Lochinvar LTS454B Low Temperature Air Source Heat Pump Instruction Manual

Lochinvar LTS454B Low Temperature Air Source Heat Pump

Product Information

The Amicus LTS454B is a low-temperature air source heat pump designed for efficient heating. It comes in various models with different dimensions and shipping weights to suit different project requirements. For detailed technical data, refer to the technical product submittal on the manufacturer’s website.

Specifications

• Model: Amicus LTS454B
• Language: English
• Version: V1.0 January 2024
• Modified by: S Addis

Product Usage Instructions

Sizing Considerations
When sizing the air source heat pump, consider the design outside air temperatures as the output may vary based on conditions. Contact Lochinvar for assistance in sizing your project.

Positioning on Site
Ensure minimum clearances around the unit to allow proper airflow through the heat exchanger and prevent operational issues. The required clearances vary based on the model used.

FAQ

• Q: Where can I find detailed technical performance data for each model?
  A: Detailed technical data for each model can be found on the technical product submittal at: https://lochinvar.ltd.uk/amicus-air-source-heat-pumps/

• Q: How do I determine the required clearances for multiple units?
  A: Refer to table 4 in the user manual for airflow clearances required for multiple units based on the specific models being used.

Introduction

This document includes all the basic information required for the Design team from stage 2 to stage 5 of the project.
The Lochinvar Amicus Low-temperature air source heat pump range has been designed to provide heating and DHW only and can work at temperatures up to 59°C (at +5°C external air) and can maintain 45°C in external air temperatures as low as -10°C. There are 20 models in the range with outputs ranging from 22 to just over 463kW at standard rating conditions External air+7C 30/35 flow. The individual technical product submittal for each heat pump supplies detailed data on outputs ranging from 35 to 59°C flow with external air temperatures of +20 to -10°C. All units can also be supplied as RV two pipe heating and/or cooling units.
Each heat pump has the following standard features:

• R454B Scroll compressors utilizing a low GWP refrigerant.
• Source heat exchanger made from copper with low air resistance to allow slower rotating fans and thus reduce noise.
• Direct drive fans with low speed of only 600rpm.
• User heat exchanger made from 316 stainless steel.
• Condensate drip tray with antifreeze heater, collects condensation from the source heat exchanger which can then be piped to drain.
• Antifreeze kit which prevents internal pipework from freezing whilst the unit is non-operational.
• Control panel which can be removed from the heat pump and mounted within the plantroom up to 50 metres away.

General

The Amicus air source heat pump should be sited in an area which:

• Can bear the Weight of the unit.
• Has enough space around the unit to allow the correct airflow across the source heat exchanger, see table 2.
• Is not too windy.
• Does not present a noise nuisance to users of the building and neighbors.

Operational limits
Amicus low-temperature heat pumps can provide heating and/or domestic hot water at temperatures up to 59°C, and can operate in external temperatures down to as low as -20°C. The diagram below shows the general working limits and should be cross-referenced with the data shown in the individual model Technical Product Submittal as each is slightly different.

Sizing
When sizing the air source heat pump careful consideration needs to be taken of design outside air temperatures as the output from the heat pump will be much lower at -5C than shown in the standard rated conditions. Lochinvar can help with sizing your project, contact your local area sales manager or email sales@lochinvar.ltd.uk

Technical details

Dimensions|  |  | LAHP-452LTS-454| LAHP-512LTS-454| LAHP- 682LTS-454| LAHP-752LTS-454| LAHP-912LTS-454
---|---|---|---|---|---|---|---
Height| A| mm| 1673| 1673| 1839| 1839| 1918
Length| B| mm| 2400| 2400| 3000| 3000| 3000
Width| C| mm| 1265| 1265| 1265| 1265| 1265
Shipping Weight|  | Kg| 650| 658| 884| 890| 1100

Dimensions|  |  | LAHP-1102LTS-454| LAHP-1152LTS-454| LAHP- 1352LTS-454| LAHP-1502LTS-454| LAHP-1612LTS-454
Height| A| mm| 1918| 1918| 1918| 1918| 1918
Length| B| mm| 3000| 3000| 4295| 4295| 4295
Width| C| mm| 1265| 1265| 1265| 1265| 1265
Shipping Weight|  | Kg| 1108| 1110| 1668| 1714| 1722

Dimensions|  |  | LAHP-1792LTS-454| LAHP-2012LTS-454| LAHP- 2304LTS-454| LAHP-2312LTS-454| LAHP-2654LTS-454
Height| A| mm| 1918| 2287| 2378| 2287| 2378
Length| B| mm| 4295| 4296| 4515| 4296| 4515
Width| C| mm| 1265| 1265| 2310| 1265| 2310
Shipping Weight|  | Kg| 1776| 1762| 3262| 1778| 3348

Dimensions|  |  | LAHP-2954LTS-454| LAHP-3214LTS-454| LAHP- 3514LTS-454| LAHP-3954LTS-454| LAHP-4454LTS-454
Height| A| mm| 2378| 2378| 2378| 2378| 2378
Length| B| mm| 4515| 4515| 4515| 5557| 5557
Width| C| mm| 2310| 2310| 2310| 2310| 2310
Shipping Weight|  | Kg| 3438| 3480| 3508| 3658| 3686

Table 1 Dimensions and Weights

Drawing 1 Dimensions
Full technical details including detailed performance data for each model can be found on the technical product submittal at: LTStps://lochinvar.LTSd.uk /amicus-air-source-heat-pumps/

Position on site

Amicus air source heat pumps require minimum clearances around them to enable the fan which is fitted on top of the unit to draw sufficient air through the source heat exchanger (evaporator) which is fitted to the Right-hand side on models LAHP-452LTS to LAHP-752LTS when viewed from the front and on both sides on models LAHP-912LTS to LAHP-4454LTS. Clearances also prevent exhaust air recirculation which can create operational problems for the units.

Drawing 2 Airflow across the unit

The type of model used will impact the required clearances and how multiple units can be laid out.
*All Amicus Air Source Heat Pumps, during defrost mode, produce condensate at the base of the source heat exchanger. If the ambient temperature is below 0⁰C, the water may freeze, creating a thick layer of ice within the appliance. This layer of ice, in specific conditions, may damage the heat exchanger and therefore, to guarantee correct operation of the unit it is highly recommended to raise the Amicus ASHP by a minimum amount as shown in table 2 using either a bigfoot type system as shown or by making the plinth the same dimensions as the heat pump

Table 2 Airflow clearances required for a single unit (see table 4 for multiple units).

1152LTS-454
A| mm| 1000| 1000| 1500| 1500| 1500| 1500| 2000
B| mm| 800| 800| 1000| 1000| 1000| 1000| 1000
C| mm| 800| 800| 1000| 1000| 1000| 1000| 1000
D| mm| 800| 800| 1000| 1000| 1000| 1000| 1000
E| mm| 3000| 3000| 3000| 3000| 3000| 3000| 3000
F| mm| 350| 350| 350| 350| 350| 350| 350**

Legend| Unit| Model
LAHP-1352LTS- 454| LAHP-1502LTS- 454| LAHP-1612LTS- 454| LAHP-1792LTS- 454| LAHP-2012LTS- 454| LAHP-2304LTS- 454| LAHP-2312LTS- 454
A| mm| 2000| 2000| 2000| 1000| 1000| 1500| 1500
B| mm| 1000| 1000| 1000| 800| 800| 100| 1000
C| mm| 1000| 1000| 100| 800| 800| 100| 1000
D| mm| 1000| 2000| 2000| 800| 800| 100| 1000
E| mm| 3000| 3000| 3000| 3000| 3000| 3000| 3000
F| mm| 350| 350| 350| 350| 350| 350| 350

Legend| Unit| Model|
LAHP- 2654LTS-454| LAHP- 2954LTS-454| LAHP- 3214LTS-454| LAHP- 3514LTS-454| LAHP- 3954LTS-454| LAHP- 4454LTS-454
A| mm| 1500| 1500| 2000| 2000| 2000| 2000
 | mm| 1000| 1000| 1000| 1000| 1000| 1000
C| mm| 1000| 1000| 1000| 1000| 1000| 1000
D| mm| 1000| 1000| 1000| 1000| 2000| 2000
E| mm| 3000| 3000| 3000| 3000| 3000| 3000
F| mm| 350| 350| 350| 350| 350| 350

Fencing or an acoustic shroud can be fitted around Amicus units, these must comply with the minimum service clearances shown in table 3 or must be removable for service access. The fence must allow enough airflow as required for the unit to be installed and can be found in the technical submittal for the unit.

Locations near the coast
If the heat pumps are to be located within one mile of the coast or tidal water, then the unit should be ordered with the source heat exchanger treated to ensure premature saltwater corrosion does not occur.

Positioning multiple units

When positioning Multiple Amicus units’ minimum distances must be observed according to model size to ensure uninterrupted airflow and service access, to make the most of the available space some suggested plant layouts are shown in the layout drawings 7 to 11.
Distance A1 should be a minimum of 1.5 times distance A as shown in table 2.

Safety Clearances

The refrigerant used on these models is R454B which is classed as A2L and is slightly flammable, all installations must be in accordance with EN378-1 and EN378-3 and as such the installation site must take into effect the accidental leakage of any refrigeration.
The unit(s) must be installed within a 3000mm exclusion zone from any electrical installations such as switches and any entrances into the building that are not sealed such as drains or doorways.
THE UNIT MUST BE INSTALLED IN SUCH A POSITION THAT ANY ACCIDENTAL LEAKAGES CANNOT ENTER THE BUILDING.
In the example below the wiring centre, rainwater drain and louvred door would all need to be outside the exclusion zone.

Sound Power data
Table 5 Sound power levels for standard LTS units

• Lw: Sound power level according to ISO 9614
• Lp: Sound pressure level measured at 10 metres from the unit in free field conditions direction factor Q=2 to ISO 9614

Pipework sizing and flow rates

Pipework should always be sized to match the flow rates below and maintain a 5k delta T, this will result in larger pipework compared to a traditional 20k system design. Amicus can be supplied with a hydraulic kit which includes a suitably sized primary pump within the unit or alternatively one can be specified by the design engineer and fitted within the plantroom, this will enable a twin-head pump to be used if required. A suitable flow setter must be fitted to every Amicus unit installed to set the correct flow rate at commissioning.

Table 6 Design flow rates

Buffer vessel sizing

Amicus air source heat pumps require a certain amount of system volume to ensure problem-free running and to reduce the number of starts and hence wear and tear on the compressor. In practise in most installations a buffer vessel will be required. The minimum system volume will:

1. Prevent the unit cycling during low demand.
2. Allow the unit to defrost without affecting the heat available to the system.

Table 7 Minimum water content required.

Lochinvar will offer a suitably sized buffer vessel depending upon what the Amicus units are supplying but are generally sized according to the output of the unit at 2°C ambient. Multiple units with cascade control fitted do not require a substantially larger buffer as only one unit will be allowed to go into defrost at a time. For example, two number LAHP-602LTS units may only require 800-litres.

DHW Supply

Amicus LTS can supply low-temperature hot water at up to 59°C for use in providing domestic hot water (DHW), because of the way the internal control works this will result in a maximum temperature within the DHW vessel of 57°C. The Amicus LTS range will only achieve this maximum temperature when external air temperatures are above +5°C so an immersion heater or gas-fired water heater will be required to assist during cold winter days. Lochinvar can provide a full bespoke bi-valent hot water system, contact us for further details. Generally, DHW is provided by a specially designed plate and buffer arrangement which has been sized according to the required flow rate, delta T and only a 2k temperature drop between the primary and secondary side of the plate. (See drawing 13) The plate must be sized according to the Amicus kW rating during summer months to take advantage of the extra power available. For system requiring DHW to be stored above these temperatures or those requiring a higher temperature pasteurization this will need the assistance of a boost immersion heater fitted to the DHW vessel.
If the Amicus is supplying DHW only then the DHW storage vessel will also act as the buffer vessel.

Electrical Connections

All models require a 3-phase supply with standard electrical requirements as per table 8.
Table 8 electrical requirements for a standard unit.

These are generic values, actual values will depend on accessories chosen.
Provision should be made for local isolation with a lockable isolator fitted on or very close to the heat pump. If the heat pump is to be sited some way from the plantroom, a single weatherproof 230v plug socket should also be fitted to aid the commissioning and future maintenance of the unit.

Standard electrical connections available

Standard electrical connections

Connection| Note
BTI sensor| Monitor’s temperature in the buffer vessel
BTs sensor| Monitor’s temperature in the DHW vessel
Primary pump| Either integrated as part of Hydraulic kit or fitted within the plantroom
DHW Primary pump| Fitted between the heat pump plate and DHW storage vessel
Remote on/off|
Summer/winter mode| Switches to DHW only in summer
Hot water priority|
General alarm|
3-way valve| Switches between heating and DHW

Electrical ancillaries available

1. Cascade control, this will be supplied as standard on projects with more than one heat pump.
2. Soft start, reduces the peak Amps at start-up as shown in table 8.

Harmonics
Power supply companies often ask for information regarding the harmonics of the units, all Amicus air source heat pumps are constructed in compliance with the following standards:

1. EN61000-3-2
2. EN61000-3-3
3. EN61000-3-11
4. EN61000-3-12
   This will satisfy the Power supply company that the heat pump will not give problems on site.

Standard installation schematics

This section contains various standard schematics showing the concept installation options for the Amicus range. These drawings must not be used for detailed design but can be built upon by the design team to produce their own installations drawings. Lochinvar does not provide detailed installation drawings but can review any produced by the design team.

Installation assistance

Included in the cost of every Amicus unit is the use of the Lochinvar Project Engineer and commissioning. This helps ensures the units are installed correctly and the end user has the assurance the manufacturer has commissioned the unit. After orders are placed a Project Engineer will contact the installer and offer:

1. Initial pre-start visit to ensure the installer has all the required information to install the units and has the Project Engineer’s contact details for telephone and email support during the construction phase.
   • This visit covers flow rates, Location of equipment, wiring/controls, integration with other equipment and any other questions the installers may have.
2. A second visit during installation to make sure everything is OK.
   • This visit will review the progress and check everything is going ok, answer any further questions relating to the install – at this stage it is also good to meet the controls/BMS team.
3. A pre-commissioning visit to ensure all installation work is complete prior to the Lochinvar commissioning engineer visit.
   • On this visit we will complete the pre-com sheet ensure all works are complete and plan in a commissioning date.
4. Commissioning visit

On completion of the commissioning, the installer will receive a detailed report.

Cooling

Amicus LTS models can be supplied as RV models, these are two pipe heating and/or cooling units with domestic hot priority in either heating or cooling mode.
The units are identical in size to the heating-only versions with all technical data available on the individual model Technical product submittal available from https://lochinvar.ltd.uk/amicus-air-source-heat-pumps-lt/

Operational limits
Amicus high-temperature heat pumps can provide cooling even with external air temperatures of 40°. The diagram below shows the general working limits and should be cross-referenced with the data shown in the individual model Technical Product Submittal as each is slightly different.

8 Lombard Way, The MXL Centre, Banbury, Oxon, OX16 4TJ
Tel: +44(0) 1295 269 981
Fax: +44(0) 1295 271 640
Email: info@lochinvar.ltd.uk
www.lochinvar.ltd.uk

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