Myson LO-LINE RC 6-4, LO-LINE RC 9-6, LO-LINE RC 14-10, LO-LINE RC 19-15 Maintance Manual

MYSON Eastern Avenue, Team Valley, Gateshead, Tyne & Wear NE11 0PG, UK

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T: 0845 402 3434, F: 0191 491 7568, [e-mail], www.myson.co.uk

heatingthroughinnovation.

After Sales Service:

RETTIG (U K) L td ., Service, Somerden Road, Hull, East Yorkshire HU9 5PE
Tel [phone], Fax [phone], [e-mail]

Spare parts and technical help on all Convector products are available from Myson Service.

01.09.2007 ISSUE 1

Installation, Operating, Maintenance

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and After Sales Manual.

LO-LINE RC & LO-LINE RC Heater-cooler
Models: 6-4, 9-6, 14-10, 19-15

heatingthroughinnova tion.

Product Serial Number:

Please leave this manual with the end user.

Part Number: 1370057
Issue 1

Contents

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1.0 Gener al Infor mati on 03

2.0 Heati ng Syste m Design 03

3.0 Unit Selectio n/Sizing 03

4.0 Locat ion 03

5.0 Preparation 04

6.0 Fixin g 04

7.0 Water Co nnectio ns 05

8.0 Elect rical Connections 06

9.0 Commissioning Proce dure 07

10.0 Technical Data 08

11.0 Opera ting Ins tructions 09

12.0 Trou bleshooting 10

13.0 Maint enance 11

1.0 General Information

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LO-LINE RC & LO-LINE RC Heater Cooler

03

G This MYSON LO-LINE fan convector is designed for wall

mounted installation with a minimum installation height of
150mm to the underside of the unit.

G The LO-LINE should only be used on closed circulation, two

pipe, pump assisted central heating systems (LO-LINE) or
heating and cooling systems (LO-LINE Heater-Cooler).

G The LO-LINE Heater and Heater-Cooler can be used on heat

pump systems.

G Before proceeding with the installation, the heating system

design must be considered and the unit correctly sized to
meet the heat loss requirements of the room at normal fan
speed.

G This unit is supplied with an infra red remote control system,

giving automatic temperature control. Alternatively, the unit
can be run in manual, which allows manual switching between
the 3 fan speeds available to circulate ambient air.

This unit MUST NOT be installed in a bathroom or other similar high humidity area.

2.0 Heating System Design

This fan convector must be fitted on a two pipe, pumped
circulation heating system.

For optimum fan convector heating performance the system
must be capable of providing sufficient hot water through the
heat exchanger. This means that:

1. The minimum pipe size from boiler to fan convector must be
at least 15mm.

2. This unit is not suitable for use on microbore pipe-work.

3. Where the unit is fitted on to a system with other emitters a
separate circuit for the fan convector should be considered
to provide adequate water flow.

4. The system water must be above 43°C for heating mode.

5. For heat pump applications - see Commissioning Procedure

6. This unit is NOT suitable for one-pipe systems.

7. Optimum performance will require effective balancing of
the whole system.

8. This unit must not be used to replace a radiator in an
existing system unless an adequate flow of water through
the unit can be guaranteed.

1.02.0

3.0

4.0

3.0 Unit Selection/Sizing

Heat output performance is given in the Technical Data section
of this manual. Outputs are shown for the three fan speeds,
however, it is important to size the unit to match the calculated
heat loss requirements of the room with the unit operating on

4.0 Location

G This LO-LINE unit may be fitted to any convenient wall at a

height from floor level that suits the application, providing an
unimpeded flow of warm air into the area to be heated.

G The minimum distance from the underside of the unit to floor

level is 150mm.

the low fan speed. The higher fan speeds are used in automatic
mode when the room temperature is significantly lower than the
preset temperature.

G The unit should be mounted on a flat wall, and stud or

partition walls should be avoided to minimise the possibility
of noise transmission.

G For cooling applications, the need for disposal of condensate

may influence the position of the unit.

04

62 58 150

Min.
each
side

150 Min.

107

385

70

263

A

C

B

Cover Fixing Screws

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LO-LINE RC & LO-LINE RC Heater Cooler

5.0 Preparation

Before proceeding with the installation, unpack the carton
contents and check against the checklist below:

1. LO-LINE or LO-LINE Heater-Cooler unit.

2. 15mm isolating valves (1 pair).

3. Instruction manual.

4. Warranty card.

5. Fixing kit (rubber mounts and cable gland).

6. Remote control handset.

6.0 Fixing

G Using the fixing dimensions (see fig. 1), mark the fixing hole

positions on the wall.

G Drill and plug the wall for No. 8 x 40mm round head wood

screws ensuring that the wall plugs are suitable for the wall
type.

G Remove the backing from the self-adhesive washers and place

on screws with adhesive side towards the point.

Fig. 1

G Tighten the screws into the wall leaving about 9mm

projecting.

G Press adhesive washers to the wall.

Dimensions (mm)

Unit ABC

6-4 523 404 359

9-6 645 526 481

14-1 0 854 733 681

19-1 5 1138 1018 974

Remove the outer casing as follows:

G Remove the 2 screws from the underside of the unit (see fig. 2).

G Lift off the outer case.

G Fit chassis on to mounting screws and tighten.

Fig. 2

7.0 Water Connections

57

99

68

191

72

99

57

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LO-LINE RC & LO-LINE RC Heater Cooler

05

G Connect unit to system flow and return pipes using the two

15mm isolating valves (see fig. 3).

Note: To ensure effective venting of the heat exchanger the flow
pipe should be connected to the bottom connection of the heat
exchanger.

Note: For LO-LINE installations pipe-work must not be routed
directly underneath the unit as this will adversely affect the
operation of the integral room thermostat. If this cannot be

avoided, the pipe-work must be boxed to prevent heat rise.

G Ensure system is flushed in accordance with recognised best

practice and a suitable inhibitor is added to the system as
necessary.

G Open valves fully, check pipe connections for leaks and vent

the heat exchanger - see Commissioning Procedure.

LO-LINE Heater-Cooler installations with chilled water will
require provision for condensate disposal in accordance with any
local regulations.

A drain tray is fitted for condensate collection within the unit.
This should be connected to a 15mm drain pipe.

Note: External pipe-work carrying chilled water must be
insulated. Use a suitable sealant as necessary to ensure that
condensate does not spill or leak. Once connection to the
system flow and return pipes is made, any exposed internal
15mm pipework and isolating valves must be insulated.

5.06.0

Fig. 3

7.0

06

O O

LN

Motor

Power Board

Control Board

Air Sensor

Water Sensor

O O

Brown
Blue
White
Yellow

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LO-LINE RC & LO-LINE RC Heater Cooler

8.0 Electrical Connection

WARNING: This appliance must be earthed. The electrical installation must comply with local or national
wiring regulations.

G This unit is supplied with factory fitted test leads. Remove

these and discard.

G A fused electrical spur with a maximum 3A fuse and a switch

having 3mm separation on all poles must be provided in an
easily accessible position adjacent to the unit.

G Electrical cable entry to the unit should be made through the

underside of the unit using the cable gland provided, or
through the hole provided at the upper right hand corner of
the chassis.

Wiring Diagram

G Connect live and neutral wires to the power board terminal

connections, and the earth wire to the chassis earth terminal.

9.0 Commissioning Procedure

Dipswitches

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LO-LINE RC & LO-LINE RC Heater Cooler

07

G Fill and vent the system.

G Open both valves fully and vent air from the heat exchanger

by unscrewing the air bleed valve situated above the valves in
the angled top of the chassis.

G Check for leaks at pipe connections.

G Refit the outer case and secure using the 2 fixing screws.

Heat Pump Applications - Low Water Set Point
Adjustment Heating Mode

The low limit water set point is factory set to 43°C, but for
systems such as those with heat pumps, a lower water set point
may be required. The set point can be adjusted using the set
point switch located on the control board.

G Isolate electrical supply.

G Remove outer cover.

G Change switch position (see fig. 4)

G Refit cover.

G Switch on electrical supply.

G Switch on electrical supply.

G Check the operation of the unit in automatic and manual

modes (LO-LINE) or heating and cooling modes (LO-LINE
Heater-Cooler) by following the operating instructions.

G When installation and commissioning are complete, hand over

instruction manual to end-user.

Displayed Temperature Calibration

This function enables calibration of the displayed temperature
to the actual room temperature using the following procedure:

G Press the ‘On/Off’ key and ‘+’ key for 5 seconds (the display

will flash, alternating between ‘ro’ and the calibration
temperature.

G Calibrate the displayed room temperature by using the

‘+’ and ‘-’ keys.

G Press the ‘On/Off’ key to finish

Fig. 4

8.09.0

Switch Switch Down Switch Up

1 Water Stat Set Point 32°C 43°C

2 Heating / Cooling Heating & Cooling Heating

3 Not Used

4 Temperature Display °F °C

08

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LO-LINE RC & LO-LINE RC Heater Cooler

10.0 Technical Data

Heating Performance Data

Model Fan Speed

40° 45° 50° 55° 60° 65° 72° 81° 90° 99° 108° 117°

Boost

19-15

14-10

9-6

6-4

Tested in accordance with BS 4856 Part 1.
Flow rate 340 ltr/h (75 gal/h).

Flow Rate Correction Factors:
455 ltr/h (100 gal/h) multiply by 1.06.
227 ltr/h (50 gal/h) multiply by 0.96.
113 ltr/h (25 gal/h) multiply by 0.85.

Medium

Low

Boost

Medium

Low

Boost

Medium

Low

Boost

Medium

Low

3751 4197 4640 5081 5520 5957

3351 3748 4144 4538 4930 5321

2921 3268 3613 3956 4298 4639

2803 3136 3467 3796 4125 4451

2367 2648 2928 3206 3483 3759

1922 2150 2377 2603 2828 3052

1811 2026 2240 2453 2665 2875

1437 1608 1777 1945 2114 2282

1098 1228 1357 1486 1617 1743

1162 1300 1437 1574 1710 1845

843 943 1043 1142 1240 1339

741 829 916 1003 1090 1176

Cooling Performance Data

Heat Output watts

Temperature Difference °C

12803 14323 15836 17340 18839 20331

11436 12783 14144 15488 16826 18159

9970 11154 12331 13503 14670 15832

9567 10703 11833 12957 14077 15192

8080 9039 9993 10943 11889 12831

6559 7338 8113 8884 9652 10416

6182 6916 7645 8372 9096 9816

4904 5486 6066 6642 7216 7788

3748 4191 4633 5073 5519 5948

3965 4436 4905 5371 5836 6297

2877 3218 3558 3896 4233 4568

2528 2829 3127 3424 3720 4015

Heat Output Btu/h

Temperature Difference °F

Approximate Hydraulic Resistance through Fan Convectors

Litres/h

455
340
227
113

6 - 4

910
514
235

47

mm wg

9 - 6

998
520
121

97

14 -10

1240

719
324

75

19 -15

1670

954
469

77

6 - 4

8.98

5.06

2.35

0.45

9 - 6

9.85

5.10

1.18

0.97

kPa

14 -10

12.20

7.00

3.20

0.75

19 -15

16.40

9.40

4.60

0.82

Cooling Performance watts

Model Fan Speed

Air-Mean Water Temperature Difference °C

15° 20° 25° 27° 36° 45°

Tot. Sens. Tot. Sens. Tot. Sens.

Boost

19-15

14-10

9-6

6-4

Tested in accordance with BS 4856 Part 1. Flow rate 340 ltr/h. Relative humidity 50%.

Medium

Low

Boost

Medium

Low

Boost

Medium

Low

Boost

Medium

Low

Noise Levels

Model

19-15

14-10

9-6

6-4

Low Medium Boost

1533 1305 2291 1656 3128 1725

1464 1203 2187 1511 2987 1632

1340 1104 2002 1345 2734 1452

1228 1052 1835 1347 2505 1427

1032 878 1542 1113 2106 1159

877 754 1310 969 1788 1034

710 581 1061 770 1448 957

600 507 896 639 1223 655

499 423 745 535 1018 553

496 397 741 526 1012 654

391 335 585 429 798 454

321 277 480 357 655 383

Sound Pressures at 2.5m (dBA)

Weight, Water Content and Motor Power

Model

19-15 80 0.3 7.7

14-10 62 0.32 9.1

9-6 35 0.56 12.7

6-4 35 0.75 15.7

Test Pressure 20bar (2MPa) Maximum Working Pressure 10bar
Water connections 15mm Electrical supply 230V - 50Hz

Cooling Performance Btu/h

Air-Mean Water Temperature Difference °F

Tot. Sens. Tot. Sens. Tot. Sens.

5231 4453 7817 5650 10673 5886

4995 4105 7462 5156 10192 5568

4572 3767 6831 4589 9328 4954

4190 3589 6261 4596 8547 4869

3521 2996 5261 3798 7186 3955

2992 2573 4470 3306 6101 3528

2423 1982 3620 2627 4941 3265

2047 1730 3057 2180 4173 2235

1703 1443 2542 1825 3473 1887

1692 1355 2528 1795 3453 2231

1334 1143 1996 1464 2723 1549

1095 945 1638 1218 2235 1307

Motor

Power (W)

Water

Content (l)

Unpacked

Weight (kg)

11.0 Operating Instructions

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LO-LINE RC & LO-LINE RC Heater Cooler

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Description

This LO-LINE unit is fitted with a control system that provides
either automatic or manual control of the unit. In automatic
mode the desired temperature set point is selected and the unit
will adjust the fan speed according to the difference between
the actual room temperature and the set point. When the room
temperature reaches the set point the fan will switch off and
thereafter will continue to cycle on and off to maintain the room
temperature. The temperature set point range is 15 - 35°C.

In manual mode any of the three fan speeds can be selected by
overriding the automatic temperature control. This means that
air circulation can be provided in summer for example, or that
heating performance can be controlled manually.

The unit can be controlled using the infra red remote control
handset supplied with the unit (see fig.5) and also using the
control panel on the unit (see fig. 6). If necessary, however, the
control panel can be locked electronically to prevent tampering
once the controls have been set (see below).

Fig. 5 Fig. 6

The remote control hand set takes 2 AAA batteries (not supplied).

Controls Display

Power button Switches unit on & off

‘+/-’ button Adjust temperature set point from

15 - 35°C
Scrolls into F1, F2 or F3 manual mode

Heating

Heating will only be provided when the central heating
boiler is on, the pump is running and the system water
temperature is greater than 43°C. Ensure the boiler is on,
and set timer, boiler controls and room thermostats as
necessary.

10.011.0

10

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LO-LINE RC & LO-LINE RC Heater Cooler

11.0 Operating Instructions (c ont inued ... )

Operation Display

Power off No Display

Switch on supply to unit for 30 seconds
(unit off)

Supply on / unit off

Switch on unit Set point flashes for

5 secs, then

Ambient temperature
displayed

Use ‘+/-’ to adjust Set point flashes for
set point 5 secs, then

Ambient temperature

Manual

Manual mode can be used for air circulation without heat.

Use ‘+’ to scroll Selected fan speed
beyond 35°C displayed
Or use ‘-’ to scroll
below 15°C

Scrolling back out of manual using the ‘+’ or ‘–’ button will revert
the unit back to last temperature set point.

Cooling Mode

G Close the heating system and isolate any other heat emitters.

G Open the cooling water system.

G Ensure cooling is on, and set cooling unit timer and controls

as necessary.

Cooling operation works in exactly the same way as heating.
Follow the procedure above to set the unit controls.

The ambient temperature is always displayed unless the water
temperature falls below 43°C*, or if the set point is being
adjusted.

Water temp <43°C Shows both power

& unit on

*43°C i n normal heating system, 32°C for heat pumps and above 20°C in cooling.

12.0 Troubleshooting

Once installed this fan convector becomes part of a complete
heating system that will generally include a boiler, pump, other
emitters such as radiators and fan convectors, and a number of
heating controls, dependent on system complexity. An apparent
problem with this unit may be the result of system controls being
incorrectly set and can be solved easily without calling out your
installer or MYSON Service. Before calling your installer or
MYSON Service, please carry out the checks listed opposite.

Locking Unit Controls

The control panel on the main unit can be locked electronically
to prevent interference once the controls have been set. After
setting the unit to the desired temperature setting and with the
unit in running mode, press the On/Off button on the main unit
for about 6 seconds until the two middle horizontal bars appear
on the display. The horizontal bars will disappear after about 6
seconds and the unit is in key lock mode.

If any of the unit controls are pressed the horizontal bars will
reappear to show the key lock mode is activated, however,
during this mode the handset controls remain functional.

To unlock the system press the On/Off button for about 6
seconds until the horizontal bars disappear.

Note: If you call out MYSON Service to a fault detailed opposite,
or to repair a fault caused by incorrect use, a call out charge will
be made.

12.0 Troubleshooting (conti nued...)

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LO-LINE RC & LO-LINE RC Heater Cooler

11

Problem Remedy

Possible Causes

Unit switched off

Increase temperature set point

Switch on at spur

Heating Mode -

No Fan

Temperature set point reached

Unit not switched on at fused spur

Fuse blown at fused spur

Unit isolating valves shut

Water temperature reaching fan

convector below 43°C

Programmer ON

(Heater model only)

Boiler ON and set to high with central

heating pump running

Heating Mode

(Heater Model only)

poor heating

performance and/or

Note: Operation of fan convector can be checked by

Low water temperature to unit Turn up boiler thermostat

Poor water flow Vent air from heating system

switching to manual fan setting

unit cycles on

water sensor

Turn on

Replace fuse

Open valves

Check boiler -

If the fan convector is still faulty after checking the above, call your installer or MYSON Service.

Common Installation Faults

For optimum performance, this unit must be correctly sized to
match the heat loss requirements of the space it is required to

Problem

Poor heating performance

(Heater Model only)

Unit incorrectly sized for heat loss of room

heat, and the heating system must be correctly designed to
provide adequate flow of hot water to the unit (refer to section

2). If the recommendations in section 2 are not followed,

problems may arise as detailed below.

Possible Causes

Boiler thermostat set too low

Heating Mode

(Heater Model only)

poor heating

Lack of flow to fan convector -

Pump set on low setting

performance and/or

unit cycles on

Isolating valves not fully open

water sensor

System incorrectly balanced with unit starved of hot water flow

Pipe sizing to unit too small

13.0 Maintenance

11.0

Before undertaking any maintenance activity isolate the
electrical supply.

Maintenance should be restricted to occasional removal of dust
and lint around the unit. The outer surface may be wiped over

with warm water and mild detergent taking care to avoid water
entering the grille areas.

12.013.0