Thermoscreens Air curtain system Installation, Operation & Maintenance Instructions Manual
T9901078-1 UK Page 1 of 36
VRF HP RECESSED HEAT PUMP RANGE AIR CURTAINS
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
For use with City Multi (VRF) systems
PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTI NG INSTALLATION
Thermoscreens Ltd
St. Mary’s Road Nuneaton
Warwickshire England
CV11 5AU
Email: sales@thermoscreens.com
Tel: +44 (0) 24 7638 4646
Fax: +44 (0) 24 7638 8578
www.thermoscreens.com
English
T9901078-1 UK Page 2 of 36
Thermoscreens / Mitsubishi Electric
City Multi (VRF) HP Recessed
Heat Pump Air Curtain System
CONTENTS
Page
Air Curtain System Schematics 3
Design Information 5
Unpacking the Air Curtain 8
INSTALLATION
Installation of the Air Curtain 10
Figure 1 – Dimensions of VRF HP R Air Curtain 12
Fitting the Recessed Grille 13
Mitsubishi Electric Compressor Unit 14
Refrigerant Pipework 14
To gain access inside the Air Curtain 15
Electrical Supply and Wiring to the Air Curtain 16
Wiring Diagram 1 (Defrost Cycle Auxiliary Heater disabled - as supplied) 18
Wiring Diagram 2 (Defrost Cycle Auxiliary Heater enabled on site) 19
PAR-30MAA Remote Controller 20
Wiring of Air Curtain Fan Speed 20
Condensate Disposal System 20
COMMISSIONING
Air Curtain Checks 22
Selecting the Fan Speeds of the Air Curtain 24
Starting the Heat Pump System 26
Filter Dirty Indicator 27
Hand-over to End-User 29
USER INSTRUCTIONS
User Instructions for the Air Curtain 30
SERVICING
Fortnightly Cleaning 31
Six Monthly Servicing 31
Fault Finding 34
T9901078-1 UK Page 3 of 36
Thermoscreens / Mitsubishi Electric
Thermoscreens HP City Multi (VRF) Heat Pump Air Curtains can be used with Mitsubishi
Electric City Multi Y/WY-Series (Heat Pump) or City Multi R2/WR2-Series (Heat Recovery)
systems.
City Multi Y/WY-Series Heat Pump Air Curtain System
City Multi Y/WY-Series Heat Pump Air Curtain Schematic :-
City Multi Y-Series System: Indoor Units and Air Curtains(s) all operate on heating at the same time, or all operate on
cooling at the same time.
The City Multi Y Series Heat Pump Air Curtain system consists of :-
one or more Thermoscreens VRF HP Heat Pump (heating and cooling) Air Curtains *
one or more Mitsubishi Electric City Multi Y/WY-Series Compressor Units +
a Mitsubishi Electric PAR-30MAA or PAR-F27MEA Remote Controller +
a door switch to change fan speeds; higher speed when the door is open, lower speed
when the door is closed (optional)
^
Mitsubishi Electric Indoor Unit(s)
+
[NB. Can be used on a full air curtain basis if required
up to 100% diversity]
* - supplied by Thermoscreens Ltd.
+
- Mitsubishi Electric items supplied by the installer
^
- supplied by the installer
Heat Pump
Air Curtain
Mitsubishi Electric
VRF Compressor Unit
M-Net Comms Link from
Compressor Unit
Permanent electrical supply
(from local switched spur)
Mitsubishi Electric
Mitsubishi Electric
PAR-30MAA
or PAR-F27MEA
Remote Controller
BMS
Control
On/Off
Mode change
Capacity control
3-Speed fan control
Temp. monitoring
Mitsubishi error
Refrigeration pipework
Electrical cables
Control cables
BMS Control
Door Switch to change fan speeds
Door open - High; Door shut - Low
(optional)
Permanent electrical supply (from local switched spur)
1-phase for air curtain as supplied,
3-phase only if defrost cycle auxiliary heater is needed
(site change then required to air curtain)
T9901078-1 UK Page 4 of 36
City Multi R2/WR2-Series Heat Pump Air Curtain System
City Multi R2/WR2-Series Heat Recovery Heat Pump Air Curtain Schematic :-
City Multi R2/WR2-Series System: Indoor Units and Air Curtains(s) can operate on heating or cooling simultaneously, e.g.
some indoor units are cooling whilst other indoor units and air curtain are heating at the
same time.
The City Multi R2/WR2-Series heat recovery system with Heat Pump Air Curtain(s) consists
of :-
one or more Thermoscreens VRF HP Heat Pump (heating and cooling) Air Curtains *
one or more Mitsubishi Electric City Multi R2/WR2-Series Compressor Units
+
Mitsubishi Electric BC Controller
+
a Mitsubishi Electric PAR-30MAA or PAR-F27MEA Remote Controller
+
a door switch to change fan speeds; higher speed when the door is open, lower speed
when the door is closed (optional)
^
Mitsubishi Electric Indoor Unit(s) + [NB. Can be used on a full air curtain basis if required
up to 100% diversity]
* - supplied by Thermoscreens Ltd.
+
- Mitsubishi Electric items supplied by the installer
^
- supplied by the installer
Permanent electrical supply (from local switched spur)
1-phase for air curtain as supplied,
3-phase only if defrost cycle auxiliary heater is needed
(site change then required to air curtain)
Heat Pump
Air Curtain
Mitsubishi Electric
VRF Compressor Unit
M-Net Comms
Link
Permanent electrical supply
(from local switched spur)
Mitsubishi Electric
BC Controller
BMS
Control
On/Off
Mode change
Capacity control
3-Speed fan control
Temp. monitoring
Mitsubishi error
Refrigeration pipework
Electrical cables
Control cables
BMS Control
Door Switch to change fan speeds
Door open - High; Door shut - Low
Mitsubishi Electric
PAR-30MAA
or PAR-F27MEA
Remote Controller
(optional)
T9901078-1 UK Page 5 of 36
DESIGN INFORMATION
AS SUPPLIED the air curtain operates on a 1 phase electrical supply (1L+N+E) from a local
switched spur which provides power for fans and controls. There is an integral defrost
cycle auxiliary heater located inside the air curtain but this is ‘disabled’ as supplied. If the
defrost cycle auxiliary heater is required the air curtain will then need a 3 phase electrical
supply (3L+N+E) from a local switched spur, instead of the 1 phase electrical supply, to
provide power for the heater as well which will need to be ‘enabled’ on site during
commissioning, see also notes on Page 6 and Section 'Installation - Electrical Supply and
Wiring to the Air Curtain', Page 16.
Electrical power to the Mitsubishi Electric Compressor Unit(s) and BC Controller is fed
separately in the normal way (see separate Mitsubishi Electric Instructions).
There is a Mitsubishi Electric M-Net communications link between the Mitsubishi Electric
Compressor Unit or BC Controller and the Thermoscreens Heat Pump Air Curtain. When
used with a Mitsubishi PAR-30MAA or PAR-27MEA Remote Controller this link provides:-
On/Off control of the Mitsubishi Electric heat pump system
Mode change between heating, fan only and cooling of the Mitsubishi Electric heat
pump system
Capacity control of the Mitsubishi Electric heat pump system
3-speed control of the Thermoscreens air curtain fans*
Temperature monitoring of the inlet air entering the air curtain, or the room air
temperature at the remote controller
Signal for when the outdoor unit is in defrost mode so a defrost cycle auxiliary heater
(if enabled) can provide partial heat back-up during the few minutes of defrost.
Error signal for if the Mitsubishi Electric system has a problem
* As an alternative a door switch can be used to switch between a higher fan speed with
the door open or a lower fan speed with the door closed.
The air curtain can be set to operate in HEAT, FAN or COOL mode within the Mitsubishi
Electric City Multi VRF system using a Mitsubishi PAR-30MAA or PAR-27MEA Remote
Controller or a Mitsubishi Electric BMS or Centralised Controller.
Refer to a Mitsubishi Electric agent if the air curtain is to be controlled via a Building
Management System (BMS) or Centralised Controller.
It should be noted that during heating mode, if the compressor unit goes into its defrost
cycle during cold weather, the air curtain fans will continue to operate to maintain the allimportant air stream across the doorway. It is this air stream, particularly towards the top of
the doorway, which is so effective at stopping buoyant warm air from inside the building
escaping to outside and wasting energy and also in reducing airborne contamination.
For Y-Series systems the temperature of the discharge air can be low during the defrost
cycle period that may occur every few hours under particular outdoor weather conditions
but this has rarely become an issue with the end user and is really only a perceived
problem. There is a defrost cycle auxiliary heater fitted in the air curtain which is disabled
when the air curtain is delivered. If there are concerns for a particular Y-Series installation
this defrost cycle auxiliary heater can be enabled during site commissioning and this will
maintain the discharge air at a higher temperature during the defrost cycle. A 3-phase
electrical supply is then required to power the air curtain.
T9901078-1 UK Page 6 of 36
NB. The defrost cycle auxiliary heater should not be site enabled during commissioning on
R2, WY and WR2 systems. On R2 systems the LEV in the air curtain closes during system
defrost and defrost does not occur on WY and WR2 systems.
Point of Information: If used, an auxiliary defrost heater may seem counter-productive for
a heat pump system. When put into context, however, the auxiliary heater fitted is of low
output for the size of the air curtain, it will just temper the discharge air and is only used for
a few minutes a day during a small period of the year. Tests at the Building Research
Establishment (BRE) test house on the heat pump air curtain system showed that even
with the auxiliary heater cutting in during defrost, as it has to during their EN14511
performance test, the annual seasonal COP was hardly affected.
The air curtain is supplied with an integral condensate drain tray fitted inside the unit so it
could be used in cooling mode during warm weather, if so desired. This should be decided
at the design stage as a condensate drain system will need to be installed if cooling is
required and extended to a suitable drain by the installer. The condensate can be drained
by gravity within the ceiling void by connecting suitable condensate hose onto the 15mm
drain pipe on the condensate drain tray inside the air curtain. If a gravity condensate drain
is not suitable it will be necessary to remove condensate using a condensate pump,
supplied and fitted by the installer. The condensate pump can be located inside the right
hand end of the air curtain or in a remote location outside of the unit if required. It must be
of sufficient capacity, see Page 21, self priming and capable of providing the appropriate
suction head so the pump will lift condensate out of the air curtain, particularly if it is in a
remote location. There are two hole penetrations at the right hand end of the air curtain for
condensate pipework to pass through, see Figure 1, Page 12. Suitable condensate pumps
are Peristaltic or Rotary Diaphragm type. We recommend the Blue Diamond rotary
diaphragm type with cooling signal sensor (drainStik) manufactured by Charles Austen
Pumps Ltd. (www.miniblue.co.uk).
If using a condensate pump it is recommended that it has the facility so it only operates
when the air curtain is in cooling mode by detection of water in the drain tray or by
detecting a cooling differential in the airflow. It should also have a pump overrun feature to
empty the drain tray as much as possible when the air curtain is switched off. It should
have an alarm system with appropriate sensor fitted in the drain tray that will give a voltfree signal (open circuit = alarm) and stop the air curtain cooling if the condensate drain
tray is in danger of flooding (air curtain fans will continue to operate). Other indoor units on
the same City Multi system are unaffected if the air curtain condensate alarm occurs.
There is a fixing bracket with 8mm diameter hole attached to the drain tray inside the air
curtain so a condensate sensor can be fixed in the tray by the installer. The hole can be
enlarged, if necessary, to suit the type of sensor used so it is located in the tray at the
appropriate position, see the manufacturer’s instructions that come with the condensate
pump for further information. A 230V AC, single phase electrical supply is provided inside
the air curtain to power a condensate pump and a condensate alarm connection is
provided for the condensate pump alarm circuit.
Warning: The air curtain condensate collection system is designed to remove condensate
with the air curtain operating in cooling mode during normal summer weather conditions in
countries with a temperate climate. In case of extreme weather conditions, drain tray
blockage or condensate pump failure, which can occur, it is vital that the design of the floor
beneath the air curtain and its surface is such that it will not become slippery or damaged if
it became wet. This is similar to the conditions that might be experienced with heavy
T9901078-1 UK Page 7 of 36
rainfall in at an open doorway or wet pedestrian foot traffic, so careful consideration must
be paid to the design of the floor and its surface finish.
If it is intended that the air curtain should not operate in cooling mode and a condensate
drain system is not fitted, the BMS System, Centralised Controller or PAR-30 MAA / PAR27 MEA Remote Controller must be configured at commissioning so that COOL or AUTO
mode can never be selected (see Section – Commissioning, Page 22). It is still
recommended, however, that the floor design and surface be as described above, in case
cooling mode is used in the future and also to cope with heavy rainfall or wet pedestrian
foot traffic.
Note: It could still be possible for an end user to unlock a PAR-30 MAA / PAR-27 MEA
remote controller if they found out how to and switch it into cooling, not realising that
condensate would then flood out of the drain tray. It may be considered prudent, therefore,
to install a condensate drain system even if it is intended that the unit should only be used
in HEAT or FAN mode.
The air curtain is designed only for use with a Mitsubishi Electric City Multi (VRF) system
for use on R410A. The complete Thermoscreens air curtain / Mitsubishi Electric heat pump
system, including fridge pipework, wiring, controls, etc. must be installed only by an
approved Mitsubishi Electric refrigeration contractor.
Persons using the air curtain must be given adequate instruction and supervision
concerning the use of the appliance by a person responsible for their safety. The air
curtain is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities.
These instructions must be read in conjunction with the separate Mitsubishi Electric
instructions that come with other components of the heat pump system, e.g. Compressor
Unit, BC Controller, PAR-30 MAA / PAR-27 MEA Remote Controller, BMS System,
Centralised Controller, etc. All instructions should be kept by the building facilities manager
for future reference.
T9901078-1 UK Page 8 of 36
UNPACKING THE AIR CURTAIN
The following items are supplied and packaged within the air curtain box :-
If anything is missing or damaged please contact your place of purchase immediately.
There will also be a 'City Multi (VRF) heat pump system' supplied by Mitsubishi Electric.
The Installer will also need to supply and install the following:-
The installer may also need to supply and install the following optional items:-
Condensate Pump – self priming with
cooling mode detection, alarm
system and pump overrun
If Air Curtain is to be operated in COOL or
AUTO mode and gravity drain cannot be used
– see text on Page 6 & 7 for more information
Door Switch – for energy efficient,
noise friendly, fan speed control,
Door open – Higher fan speed
Door shut – Lower fan speed
Gives industry standard fan speed control –see
wiring diagrams on Pages 18 & 19 and text on
Pages 20 & 24 for more information
Example Switch only
PAR-30 MAA or PAR-F27 MEA
Remote Controller
If Air Curtain is to be manually controlled,
also needed for commissioning
NB. The PAR-F27 MEA
Remote Controller
does not have a
timer/clock
V
RF Recessed Heat Pump Air Curtain
Air Inlet
Air Discharge
Recessed Grille with Filter
Air Discharge
A
ir Inlet
T9901078-1 UK Page 9 of 36
The complete Thermoscreens air curtain / Mitsubishi Electric heat pump system, to provide a
heat pump air curtain over a doorway, including wiring, fridge pipework, etc. is to be installed
only by an approved Mitsubishi Electric refrigeration contractor.
IMPORTANT
This Heat Pump Air Curtain is intended only for use with a Mitsubishi Electric City
Multi (VRF) system, for use on R410A.
These instructions must be read in conjunction with the separate Mitsubishi Electric
City Multi (VRF) instructions.
(All documentation supplied with the unit should be stored and kept for future reference.)
For your records:
Date of Purchase……………………………..
Place of Purchase…………………………….
Serial Number…………………………………
For warranty purposes proof of purchase is necessary so please keep a copy of your invoice.
T9901078-1 UK Page 10 of 36
Air Discharge
A
ir Inlet
DOORWAY
INSTALLATION OF THE HEAT PUMP AIR CURTAIN
The air curtain is designed to be recessed within ceiling voids or bulkheads within a
building and located horizontally over a doorway. It must not be installed outside of
the building.
Location
The air curtain must be mounted so the recessed grille
is located up to 3.8m maximum above floor level and
as close to the doorway as possible. The Air Discharge
section of the recessed grille must be nearest to the
doorway and the Air Inlet section furthest from the
doorway. The air curtain must be installed level or
condensate may leak out if used for cooling. Beware of
doorway top edges, structural beams, door
opening/closure devices, etc. which may interfere with
the air stream and affect the location of the unit.
Ensure there will be adequate clear space above the top of the unit within the ceiling void
to safely allow for pipework brazing operations.
Ceiling Suspension
Make the cut-out in the ceiling to the dimensions given
in Figure 1, Page 12, being as accurate as possible.
The air curtain can be manoeuvred straight up through
the ceiling cut-out. It may be necessary to notch the
ceiling cut-out in places to clear screws on the casing.
Alternatively the ceiling can be fitted after the air
curtain is installed. Bear in mind it will be necessary to
carry out pipework brazing operations above the air
curtain once it is located in position. Ensure there is
sufficient access and height clearance within the
ceiling void to do this.
Holes are provided in the top face of the casing (see Figure 1, Page 12 for positions) to
allow the unit to be suspended on M10 threaded rods (not provided). There are 4 hanging
points on the VRF HP1000R unit and 5 hanging points on the VRF HP1500R and VRF
HP2000R units - all hanging points must be used.
Air Curtain Weight (kg)
Number of
hanging points
VRF HP1000R DXE 52 4
VRF HP1500R DXE 75 5
VRF HP2000R DXE 93 5
There are two M10 hanging rods at each end of the unit (four in total) that enter the casing
from the top and attach to fixing brackets near the bottom of the unit (see picture above –
looking up into the air curtain). Use M10 lock-nuts either side of the fixing bracket to
secure the hanging rod. Do not let these four hanging rods come below the bottom of the
unit casing or they may prevent the recessed grille fitting properly.
M10
threaded
hanging
rods
Not to come
below casing
T9901078-1 UK Page 11 of 36
On the VRF HP1500R and VRF HP2000R units there is an additional hanging point
located towards the middle of the unit for an M10 hanging rod and this must be used.
Ensure each of the hanging rods is secured onto a suitable structure that can support the
weight of the unit (see Table on Page 10).*
Adjust the height of the unit on its hanging rods so the bottom surface of the casing goes
38mm up into the ceiling as shown in the diagram. Ensure the unit is level or condensate
may leak out if it is used for cooling.
CEILING LEVEL
38
CEILING LEVEL
38
Bottom surface of recessed
air curtain casing
M10 hanging rods
RECESSED AIR CURTAIN
* It is the sole responsibility of the installer to ensure that the building fixing locations and suspension system
used are suitable for the air curtain being installed.
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