AIREDALE StoreMaster STM50R-P User manual

COVER
StoreMaster™
Air Handling Unit - Free Cooling,
Cooling & Heat Pump
50 kW - 77 kW
R410A
TECHNICAL MANUAL

STOREMASTER™
Comfort
2
Comfort Range
Technical Manual : 6678403 V1.7.0_ 11_2015
ABOUT AIREDALE
About Airedale Products & Customer Services
WARRANTY
All AIAC products or parts (non consumable) supplied for installation within the UK mainland and
commissioned by an AIAC engineer, carry a full Parts & Labour warranty for a period of 12 months
from the date of commissioning or 18 months from the date of despatch, whichever is the sooner.
Parts or Equipment supplied by AIAC for installation within the UK or for Export that are properly
commissioned in accordance with AIAC standards and specification, not commissioned by an AIAC
engineer; carry a 12 month warranty on non consumable Parts only from the date of commissioning
or 18 months from the date of despatch, whichever is the sooner.
Parts or equipment installed or commissioned not to acceptable AIAC standards or specification
invalidate all warranty.
Warranty is only valid in the
event that
In the period between delivery and commissioning the equipment: is properly protected & serviced as
per the AIAC installation & maintenance manual provided where applicable the glycol content is
maintained to the correct level.
In the event of a problem being reported and once warranty is confirmed as valid under the given
installation and operating conditions, the Company will provide the appropriate warranty coverage
(as detailed above) attributable to the rectification of any affected Airedale equipment supplied
(excluding costs for any specialist access or lifting equipment that must be ordered by the customer).
Any spare part supplied by Airedale under warranty shall be warranted for the unexpired period of
the warranty or 3 months from delivery, whichever period is the longer.
To be read in conjunction with the Airedale Conditions of Sale - Warranty and Warranty Procedure,
available upon request.
CAUTION
Warranty cover is not a substitute for maintenance. Warranty cover is conditional to maintenance
being carried out in accordance with the recommendations provided during the warranty period.
Failure to have the maintenance procedures carried out will invalidate the warranty and any liabilities
by Airedale International Air Conditioning Ltd.
SPARES
A spares list for 1, 3 and 5 years will be supplied with every unit and is also available from our
Spares department on request.
TRAINING
As well as our comprehensive range of products, Airedale offers a modular range of Refrigeration
and Air Conditioning Training courses, for further information please contact Airedale.
CUSTOMER SERVICES
For further assistance, please e-mail: enqui[email protected]m or telephone:
Customer Service s
UK Sales Enquiries
+ 44 (0) 113 238 7789
[e-mail]
International Enquiries
+ 44 (0) 113 239 1000
[e-mail]
Spares Hot Line
+ 44 (0) 113 238 7878
[e-mail]
Airedale Service
+ 44 (0) 113 239 1000
[e-mail]
Technical Support
+ 44 (0) 113 239 1000
[e-mail]
Training Enquiries
+ 44 (0) 113 225 1273
[e-mail]
For information, visit us at our Web Site: www.airedale.com
LegalN otic es
AIAC Ltd endeavours to ensure that the information in this document is correct and fairly stated, but
none of the statements are to be relied upon as a statement or representation of fact. AIAC Ltd does
not accept liability for any error or omission, or for any reliance placed on the information contained
in this document.
The development of Airedale products and services is continuous and the information in this
document may not be up to date. It is important to check the current position with AIAC Ltd at the
address stated. This document is not part of a contract or licence unless expressly agreed.
No part of this document may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, or information storage and retrieval systems, for
any purpose other than the purchaser’s personal use, without the express written permission of
AIAC Ltd.
2015 Airedale International Air Conditioning Limited. All rights reserved. Printed in the UK.

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Contents
Contents
GENERAL DESCRIPTION 4
Unit Identification ................................................................................................................... 4
Introduction............................................................................................................................ 4
Features................................................................................................................................. 5
Standard Features - General ................................................................................................. 6
Standard Features - General - Energy Saving 7
Standard Features - Evaporator Section................................................................................ 8
Standard Features - Evaporator Section - Energy Saving 11
Standard Features - Condenser Section.............................................................................. 12
Optional Extras - General..................................................................................................... 13
Optional Extras - Energy Saving 16
DESIGN FEATURES & INFORMATION 17
Energy Saving Features 17
Low Pressure Hot Water (Optional Extra)............................................................................ 19
System Pipework Schematic................................................................................................ 20
CONTROLS 23
General Description ............................................................................................................. 23
Display/Keypad.......................................................................Error! Bookmark not defined.
Temperature Control............................................................................................................ 23
Operation............................................................................................................................. 24
Monitoring............................................................................................................................ 26
Alarm Handling .................................................................................................................... 26
Standard Features ............................................................................................................... 27
Optional Features ................................................................................................................ 28
PERFORMANCE DATA 29
Capacity Data - Cooling Only Unit ....................................................................................... 29
Operating Limits................................................................................................................... 29
Capacity Data - Cooling & Heat Pump Unit.......................................................................... 30
`....................................................................................................................................
Fan Performance - Return Air.............................................................................................. 34
SOUND DATA 36
Measurement of Sound Data............................................................................................... 36
Sound Data.......................................................................................................................... 36
GENERAL SPECIFICATION 37
Mechanical Data - Cooling Only........................................................................................... 37
Mechanical Data - Cooling & Heat pump............................................................................. 38
Electrical Data - Cooling Only.............................................................................................. 39
Electrical Data - Heat Pump................................................................................................. 40
DIMENSIONAL DATA 41
Packaged Unit...................................................................................................................... 41
Split System......................................................................................................................... 42
INSTALLATION DATA 43
Positioning ........................................................................................................................... 43
Unit Lifting............................................................................................................................ 44
Weights (kg)......................................................................................................................... 44
Split System......................................................................................................................... 45
Electrical .............................................................................................................................. 46
Interconnecting wiring.......................................................................................................... 47

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Technical Manual : 6678403 V1.7.0_ 11_2015
General Description
UNIT IDENTIFICATION
STM
50
R
-
P
STM
StoreMaster
50 & 77
Model Size (Expressed as Nominal Cooling in kW)
R
Cooling
RHP
Cooling + Heat Pump
P
Packaged (Evaporator + Condenser Sections)
E
Evaporator Section
C
Condenser Section
INTRODUCTION
The Airedale range of StoreMaster fully packaged air cooled air conditioners covers the
nominal capacity range 50kW and 77kW in 2 model sizes.
Attention has been placed on maximising the unit’s performance while keeping the sound
and footprint to an absolute minimum.
The StoreMaster consists of 2 parts and evaporating section 1and a condensing section is
offered fully packaged as standard.
In applications where external space is restricted or sound levels are critical, the unit can
be supplied optionally as a split system. The Evaporator section can then be mounted
internally and piped to an externally mounted Condenser section.
Offering simultaneous DX Mechanical cooling and Free-Cooling operation, the range
utilises the latest technology to achieve a high level of energy efficient operation.
CE DIRECTIVE
Airedale certify that the equipment detailed in this manual conforms with the following
EC Directives:
Electromagnetic Compatibility Directive (EMC)
89/336/EEC
Low Voltage Directive (LVD)
73/23/EEC
Machinery Directive (MD)
89/392/EEC in the version 98/37/EC
Pressure Equipment Directive (PED)
97/23/EC
To comply with these directives appropriate national & harmonised standards have been
applied. These are listed on the Declaration of Conformity, supplied with each product.
Maximum and Minimum Operation Temperature (Ts) and Pressure (Ps)
Operating Temperature (TS), TS = Min -20°C to Max 120°C *
Maximum Operating Pressure (PS) PS = High Side 26 Barg
*Based upon the maximum machine running temperatures.
REFRIGERANT
The range has been designed and optimised for operation with ozone benign
refrigerant R410A.
1
Description relates to the heat exchangers function in cooling mode. When operating in heating on the heat pump
model the operation of the evaporator and condenser coils is reversed.

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FEATURES
COOLING ONLY
COOLING & HEAT PUMP
● Standard
○ Optional Extra
- Not available
Construction
Weatherproof Louvre To Fresh Air Intake And Exhaust Air (Packaged Unit Only)
●
●
Fresh Air Free Cooling Economiser - Outside Air Damper
●
●
Split Delivery - Condensing Section And Evaporator Section
Return Air Fans (AC) - Voltage Regulated Speed Control
●
●
Return Air Fans (AC) - Inverter Speed Control
Supply Air Fans- Electronically Commutated (EC)
●
●
Constant Supply Air Volume Control
Return Air Velocity & Volume Measurement
Filters - 97mm Pleated Disposable BS EN 779-G4
●
●
Condenser
Condenser Coils - Hydrophilic Coated
●
●
Coil Guards
Condenser Fans For Head Pressure Modulation - Voltage Regulated Speed Control
●
●
Condenser Fans For Head Pressure Modulation - Inverter Speed Control
Integrated Maintenance Friendly Drain Pan With Pad Heating
-
●
Refrigeration
Full Operating Charge Of R410A
●
●
Suction Gas Cooled Tandem Scroll Compressor With Internal Motor Protection, Pressure Relief, & Sump Heater
●
-
Suction Gas Cooled Scroll Compressor With Internal Motor Protection, Pressure Relief, Oil Sight Glass & Sump
Heater
-
●
Number Of Independent Refrigeration Circuits
1
2
Electronic Expansion Valve (EEV) - Evaporator
●
●
Thermostatic Expansion Valve (TEV) - Condenser
-
●
Liquid Line Sight Glass
●
●
Liquid Line Ball Valves
●
●
Liquid Receiver
-
●
Discharge Line Ball Valves
●
●
4 Way Reversing Valve
-
●
Suction Accumulator
-
●
Non-Return Valve
-
●
Manual Reset HP/LP Switch (LP Via Microprocessor)
●
●
Suction And Liquid Pressure Transducers
●
●
Leak Detection System
Heating
Indirect Gas Fired Heating
Electric Heating
Low Pressure Hot Water
-
Electrical
Emergency Stop
●
●
Interlocking Mains Door Isolator
●
●
Fan Speed Controllers And Valve Drivers
●
●
Electronic Soft Start
Maintenance Friendly 13A Double 3 Pin Plug Socket
Phase Monitoring & Protection
Controls
Microprocessor Controller
●
●
Remote Display
Inverter Drive Interface Display
Enthalpy Controls
Energy Manager
Air Quality Monitoring
BMS Interface Card

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General Description
STANDARD FEATURES - GENERAL
Construction
The base is fabricated from galvanised steel to ensure a tough, durable,
weatherproof construction.
Unit support can be provided by concrete/steel pillars to each corner of the rigid
steel base.
The superstructure is manufactured from galvanised sheet steel coated with epoxy baked
powder paint to provide a durable and weatherproof finish.
Standard unit colour is Light Grey (RAL 7035).
Compressors are mounted on a rigid galvanised heavy-duty sub frame. Fully
weatherproofed electrical panels are situated at one side of the unit. Access to all major
components sections of the unit are via either hinged or removable panels.
Construction includes duct flanges/mounts to accept self support ducting of up to 4m.
A set of removable 4 M24 collared lifting eye bolts to BS4278 are supplied.
Refer to Dimensional Data, on page 41 for unit layout.
Weather Louvres - Packaged
A weatherproof louvre is fitted to the fresh air intake and exhaust air as standard, to
protect internal components, complete with bird mesh.
Refer to Weather Louvres - Split System, on page 14 , for split system louvre arrangement.
Refrigeration
As standard the packaged unit is supplied with a full operating charge of R410A
refrigerant.
As standard the split unit is supplied with sufficient charge of R410A refrigerant to cover
5m of interconnecting pipe work. Refer to Split Delivery, on page 13 for split
case arrangement.
The cooling only unit has a single refrigeration circuit.
The Heat Pump unit has a two independent refrigeration circuits.
For further details, refer to System Pipework Schematic, on page 20.
Cooling Only Unit
EVAPORATOR SECTION INCLUDES:
Electronic expansion valve (EEV)
Liquid line sight glass
Discharge line ball valve
Large capacity filter drier
Low pressure switch with manual reset via microprocessor controller
High pressure switch with manual reset
Suction and liquid pressure transducers
CONDENSING SECTION INCLUDES:
Liquid line ball valve
5/16” Schrader for gauge connection

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General Description
STANDARD FEATURES - GENERAL - ENERGY SAVING
Refrigeration
Heat Pump Unit
EVAPORATOR SECTION INCLUDES:
Electronic expansion valve (EEV)
Liquid line sight glass
Discharge line ball valve
Large capacity filter drier
Low pressure switch with manual reset via microprocessor controller
High pressure switch with manual reset
Suction and liquid pressure transducers
Liquid Receiver
4 Way Reversing Valve
Suction Accumulator
Non-return valve
CONDENSING SECTION INCLUDES:
Thermostatic expansion valve (TEV) with external equaliser
Liquid line ball valve
Non-return valve
5/16” Schrader for gauge connection
Solenoid valve

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General Description
STANDARD FEATURES - EVAPORATOR SECTION
Coil
Large surface area coil(s) ideally positioned to optimise airflow and heat transfer,
manufactured from refrigeration quality copper cross hatched tubes with mechanically
bonded aluminium fins.
Coils are suitably positioned over a purpose made stainless steel drain tray.
Fins are coated with a non-stick acrylic film (hydrophilic) which provides additional
corrosion protection and efficient surface water removal for improved performance.
Cooling Only Unit
Single circuit.
Heat Pump Unit
Dual interlaced circuits optimised for heat pump application.
Fan & Motor Assembly -
Supply Air Fan
Electronically Commutated (EC) Fan Motor
Direct driven backward curved impeller plug fans with integrated 3-phase EC external
rotor motors are situated in an attenuated scroll housing that reduces discharge air and
case break out sound levels.
The high performance impeller is dynamically balanced with inlet ring to provide energy
cost savings due to the high efficiency of the assembly.
Fan speed, airflow and external static pressure are adjusted via the microprocessor
display which maintains optimum performance and offers easy on site adjustment.
For further details, please refer to Design Features & Information, on page 18.
An optional return air fan is available; refer to Return Air Fan, on page 14.
Filters
97mm pleated disposable panel filters in a rigid frame. Conform to BS EN 779-G4.
Access and removal from unit side.
An adjustable diaphragm pressure switch is fitted across the filter assembly to monitor
pressure drop which will initiate a filter dirty alarm.
On sites with high debris levels, it is recommended that an additional set of filters be
purchased for post commissioning operation, please specify at order.

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General Description
STANDARD FEATURES - EVAPORATOR SECTION
Compressor
Suction gas cooled scroll compressors comprising:
Internal motor protection
Internal pressure relief
Non return valve
External discharge temperature protection
Oil sight glass
Oil heater
The compressors are mounted to the rigid galvanised heavy duty sub-frame with the use
of vibration reducing isolation.
Cooling Only Unit
Single Tandem set on 1 circuit to provide 2 cooling stages.
Tandem pairs have an oil equalisation line.
Heat Pump Unit
Single compressor to each circuit to provide 2 cooling stages and 2 heating stages.
Head Pressure Control -
Intelligent Modulation
As standard the system is fitted with a voltage regulating fan speed controller which
allows set-point adjustment and system monitoring via the
microprocessor controller.
A pressure transducer is fitted to the liquid line which in turn feeds back the head
pressure to the microprocessor.
The head pressure can be monitored via the display keypad.
Cooling Mode
The outdoor fan speed can then modulate via the controller to provide optimum control
under varying ambient conditions.
With the head pressure factory set to 22 Barg (319 psig) part load, EER values are
significantly improved, which in turn lowers energy consumption.
Heat Pump Mode
The outdoor fan speed can then modulate via the controller to provide optimum control
under varying ambient conditions.
With the head pressure factory set to 35 Barg (508 psig) part load, EER values are
significantly improved, which in turn lowers energy consumption.
In heating mode head pressure is adjusted by regulating the evaporating pressure with
the outdoor axial fans.
Main Electric Isolator
To ensure complete unit isolation of the electrical panel during adjustment and
maintenance a door interlocking isolator is provided as standard.

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General Description
STANDARD FEATURES - EVAPORATOR SECTION
Electrical
Dedicated weatherproof electrical power and controls panels are situated at the side of
the unit and contain:
Door locking electrical isolation for mains compartment
Separate, fully accessible, controls compartment, allowing adjustment of control set
points whilst the unit is operational
Circuit breakers for protection of all major unit components
Fan speed controllers and valve drivers
The electrical power and control panel is wired to the latest European standards and
codes of practice.
CAUTION
A fused and isolated electrical supply of the appropriate phase, frequency and
voltage should be installed.
Controls
Units are fitted with the microprocessor controller which offers powerful
analogue and digital control to meet a wide range of monitoring and control features
including a real time clock and a communication port plus networking and
BMS connections.
A keypad/display assembly is used to view the unit status and allow operator adjustment.
For full details, please refer to the Controls, on page 25.

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General Description
STANDARD FEATURES - EVAPORATOR SECTION - ENERGY SAVING
Expansion Valves
Cooling Only Unit
IN COOLING MODE, ELECTRONIC EXPANSION VALVES (EEV):
Electronic expansion valves differ to the normal thermostatic expansion valves
in their ability to maintain control of the suction superheat at reduced
head pressures.
EEV step position, superheat setpoint, head pressure set point and other
features can be viewed and adjusted via the microprocessor display keypad.
Factory fitted, for full details refer to Design Features & Information.
Heat Pump Unit
IN COOLING MODE, ELECTRONIC EXPANSION VALVES (EEV):
Electronic expansion valves differ to the normal thermostatic expansion valves
in their ability to maintain control of the suction superheat at reduced
head pressures.
EEV step position, superheat setpoint, head pressure set point and other
features can be viewed and adjusted via the microprocessor display keypad.
Factory fitted, for full details refer to Design Features & Information.
IN HEAT PUMP HEATING MODE THERMOSTATIC EXPANSION VALVES (TEV):
Factory fitted, for full details refer to Design Features & Information.
Free Cooling Economiser
Facilitates free cooling operation.
Consists of motorised opposed blade aluminium dampers, fitted to each
Evaporator section as standard. There are 3 dampers of equal size per unit;
fresh air, exhaust air and mixed air. The dampers have been designed to allow
for 100% free cooling operation using the full design air volume.
1 Return Air
2 Exhaust Air
3 Fresh Air Supply
4 Mixing Section

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General Description
STANDARD FEATURES - CONDENSER SECTION
Coil
Large surface area coil(s) ideally positioned to optimise airflow and heat transfer,
manufactured from refrigeration quality copper cross hatched tubes with mechanically
bonded aluminium fins.
Fins are coated with a non-stick acrylic film (hydrophilic) which provides additional
corrosion protection and efficient surface water removal for improved performance.
Cooling Only Unit
As above.
Heat Pump Unit
As above.
Full width pull-out condensate tray with drain stub and pad heating.
Fan & Motor Assembly
Sickle bladed axial flow fan assemblies with integral long bellmouth and fingerproof grille;
and incorporating external rotor ac motor technology, to provide highly accurate
speed control.
Air is discharged vertically.
The fans offer maximum performance while keeping sound levels to a minimum.
Each fan is speed controllable and operates from a 3 phase electrical supply.
Optionally, speed control can be provided by energy efficiency inverter drives, refer to
Inverter Driven Axial Fans - Condenser & Return Air Fan Section, on page 16.

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General Description
OPTIONAL EXTRAS - GENERAL
Split Delivery
The evaporator section and condensing section can be delivered as a split system.
Cooling Only Unit
EVAPORATOR SECTION INCLUDES:
Holding Charge of Inert Gas
Sub Fusing for Condenser
Interconnecting sweat copper pipe connections
Shut Off Ball Valves
CONDENSING SECTION INCLUDES:
Precharged with R410A for approximately 5m of interconnecting pipework
Door Interlocking Isolator
Shut Off Ball Valves
Interconnecting sweat copper pipe connections
Heat Pump Unit
EVAPORATOR SECTION INCLUDES:
Precharged with R410A
Sub Fusing for Condenser
Interconnecting sweat copper pipe connections
Shut Off Ball Valves
CONDENSING SECTION INCLUDES:
Precharged with R410A for approximately 5m of interconnecting pipework
Door Interlocking Isolator
Interconnecting sweat copper pipe connections
Shut Off Ball Valves
The refrigeration pipework for split heat pump applications is based on a 3 pipe system. A
3 pipe system relies on the following refrigeration pipes between indoor and
outdoor sections
1 Liquid feed to TEV for evaporator coil in heat pump mode or;
Liquid feed to EEV for evaporator coil in cooling mode
2 Suction from evaporator coil in heat pump mode
3 Discharge from compressor in cooling mode

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General Description
OPTIONAL EXTRAS - GENERAL
Coil Guards
Guards can be fitted to each of the outer condenser coils to protect against damage.
Electronic Soft Start
The electronic soft start enables the unit compressor motor to be ramped to speed with
the minimum full load current. Further benefits include removal of nuisance tripping,
supply voltage dips and motor overheating.
Emergency Stop
Can be factory fitted to the electrical control panel of the evaporator section.
Return Air Fan
Direct driven speed controllable short case axial fan with efficient 3 phase rotor motor
technology and finger guard grilles. Factory fitted and located below the return air duct
aperture to ensure re-circulation of air in the conditioned space and powered exhaust air
during free cooling operation.
The system is fitted with a voltage regulating fan speed controller which allows set-point
adjustment and system monitoring via the microprocessor controller.
Optionally, speed control can be provided by energy efficiency inverter drives, refer to
Inverter Driven Axial Fans - Condenser & Return Air Fan Section, on page 16.
Constant Air Volume
Design to maintain system air volumes regardless of system pressure drops, in particular
where there is increased resistance due to dirty filters. In addition, commissioning set up
times are reduced. Operating air volume can be viewed via the microprocessor
display/keypad.
Supply Air Fan
Supply air fan speed can be modulated to maintain a constant air volume by the
differential pressure between the case and fan inlet ring being monitored via the unit
microprocessor.
The control signal to the supply air fans is automatically adjusted to maintain design unit
air volume.
Air Volume Adjustment
Designed to facilitate on site adjustment of the return air volume. In addition,
commissioning set up times are reduced. Operating air volume can be viewed via the
microprocessor display/keypad.
Return Air Fan
Return air fan speed can be manually adjusted to maintain a constant air volume via the
unit microprocessor by the fitting of a velocity sensor in the return air duct, supplied loose
for on site fitment.
Weather Louvres - Split
System
A weatherproof louvre is recommended for fitting to outdoor units with fresh air intake and
exhaust air, to protect internal components.
Complete with bird mesh.
R410A Leak Detection
System
A factory calibrated and fitted leak detection system fitted in the compressor section, will
raise an alarm when refrigerant gas is detected.

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General Description
OPTIONAL EXTRAS - GENERAL
Maintenance 13A
Socket
Double 13A three pin plug socket for unit maintenance only.
Heating Options
Electric Heating
Multi-stage finned electric heating elements complete with auto and manual reset
overheat cut-out protection, phase balanced for increased efficiency.
IMPORTANT
A separate mains incoming power supply is required with the electric
heating option.
or
Low Pressure Hot Water
(Cooling Only Units)
A low pressure hot water coil constructed of refrigeration quality copper tube and
mechanically bonded aluminium fins can be factory fitted.
Frost protection is fitted to prevent freezing of the low pressure hot water coil assembly.
Proportional heating control is provided by a factory fitted 3 port modulating valve.
A bypass balancing valve is fitted to aid commissioning and unit operation by creating the
same pressure drop through the bypass as through the LPHW coil.
Phase Monitoring Relay
A phase monitoring relay can be fitted; this offers protection for phase rotation, loss of
phase plus under and over voltage control.
Phase Rotation
Protection
A phase sequence relay is available for units containing 3 phase scroll compressors, to
prevent possible damage by running the compressor in the wrong direction.
Enthalpy Controls
The microprocessor can be programmed to calculate enthalpy values from the
combined temperature and humidity sensors fitted within each unit measuring return air
and ambient air conditions.
Enthalpy sensors will allow the microprocessor control to prevent high humidity fresh air
conditions entering the conditioned space.
Energy Manager
Analysis of system energy consumption can be monitored via a dedicated LCD display.
Unit parameters can be adjusted via the unit microprocessor control to affect energy
usage in line with the system needs. With the optional interface card fitted all information
from the energy manager can be monitored from a BMS.
Air Quality Monitoring
The main gases detected are, for what concerns the volatile organic compounds (VOC), a
mixture of the following gases; carbon monoxide CO2, sulphur water H2S, solvent
vapours, alkane vapours, cigarette smoke, car exhaust, air produced by human
breathing, combustion smoke from wood, paper and plastics. Additionally, the problem
detects the concentration of CO2from 350 up to 200 ppm.
The VOC mixture is displayed as a % from 0 - 100% via the microprocessor
keypad display.

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General Description
OPTIONAL EXTRAS - ENERGY SAVING
Inverter Driven Axial
Fans - Condenser &
Return Air Fan Section
ECA Approved
Inverter powered, variable frequency drives are fitted for optimum efficiency and
control of fan speed, maintaining a constant condensing pressure, allowing the
system to operate satisfactorily in ambient temperatures as low as -20°C, with
minimal fan input power.
Heating Options
Indirect Gas Fired Heating
ECA Approved
Factory installed indirect gas fired sealed combustion tubular heater with 2 stage
ON / OFF control as standard.
The split system Evaporator section is suitable for both externally and internally
located unit applications. For sealed plant room applications please refer
to Airedale.
IMPORTANT
Configured as standard suitable for outdoor application only, UNLESS
otherwise stated at time of order.
The 90kW tubular gas burner is constructed from aluminised steel, each tube
having rippled bends creating turbulence of combustion within, offering
optimum efficiency.
The burner assembly consists of a series of injectors. The gas-air mixture,
prepared in the burners, enables excellent combustion within the heat
exchanger tubes. Ignition of the combustible mixture is ensured by an electronic
ignition system and the burner is fitted with a blow back switch, an ignition
detection sensor and a flame detection sensor. The complete unit can be easily
removed for servicing or inspection, should it be necessary.
Gas isolation valve(s) must be supplied by others.
The units are designed and tested in accordance with the current European
CE Standards.

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Design Features & Information
ENERGY SAVING FEATURES
Free Cooling
The StoreMaster packaged unit has been designed to provide the cooling load
required whilst optimising energy efficiency at all times and as such will take
advantage of free cooling whenever available. If the free cooling available
cannot satisfy the required full cooling load, DX (mechanical) cooling is used to
supplement the output.
DX (Mechanical) Cooling
Cooling Only Unit
Cooling & Heat Pump Unit
2
3
4
5
10 20 30 40 50
STM50R
STM77R
2
3
4
5
10 20 30 40 50
STM50RHP
STM77RHP
EER
EER
Ambient °C
Ambient °C
1
Energy Efficiency Ratio (EER) is Unit Output Duty ÷ Unit Input Power.
2
Figures quoted at Room Conditions of 24°C / 50% RH Gross.
DX (Mechanical) Heating
Free Cooling
Cooling & Heat Pump Unit
Cooling & Heat Pump Unit
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
-15 -10 -5 0 5 10 15 20
STM50RHP
STM77RHP
0
5
10
15
20
510 15 20 25
STMR/RHP50
STMR/RHP77
EER
EER
Ambient °C
Ambient °C
1
Energy Efficiency Ratio (EER) is Unit Output Duty ÷ Unit Input Power.
2
Figures quoted at Room Conditions of 24°C / 50% RH Nett.

STOREMASTER™
Comfort
18
Comfort Range
Technical Manual : 6678403 V1.7.0_ 11_2015
Design Features & Information
ENERGY SAVING FEATURES
Electronic Expansion
Valves (EEV)
Using an EEV allows for good refrigeration control whilst operating at part load
and lower ambient conditions with a reduced condensing pressure. By fitting an
EEV and adjusting the head pressure control setting an increase in the system
EER (Energy Efficiency Ratio) of up to 30% can typically be seen. The
Mollier diagram shown below helps to illustrate how this increase in efficiency
is achieved.
EEV’s differ to normal thermostatic expansion valves in their ability to maintain
control of refrigerant flow and the suction superheat at reduced head pressures.
The turn-down rate of a typical EEV is superior to that of its thermostatic
equivalent, such that a reduced optimum condensing pressure can be
maintained at low compressor load. However low the load is on the compressor,
from zero to 100%, there will not be a problem with turn down, even down to
10% of the valve’s rated capacity.
1
2
3
4
A
B
Bubble
Dew
1
2
3
4
A
B
TEV
EEV
1 Compression
2 Condensation
3 Expansion
4 Evaporation
Reduced Condensing
Pressure
Pressure
(bara)
Evaporating Pressure
1
2
3
4
A
B
X
Y
Enthalpy
(kJ/kg)
1
2
3
4
A
B
X
Y
Increase in
Cooling Duty
Reduction in
Input Power
Key:
Cooling Cycle @ 22°C ambient with a conventional TEV fitted.
Cooling cycle @ 22°C ambient, demonstrating a typical EEV condensing temperature taking full advantage
of lower ambient air temperatures (below 30°C).
Electronically
Commutated (EC) Fan
Motor Option
EC motors are DC motors with integrated AC to DC conversion; this gives the
flexibility of connecting to AC mains with the efficiency and simple speed control
of a DC motor. The EC fan offers significant power reduction in comparison with
equivalent AC fan at both full and modulated fan speeds. The inbuilt EC fan
control module allows for fan speed modulation from 20-100%, a standard AC
fans modulating range is typically 40-100% of full fan speed.
The EC fan offers superior energy efficiency at full and reduced fan speed
compared to the equivalent ac fan motor.

Comfort
STOREMASTER™
Comfort Range
19
Technical Manual : 6678403 V1.7.0_ 11_2015
Design Features & Information
LOW PRESSURE HOT WATER (OPTIONAL EXTRA)
Cooling Only
Waterside Pressure Drop (kPa)
90
80
70
60
50
40
30
20
10
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Waterflow (l/s)
1
Includes valve and pipework.

STOREMASTER™
Comfort
20
Comfort Range
Technical Manual : 6678403 V1.7.0_ 11_2015
Design Features & Information
SYSTEM PIPEWORK SCHEMATIC
Cooling Only
1
TT
EEV
12
11
10
9
8
HPT
6a
6b
6b
6a
7
HP
TS
TS
4
4
M
M
3
3
LP
15
LPT
14
2
13
5
1 Evaporator Section (refer to Footnote 1, on page 4 )
2 Condenser Section (refer to Footnote 1, on page 4 )
3 Scroll Compressor - Tandem Set
4 Temperature Sensor
5 High Pressure Switch
6a Ball Valve
6b Ball Valve - Split Delivery Only
7 Condenser Section Coil & Fan
8 Head Pressure Transducer
9 Filter Drier
10 Sight Glass
11 Electronic Expansion valve (EEV)
12 Evaporator Section Coil & Fan
13 Temperature Transmitter
14 Low Pressure Transducer
15 Low Pressure Switch