View source for Installation Instructions for the SLIM Extra HIU

==Downloadable PDF==

{{PDFsum|SLIM Extra User and Installation Instructions|cover_SLIM_Extra.jpg|Comprehensive installation manual for the SLIM Extra HIU.|http://www.heatweb.co.uk/w/images/7/71/The_SLIM_Extra_HIU_Installation_Instructions_SE2.pdf}}

==Explanation of symbols and abbreviations==

===Symbols===

{{IMGC|Symbols.jpg|600px}}

===Abbreviations===
{{IMGC|Abbreviations.jpg|450px}}

==Introduction==

The SLIM Extra combines the power and control of the SLIM HIU, for the DHW circuit, with the addition of direct heating flow and return connections. The central heating system is directly connected to the district heating main, therefore expansion of the heating circuit is provided by the heat network and the unit does not require sealed central heating components or discharge pipework.

The outer casing is an attractive Steel casing, containing the SLIM HIU which itself is compartmentalised in an EPP moulded casing and all pipes are fully insulated.  Within the casing are all the components required for a typical property connected to a district network, these include temperature sensors and a pressure independent control valve for extremely accurate DHW control.  A diﬀerential pressure control valve is ﬁtted to the heating circuit with a motorised head for On/Oﬀ control via a room thermostat. This also provides a level of ﬂood limitation to reduce the ﬂow to a maximum rate of 1.5 l/min.  The Heat Meter display is routed out of the casing for mounting locally to the HIU on the wall.

As an option the SLIM Extra can be ﬁtted with our Node-HIU server, 4 relay channels (heating, prepay, plus 2 spare), and full ﬂood protection with alarming.  The Node-HIU server provides properties with a standard platform that can operate indeﬁnitely, without contracts, and provides all the necessary data storage and links to services, such as a User interface to control hot water and central heating locally or over the internet, from a mobile phone or computer, System monitoring for reporting on errors or poor eﬀiciency, Remote diagnostics and commissioning and Energy management and load balancing.

The SLIM Extra is supplied with 2 options for the valve connections.  Option 1 has all isolation valves mounted directly onto the bottom of the HIU casing, which is screwed directly to the wall.  Option 2 has all isolation valves connected to our standard pre-plumbing jig, for mounting to the wall and plumbing to in advance of the HIU being fitted.  The HIU may then be fitted to the pre-plumbing jig at a later date.  This option also has the added benefit of spacing the HIU off the wall, so that pipes may be run up the rear of the casing.

==Overview of Components and Connections==

{{IMGC|Slim Extra Components.jpg|450}}
<html><table align="center"><tr><td width="300" align="left"></html>
1 Mains Power Socket<br>
2 Terminal Box<br>
3 NODE HIU Server<br>
4 Heating On/Off Motorised head<br>
5 Heating On/Off DPCV<br>
6 DPCV Capillary<br>
7 Heat Meter Flow Sensor Port<br>
<html></td><td width="300" align="left"></html>
8 Heat Meter Spool Piece<br>
9 Domestic Hot Water Temperature Sensor<br>
10 Primary Flow Temperature Sensor<br>
11 Plate Heat Exchanger<br>
12 Flow Sensor<br>
13 Hot Water Control Valve<br>
14 DHW primary return temperature sensor<br>
15 HIU Controller 24V<br>
16 SLIM HIU<br>
<html></td></tr></table></html>

==Dimensions==

{{IMGC|Slim Extra Dimensions.jpg|440}}

==Technical Data==

{| class="wikitable"
|-
! DESCRIPTION !! DATA
|-
| Nominal primary supply temperature|| 80°C
|-
| Maximum primary supply temperature  || 90°C
|-
| Minimum primary supply temperature || 55°C *
|-
| Nominal DHW supply temperature || 55°C
|-
| DHW Set Range  ||  45°C to 60°C
|-
| Primary connections ||  ¾” Female / 18mm
|-
| Mains & DHW connections ||  15mm Compression
|-
| Central heating connections ||  ¾” Female / 18mm
|-
| Domestic Hot water heat exchanger (DHW) ||  E8AS‐24
|-
| Maximum primary differential pressure ||  250kPa
|-
| Minimum primary differential pressure  || 50kPa **
|-
| Pressure class DH circuit ||  PN16
|-
| Pressure class CH circuit ||  PN16
|-
| Pressure class DHW circuit ||  PN10
|-
| CH Maximum working pressure ||  2.5 Bar
|-
| Casing width ||  552mm
|-
| Casing height ||  654mm
|-
| Casing depth (Min depth from wall) ||  132mm (162mm)
|-
| Casing Material  ||  EPP Expanded Polypropylene / Painted Steel
|-
| Maximum Heat Losses  ||  <50W (1.2 kWh/day)
|-
| Typical Heat Losses (DHW Only, Keep Warm)  ||  10W
|-
| Weight (basic version) ||  <20kg ***
|-
| Electrical supply info  ||  230V 50Hz
|-
| Fuse ratings || 3 Amp
|-
| Sensor DHW  ||  NTC 10kohm @ 25°C
|-
| Keep Warm Modes  ||  Economy / Comfort
|-
| Max Return Temperature during Keep Warm Mode  ||  DHW Setpoint -2°C
|}

.* Minimum required DH supply temperature is DHW setpoint + 5°C with a minimum of 55°C.<br>
.** Depends on requested DHW output and available DH supply temperature.<br>
.*** Unit weight may vary depending on the optional components built into the unit

==Application==

The SLIM Extra HIU is used to provide hot water and central heating in properties connected to a district heating system
using a centralised boiler. Please keep the following conditions in mind during installation:

*The unit must be installed in a frost free area.
*The unit must not be exposed to direct sunlight.
*Ambient temperature should be between +5°C and +40°C.
*Humidity should be between 10% and 85%.
*The unit must be connected to a fused double pole isolator.
*The unit uses 230 VAC. Use caution when handling. Contact may lead to shock, burns or electrocution.
*Components in the unit and connected to the unit can reach high temperatures. Contact may lead to burns.

===Status indicator LED===

{{IMGC|SLIM Extra Status LED.jpg|600px}}

*Green blinking (slow): Standby condition
*Blue blinking: Domestic Hot Water Mode / Tap draw-off
*Red blinking: Error
*White continuous: Service mode (installer only)
*No LED: HIU is switched off

==Operation==
====Central Heating====
The direct hydraulic connection between the district heating system and the apartment heating system is the most efficient configuration as there is no heat loss across a plate heat exchanger, however it is important to understand that a leak on the apartment heating system will result in a significant amount of water being expelled from the district heating system.  The Danfoss AB-PM is designed to reduce the rate at which water is able to leak from the district heating system, but it cannot stop the leak completely without additional controls and intelligence in the district heating system.

[[File:Caution.jpg|150px]]

'''Components, pipes and radiators in, and connected to, the unit may be hot. The SLIM Extra heat interface unit is designed for use with centralised heating systems up to 90°C. The pipes and components in the unit and the pipes and radiators in the central heating installation can reach temperatures of 85°C and contact may lead to burns.'''

====Domestic Hot Water====
The unit is equipped with a single walled plate heat exchanger. The heat exchanger transfers the heat from the district heating system to the DHW. The electronics within the unit, together with domestic hot water control valve, temperature sensors and flow sensor, regulate the temperature of the hot water to it's set point (As Standard 55°C).

Each HIU has two domestic hot water keep hot modes, Eco or Comfort mode. These can only be selected during commissioning or by a trained engineer.

The default setting is Eco mode, and this can be specified to run for 0 minutes (which turns the feature off all together), 15, 30, 60 or 120 minutes after the last hot water draw off. In Eco mode the heat exchanger is kept to a specified temperature (between 25 and 60 Deg C) for the selected period of time and after this period of inactivity has elapsed the stepper motor closes completely and the temperature in the domestic hot water circuit is allowed to drop through natural dissipation to minimize energy consumption. If a hot water draw off is made at any time throughout the Eco mode function the unit will deliver hot water as usual and the Eco mode function will begin counting down for the selected time once again.
In Comfort mode the heat exchanger is continuously supplied with a trickle of primary water for quicker hot water delivery, however energy consumption will be slightly higher than if the unit was set in Eco mode.

To prevent legionella from growing the heat exchanger is heated to 57°C for at least 30 minutes every 24 hours. It is not possible to specify the time at which this occurs however it is an intelligent feature which adapts itself, shifting the legionella cycle to a time when the HIU is not in use. 

'''It is highly recommended to fit a filter on the mains cold water line, to filter fine particles, such as sand, from the cold water before it enters the heat exchanger.  Blockages and malfunctions due to debris in the water are not covered under the warranty.'''

[[File:Caution.jpg|150px]]

'''The hot water temperature is regulated to approximately 55°C. If there is a power outage during DHW draw off, units not fitted with a landlord security valve will stop regulating the hot water temperature. This may lead to a hot water temperature that is higher or lower than 55°C. Hot water can cause burns.'''

===Priority Switching===
The unit is '''NOT''' fitted with domestic hot water priority switching. When hot water is drawn off, the central heating control valve will remain open.

==General Plumbing Requirements==

{{:General_Plumbing_Requirements}}

==General Wiring Requirements==

{{:Wiring:_General_Wiring_Requirements}}

===Power Supply===

The SLIM Extra HIU is equipped with a wiring centre to accept incoming mains power, the central heating on/off signal and the MBus communication cable. The smaller SLIM HIU within is fitted with a transformer plug that converts the 230 VAC power supply to 24 VDC.

<big>'''CAUTION: ISOLATE THE MAINS SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.'''</big>

==Schematic==
{{:Schematic: SLIM Extra HIU}}

==Wiring Diagrams==

===Wiring Diagram - Basic===

{{IMGC|HIU Wiring 15030 Rev 00 img.jpg|600px}}

===Wiring Diagram - Basic - Revised Version===

{{IMGC|SLIM EXTRA-03 HIU Wiring Rev 01.jpg|700px}}

===Wiring Diagram - Node HIU (Page 1)===

{{IMGC|SLIM Extra HIU Wiring Diagram P1 R4.jpg|560px}}

===Wiring Diagram - Node HIU (Page 2)===

{{IMGC|SLIM Extra HIU Wiring Diagram P2 R4.jpg|520px}}

==Programmer and Room Thermostat Connection==
The unit can be equipped with an ON/OFF thermostat or programmable room thermostat, to control central heating timing and / or room temperature.  This control should supply 230Vac to the heating control valve.  (See wiring diagrams in section 11 of these instructions)

{{IMG|Warning_message.jpg|300px}}

Connecting the programmer / room thermostat:
# Refer to the wiring diagrams in section 11 of these instructions.
# Remove and discard the temporary link in the wiring centre.
# Connect a programmer / room thermostat (sold separately) heating call contacts across the relevant terminals of the HIU's wiring centre.

==Installation Requirements==

[[File:Caution.jpg|150px]]

'''Components, pipes and radiators in, and connected to the unit may be hot. The SLIM Extra heat interface unit is designed for use with centralised heating systems up to 90°C. The pipes and components in the unit and the pipes and radiators in the central heating installation can reach temperatures of 85°C and contact may lead to burns.'''

To ensure the life expectancy of the unit, the system must meet certain requirements. Keep following conditions in mind during installation:
* Maximum pressure supplied by the district heating network is 10 bar.
* Maximum differential pressure supplied by the district heating network is 250 kPa.
* Maximum supplied temperature by the district heating network is 90°C.
* Minimal supply temperature is setpoint DHW + 5°C.

===Central heating===

'''NOTE''' For optimal energy efficiency and comfort, it is of the utmost importance to hydraulically balance the CH system correctly. For the same purpose it is advisable to design the CH system in such a way that the CH return temperatures are as low as possible.  We would recommend the use of [[Danfoss RA-DV Radiator Valves]].

==Suggested Pipework layout==

{{IMGC|SLIM Extra Plumbing Schematic.jpg|650}}

==Installation Setup==

===Parts Supplied and Required for Installation===
{{IMGC|SLIM_Extra_allbits.jpg|650}}

===Connections===
{{IMGC|SLIM Extra Connections.jpg|400}}

==Stage 1 - Mounting to the wall==

Depending on the configuration being installed, the SLIM Extra can be mounted directly onto the wall or on to a pre-plumbing jig.  Below are the fixing centres for each option.

#Mark out the wall with the fixing points using the dimensions shown below.
#Drill holes using a suitable drill bit to suit wall plugs provided in accessory pack.
#Using a level, fit the pre-plumbing jig or HIU to the wall.
#Continue with external pipework as required. With isolating valves closed the systems can be filled for testing.
{{IMGC|SLIM Extra Mounting Options.jpg|650}}

'''Mounting to a plywood wall:'''
Minimal plywood thickness must be 18mm. Make sure that the back wall is at least 50mm wider than the unit to ensure a proper support. Make sure the drill markings are aligned and leveled. Drill holes of Ø4mm on the marked
locations 40mm deep. 4 holes are drilled for the pre-plumbing jig and only 2 for mounting the unit directly to the wall. Mount the unit firmly to the wall using the enclosed screws.

'''Mounting to a concrete wall:'''
Make sure the wall is robust and of good quality. Avoid hollow walls and make sure that the screws are not placed in the flushings of a brick wall. Drill holes of Ø10mm on the marked locations 60mm deep. 4 holes are drilled for the pre-plumbing jig and only 2 for mounting the unit directly to the wall. Mount the unit firmly to the wall using the enclosed screws and plugs.

==Stage 2 - Mounting on to the Pre-plumbing jig==

If the Pre-plumbing jig is being used, then it is necessary to partially dismantle it before fitting the HIU.  '''ENSURE ALL ISOLATION VALVES ARE IN THE CLOSED POSITION.'''
#Remove the lock nut from each isolation valve, together with the 2 cross brace securing screws.
#The HIU can then be mounted over the isolation valves to sit on to the cross brace, then the lock nuts and cross brace securing screws can be fitted through the HIU.
#Finally fit fibre washers to all isolation valves and connect the pipe unions.
{{IMGC|Preplumbing Jig assy.jpg|650}}

==Stage 3 - Pipework connections==

If the Pre-plumbing jig is already fitted, it is likely that it is also connected to the system pipework.  If not, make all pipework connections as per the [[#Overview of Components and Connections|Overview of Components and Connections]] section of these instructions.

==Stage 4 - Fitting a Heat Meter==

If a Heat Meter is to be fitted, first remove and discard the spool piece, and pipe cap shown below.  The heat meter must have 3/4" BSP connections with 110mm across union faces and should have the return sensor directly mounted into the body.  The Heat Meter must be installed in the primary return pipework of the HIU, with the hot (red) temperature sensor directly mounted into the primary pipework flow.  Always fit new fibre washer seals, and ensure that the temperature sensor is correctly fitted with its seal, as per the heat meter installation instructions.
{{IMGC|SLIM Extra Heat Meter FittingA_B.jpg|480}}

==Stage 5 - Filling the Heating System==

'''The SLIM Extra HIU hydraulically connects the apartment heating circuit to the primary district heating circuit.  It is therefore important that the apartment heating circuit can withstand the pressure imparted by the district heating system.'''

When filling the apartment heating circuit, it is important that the process is coordinated throughout the district heating circuit right back to the plantroom.  It may be necessary to disable any leak alarms or leak prevention valves, and the automatic pressurisation unit may need to be enabled.  It is also important that the system is filled with the correct level of inhibitor.

Carry out the following steps to fill the apartment heating circuit:-
# Ensure all isolation valves are fully closed.
# Remove the TWA-z actuator from the AB-PM Valve, so that the valve is in the open position.
# Ensure the AB-PM valve is set to a flow of 70% or higher. (see AB-PM instructions) '''The apartment heating circuit will not fill unless the AB-PM valve is opened'''
# Open the flow and return isolation valve on the secondary heating circuit (blue and red valves on the right hand side).
# Now gradually open the primary flow isolation valve (red valve on the left hand side), to allow flow into the apartment heating system.  Wait until flow into the system reduces and any automatic air vents finish venting air.
# Now gradually open the primary return isolation valve (blue valve on the left hand side) , to allow flow to continue through the apartment heating system, and back into the district heating system.
# Ensure all radiators are fully bled, and that the system is fully checked for leaks. 
# Adjust the AB-PM valve for the required heating flow rate, and lock. (see AB-PM instructions)
# Ensure the TWA-z actuator head is securely fitted. '''DO NOT USE any tools to tighten the actuator to the valve.''' (see AB-PM instructions) 
# Balance the apartment radiators to achieve the desired flow and temperature at each.

==Stage 6 - Connect Power==
1. Close all isolation valves in the property.

2. Check all coupling nuts for leakage. (nuts may become loose
during transport)

3. Make sure the electronics are securely mounted to the frame
and avoid cables and pulse pipes from fouling the casing.

4. Connect the units power cables to the wiring centre as shown in the wiring diagrams in section 11 of these instructions, and then connect to the power outlet.
*Blue cable: N (Neutral)
*Brown cable: L (Live)
*Green/yellow cable: E (Earth) [[File:Earth Symbol.jpg|15px]]

5. Switch on the power supply to the unit. The Status Indicator LED should show a
green blinking light.

6. Check that the central heating controls are calling for heat and
the system begins to warm.

7. Slowly open a hot tap in the property. Check to see if the units
LED shows a blue blinking light. Open the hot tap completely
when the system is fully bled and leave it running for
approximately 5 minutes. After 3 to 5 minutes check the water
temperature at the tap is between 45°C and 60°C (Depending on the
setpoint).

8. Close the hot tap in the property. The LED will now show a green
blinking light.

==Service and inspection==

To ensure proper functioning of the unit, it is advised to periodically inspect the installation. Contact your District Heating Management company about the possibilities for service and inspection. Maintenance and repairs must only be performed by approved personnel.

* Remove the power from the unit when performing maintenance and/or repairs.
* Close the primary flow and return isolation valves.
• Close the secondary flow and return isolation valves.
• Check the unit for dirt/leaks.
• Check any external strainers for dirt and debris and clean if necessary.
• Check all internal valves for pollution and clean if necessary.
• When recommissioning, check the unit for the delivery of DHW and central heating.  
• The outer steel casing can be cleaned with a damp soapy cloth. By no means use abrasives of any kind.

[[File:Caution.jpg|150px]]

'''The unit uses electrical components (230Vac). These components must stay dry at all times. Please use caution when handling these energised components. Touching these energised components can result in an electric shock, burn, or electrocution.'''

==Away or on holiday==

Do not remove power from the unit. Do not switch the unit off during a long absence or holiday. To prevent damage from frost in the piping of the unit or the distribution network one must not, '''under any circumstances''', close the isolation valves to the unit and/or the district heating network. It is recommended to flush all water tapping points for at least 2 minutes after a long period of absence.

==Troubleshooting for End users==

{{:Table:_DATA_End_User_Troubleshooting}}

==Troubleshooting (for Technicians)==

{{:Table:_SLIM_Extra_Advanced_Troubleshooting|Troubleshooting for technicians}}

==Zenner Ultrasonic Heat and Cooling Meter==

{{:Zenner_C5_Heat_Meter}}

==Flamcovent Clean Smart Dirt and Air Separator==

{{:Flamcovent_Clean_Smart_Dirt_and_Air_Separator}}

==Guarantees and After Sales Backup for HIUs==

{{:Guarantees_and_After_Sales_Backup_for_HIUs}}

==Declaration of Conformity==

{{:SLIM_EC_Declaration}}