Johnson & Starley AQUAIR S-25 Guía del usuario

www.johnsonandstarley.co.uk

Johnson & Starley Ltd

Rhosili Road

Brackmills, Northampton

NN4 7LZ

Aquair Water To Air Space

Heaters

Aquair S-25

These instructions are to be left with the User

INSTALLATION, COMMISSIONING

& SERVICING INSTRUCTIONS

AQUAIRS-25

of Water to Air Space Heaters

Publication No. ZZ 1428-3

November 2021

www.johnsonandstarley.co.uk

In the interest of continuous development Johnson and Starley reserve the right to change speciﬁcation without prior notice.

Johnson and Starley prides itself on it’s ability to supply spare parts quickly and efﬁciently.

CONTENTS

1 Features 3

2 General Description 3

3 Building Standards & Regulations 4

4 Safety Information 4

Handling the Unit

Electrical Supply

5 Technical Data 4

6 Positioning & Preparation 5

7 Installation Instructions 5

Downﬂow Installation

Water Connections

Electrical Harness

8 Return Air System 5

9 Electrical 6

10 Circuit Diagram 6

11 Fan Performance 6

12 Operating Mode 7

High Temperature Mode

Low Temperature Mode

13 Commissioning 7

Setting Maximun Speed

Setting Minimum Speed

With Therimsta-stat Fitted

With No Thermista-stat Fitted

14 Servicing & Maintenance 7

Routine Maintenance

PCB Replacement

PCB Removal

Fan Removal

Heat Exchanger Removal

Air Filter Removal

15 Faulty Finding 8

16 Dimensions 10

17 Spares List 10

18 Exploded Diagram 11

Sales/Spares & Replacement Help Line 01604 752881

1. FEATURES

2. GENERAL DESCRIPTION

2.1 AQUAIR S is a water to air heat exchange unit with a heat output of 25kW (assuming a hot water supply at 80˚C

is available). Modairﬂow control is incorporated. A wire mesh ﬁlter is ﬁtted as standard. The unit requires a supply

of hot water at a minimum temperature of 60°C. Water connections are left or right handed through knockouts

in the sides of the cabinet.

2.2 The air is drawn in through the air ﬁlter or Cleanﬂow air cleaner (if ﬁtted) and the heat exchanger by a centrifugal

fan, and is discharged through the opposite end of the unit. A Summer Air Circulation switch (optional) provides

the facility to supply unheated air to the air outlets during warm weather. An external timer (not provided) will be

required if it is necessary to set the periods of operation.

2.3 The Aquair S Unit has been designed to allow downﬂow conﬁguration only.

FIGURE 1. AQUAIR S-25 FEATURES

1 Mains Supply

2 Air Filter

3 Air Circulation Fan with EC Technology

4 PCB Control Board

5 Hot water return to heat source

6 Hot water ﬂow from heat source

7 Flow Sensor

8 Heat Exchanger

9 Spigot Frame

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3. BUILDING STANDARDS & REGULATIONS

NOTE: Installation shall be in accordance with the following

• Building Standards (Scotland) (Consolidation) Regulations

• Building Regulations Part L

• The Water Fittings Regulations or Water byelaws in Scotland

• Model and Local Authority Byelaws

• BS 5720 Mechanical Ventilation and Air Conditioning in Buildings

• BS 7671 Institute of Electrical Engineers (I.E.E) Wiring Regulations

• Health & Safety Document No. 635.

• The Electricity at Work Regulations, 1989.

IMPORTANT: This appliance is CE certiﬁcated for safety and performance. It is important that no modiﬁcations are made

to this appliance, unless fully approved in writing by Johnson & Starley Ltd.

If in doubt please Ring Johnson & Starley Ltd on Telephone: 01604 762881.

* The manufacturers instructions supplied must not be taken as overriding any statutory requirements.

4. SAFETY INFORMATION

4.2 HANDLING THE UNIT

4.2.1 The weight of the this appliance exceeds that recommended for a one-man lift. It will therefore be

necessary to gain assistance at times during the removal from its packaging and during installation

procedure. Manoeuvring the boiler may include the use of a sack truck and involve lifting, pushing and

pulling.

4.2.2 It should be noted that this appliance may contain sharp edges. Care MUST be taken when handling

the appliance to prevent injury. We advise the engineer to wear suitable P.P.E.

4.2.3 Once the appliance has been ﬁred beware that certain parts will be hot to the touch.

4.2.4 Do not install ﬂues during rain, high winds or in severe weather conditions.

4.1 ELECTRICAL SUPPLY

4.1.1 Ensure the mains supply voltage, frequency, number of phases and power rating comply with details

on the rating label.

4.1.2 All wiring must be in accordance with the appropriate standards.

4.1.3 Ensure safety regulations and practices are adhered to when installing and using this appliance.

5. TECHNICAL DATA

TABLE 1 ITEM S-25

Nominal Rated Output kW 25

Air on Temperature ˚C 20

Air off Temperature ˚C 67

Water Supply Temperature ˚C 80

Water Return Temperature ˚C 55

Water Flow Rate l/s 0.25

Air Volume m³/h 1584

Water Connections bsp ¾

Maximum Water Pressure Bar 3

Maximum Power Consumption W 530W

Dimensions mm H/W/D 1078 x 480 x 710

Return Air Frame mm 587 x 400

Electrical Supply A 230V, 50Hz, fuse rated at 3A

Weight kg 70kg

Sales/Spares & Replacement Help Line 01604 752881

6. POSITIONING & PREPARATION

6.1 The unit should be positioned to suit any duct work. Mount on a plenum, if necessary or frame strong enough

to to hold the unit, avoiding any strain being placed on associated pipe and duct work.

6.6 Once the position of the unit has been decided, make sure all extra ancillaries are installed ready for the units

installation. A list of the ancillaries is available by contacting Johnson & Starley Ltd, Tel: 01604 762881.

6.2 Make sure all the electrical cables are in place.

6.3 It is important that the system is ﬂushed thoroughly prior to installation. Failure to do so could result in the

appliance a blockage and cause damage to the system and reduce the efﬁciency. This MUST to comply with

the water treatment guidelines.

IMPORTANT: It is recommended that the water system be drained and ﬂushed prior to the installation

of the unit. A strainer must be ﬁtted upstream of the unit.

6.4 Clearance of 750mm is required at the front of the casing for servicing and replacement of the heat exchanger.

It is recommended that provision be made for complete removal of the unit.

6.5 Sufﬁcient clearance must be provided for the assembly of ducting and pipework.

7. INSTALLATION INSTRUCTIONS

7.1 The Aquair S-25 appliance exceed the recommended weight for a

one-man lift as detailed in the Manual Handling Operations,1992

Regulations.

7.2 The once the unit has been unpacked unscrew the transit plate

from the base of the unit and discard.

NOTE: This unit could contain sharp edges and care MUST be taken

when handling.

7.3 DOWNFLOW INSTALLATION

See Figure 2

7.3.1 Remove the ﬁlter cover to expose the two screw holding

the door in place. Remove the screws and gently pull and

lift the door off the unit.

7.3.2 Lift the appliance onto the plenum or base support and

position correctly. Seal the joint with the appropriate

sealing material.

7.3.3 The water connections to the unit should be by

compression ﬁttings that are suitable for the duty and

isolation valves must be ﬁtted to facilitate the removal of

the heat exchanger assembly.

7.3.4 If a return air duct is not to be ﬁtted, the top of the unit

must be suitably guarded to prevent any blockage.

7.4 WATER CONNECTIONS

The water connections to the unit should be compression type ﬁttings that are suitable for the duty of the

appliance. Isolation valves must be ﬁtted to facilitate the removal of the heat exchanger assembly.

NOTE: Care must be taken with the heat exchanger matrix is fragile and is easily damaged.

7.5 ELECTRICAL HARNESS

Re-route the harness cable through the side knockout. Using the grommet attached, to seal the hole.

8. RETURN AIR SYSTEM

8.1 The return air system should be constructed of ﬁre-resistant material. It is important that the correct size of return

air grilles and ducting is used. Refer to table below for return air duct size, ﬂexible duct size and the return air

grille size at maximum output.

8.2

An adequate and unobstructed return air path is required from areas not served by a directly ducted return and to

which warm air is delivered. All such rooms should be ﬁtted with relief grilles which have a free area of 0.0088m²/kW

(1in²/250Btu/h) of heat supplied to the room. The only exceptions are kitchens, bathrooms and WC.’s.

FIGURE 2. DOWNFLOW CONFIGURATION

SCREWS AIR FILTER

PLENUM

DOOR

FILTER COVER

KNOCKOUTS

TABLE 2 DUCT EQUIVALENT SIZE FLEXIBLE DUCT SIZE RETURN AIR GRILLE

S-25 600 x 400mm (23” x 16”) 508mm (20”) dia 4200cm² (in²)

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FIGURE 4. AQUAIR S-25 CIRCUIT DIAGRAM

FIGURE 3. FAN PERFORMANCE GRAPH

9. ELECTRICAL

9.1 The appliance is supplied with PVC sheathed, 3 core 0.75mm2csa rated at 6A, connected to a terminal block

and exiting through the casing at the top left hand front. The cable is suitable for a 230V 50Hz single phase

supply.

9.2 The means of isolating the appliance MUST be via a double pole switch with a contact separation of at least

3mm in both poles, and fused at 3A. If switched live is ﬁtted, a triple pole switch should be used.

10. CIRCUIT DIAGRAM

11. FAN PERFORMANCE

COLOUR CODE

bn BROWN

bl BLUE

bk BLACK

g/y GREEN/YELLOW

r RED

w WHITE

or ORANGE

y YELLOW

Sales/Spares & Replacement Help Line 01604 752881

12. OPERATING MODES

12.1 HIGH TEMPERATURE MODE

12.1.1 For high temperature mode the J1 pins 1 + 2 has NO jumper.

12.1.2 With a thermista-stat connected (see note*), the fan will run when a water temperature of 60°C is

reached and stops when the water temperature falls to 42°C. The fan speed is controlled by the

thermista-stat demand.

12.1.3 With no thermista-stat connected, the fan will run when a water temperature of 44°C is reached, the

fan speed is controlled by the water temperature. The maximum fan speed reached when the water

temperature is at 60°C.

12.2 LOW TEMPERATURE MODE

12.2.1 For low temperature mode J1 has a jumper across pins 1 + 2.

12.2.2 With the thermista-stat connected, the fan will run when a water temperature of 33°C is reached and

stops when the water temperature falls to 20°C. The fan speed is controlled by the thermista-stat

demand.

12.2.3 With no thermista-stat connected, the fan will run when a water temperature of 22°C is reached, the

fan speed is controlled by the water temperature. The maximum fan speed reached when the water

temperature is at 32°C.

NOTE: Thermista-stat to be ordered separately.

13. COMMISSIONING

13.1 Ensure the heater is correctly ﬁtted with water and all air vented from the ﬂow and return circuits.

13.2 Switch on electrical supply.

13.3 Setting maximum speed.

Make a short across thermista-stat connections, if ﬁtted, and adjust the fan speed as required, remove the short.

13.4 Setting minimum fan speed.

Make a short across the pipe sensor and adjusted the fan speed as required, remove short.

13.5 WITH THERMISTA-STAT FITTED

13.5.1 Turn up thermista-stat to call for heat.

13.5.2 Check for 230V on switch live out.

13.5.3 With the water at the required temperature ensure fan starts

13.5.4 Allow the system to warm up and check temperature rise across unit is 40°C.

13.5.5 Set water differential to 20°C using lock shield valve or equivalent.

13.5.6 Turn off thermista-stat and check there is NO 230V on switch live out.

13.5.7 Check fan stops when water cools to required temperature.

13.6 WITH NO THERMISTA-STAT FITTED

13.6.1 With the water at the required temperature ensure fan starts.

13.6.2 Allow the system to warm up and check temperature rise across unit is 40°C.

13.6.3 Set water differential to 20°C using lockshield valve or equivalent.

13.6.4 Check fan stops when water cools to required temperature.

14. SERVICING & MAINTENANCE

14.1 ROUTINE MAINTENANCE

IMPORTANT: Before carrying out any work on the unit, ALWAYS ENSURE THAT IT IS ISOLATED FROM

THE MAINS ELECTRICAL SUPPLY.

Remove the ﬁlter and unscrew the two retaining screws holding the front cover on the unit, gently pull it forward.

Maintenance should be carried out at least once per year.

14.1.1 Check that the heat exchanger airways are free from obstructions. If necessary, clean with a

vacuum cleaner from the air inspection panel, taking care to not damage the airways.

CAUTION: THE ELEMENTS OF THE HEAT EXCHANGER ARE VERY FRAGILE.

14.1.2 Check the condition of the external strainer, cleaning as necessary.

14.1.3 Check that the air ﬁlter is being regularly cleaned in accordance with the User’s Instructions.

14.2 PCB REPLACEMENT

Ensure that the electrical supply is switched off and isolated.

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There must be a link between

High Voltage terminals 1 &

6 and high voltage terminals

3 & 6. Make sure both links

are present

MAF STAT CONNECTED NOT CALLING FOR HEAT (BOILER NOT FIRING) WHEN MAF STAT ON MAXIMUM

YES YES

YES

Is there 230 ~ 250VAC across High Voltage terminals 2 & 4?

Is there 230 ~ 250VAC across High Voltage terminals 1 & 2?

Measure DC voltage (5.1V DC Max.) across Low Voltage terminals 3 & 4

Is measured voltage greater

than 4.7V

Is measured resistance

greater than 11K?

Is measured voltage greater

than 4.7V

Check pipe sensor and

connections. If sound, isolate

from mains & measure resistance

across plug J2 pins 5 & 6

Is measured voltage greater than 4.19V?

Is there an external clock ﬁtted?

Measure DC voltage (5.1V DC

Max.) across Low Voltage

terminals 5 & 6

Check black wire of MAF stat

goes to Low Voltage terminal 3

and red wire of MAF stat goes to

low voltage terminal 4. Ensure all

connections are sound

Check clock is on & measure

output

Check for live supply into clock.

Replace clock if live is present

Is 230 ~ 250VAC present?

Check harness connections

to PCB. If all OK Replace

PCB

Remove MAF stat connections

and link Low Voltage terminals

TPV & 3. Is there 230 ~ 250VAC

across High Voltage terminals

2 & 4?

Open circuit between clock

out & High Voltage terminal

block 1

Unit mains

supply is

missing.

Check spur

e.g. fuse is

intact

Check

connections

to high voltage

terminals

2 & 3

Problem with switched live output going from High Voltage terminal 3 to

switch live of boiler

Is there 230 ~ 250VAC across High Voltage terminals 2 & 3?

15. FAULT FINDING

14.3 PCB REMOVAL

14.3.1 Disconnect the wiring at the PCB terminal block.

14.3.2 Release the 4 clips securing the PCB and withdraw the panel, disconnecting the fan supply lead at the

fan tray terminal block.

14.3.3 Reassembly or replacement is in reverse order.

14.4 FAN REMOVAL

14.4.1 Ensure that the electrical supply is switched off and isolated.

14.4.2 Disconnect the 2 inline connectors on the fan assembly.

14.4.3 Release the screws securing the fan and withdraw if from the location runners.

14.4.4 Reﬁtment or replacement is in reverse order.

14.5 HEAT EXCHANGER REMOVAL

14.5.1 Ensure that the electrical supply is switched off and isolated.

14.5.2 Close the isolating valves and drain down the unit.

14.5.3 Release the clip and remove the heat exchanger and its associated pipework from the unit.

14.5.4 Reﬁtment or replacement is in reverse order. Ensure that all air locks are expelled, and check for water

soundness.

14.6 AIR FILTER REMOVAL

14.6.1 Remove the ﬁlter cover.

14.6.2 Remove the two air ﬁlters out by sliding it from the front of the unit.

Sales/Spares & Replacement Help Line 01604 752881

FAN NOT OPERATING WHEN PIPE IS ABOVE 60°C

NOYES

YES

YES NO

YES

Is there and external clock ﬁtted or external mains room stat ﬁtted?Is there and external clock ﬁtted or external mains room stat ﬁtted?

Check for mains going into fan plug

There must be a link between high voltage terminals 1 & 6 and high

voltage terminals 3 & 6. Make sure both links are present

There must be a link between

High Voltage

terminals 1 & 6 and high

voltage terminals 3 & 6. Make sure both links are present

Measure DC voltage (0 to 10V) within Low Voltage fan connector

(blue & yellow)

Make sure mains is present across high voltage terminals 1 & 2

and 3 & 4

Make sure mains is present across High Voltage terminals 1 & 2

and 2 & 3

Is measured voltage greater than 2V?

Check pipe and connections.

If sound, isolate from mains &

measure resistance across plug

J2 pins 5 & 6

Does the actual pipe temp.

match the approx. pipe temp.

for the measured voltage in

Table A?

Is measured resistance greater

than 11K?

Faulty fan

Faulty PCB

Check sensor is ﬁtted correctly. If

it is then replace sensor.

Faulty PCB

PCB is not seeing sensor.

Conﬁrm by measuring

sensor resistance. Replace

sensor if resistance is greater

then 28K.

YESYES

In there 230 ~ 250 VAC across high voltage terminals 1 & 2?If there 230 ~ 250 VAC across High Voltage terminals 1 & 2?

Make sure mains is present across High Voltage terminals 2 & 3

Is the MAF stat connected?

Is fan now running?

Link out low voltage terminals 3 & 4.

Measure voltage across

Low Voltage

terminals 5 & 6

Is measured voltage greater than 4.7V DC?

Make sure clock or room stat supplies mains voltage to high voltage

terminals 1 & 2. No mains - no fan operation (except for summer vent)

DC VOLTAGE ACROSS

PIPE SENSOR APPROX. PIPE TEMP. °C DC VOLTAGE ACROSS

PIPE SENSOR APPROX. PIPE TEMP. °C

3.24 10 2.13 33 1.26 56 0.73 79

3.19 11 2.08 34 1.23 57 0.71 80

3.14 12 2.04 35 1.20 58 0.70 81

3.09 13 1.99 36 1.17 59 0.68 82

3.04 14 1.95 37 1.15 60 0.66 83

2.99 15 1.91 38 1.12 61 0.65 84

2.94 16 1.87 39 1.09 62 0.63 85

2.89 17 1.83 40 1.07 63 0.63 86

2.84 18 1.79 41 1.04 64 0.60 87

2.79 19 1.75 42 1.02 65 0.59 88

2.75 20 1.71 43 0.99 66 0.58 89

2.70 21 1.67 44 0.97 67 0.56 90

2.65 22 1.63 45 0.95 68 0.55 91

2.60 23 1.59 46 0.92 69 0.54 92

2.55 24 1.56 47 0.90 70 0.53 93

2.50 25 1.52 48 0.88 71 0.51 94

2.45 26 1.49 49 0.86 72 0.50 95

2.40 27 1.45 50 0.84 73 0.49 96

2.36 28 1.42 51 0.82 74 0.48 97

2.31 29 1.39 52 0.80 75 0.47 98

2.26 30 1.35 53 0.78 76 0.46 99

2.22 31 1.32 54 0.76 77 0.45 100

2.17 32 1.29 55 0.75 78 TABLE A

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FIGURE 7. AQUAIR S-25 DIMENSIONS

16. DIMENSIONS

17. SPARES LIST

ITEM DESCRIPTION QTY S-25

1 Air ﬁlter 2 AQ25-0185005

2 Air circulation fan with EC technology 1 1000-0525980

3 PCB control board 1 1000-0526275

4 Temperature ﬂow sensor 1 1000-0526505

5 Front Cover 1 AQ25-0199005

6 Heat exchanger 1 AQ25-0138005

7 Thermista-stat

(not shown)

1 BOS01242

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