Other information and instruction manual for Minib convectors

Minib convectors are supplied as standard in lengths of 0.9 to 3m. It is possible to produce other lengths to order. Non-standard convectors longer than 3m (i.e. a 6m unit) can be assembled from two 3m units connected with a single 6m walkway grille. Minib can also produce curved convectors and convectors joined at various angles.

Technical data

• Voltage – 12V via safety isolating transformer (except electric heaters Coil-TE – 230V)
• Electrical input power – 5 to 130VA according to the length and number of fans
• Applications – dry and wet interiors depending on the specification
• Heat exchanger – Al fin/Cu tube construction – fins 0.25mm and 0.32mm thick – Cu tube diameter 15mm, working pressure 0.6 Mpa, test pressure 10 MPa
• Protection – provided by low safe voltage 12V. Motor protection IP2X where “ X ” indicates protection by low safe voltage 12V
• Working pressure – 6 bar permanently in the heat exchanger (0.6 MPa), outlet load tests made with the pressure 15 bar (1.5 Mpa), maximum load of connecting stainless steel hoses is 1.0 MPa
• Heating medium – water; maximum permitted inlet temperature of heating water is 90°C
• Environment for applications - interiors with temperatures from +5°C to +40°C

Convector mounting

For correct operation it is necessary to comply with the following general principles:

• Install so that the heat exchanger is on the side of the unit furthest from the window or wall.
• Always connect the heat exchanger to the flow and return piping using the stainless steel hoses (if not recommended otherwise), control valve and shut-off valve supplied with the unit. Connections can be made straight out or at right angles to the heat exchanger.
• Convectors must be installed horizontally with the upper edges of the trough unbuckled. This will ensure proper seating of the walkway grille and proper venting of the heat exchanger
• Convectors with an ornamental edge cover strip should be installed on the level with the floor covering +/-1mm
• Leave the protective top cover on the convector while performing any concrete work so as to prevent debris falling inside.
  Note that this protective cover cannot be walked upon!
• When pouring concrete ensure that the convector is secured to the floor using clamping bolts in order to prevent any vertical movement. It is also possible to vertically load the con vector during concrete pouring.

I. Installation of convectors into prepared floors

Dimensions of the existing trench should be as follows: trench depth = convector height + 10 to 15mm, trench width = convector width +20 mm

Installation procedure I.:

• set the convector in position by means of vertical adjusting bolts
• bolt the convector into the floor using the brackets and bolts

II. Installation of convectors prior to concreting the floor

Installation procedure II.:

• Concrete the space below the convector so that the finished total height of the fitted convector equals the final floor height +/-1mm
• Set the convector in position by means of the vertical setting bolts
• Bolt the convector into the floor using the outer brackets and bolts

Finishing of installation I and II:

• Connect piping and wiring
• Check height, levelness, assembly braces and installation of ornamental cover strip. The walkway grille can be laid in as a check
• Fit the protective cover over the convector and load and secure the convector to prevent shifting
• Fix and provide noise insulation by pouring a thin layer of concrete around and under the convector
• Embed the convector directly in concrete to achieve the optimum noise elimination
• When the convector is installed into the free space in a wooden floor without using concrete, it necessary to provide the convector body with special noise insulation (for additional charge)
• Lay the floor covering (tiles, carpet)
• Clean the space between the cover strip and the floor covering with silicone. When you install the convector into a wooden floor, it is recommended to fill the space between the convector and the floor with cork dilatation tape
• The floor convector must be solidly embeded in concrete. Adjusting bolts are used only for horizontal levelling of the convector trough. The convector must not stand on these bolts without being embedded in concrete

Installation of convectors in wet areas

This refers to KO, PO, KO-2, MO and HC type units designed with a drain outlet. Proceed in accordance with the instructions I or II above as well as connecting the drain tube at the bottom of the trough to an inclined drain line.

Mounting of non-standard convectors greater than 3m long

Convectors supplied in more than one section should be installed as above while paying special attention to the alignment of each. Such units are equipped with connecting plates, M4 inserts and M4x12mm screws to join the sections. It is recommended that the continuous walkway grille is laid down to check the alignment before proceeding with the concrete fill. Further proceed according to assembly instructions I or II listed above.

Installation of wall mounted and self-standing convectors

• Measure the total height of the convector
• Remove the ornamental cover panels, mark and drill holes in the wall
• Screw the back plate c/w fan and heat exchanger to the wall
• Connect water and electrical services
• Place the ornamental cover panels over the installed unit

Control of hot water convectors

Control is possible in two ways

1. Water side control for convectors with or without fans
   The convector’s output can be controlled by regulating either the temperature or flowrate of the water supplied to it. This can be achieved by either regulating the boiler temperature or using a thermostatic valve. The capillary sensor of the thermostatic valve should be positioned in a suitable position within the heated space. This type of control is recommended for convectors without fans.
2. Air side control for convectors fitted with fans.
   It is recommended that convectors fitted with fans are controlled on the air side by switching the fan on and off. When the fan is switched on the output of the convector will increase, by approximately 200%. A thermostat placed in a representative position within the space is used to switch the fan on and off. Detailed descriptions of possible standard and “IQ” control systems are given earlier in the catalogue or on internet site regulations of the company MINIB s.r.o.

Electrical installation and input cable dimensioning

I. Convectors installed in dry areas – fans with with 12V DC motors

• The two wire input cable CYKY to the convectors should be sized for currents of 10A at 12V regarding the voltage drop
• Connecting cables for a branch of convectors to one transformer should be CYKY 2x2.5mm2, connecting cable to individual convectors should be CYKY 2x1.5mm2
• If only one convector is connected to the transformer TT1-DC, use the cable CYKY 2x1.5mm2
• To determine the maximum length of convector that can be connected to the power supplies (e.g. TT1-DC), calculate using a consumption value of 7W per one metre of convector. TT1-DC = 96VA and the length is approx. 13 m. TT3 = 240 VA – ap prox. 32 m, TT5 = 330VA – approx. 47m
• The TTx-DC transformer in its installation box should be mounted in the wall or switchboard as close as possible to the convectors so as to prevent high voltage drops. Maximum allowable voltage drop is 1 to 2V
• Dimensions of the installation box with transformers TT1-DC are 145 x 175 x 70 mm
• Important: – Layout and installation of convectors fitted with fans must meet the relevant standards for safe positioning of all devices (TT1-DC, thermostat etc.).

II. Convectors installed in wet areas – fans with 12V AC motors

• The two wire input cable CYKY to the convectors should be sized for currents up to 27 A at 12V regarding the voltage drop (TT5).
• Connecting cables for a branch of convectors to one transformer should be CYKY 2x4mm2, Connecting cable to individual convectors should be CYKY 2x2.5mm2
• If only one convector is connected to the transformer then the cable should be CYKY 2x2.5mm2
• If DC motors for wet areas are used (shaft sealing), you must calculate with the input power of approx. 14W, and maximum lengths of convectors to be connected to one power supply are half the length of DC motors. When convectors with AC motors are used, calculate with a consumption of approx. 50 VA per metre of convector.
• The TT1, TT3 or TT5 transformer in its installation box should be mounted in the wall or switchboard as close as possible to the con vectors so as to prevent high voltage drops. Maximum allowable voltage drop is 1 to 2V.
• Installation box sizes are as follows: TT1 145mm x 175mm x 70mm, TT3 165mm x 210mm x 70mm, TT5 205mm x 255mm x 70mm.
• Important – Layout and installation of convectors fitted with fans must meet the relevant standards for safe positioning of all devices (transformer, thermostat etc.), on which there is no safe voltage and outside swimming pool zones 0,1 and 2.
• Convectors for wet areas i.e. type KO, MO, KO-2, COIL-HC equipped with a 12V fan and condense drain are developed and approved for use in zone 1 of wet areas.

The layout of electrical installation must be made by a project designer with relevant qualification and must be in line with relevant standards (the list of relevant standards is listed in the detailed assembly instruction manual). Installation of electrical devices must be undertaken only by qualified personnel trained according to local standards and regulations with respect to the project documentation and instructions laid down in this manual.
Make no other wiring connections at the convectors as these are protected by the low voltage supply from the transformer. In wet areas ensure that all drainage lines are non-conducting and perform all safety checks under local regulations before putting into service.

Warranty

All Minib s.r.o. products are certified and carry a warranty. The manufacturer provides for a two year warranty on all the parts of the convectors, additionally a ten year warranty is provided for the MINIB heat exchanger and against rusting-through of the stainless steel trough. The warranty does not cover damage caused by incorrect handling or abnormal use. The warranty is only valid assuming that the stainless steel flexible hoses supplied with the convectors are used. The standard aluminium or wooden grille is designed for loads of up to 120kg. For more extreme point loads or highly exposed areas it is recommended that the more durable stainless steel grille is used (available at an extra cost).

Minib s.r.o. guarantees that all convectors and parts thereof are tested, functional and free of defects before leaving the factory.