Lochinvar LAAS8-455-6 Amicus Aquastore Largest Heat Pump Water Installation Guide

: June 13, 2024
: Lochinvar

Lochinvar LAAS8-455-6 Amicus Aquastore Largest Heat Pump Water

Installation Guide

AMICUS AQUASTORE INSTALLATION PLANNING GUIDE

Document Control

Introduction

This document includes all the basic information required for the Design team from stage 2 to stage 5 of the project.

Amicus Aquastore is a packaged Heat pump water heater designed to be installed inside the plantroom and configured to provide DHW only and can supply hot water at temperatures up to 65°C. There are 3 models in the range all featuring an 8kW heat pump but with different sized immersion back-up available from 6kW to 12 kW.

Aquastore has three modes of operation to choose from depending on domestic hot water load and average ambient temperatures:

Efficiency mode, as the name suggests this is the most efficient mode for the unit to operate The immersion heaters will only be switched on in extreme circumstances.
Hybrid mode, will utilise the immersion heaters more often increasing domestic hot water production
Electric mode utilises the immersion heaters only and can be used to pasteurise the tank or for breakdown cover in the unlikely event the unit should suffer a failure on the refrigerantEach heat pump has the following standard features:
8kW output
Plug & Play – Quick and easy to install with space saving design
Touch screen display for custom settings and status reports
Monoblock construction
445 litre storage capacity with external coil for direct heating from the refrigerant
65˚C output in heat pump mode, 82˚C in Electric mode
up to 250l/hr recovery @50˚C temperature rise in Efficiency mode and up to 350l/hr in Hybrid mode
Built in redundancy – up to 12kW immersion available for backup

Sizing

Aquastore can be sized on either Efficiency or Hybrid mode using the table below, the green row shows a typical one- hour peak supply utilising the stored water and recovery.

|

LAAS8-455-6

|

LAAS8-455-9

|

LAAS8-455-12

|

LAAS8-455-6

|

LAAS8-455-9

|

LAAS8-455-12

---|---|---|---|---|---|---
Tcold = 10°C / Tset = 65°C| Efficiency Mode| Hybrid Mode
Draw capacity direct ΔT=28 K| ltr.| 590| 590| 590| 590| 590| 590
30 min. ΔT= 28 K| ltr.| 690| 710| 730| 750| 780| 810
60 min. ΔT= 28 K| ltr.| 800| 830| 860| 1000| 1040| 1070
90 min. ΔT= 28 K| ltr.| 910| 950| 990| 1250| 1300| 1340
120 min. ΔT= 28 K| ltr.| 1020| 1070| 1130| 1510| 1570| 1600
Tcold = 10°C / Tset = 65°C| Efficiency Mode| Hybrid Mode
Draw capacity direct ΔT=50 K| ltr.| 260| 260| 260| 260| 260| 260
30 min. ΔT= 50 K| ltr.| 300| 300| 300| 330| 340| 350
60 min. ΔT= 50 K| ltr.| 350| 350| 360| 460| 480| 490
90 min. ΔT= 50 K| ltr.| 390| 400| 410| 600| 620| 630
120 min. ΔT= 50 K| ltr.| 430| 450| 470| 730| 760| 780

General

Amicus Aquastore should be sited in an area which:

Can bear the weight of the
Has enough space around the unit to allow maintenance, see table
Does not present a noise nuisance to users of the building and
Has enough ventilation, see section Airflow

Operational limits

Amicus Aquastore can provide domestic hot water at temperatures up to 65°C when in Hybrid mode and 85˚C when in power mode using the electrical elements only, for example for pasteurisation. The diagram below shows the general working limits of the heat pump only. Outside these limits the Aquastore will use the immersion heaters to achieve the 65˚C set point.

Drawing 1 operational limits

Sizing

When sizing the Aquastore heat pump careful consideration needs to be taken of the hot water load and peak demand period. Lochinvar can help with sizing your project, contact your local area sales manager or email [email protected]

Technical details

Table 1 Technical details

Model	LAAS8-455-6	LAAS8-455-9	LAAS8-455-12
Input power heat pump operation	kW	2.22	2.22
Heating capacity heat pump (EN 16147 – A15)	kW	8	8
Efficiency COP		3.2	3.2
Heating capacity electric elements	kW	6	9
Power supply		400Vac/3N	400Vac/3N
Total heating capacity	kW	14	17
Peak current	A	39.5	50.8
Maximum current (L1) – heat pump	A	9.6	9.6
Maximum input (L2) – back up element 1 + controls + fans	A	16.9	22.5
Maximum current (L3) – back up element 2	A	13	18.7
Refrigerant (weight.CO2 equivalent)	(kg/ton)	R134 (1.85/2.646)	R134
(1.85/2.646)	R134 (1.85/2.646)
Tank volume	Ltr	445	445
Max Water Temperature Efficiency or Hybrid mode	°C	65	65
Max Water Temperature Immersion heaters only	°C	85	85
Operating range	°C	-7 – 43	-7 – 43
Shipping weight	kg	226	226
Weight when full	kg	684	684
Sound Power-Indoors	dB	59	59

Table 2 Dimensions

| | | LAAS8-455-6| LAAS8-455-9| LAAS8-455-12
---|---|---|---|---|---
A| Device height| mm| 1770
D| Device width| mm| 785
E| Device depth| mm| 995
M| Height cold water supply connection| mm| 165
B| Height hot water outlet connection| mm| 1470
R| Height drain valve connection| mm| 165
S| Height T&P-valve connection| mm| 1470
W| Height condensate drain connection| mm| 15
1| Cold water supply connection (female)| NPT| 3/4″
2| Hot water outlet connection (female)| NPT| 3/4″
4| Drain valve connection (female)| NPT| 3/4″
5| T&P-valve connection (female)| NPT| 3/4″

Drawing 2 Dimensions

Position on site

Amicus Aquastore must only be installed in a plantroom it is not suitable for external installation, the plantroom must be large enough to prevent the plantroom from cooling down too much whilst the unit is in operation. The size of the plantroom required will depend on the usage patterns of the heat pump, the larger the peak the larger the plantroom will need to be.
Amicus Aquastore require minimum clearances around them to enable maintenance of the unit.

Drawing 3 clearances single unit

The front of the unit must maintain a clearance of at least 1000mm to ensure the exhaust fans are not restricted which will cause operational issues. Side clearances are required for future maintenance and are critical to enable the immersion heaters to be removed for inspection for example.
Due to the condense drain exiting at the bottom the unit should be stood on a base of at least 100mm, a suitable metal base is available from Lochinvar, item number LM900474A as can be seen in the photo on page 9.

Airflow

Amicus Aquastore require a constant air flow when in operation of 2275 m3/h across the evaporator, this will result in a gradual cooling of the plantroom air. The unit should not cool the room by more than 8C, if it does this indicates that there is insufficient air within the plantroom. Ideally air should be drawn from an indoor space to increase seasonal efficiency as shown in the warehouse installation picture on page 9. If the unit is to be sited within a plantroom the amount of ventilation should be calculated as per table 3 with both inlet and exhaust air louvres provided as per drawing 4 on page 9.

D rawing 4 airflow requirements

__ Table 3 airflow calculations based on an ambient air temperature of 10˚C

Key to chart above
V= room volume in m3
Bottom numbers show the minimum plant room temperate acceptable Left hand numbers show ventilation required in m3/hr
Example airflow calculation 1
Plantroom is 7m x6m x 2.5m high = 105m3
Closest line is the 100m3 3rd from the left, if we do not want the plantroom to drop below 5C we will require 2000m3/hr of air into and exhaust from the plant room
Example airflow calculation 2
Unit to be installed in a warehouse space 40m x25m x 6m high = 6000m3 Additional ventilation is not required

Positioning multiple units

When positioning multiple units’ minimum distances must be observed as per drawing 3, airflow requirements will also be larger. please contact Lochinvar technical support for further help and guidance.

Installation

Amicus Aquastore can be installed as a single unit or in multiples depending upon the load, if there is a larger peak load than the unit can supply and then a prolonged period with limited demand (such as a football training ground), Aquastore can be matched with a suitable sized buffer vessel see drawing 7. This will reduce capital cost whilst allowing an efficient method of producing hot water without using extra immersion heaters.

Drawing 5- Single Aquastore on an unvented system

Drawing 6- Multiple Aquastore on an unvented system

Drawing 7-Aquastore with buffer vessel

Drawings Master Key

A suitable unvented systems kit is available from Locinvar,item number WH15A- RF which consists of

22mm Monoblock incorporating a pressure reducing valve, non-return valve and 6 bar pressure relief valve
¾” temperature and pressure relief valve
22mm tundish
25 litre flow through expansion vessel c/w flow through valve

To improve stratification within the vessel it may be a site requirement to install a de-stratification pump, this is available from Lochinvar as an ancillary extra, item number WH9. This kit consists of:

1no LM900139A Bronze pump
2no 28mm gate valves
1no 28mm NRV

Electrical Connections

All models require a 3-phase supply with standard electrical requirements as per table 3 Table 4 Electrical requirements

Electric data

Power supply| VAC / Ph / Hz| 400 / 3 / 50
Electric input (Peak)| kW| 9.1| 11.7| 15.1
Number of backup elements| –| 2| 2| 2
Back up element power (each)| kW| 3| 4.3| 6
Backup element power (total)| kW| 6| 8.6| 12
Maximum current (L1) – heat pump| A| 9.6| 9.6| 9.6
Maximum input (L2) – back up element 1 + controls + fans| A| 16.9| 22.5| 30.0
Maximum current (L3) – back up element 2| A| 13.0| 18.7| 26.1
Peak current| A| 39.5| 50.8| 65.7
IP-class| –| IPx4

Provision should be made for local isolation with a lockable isolator fitted on or very close to the heat pump. A single 230v plug socket should also be fitted close to the unit to aid commissioning and future maintenance.
Standard electrical connections available

Installation assistance

Lochinvar can supply expert assistance to designers and installers during all phases of construction, whilst the product is simple to install it is important that plantroom size and ventilation are correctly calculated before commissioning. See section Positioning on site for further details.

Frequently asked questions

Q1       Can Aquastore be fitted outside?
A1       No Aquastore is not electrically rated to be fitted outside, it must be fitted inside a plantroom or space. See section
Q2       Does the Aquastore have BMS Connectivity?
A2        Aquastore is a plug and play water heater and has no BMS connectivity Q3          What is the maximum working temperature of Aquastore?
A3        In efficiency or Hybrid more the maximum water heater temperature is 65˚C, in Power mode using the immersion heaters only the maximum working temperature is 85˚C
Q4       Why are the clearances around the unit so large?
A4        Clearances are required to ensure good airflow around the unit but crucially are required for service/ maintenance access to working parts.
Q5       Why is the Amps per phase not balanced?
A5        Aquastore is a single-phase unit but due to the high power required a three-phase supply is more suitable. Each phase supplies a 230v supply to different areas of the heat pump, see table 4 for details.