucking obnoxious odors or bacteria from the drain system, which could lead to the proliferation of pathogenic germs and microorganisms, including "Legionella Pneumophila". A missing or incorrectly installed siphon can cause air to be sucked into the unit, prevent condensate drainage, and lead to flooding. The siphon must not be hermetically connected to the drain line to allow air locks to break. A siphon under positive pressure should not be connected to one under negative pressure. The drain line downstream of the siphon must have sufficient slope for condensate removal and be at least the same diameter as the unit drain connection. Drain piping can be steel, copper, or PVC. Improperly supported drain lines may deform, create air locks, and hinder drainage. Insulating the siphon and drain line helps prevent external condensation. Antifreeze should be added in winter. Beware of siphon water evaporation during shutdown periods; ensure siphons are always full. An inspection plug should be fitted in an accessible position. The condensate drain pan should be cleaned periodically to prevent scale, algae, and encrustations.

Drain in Positive Pressure:

Diagram Description: A schematic showing a U-shaped pipe (siphon) with labels T, p, S, H. The formulas provided are: T = 2p, S = T/2, H = T - S. Example: P = 400Pa = 40 mmwc. Calculated values: T = 80 mm, S = 40 mm, H = 40 mm.

Drain in Negative Pressure:

Diagram Description: Similar schematic to positive pressure, but with a negative pressure indication. The formulas provided are: T = -2p, S = T/2, H = T - S. Example: P = -250Pa = -25 mmwc. Calculated values: T = 50 mm, S = 25 mm, H = 25 mm.

Electrical Connections General Rules

Electrical connections must be made by qualified personnel only, adhering to local electrical and safety codes. A bipolar safety switch, properly sized and easily accessible, must be installed to disconnect power (minimum 3 mm contact distance). All connections must comply with local codes. The Fan Coil must be properly earthed before any other electrical connection. Refer to the unit's wiring diagram for wiring and installation details. Accessories not described in this manual require separate power supplies, protected by switches and fuses. Ensure the voltage is within the allowed limits (refer to "Operating Limits" and "Technical Characteristics"). The upstream electrical circuit must be adequately sized for the Fan Coil's current draw and other connected devices. Minimum wire cross-section is 1.5 mm². Auxiliary circuits (switches, controls, interlocks) require a minimum 1.5 mm² cross-section. Wire selection should limit current to 5 A/mm² and voltage drop to 3% between operating and non-operating states.

Motor Wiring

The Fan Coil features a terminal block on the internal side panel opposite the hydraulic connections. This block is ready for connection to a fan speed selector switch or thermostats, which are supplied as accessories. Connection details are shown in the accessory installation instructions. Ensure terminal screws are tightened securely after wire insertion to guarantee good electrical contact. Improperly tightened terminals can cause serious danger and fire risk.

Start-up Procedures

For installation or after any maintenance, perform the following checks before starting the unit:

• ✔️ Water pressure inside operating limits
• ✔️ Adequate cross section of electrical wires
• ✔️ Electrical connections completed and tightened
• ✔️ Power supply voltage inside the operating limits
• ✔️ Duct connections completed (ducted units only)
• ✔️ Filter is free of construction debris
• ✔️ Air return flow is free of obstacles and obstructions
• ✔️ Air delivery flow is free of obstacles and obstructions
• ✔️ Fan rotates freely
• ✔️ Condensate drain pan free of construction debris
• ✔️ Drain lines clean and operating
• ✔️ Drain lines with proper slope, without counterslope and restrictions
• ✔️ Condensate drain water evacuates properly
• ✔️ Adequate cross section of water pipes
• ✔️ Piping connections completed
• ✔️ Air vent completed

Filter

The air filter removes foreign matter like dirt, soot, and pollen to prevent damage to the Fan Coil. It should be replaced annually, or more frequently in dusty environments. A dirty filter impairs efficiency by restricting airflow and can encourage bacterial growth. To clean the filter: remove it, vacuum it, or replace it if too dirty. Always refit the filter correctly after cleaning.

Condensate Drain Pan

Check the condensate drain pan before the cooling season. The pan and discharge hole can clog with scale; use appropriate chemical products for cleaning. Dirt accumulation may impair condensate evacuation, leading to water leakage. To clean: remove the pan, clean with fresh water, dry carefully, and refit.

Heat Exchanging Coil

If the air filter is clean, the coil requires no maintenance. Use a vacuum cleaner for light cleaning. For heavy dirt, use a stiff nylon brush between fins, being careful not to damage them. For persistent dirt or odors, consult a specialized technician for fan and fan motor cleaning and maintenance. Fan motors are permanently lubricated and require no lubrication. Annually, remove dust and dirt from the scroll and ensure the fan is securely fixed and balanced. Fan motors do not require maintenance.

Troubleshooting

The motor does not rotate at all, or does not rotate properly

• No electrical power to the Fan Coil.
• Electrical connections are incorrect or do not match wiring diagrams.
• Fan speed selector switch (if installed) is in the wrong position.
• Seasonal changeover switch (if installed) is in the wrong position.
• Thermostat setting (if installed) is incorrect.

The Fan Coil does not cool / heat properly

• No water flow to the Fan Coil.
• Filter is dirty or clogged.
• Heat exchanging coil is dirty or clogged.
• Air in the water circuit.
• Fan is not rotating or rotating improperly.

Water comes out from the unit

• Heat exchanging coil is broken.
• Leakages from hydraulic connections.
• Condensate drain pan is dirty or discharge hole is clogged.
• Condensate piping has an incorrect slope or insufficient slope.
• Condensate piping is clogged.

Wiring Diagram: PS_FLE: Brushless EC motor 0-100%

Diagram Description: A simplified wiring diagram showing connections for a Brushless EC motor. It includes inputs for SIGNAL (0-10Vdc, PWM), BY CUSTOMER, NEUTRAL, EARTH, and power supply (120V-240V). Components like FILTER BOX and CONTROL BOARD are indicated.

Manufacturer and Distributor Information

This technical data is not binding. The manufacturer reserves the right to introduce modifications for product improvement.

Mark Branches:

• MARK BV (Netherlands) - www.mark.nl
• MARK EIRE BV (Ireland) - www.markeire.com
• MARK BELGIUM b.v.b.a. (Belgium) - www.markbelgium.be
• MARK DEUTSCHLAND GmbH (Germany) - www.mark.de
• MARK POLSKA Sp. z o.o (Poland) - www.markpolska.pl
• S.C. MARK ROMANIA S.R.L. (Romania) - www.markromania.ro

Distributor:

Puravent
Adremit Limited, Unit 5a, Commercial Yard,
Settle, North Yorkshire, BD24 9RH
Call: 0845 6880112
Email: info@adremit.co.uk

Various certifications are displayed, including CE, EUROVENT CERTIFIED PERFORMANCE, ISO 9001, and others.