Thermoscreens VRF PHV1000 DXE HO, VRF PHV1500 DXE HO, VRF PHV2000 DXE LO, VRF PHV1500 DXE LO, VRF PHV2000 DXE HO Installation, Operation & Maintenance Instructions Manual

9901035-1 Page 1 of 30

PHV SURFACE MOUNTED HEAT PUMP AIR CURTAINS

INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS

For use with CITY MULTI VRF units

PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTI NG INSTALLATION

Thermoscreens Ltd

St. Mary’s Road Nuneaton

Warwickshire England

CV11 5AU

Email: [e-mail]

Tel: [phone]
Fax: [phone]

www.thermoscreens.com

English

9901035-1 Page 2 of 30

Thermoscreens / Mitsubishi Electric

Thermoscreens City Multi 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 PHV Heat Pump (heating and cooling) Air Curtains *

• A Mitsubishi Electric PAC-AH…M-G AHU Controller or PAC-AH…M-H AHU Controller

(one for each air curtain) *

• A Mitsubishi Electric PAR-21MAA Remote Controller (one for each AHU Controller) +

• One or more Mitsubishi Electric City Multi Y/WY-Series Compressor Unit +

• Mitsubishi Electric Indoor Unit(s)

+

[NB. Can be used on a full air curtain basis if required

up to 100% diversity]

• Mitsubishi Electric BMS System or Centralised Controller, if required

+

* - supplied by Thermoscreens Ltd.;

+

- supplied by others

Heat Pump

Air Curtain

Mitsubishi Electric

Com

p

resso

r

Unit

LEV(s)

PAC-AH AHU

Controller

BMS Control

Fan

Sensors

Mitsubishi Electric

Indoor Units

Permanent electrical supply

(from local switched spur)

PAR-21MAA

remote

controlle

r

Defrost signal

Refrigeration pipework
Electrical/Controls cables

1 per air

curtain

Powe

r

Permanent mains electrical supply

(from local switched spur) for:

x Fans
x Defrost electric heaters (if used)
x PAC-AH…AHU Controller

Remote

3-Speed

Fan Switch

Cond. alarm

9901035-1 Page 3 of 30

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 PHV Heat Pump (heating and cooling) Air Curtains *

• A Mitsubishi Electric PAC-AH…M-G AHU Controller or PAC-AH…M-H AHU Controller

(one for each air curtain) *

• A Mitsubishi Electric PAR-21MAA Remote Controller (one for each AHU Controller)

+

• One or more Mitsubishi Electric City Multi R2/WR2-Series Compressor Unit

+

• Mitsubishi Electric BC Controller

+

• Mitsubishi Electric Indoor Unit(s)

+

[NB. Can be used on a full air curtain basis if required

up to 100% diversity]

• Mitsubishi Electric BMS System or Centralised Controller, if required +

* - supplied by Thermoscreens Ltd.; + - supplied by others

Heat Pump

Air Curtain

Mitsubishi Electric

Compressor Unit

Permanent mains electrical supply

(from local switched spur) for:

x Fans
x Defrost electric heaters (if used)
x PAC-AH…AHU Controller

PAC-AH AHU

Controller

BMS Control

Fan

Sensors

Mitsubishi Electric

Indoor Units

Permanent electrical supply

(from local switched spur)

PAR-21MAA

remote

controller

Defrost signal

BC Controller

Refrigeration pipework

Electrical/Controls cables

1 per air

curtain

LEV(s)

Remote

3-Speed

Fan Switch

Power

Cond. alarm

9901035-1 Page 4 of 30

DESIGN INFORMATION

Each Thermoscreens Heat Pump Air Curtain needs to operate with a Mitsubishi Electric

PAC-AH…AHU Controller. There are two versions that can be used; PAC-AH…M-G and
PAC-AH…M-H the supply of which is dependent on the EU state where the installation is

being carried out.

The rated size of the PAC-AH…AHU Controller needs to be matched to the size of the
heat pump air curtain. Each size of AHU Controller comes with different size LEV(s) and
number of LEVs so they need to be matched to the air curtain. The table shows the AHU
Controller to be selected and maximum outputs and air volume flow rates of the heat
pump air curtain.

Maximum Heat

Pump Output (kW)

Air Curtain

PAC-AH…AHU

Controller

LEV(s)
No.Off

Index Size

Heating Cooling

Air

Volume

Flow

(m3/h)

VRF PHV1000

DXE HO

PAC-AH125M-G

or

PAC-AH125M-H

Type P632411X01

1 off

P100

9.0 8.1 1400

VRF PHV1500

DXE LO

PAC-AH125M-G

or

PAC-AH125M-H

Type P632411X01

1 off

P125

10.6 9.0 2500

VRF PHV1500

DXE HO

PAC-AH140M-G

or

PAC-AH140M-H

Type P632414X01

1 off

P140

15.1 13.6 2600

VRF PHV2000

DXE LO

PAC-AH140M-G

or

PAC-AH140M-H

Type P632414X01

1 off

P140

16.4 14.8 3300

VRF PHV2000

DXE HO

PAC-AH250M-G

or

PAC-AH250M-H

Type P632411X01

2 off

P200

21.4 19.3 3130

Maximum heat pump output refers to the heating or cooling output from the air curtain air stream.
Figures are derived from laboratory testing with reference to test standard EN14511. They are with
the air curtain operating at high fan speed, outdoor air temperature 7/6°C db/wb indoor air
temperature 20°C db for heating; outdoor air temperature 35/27°C db/wb indoor air temperature 27°C
db for cooling. Contact Mitsubishi Electric for performance at other outdoor and indoor conditions.
The air curtain normally operates under automatic temperature control set on the PAR-21MAA remote
controller and can also run at part load.

The following City Multi compressor units can be connected:

For Y/WY-Series systems:

PUHY-(E)P200 …. 1250Y(S)HM-A
PQHY-P200 …. 600Y(S)HM-A
PUMY-P100 …. 140V(Y)HMB
PUHY-HP200 …. 500Y(S)HM-A

For R2/WR2-Series systems:

PURY-(E)P200 …. 800Y(S)HM-A
PQRY-P200 …. 600Y(S)HM-A

9901035-1 Page 5 of 30

The Thermoscreens Air Curtain requires a permanent mains electrical supply from a local
switched isolator. Electrical power to the PAC-AH…AHU controller is then fed from the air
curtain. Electrical power to the Mitsubishi Electric compressor unit(s) and BC Controller is
fed separately in the normal way (see separate Mitsubishi Electric instructions). If the
defrost cycle electric heaters inside the air curtain are to be used during the heating mode
defrost cycle the electrical supply to the air curtain needs to be 3-phase (3L+N+E). If the
defrost cycle electric heaters are not required they can be permanently disconnected at
installation and a single phase electrical supply (1L+N+E) fed to the air curtain instead,
see 'Installation - Electrical Supply'.

Warning: Air curtain fans continue to operate during heating mode system defrost to

maintain an air stream across the doorway. With the defrost cycle electric heaters
operating the discharge air temperature from the air curtain is kept to a few degrees below
that of the indoor ambient air temperature during the duration of system defrost. If the
electric heaters are disconnected, discharge air temperatures could be very cold,
approximately 6ºC during the defrost and defrost times will also be extended, particularly
with the R2-Series System. Defrost does not occur with WY and WR2 systems so the
defrost cycle electric heaters should be disconnected on these systems.

There are various control cables that are wired on site to the PAC-AH…AHU Controller
and the Thermoscreens Air Curtain that provide control for the operation of the unit. These
are:-

• Start/Stop of air curtain fans

• Operation of LEV(s) for control of heating or cooling output

• Thermistor sensors

• PAR-21MAA Remote Controller for end user manual control, if used

• On/Off of electric heaters inside the air curtain during system defrost (if used)

• Condensate alarm derived from condensate pump alarm sensor (if used)

• M-Net communications link to the Mitsubishi Electric Compressor Unit.

(see also wiring diagrams)

The Thermoscreens Air Curtain is supplied with an integral condensate drain tray to
enable the air curtain to be used in cooling mode during warm weather, if so desired. If it is
intended to use the air curtain in cooling mode a suitable condensate pump (not supplied
by Thermoscreens) must be supplied by the installer. The condensate pump must be of
sufficient capacity, self priming and capable of providing the appropriate suction head so
the pump will lift condensate out from the top of the air curtain but can be hidden in a
remote location if necessary. 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).

It is recommended that the condensate pump 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 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 that will give a volt-free signal (open circuit = alarm). This
will stop the air curtain cooling if the condensate drain tray is in danger of flooding, air
curtain fans will continue to operate. Other City Multi indoor units are unaffected if the air
curtain condensate alarm occurs. There is a plastic fixing bracket with 8mm diameter hole

9901035-1 Page 6 of 30

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. The 230v AC, single phase
electrical supply to operate the condensate pump will come from the air curtain.

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 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 rainfall or wet pedestrian
foot traffic at an open doorway, so careful consideration must be paid to the design of the
floor and its finish.

If it is intended that the air curtain should not be operated in cooling mode and a
condensate pump is not fitted, the BMS System, Centralised Controller or PAR-21MAA
manual Remote Controller must be configured at commissioning so that COOL or AUTO
mode can never be selected (see Section – Commissioning). 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 to cope with heavy rainfall or wet pedestrian foot traffic.

Note: It could still be possible for an end user to unlock a PAR-21MAA 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 therefore be considered prudent to install a condensate
pump and drain system even if it is intended that the unit should only be used in HEAT or
FAN mode.

If a Building Management System (BMS) or Centralised Controller is to be used for control
of the air curtain please contact Mitsubishi Electric for more details.

The air curtain is designed only for use with a Mitsubishi Electric City Multi VRF system for
use on R410A. The complete Thermoscreens/Mitsubishi Electric heat pump system,
including fridge pipework, wiring, controls, etc. must be installed only by an approved
Mitsubishi Electric refrigeration contractor.

The air curtain is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless they
have been given supervision or instruction concerning the use of the appliance by a
person responsible for their safety.

High Output (HO) and Low Output (LO) in this document refers to the heat pump heating
or cooling capacity of the Air Curtain, not to any electrical rating. HO air curtains have a 3­row coil, LO air curtains have a 2-row coil.

These instructions must be read in conjunction with the Mitsubishi Electric instructions that
come with other components of the heat pump system, e.g. Compressor Unit, BC
Controller, PAR-21MAA Remote Controller, BMS System, Centralised Controller, etc.
They should be kept by the building facilities manager for future reference.

9901035-1 Page 7 of 30

UNPACKING THE HEAT PUMP AIR CURTAIN

The following items are supplied and packaged within the Thermoscreens air curtain box.

The Mitsubishi Electric PAC-AH…M-G AHU Controller or PAC-AH…M-H AHU Controller
comes in its original Mitsubishi Electric box. It is delivered with the larger Thermoscreens air
curtain box. It is factory pre-wired as much as possible to reduce installation time on site.

Check with the cross-reference labels on the Thermoscreens air curtain box and the
Mitsubishi Electric AHU Controller box that the correct AHU Controller is matched with the
correct air curtain.

Other components for the heat pump system are as described above on the System
Schematics on pages 2 and 3.

Wall Brackets and Fixing Bolts

City Multi Heat Pump Air Curtain

Please note, end caps are supplied loose
to be fitted during installation

Remote 3-Speed Fan Switch

PAC-AH..M-G or M-H..AHU Controller

9901035-1 Page 8 of 30

The Installer will also need to supply and install the following:-

The following optional equipment is also available for the air curtain:-

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.

Sheet metal covers to hide services Fan Speed Controller for low speeds

Condensate Pump – self priming with
cooling mode detection, alarm
system and pump overrun

PAR-21 MAA Remote Controller

If Air Curtain is to be manually controlled,

also needed for commissioning

If Air Curtain is to be operated in COOL or

AUTO mode – see text for more information

9901035-1 Page 9 of 30

INSTALLATION OF THE HEAT PUMP AIR CURTAIN

The air curtain is designed to be surface mounted inside of the building and located
over a doorway. It must not be installed outside of the building, or built into a
cabinet or recessed in any way.

Location

The air curtain must be mounted so the discharge grille is
between 1.8m minimum and 3.75m maximum above floor
level and situated as close to the doorway as possible.
Beware of doorway top edges, structural beams, door
opening devices, etc. which may interfere with the air
stream and affect the location of the unit. The air curtain
must be installed level or condensate may leak out,
particularly if it tilts down at the left hand side (looking out
of the doorway from inside). It is better to tilt down slightly
at the right hand side as the drain tray spout is this side.

Wall Fixing

Bolt all of the wall brackets supplied to the rear face of the unit as shown in the adjacent
picture using the M6 bolts supplied. Suitable wall fixing bolts (not supplied) need to be
used to fix the brackets to the wall, taking into account the
type of wall and the weight of the unit*, see table:

Air Curtain Weight (kg)

VRF PHV1000 DXE HO 39

VRF PHV1500 DXE LO 59

VRF PHV1500 DXE HO 60

VRF PHV2000 DXE LO 78

VRF PHV2000 DXE HO 80

Step 1. Refer to Figure 1 for mounting details and drill the

fixing points in the wall.

Step 2. Screw in the top wall bolts leaving a small gap between the head and the wall.

Lower the unit onto the bolts via key-hole slots in the top of the wall brackets and then
screw in the bottom wall bolts.

Step 3. Ensure all fixing bolts are tightened and the air curtain is safely secured to the

wall.

Ceiling Suspension

M10 threaded inserts are provided in the top face of the
unit (see Figure 1 for positions) so it can be suspended on
M10 threaded hanging rods (not provided). All suspension
points 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 above)*. Screw the hanging

rods into the inserts by a minimum of 20mm and fit
locking nuts (not supplied) to prevent the rod rotating and
coming away from the casing. Do not screw the hanging
rod too far in or it will interfere with internal components.

* 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.

250mm min

9901035-1 Page 10 of 30

295

E E

D

C C

B

A

168

36

255

377

PHV2000DXPHV1500DX

22961746

18961400

1300

700

1824

948

650 912

A (mm)

B (mm)

C (mm)

D (mm)

E (mm)

Hot Gas

Refrigerant Connection

Liquid line

Refrigerant Connection

100

Electrical Supply and

Control Wiring Inlets

for pipes

250 min.

PHV1000DX

1196

800

800

N/A

N/A

Alternative holes for condensate hose

Optional sheet metal covers

to hide pipework, cables, etc.

250, 500 or 1000 high

Holes for M10 drop rods

4 for 1m unit, 6 for 1.5m/2m units

Use all drop rod holes !

FIGURE 1 – DIMENSIONS OF PHV HEAT PUMP AIR CURTAIN

9901035-1 Page 11 of 30

Refrigerant Pipework

This must be carried out before connection of any electrical and controls cables
and in accordance with the Instructions that come with the Mitsubishi Electric
City Multi equipment. This work must only be undertaken by a Mitsubishi Electric
approved Contractor.

Refrigerant installation pipework sizes need to be as follows :-

Air Curtain

Discharge Line

(Gas)

Liquid Line Index Size

VRF PHV1000 DXE HO

8

5

in.

8

3

in.

P100

VRF PHV1500 DXE LO

8

5

in.

8

3

in.

P125

VRF PHV1500 DXE HO

8

5

in.

8

3

in.

P140

VRF PHV2000 DXE LO

8

5

in.

8

3

in.

P140

VRF PHV2000 DXE HO

4

3

in.

8

3

in.

P200

NOTE: Contact Mitsubishi Electric for recommended pipework lengths, numbers of fittings etc.

The installation must be done in accordance with Mitsubishi Electric Service Manual.

It is intended that refrigerant pipe connections to the air curtain are made using brazed
joints and these must be carried out in a professional and safe manner. If installation
pipe sizes for the discharge (gas) line and liquid line are different from the pipe
connection sizes on the air curtain, suitable pipe reducers must be used for the
connection. R410A refrigerant systems can operate at pressures up to 610 psi (c. 42
Bar). These brazed joints may well be located in a public area and a weakness leading
to an explosion could be extremely dangerous. The air curtain with its coil is
manufactured in accordance with the Pressure Equipment Directive and the installation
must be carried out to a good standard of workmanship. Remove the protective plastic
film on top of the air curtain before starting work. Use a heat sink on the copper pipes
when brazing to reduce the transfer of heat to the inside of the air curtain where
sensitive components are located. Make sure the thermistor (gas) sensor has not been
inserted into its pocket on the gas pipe at the top of the air curtain before brazing.
Remove it if it has or it will burn when the pipe connection is brazed.

For the City Multi system the LEV needs to be brazed into
the liquid line as close as possible to the air curtain (2m
maximum). The picture shows an example of this. On the
VRF PHV2000 DXE HO there are two LEVs to be fitted in
parallel (see Mitsubishi Electric AHU Controller
instructions). If required the LEV(s) can be hidden away in
an adjacent void or above ceiling tiles, or the LEV(s) and
pipework can be hidden inside the optional sheet metal
services covers, see Page 8.

For the City Multi VRF R2 and WR2 Series system, pipework from each air curtain must
connect to one pair of ports on the Mitsubishi Electric BC Controller. The exception to
this is the VRF PHV2000 DXE HO air curtain that requires 2 pairs of ports on the BC
Controller to achieve the correct output. Do not combine pipework from two or more air
curtains together into one set of pipework and then connect this to one pair of ports.

NB: A maximum P140 Index is possible from 1 pair of ports, contact Mitsubishi Electric.

9901035-1 Page 12 of 30

To gain access inside the Air Curtain

To gain access for connection of the electrical supply, controls
wiring and to work on the unit during commissioning, remove the
air inlet grilles and the bottom access panel.

First remove the plastic end caps if already fitted by pulling off to
the side (see picture).

Then remove each inlet grille in turn with its filter by unfastening
the M4 Pozi Head screw at the bottom corner of the grille. Use a
Pozi No.1 screwdriver to access the screw via the elongated
hole at each bottom corner of the grille (see adjacent picture).

To remove the bottom access panel unfasten the access panel
securing screws, one at each end and two in the centre
(PHV1500 and PHV2000 units) and slide the panel out forwards.

Please note: All the panels of the air curtain are covered in a
protective plastic film which should now be removed.

Electrical Supply to the Air Curtain

This must be carried out AFTER the connection of the refrigerant pipework. All
electrical wiring and connections MUST be carried out by a competent qualified
electrician in accordance with the latest edition of the IEE wiring regulations
and/or local statutory regulations. (see also Wiring Diagrams on Pages 14 and 15)

• A local isolator having a contact separation of at least 3mm on all poles must be

fitted in the electrical supply to the air curtain and located in an accessible position
adjacent to the unit. 3 phase if defrost electric heaters are required. 1 phase if
defrost electric heaters are not required.

• The appliance must be connected using cables having an appropriate temperature

rating (heat resistant).

• Ensure that the supply cables, circuit breakers and other electrical installation

equipment are correctly sized for the air curtain being installed. See Table below.

• A 20mm size cable gland or conduit connector should be used for the Electrical

Supply into the air curtain.

• This appliance must be Earthed.

access panel

9901035-1 Page 13 of 30

400V/3ph/50Hz

if defrost electric heaters are required

230V/1ph/50Hz

if defrost electric heaters are not used

Air Curtain

Rated Electrical

Power Input (kW)

Rated Current per

phase (A)

Rated Electrical

Power Input (kW)

Rated Current (A)

VRF PHV1000 DXE HO

4.8 7.8 0.3 1.3

VRF PHV1500 DXE LO

7.8 12.7 0.35 1.8

VRF PHV1500 DXE HO

7.8 12.7 0.35 1.8

VRF PHV2000 DXE LO

9.5 15.7 0.5 2.7

VRF PHV2000 DXE HO

9.5 15.7 0.5 2.7

If the defrost electric heaters are not to be used they can be disabled by disconnecting
the neutral to the contactor coil inside the air curtain (see below and wiring diagrams on
Pages 14 & 15).

Note: If the defrost electric heaters are disconnected, discharge air temperatures could

be very cold, approximately 6ºC. Defrost times could also be extended, particularly with
the R2-Series System. *

Do not use cable size of more than 2.5mm2 or connection will be difficult.

See also wiring diagram on page 14 or page 15.

If the defrost electric heaters are to be disabled this can be done by disconnecting the

purple (neutral) wire from terminal A2 on the contactor inside
the air curtain. The disconnected purple wire should be
terminated safely into unused auxiliary terminal

14NO as

shown in the adjacent picture, or into a suitable terminal block.

*NB. Defrost does not occur with WY and WR2 systems so the

defrost cycle electric heaters should always be disconnected
on these systems.

The photo above shows the completed
wiring to terminals L1,L2, L3, N and
(Earth) for a 3 phase electrical supply
(400v/3ph/50Hz) if defrost electric
heaters are used

The photo above shows the completed
wiring to terminals L1, N and (Earth)
for a single phase electrical supply
(230v/1ph/50Hz) if defrost electric
heaters are not

used

9901035-1 Page 14 of 30

Local Electrical Supply for Defrost

Electric Heaters and Fans

VRF PHV1000 = 7.8A per phase

VRF PHV1500 = 12.7A per phase

VRF PHV2000 = 15.7A per phase

K1

K1

SITE WIRING

E

400V/3ph/50Hz

L1

L2 L3

N

Electrical Supply for

Outdoor Unit

400V/3ph/50Hz

or 230V/1ph/50Hz

OPTIONAL LOW SPEED CONTROLLER

1m unit 3 x 1.5kW = 4.5kW

1.5m unit 3 x 2.5kW = 7.5kW

2m unit 3 x 3.0kW = 9kW

If Defrost Electric Heating Elements

are not required disconnect purple wire

from A2 and terminate wire safely in

auxiliary terminal 14NO.

L2 and L3 are not then needed

L1 is then 230V/1ph/50Hz

1.3A for VRF PHV1000DX

1.8A for VRF PHV1500DX

2.7A for VRF PHV2000DX

Terminal 1 (Switched LIVE - Live only when air curtain is operating)

Terminal 8 (NEUTRAL)

Terminal 9 (EARTH)

Electrical supply for Condensate Pump, use:-

or, Terminal 7 (Permanent LIVE - Live at all times)

LINK-OUT if not

using 3-Speed Fan

Switch

(Medium Fan

Speed shown)

WIRING DIAGRAM – VRF PHV Heat Pump Air Curtain with PAC-AH…M-G AHU Controller

9901035-1 Page 15 of 30

K1

SITE WIRING

E

400V/3ph/50Hz

L1

L2 L3

N

Electrical Supply for

Outdoor Unit

400V/3ph/50Hz

or 230V/1ph/50Hz

OPTIONAL LOW SPEED CONTROLLER

1m unit 3 x 1.5kW = 4.5kW

1.5m unit 3 x 2.5kW = 7.5kW

2m unit 3 x 3.0kW = 9kW

Local Elect r ical Supply for Defrost

Electric Heaters and Fans

VRF PHV1000 = 7.8A per phase

VRF PHV1500 = 12.7A per phase

VRF PHV2000 = 15.7A per phase

Terminal 1 (Switched LIVE - Live only when air curtain is op erating)

Terminal 8 (NEUTRAL)

Terminal 9 (EARTH)

Electrical supply for Condensate Pump, use:-

or, Terminal 7 (Permanent LIVE - Live at all times)

LINK-OUT if not

using 3-Speed Fan

Switch

(Medium Fan

Speed shown)

K1

If Defrost Electric Heating Elements

are not required disconnect purple wire

from A2 and terminate wire safely in

auxiliary terminal 14NO.

L2 and L3 are not then needed

L1 is then 230V/1ph/50Hz

1.3A for VRF PHV1000DX

1.8A for VRF PHV1500DX

2.7A for VRF PHV2000DX

WIRING DIAGRAM – VRF PHV Heat Pump Air Curtain with PAC-AH…M-H AHU Controller

9901035-1 Page 16 of 30

Wiring to PAC-AH…AHU Controller and Controls Wiring

The Mitsubishi Electric PAC-AH…AHU Controller needs to be located
within 7m from the air curtain (cables are 8m long). It has four
mounting feet to fix it to a wall or alternatively it can be placed on a
horizontal flat surface if located in a compartment or ceiling void. It
comes pre-wired with various 8m long cables for power supplies,
thermistor sensors, LEV(s), alarms, etc. which have to be connected
to the air curtain. It can be hidden behind a nearby bulkhead or in an
adjacent room so it is out of view, although it must be accessible for
future service work if necessary. Each of the pre-wired cables has a
label attached to it at the end of the cable showing where it has to be
connected at the air curtain. The following table lists the connections to be made between
the PAC-AH…AHU Controller and the Air Curtain. Please note, there are two types of

AHU Controller, PAC-AH…M-G and PAC-AH…M-H, and wiring of some cables and

components is different for each type. This is indicated in the table below. See also wiring

diagram on Page 14 for PAC-AH…M-G, and Page 15 for PAC-AH…M-H.

Controller

Type

Termination at

PAC-AH…

Cable / Component Termination at Air

Curtain

M-G and M-H 8m 3-core cable pre-

wired to terminals E N L
POWER SUPPLY

Electrical power supply from air
curtain to PAC-AH… – 230v ac

wire to terminals 7 8 9

M-G and M-H 8m 2-core cable pre-

wired to terminals D1 D2
OPERATION SIGNAL

Operation signal from PAC-AH… to
start Air Curtain – 230v ac

wire to terminals 1 & 2

M-G and M-H 8m 2-core cable pre-

plugged into CN52 on
PAC-AH… pcb

Defrost signal from PAC-AH… to
operate contactor in air curtain for
defrost electric heaters if used

wire to terminals 5 & 6

M-G and M-H 8m 2-core cable pre-

wired to terminals
T21 T22 THERMISTOR
(GAS)

Thermistor (Gas) temperature
sensor – identified Black

Fit sensor bulb into Hot Gas
pocket on refrigerant gas
pipe at top of air curtain after
brazing pipe connections

M-G and M-H wire to terminals

T11 T12 THERMISTOR
(LIQUID)

Thermistor (Liquid) temperature
sensor – identified White

8m 2-core cable with sensor
bulb factory fitted within air
curtain

M-G only wire to terminals

T1 & T2 THERMISTOR
(INLET AIR)

Thermistor (Return Air)
temperature sensor – identified
Red

8m 2-core cable with sensor
bulb factory fitted within air
curtain

M-H only wire to terminals

T1 & T2 THERMISTOR
(OUTLET AIR)

Thermistor (Return Air)
temperature sensor – identified
Red

8m 2-core cable with sensor
bulb factory fitted within air

curtain
M-H only Terminals T31 T32 5.6kΩ resistor factory fitted Not Applicable
M-G and M-H 8m 6-core cable pre-

wired to 6-way colour
coded LEV terminals

Linear Expansion Valve(s) - LEV(s) Install in liquid line near to air

curtain

M-G and M-H 8m 2-core cable pre-

plugged into CN31 on
PAC-AH… pcb

Condensate alarm from condensate
pump alarm system,
open circuit = alarm and stops unit

Connect to condensate pump

alarm terminals which must

be volt free, open cct = alarm

9901035-1 Page 17 of 30

Remote 3-Speed Fan Switch

A remote 3-speed fan switch is supplied with the air curtain so the end user can remotely

select High, Medium or Low fan speeds to suit the local
conditions. The 3-Speed Fan Switch should be mounted on a
wall with the Mitsubishi Electric PAR-21MAA Remote Controller,
if used, so the end user will then have On/Off, temperature
control and fan speed control all from one location. The 3-speed
fan switch is wired to terminals FAN, HIGH, MED and LOW in
the Air Curtain using 230v mains rated, 4 core double insulated
cable of size 0.75mm2.

If the remote 3-Speed fan switch is not to be used, a permanent
wire link must be fitted across the fan terminals in the air curtain or
the fans will not operate when the system is started. This will
result in an error message from the compressor unit after a time.
The picture opposite shows a wire link fitted across terminals FAN
and MED and the air curtain would operate at Medium Fan Speed
whenever the heat pump system is switched on.

Note: Fan speed selection using the PAR-21MAA Remote Controller is not available. The

fan speed control logic within the PAC-AH…AHU Controller is not suitable for the
operation of an air curtain and so is not used.

The finished wiring to the air
curtain will be as shown in the
pictures opposite (wiring is
shown with a 3-phase electrical
supply for enabled defrost
heaters).

Note the use of 20mm conduit
with thermistor sensors and low
voltage cables in a separate
conduit to the mains rated
cables.

PAR-21MAA Remote Controller

If the air curtain is to be manually controlled by the end user a
Mitsubishi Electric PAR-21MAA remote controller (not supplied by
Thermoscreens) must be supplied and fitted by the installer. This is
wired to the PAC-AH…AHU Controller using 2-core cable. Refer to
the Mitsubishi Electric instructions that come with the PAR-21MAA
remote controller for installation and wiring of the controller.
A PAR-21MAA Remote Controller is also required for commissioning
purposes and if using AUTO mode with a BMS System or Centralised Controller.

M-NET Communications Cable

The M-NET communications cable is wired to the PAC-AH…AHU Controller in accordance
with Mitsubishi Electric instructions. Avoid isolators in the communications cables as this
can lead to transmission problems.

Sensors and

low voltage

cables

230v rated

cables

9901035-1 Page 18 of 30

Condensate Pump

If it is intended to use the air curtain in cooling mode a suitable condensate pump (not
supplied by Thermoscreens) must be supplied and fitted by the installer. The condensate
pump must be of sufficient capacity, self priming and capable of providing the appropriate
suction head so the pump will lift condensate out from the top of the air curtain. The
condensate pump can sit on the top of the air curtain or be hidden in a remote location if
necessary. 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).

It is recommended that the
condensate pump 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 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 that will
give a volt-free signal (open circuit = alarm). This will stop the air curtain cooling if the
condensate drain is in danger of flooding, bringing up error code 2502 or 2503, and the air
curtain fans will continue to operate. Other City Multi indoor
units are unaffected if the air curtain condensate alarm occurs.
There is a plastic 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. Enlarge the hole
if necessary to suit the sensor so it is located in the tray at the
appropriate position, see the manufacturers instructions that
come with the condensate pump for further information.

The 230v AC, single phase electrical supply to operate the condensate pump should come
from the air curtain (see wiring diagram). For a condensate pump with cooling mode start
and pump overrun, as recommended above, use Terminals:- 7 (Permanent Live), 8
(Neutral), 9 (Earth) which provides a permanent 5A fused supply. Terminal 1 (Switched
Live) can be used if a Switched Live is required. This will energise when the air curtain is
operating (Heat, Fan or Cool) and de-energise when it is switched off. This is also a 5A
fused supply.

The air curtain is supplied with a 1m length of 12mm bore plastic
hose ready fitted to the outlet spout of the drain tray. The plastic hose
can be found curled up inside the air curtain at the right hand side of
the unit. There are two holes in the casing, one at the top of the unit
and one at the rear, both fitted with rubber plugs (see Figure 1, Page

9). The plastic hose should be pushed through one of the these holes
after removing the plug and connected to the condensate pump using
the adapter supplied with the pump. It may be necessary to extend
the hose if the pump is remotely located. Whichever condensate exit
hole is used for the hose the condensate must be pumped away, it will not gravity drain via
the lower hole at the rear of the casing, the condensate must still be pumped away!

Air Curtain

Maximum likely

Condensate flow rate

(litres/hour)

VRF PHV1000 DXE HO

6.0

VRF PHV1500 DXE LO

7.0

VRF PHV1500 DXE HO

10.0

VRF PHV2000 DXE LO

11.0

VRF PHV2000 DXE HO

14.0

9901035-1 Page 19 of 30

Optional Sheet Metal Covers

Optional sheet metal covers are available to hide the various services
that enter the air curtain from above. They are available in sizes of
250mm, 500mm and 1000mm high and are supplied flat packed for
assembly on site. The sheet metal covers are secured to the top of
the air curtain via M6 screws into threaded inserts. They hide hanging
rods and all other services such as pipework, cables, condensate
pump, hoses, optional fan speed controller, etc. Two covers can be
fitted to PHV1000 units and three to PHV1500 and PHV2000 units
(see Figure 1, Page 9)

Optional Fan Speed Controller

An optional fan speed controller is available to provide a greater
range to the three fan speeds in the air curtain. Three fan speeds
are still used but the speeds can be reduced to lower levels than
the standard fan motor offers. The controller is useful if noise
levels are an issue on site as the fan speeds can be reduced
accordingly. The controller can be fitted to the air curtain
retrospectively. It does not fit inside the air curtain but comes with
2m cables so it can be hidden remotely from the unit or even
inside one of the optional sheet metal covers. Separate instructions come with the fan
speed controller showing how it is connected to the air curtain and commissioned.

9901035-1 Page 20 of 30

COMMISSIONING THE HEAT PUMP AIR CURTAIN

Ensure that the electrical supply to the Air Curtain is switched off before starting
any commissioning work.

Air Curtain Checks

Check that the components inside the air curtain are as shown in the picture below.
Check that the thermal overheat cut-out switch has not ‘tripped’. Push down on the red
button on the top of the thermal overheat switch - if it has tripped it will click back on.

Set the adjustable aluminium vanes of the discharge air grille so they point straight
downwards over the doorway.

A PAR-21MAA Remote Controller should be connected and
used to carry out commissioning even if the air curtain is to
operate under the control of a BMS System or Centralised
Controller. Disconnect the remote control plug from inside the
PAC-AH…AHU Controller to use the remote controller. Plug it
back in again if a BMS/Centralised Controller is to be used and
the PAR-21MAA is disconnected after commissioning.

NB. If the air curtain is used in AUTO mode under the control of

a BMS System or Centralised Controller it is necessary to also
have a PAR-21MAA Remote Controller connected.

Mitsubishi Electric Compressor Unit

For Y-Series systems ensure that the appropriate dip switch has been set in the
compressor unit so that the PAR-21MAA Remote Controller will operate in AUTO mode
and to enable Auto Re-Start after power failure if required.

PUMY-P model:- SW2-5 ON for AUTO mode
PUHY-P YHM and PQHY-P YHM model:- SW4-5 ON for AUTO mode

SW1-9 and SW1-10 on for Auto Re-Start after power failure.

Thermal
overheat
cut-out
switch

Air Inlet
Sensor
RED

Liquid Line
Sensor WHITE

12v DC & 230v AC

relays

Connections on
electric elements

9901035-1 Page 21 of 30

Mitsubishi Electric PAC AH…AHU Controller

Remove the access covers of the PAC-AH…AHU Controller and check that the dip
switch settings are correct for the controller. These need to be set as follows:

123

45

6

ON

OFF

SW2 (P100)

123

4

ON

OFF

SW7

123

45

ON

OFF

SW4

123

45

6

ON

OFF

SW3

7

8910

123

45

6

ON

OFF

SW1

7

8910

123

ON

OFF

SW8

VRF PHV1000DXE HO

123

45

6

ON

OFF

SW2 (P125)

VRF PHV1500DXE LO

123

45

6

ON

OFF

SW2 (P140)

VRF PHV2000DXE LO

123

45

6

ON

OFF

SW2 (P200)

VRF PHV2000DXE HO

VRF PHV1500DXE HO

Black rectangle indicates
moveable head of dip switch

These settings are the same for PAC-AH…M-G and PAC-AH…M-H AHU Controllers.

Starting the System

Carry out a final inspection to ensure that all wiring is in accordance with the wiring

diagram on Page 14 for a PAC-AH…M-G or Page 15 for a for PAC-AH…M-H and that

all connections have been properly made. Ensure that the refrigerant system is
complete, there are no leaks and there is sufficient charge of refrigerant R410A. Switch
on the electrical supply to the compressor unit and other City Multi system components.
Wait 30 seconds and switch on the electrical supply to the air curtain at the local
isolator. The system will boot-up and when the screen on the PAR-21MAA Remote
Controller becomes active it will repeat the message “PLEASE WAIT”. After several
minutes when the PLEASE WAIT message has stopped the system is ready to start.

DANGER: Beware of Fans Starting! Turn the air curtain on using the ON/OFF Button on

the PAR-21MAA Remote Controller and the air curtain fans will start straight away.
Switch the Mode Button on the PAR-21MAA to heating mode and adjust the target
temperature to 28°C maximum setting using the ▲TEMP Button. If the 3-Speed fan
switch is installed check that the fans run at Low speed, Medium speed and High speed
by operating the slider switch. Check there is no mechanical noise coming from the fans
at each of the three fan speeds and that all fans are working. If the 3-Speed fan switch
is not to be installed a wire link will have been fitted to the fan speed terminals on the air
curtain. Set the wire link to one of the three fan speeds (LOW, MED or HIGH)
appropriate to the site conditions (see also Page 17).

Check Heating and Cooling Performance

In heating mode check that the air stream from the discharge grille warms up across the
whole length of the air curtain after approximately 20 minutes of operation and that the
air stream reaches right down across the doorway with the door open or closed. If
necessary the aluminium vanes of the discharge grille can be angled either inwards or
outwards if this gives better penetration/warming of any incoming draughts. The fan
speed can also be adjusted (High, Medium or Low) to suit the conditions. If an optional

9901035-1 Page 22 of 30

fan speed controller has been installed it may be necessary to re-set the voltage
tappings on the transformers inside the fan speed controller to achieve a compromise
between airstream performance and noise levels. This is explained in the instructions
that come with the optional fan speed controller.

If it is intended that the air curtain is to ever operate in cooling mode switch the Mode
Button on the PAR-21MAA remote controller to ‘COOL’ and adjust the target
temperature to 14°C minimum setting using the ▼TEMP Button. Wait for the air curtain
air stream to go cold. Check the inside of the drain tray is clean, there is no debris in the
outlet spout, there are no kinks in condensate hoses and the condensate pump will
operate. It is unlikely that condensate will fill the drain tray straight away so it will be
necessary to fill the tray manually with water to see if the condensate removal system is
working satisfactorily. If an alarm sensor is fitted in the drain tray, check it operates to
stop the air curtain cooling if the drain tray becomes too full. Test the air curtain for a
time in cooling mode with all the panels and grilles fitted and if environmental conditions
permit check that condensate is being collected and pumped away by the condensate
pump. No condensate should leak out of the air curtain. At the end of the cooling test
remove the inlet grilles and the bottom access panel and check that the inside of the air
curtain has remained dry and that all condensate was collected by the removal system.

To conserve energy and carbon resources it is recommended to set up the BMS
System, Centralised Controller or PAR-21MAA Remote Controller so it can operate in
AUTO Mode at a target temperature of 24°C. This is the normal mode of operation for
the heat pump air curtain and it should run in this set-up with no further adjustments,
automatically heating or cooling as required. If the end user is to operate the air curtain
with a PAR-21MAA Remote Controller set up the No.1 locking function on the controller
so they can only switch the air curtain ON or OFF, with no control of mode or target
temperatures. See user instructions for the Mitsubishi Electric PAR-21MAA Remote
Controller.

BEWARE: It is possible for the air curtain to go into cooling mode on a warm day if the

BMS System, Centralised Controller or PAR-21MAA Remote Controller is set in AUTO
mode as described above. A condensate pump and drain system must therefore be
fitted if the air curtain is set in AUTO mode.

If it is intended that the air curtain should only operate in heating mode, never in cooling
mode, the PAR-21MAA Remote Controller must be set to HEAT mode with an
appropriate heating target temperature (say 24°C) and locked so only the ON/OFF
function on the Remote Controller works. If it is to be operated from a BMS System or
Centralised Controller this should be configured such that the air curtain can only
operate in HEAT or FAN mode, never in AUTO or COOL mode. It is important this is
done at commissioning if the air curtain is not to operate in cooling mode and is not
fitted with a condensate pump and drain system.

9901035-1 Page 23 of 30

Filter Dirty Indicator

The air curtain is fitted with a Filter Dirty Indicator. It is located at
the left-hand end of the outlet grille and signals when the air curtain
inlet grille/filters should be vacuum cleaned or the air curtain
requires servicing.

NB. The filter dirty indicator on the PAR-21MAA Remote Controller

does not function wired to a PAC-AH…AHU Controller.

The indicator states are outlined below:

Indicator State Indicator Light Action Required Reset Button

GREEN FLASH On 0.5s; Off 3s None N/A

RED ON On permanently Vacuum inlet Quick reset

RED FLASH On 0.5s; Off 0.5s Service filters Press for 5s

The filter indicator schedule is based on fan operating hours. For the default schedule,
shown schematically below, the inlet grilles should be vacuum cleaned every 120hrs of
fan operation (every 1 to 2 weeks) and a full filter service should take place every
480hrs of fan operation.

The factory set default schedule is suitable for most applications. However, the actual
frequency of cleaning required will depend on the environment. Two alternative indicator
schedules are available, and can be selected by changing the ‘jumper’ position (marked
1, 2 or 3) on the Filter Indicator pcb.

Filter Indicator Schedule

Double-

frequency

Default

Half-

frequency

Jumper position

Inlet grille vacuum interval 60 hrs 120 hrs 240 hrs

Filter service interval 240 hrs 480 hrs 960 hrs

1

23

• • • •

123

• • • •

1 2

3

• • • •

START

120 hrs

120 hrs

120 hrs

120 hrs

480 hrs

RED ON: Quick reset

RED ON: Quick reset

RED ON: Quick reset

RED FLASH: Hold 5s to reset

Fan operating hours

9901035-1 Page 24 of 30

To access the Filter Indicator pcb to change jumper:-

Switch off the electrical power to the Heat Pump Air Curtain.
If the left-hand plastic end cap is already fitted, remove it
from the air curtain. Unfasten the two screws as indicated.

Gently lower the left-hand end of the outlet grille, supporting
it from below. The Filter Indicator pcb is now accessible to
change the jumper.

Once the filter indicator pcb ‘jumper’ has been re-positioned,
push the outlet grille back into place and fasten screws.

Hand-over to End-User

Before leaving site it is important that there is a 'Hand-Over Meeting' to hand-over the
heat pump system and air curtain installation to the end user or their representative.
This should include a full and clear explanation of how the system operates. Be sure to
explain the Filter Indicator Schedule, that the air inlet grilles must be regularly vacuum
cleaned and the unit serviced at regular intervals.

If the air curtain is to be operated under manual control, it is important that the end user
understands how the Mitsubishi Electric PAR-21MAA Remote Controller and 3-Speed
Fan Switch operate. That the PAR-21MAA Remote Controller has been locked so only
the ON/Off button functions and the air curtain operates in AUTO mode with a fixed
target temperature of 24°C. If a condensate pump and drain system has not been fitted
it is vital they understand that the air curtain must not be run in COOL or AUTO mode
and that the PAR-21MAA Remote Controller has been locked so only the ON/Off button
functions and the air curtain operates only in HEAT mode with a fixed target
temperature of 24°C.

If the air curtain is to be operated under the control of a BMS System or Centralised
Controller, explain all the settings and demonstrate the operation of the system. If a
condensate pump and drain system has not

been fitted it is vital they understand that
the air curtain must not be run in COOL or AUTO mode, that it must only be operated in
HEAT or FAN mode.

If a condensate pump and drain system has been fitted and they are going to run the air
curtain in COOL mode (not just AUTO mode) explain that the target temperature should
be adjusted to a comfortable level of cooling, not necessarily to the lowest target
temperature possible as this uses a lot more energy and carbon resources.

Ensure that all instructions and manuals are handed to the end user or their
representative.

Fixing

screws

Jumper

9901035-1 Page 25 of 30

USER INSTRUCTIONS FOR THE AIR CURTAIN

For manual control using a PAR-21MAA Remote Controller

To Switch On and Off:

Turn the air curtain on by pressing the ON/OFF Button on the PAR-21MAA Remote
Controller and the air curtain fans will start within a few seconds. If a 3-Speed Fan
Switch is fitted adjust the fan speed to suit using the slider switch. As set up by the
Commissioning Engineer the air curtain will operate in AUTO mode, automatically
heating or cooling as required, with a target temperature of 24°C - all other buttons on
the Remote Controller are locked out.

NB. The air curtain may produce condensate during hot weather so a condensate

pump and drain system must be fitted!

Turn the air curtain off by pressing the ON/OFF Button on the PAR-21MAA Remote
Controller and the air curtain fans will stop.

If the PAR-21MAA Remote Controller is not locked the following functions operate:-

HEAT Mode:

Press the Mode Button on the Remote Controller until HEAT appears on the display.
Adjust the target temperature using the ▲ or ▼ TEMP Button between 22°C and 28°C
maximum. Allow time for the air stream to heat up.

AUTO Mode (only if condensate pump and drain system fitted!!):

Press the Mode Button on the Remote Controller until AUTO appears on the display.
Adjust the target temperature using the ▲ or ▼ TEMP Button to 24°C. This is the
normal mode of operation for the heat pump air curtain and it should run in this set-up
with no further adjustments, automatically heating or cooling as required.

FAN Mode (Fan only - no heating or cooling):

Press the Mode Button on the Remote Controller until FAN appears on the display.

COOL Mode (only if condensate pump and drain system fitted!!):

Press the Mode Button on the Remote Controller until COOL appears on the display.
Adjust the target temperature using the ▲ or ▼ TEMP Button between 20°C and 14°C
minimum. Allow time for the air stream to chill. Do not necessarily use the lowest target
temperature possible as this uses a lot more energy and carbon resources.

The temperature of the air returning to the air curtain is constantly displayed on screen.

PAR-21MAA

Remote Controller

3-Speed

Fan Switch

9901035-1 Page 26 of 30

SERVICING THE HEAT PUMP AIR CURTAIN

Vacuum Clean the Air Inlet Grilles / Filters

(Weekly, or when the Filter Dirty Indicator shows PERMANENT RED)

With the air curtain switched OFF, a vacuum cleaner with an
extension tube and brush attachment at its end should be used
to clean the face of the air inlet grilles/filters. This is important
to minimise the build-up of dust and lint on the air filters which
will affect the performance of the air curtain. This is a simple
service task that can be carried out by the Cleaner or Janitor
on a weekly basis from floor level without having to access the
air curtain at high level. This should be done weekly as a
regular service task and/or when the Filter Dirty Indicator
shows permanent red. Reset the Filter Dirty Indicator after
cleaning by a quick press of the Reset Button (even if the indicator has not gone red).

Servicing the Air Curtain

(suggest every 3 Months, or if the Filter Dirty Indicator shows FLASHING RED)

Always disconnect and isolate the mains electricity supply both at the local
electrical supply to the Air Curtain and to other Mitsubishi Electric equipment in
the City Multi system before servicing, maintaining or repairing the Air Curtain.

Note: All servicing, maintenance and repairs to the air curtain must be carried out by a

Thermoscreens approved Service Agent. It may be necessary to involve a
Mitsubishi Electric Service Agent if any work is to be carried out on the Mitsubishi
Electric City Multi heat pump refrigeration system and its controls.

Remove the plastic end caps by pulling
off to the side as shown.

Remove each Air Inlet Grille with its air
filter by unfastening the M4 Pozi Head
screw at the bottom corner of the grille.
Use a Pozi No.1 screwdriver to access
the screw via the elongated hole at the
bottom corners of the grille (see picture).

Remove the air filters from the air inlet
grilles by gently prizing them free as
shown. Vacuum clean and refit the filters
into the curved air inlet grilles. The filters
are very durable but may need to be
replaced after a number of service
intervals.

Remove the bottom access panel by
unfastening the panel fixing screws (2 on
PHV1000, 4 on PHV1500 & 2000 units ­see picture) and sliding panel out
forwards. Clean the inside of the panel.

Bottom Access Panel

9901035-1 Page 27 of 30

Vacuum clean and remove any build-up of dust, dirt and debris within the air-curtain,
especially on the face of the coil and the electric heating elements.

Note: Fan motors are permanently lubricated and require no additional lubrication.

The drain tray now angles down along its front edge and the
inside surface of the tray can be easily cleaned. Remove all
debris from the drain tray, outlet spout and condensate hose.

Check there are no kinks in condensate hoses. If the condensate
pump is a peristaltic type change the rubber pump head tube.

Once the air curtain has been cleaned, visually inspect the air curtain components.
Ensure pipe sensors are located in their pockets and any foam insulation covering these
pockets is un-damaged. Check the location of the thermal overheat cut-out and air
sensor and that the thermal overheat cut-out switch has not tripped (see Section ­Commissioning). Check all electrical connections and terminals within the unit are tight
and that crimp connections have not become loose.

Refit the drain tray, bottom access panel and air inlet grilles/filters. Switch on the
electrical supplies and fully function test the air curtain to ensure correct operation (see
Section - Commissioning). Check the condensate pump operates, if fitted.

Reset the Filter Dirty Indicator after the service by pressing the Reset Button for at least
5 seconds (even if the indicator has not gone flashing red).and hand back the unit to the
end user.

Loosen by 3 turns, the rear row of
drain tray fixing screws along the
whole length of the tray. Do not
remove these screws completely.

Remove the front row of drain tray
fixing screws along the whole
length of the drain tray. Keep the
screws.

9901035-1 Page 28 of 30

Fault Conditions

If the Thermoscreens Heat Pump Air Curtain System does not operate as expected refer
to the fault finding table below:

Symptom Possible Cause Action Required

Electrical power is not switched on to
the Mitsubishi Electric City Multi system
and at the local electrical isolator next to
the Thermoscreens Air Curtain

Switch on power to all
components in the heat pump
system and wait 30 seconds

Air curtain is not switched On

Switch on air curtain using the
PAR-21MAA Remote
Controller, BMS System or

Centralised Controller
Air Curtain fans are not wired to operate
with either a 3-Speed Fan Switch or a
wire link on fan terminals in air curtain

Wire in 3-Speed Fan Switch or

wire link – see wiring diagram

Air curtain

fans do not

operate

Problem with air curtain fan motor(s), or
internal wiring, or controls

Use wiring diagram to

investigate possible cause of

fault
Air curtain has been running for less
than 20 minutes and is still warming up
or cooling down

Give system sufficient time to

reach operating condition

Air curtain is set to Fan-Only on PAR­21MAA Remote Controller, BMS
System or Centralised Controller

Check schedule on Controller

and amend if necessary

Target temperature is set incorrectly,
i.e. too low for heating or too high for
cooling

Adjust the target temperature

on the BMS System,

Centralised Controller or PAR-

21MAA Remote Controller

The operating mode is set incorrectly,
i.e. set on COOL when heating is
required

Select the correct mode for the

conditions on the BMS

System, Centralised Controller

or the PAR-21MAA Remote

Controller

Condensate Alarm circuit is open circuit
and air curtain will not COOL

Rectify alarm circuit which

must be closed circuit for air

curtain to operate in cooling

Air curtain
discharge air
stream is not

heating or
cooling when

required

Air Curtain filters and/or coil is dirty.

Service air curtain as
described in Section -

Servicing
Error Code 2502 or 2503 indicating
condensate alarm from condensate
pump alarm system

Inspect air curtain condensate

tray and condensate pump,

service or repair if necessary

Mitsubishi

Electric

system is

indicating an

error code

A variety of error codes can occur
because of a fault within the air curtain

Refer to Mitsubishi Electric

Service Manual to understand

fault, then inspect and repair

air curtain if there is a fault

If the Heat Pump Air Curtain system is still not operating correctly call for a Mitsubishi
Electric Service Agent.

9901035-1 Page 29 of 30

Warranty

If any problems are encountered with the heat pump air curtain please contact your
Mitsubishi Electric Service Agent.

Care has been taken in compiling these instructions to ensure they are correct, although
Thermoscreens Ltd. disclaims all liability for damage resulting from any inaccuracies
and/or deficiencies in this documentation. Thermoscreens Ltd. retain the right to change
the specifications stated in these instructions.

Thermoscreens Ltd
St. Mary’s Road Nuneaton
Warwickshire England
CV11 5AU

Email: [e-mail]
Tel: + 44 (0) 24 7638 4646
Fax: + 44 (0) 24 7638 8578

www.thermoscreens.com

9901035-1 Page 30 of 30

EC DECLARATION OF CONFORMITY

as defined by the EC Council Directive on Machinery 2006/42/EC, the Low Voltage Directive 73/23/EEC,

the Electromagnetic Compatibility Directive 89/336/EEC and the Pressure Equipment Directive 97/23/EC

Herewith we declare that the air movement equipment designated below, on the basis of its design and
construction in the form brought onto the market by us in accordance with the relevant safety, health and
performance requirements of the Machinery.

If alterations are made to the machinery without prior consultations with us, this declaration becomes invalid.

Designation of Equipment : THERMOSCREENS AIR CURTAINS with CITY MULTI SYSTEM
Series Type : VRF PHV1000DXE HO, VRF PHV1000RDXE HO, VRF PHV1500DXE LO,

VRF PHV1500RDXE LO, VRF PHV1500DXE HO, VRF PHV1500RDXE HO,

VRF PHV2000DXE LO, VRF PHV2000RDXE LO, VRF PHV2000DXE HO
VRF PHV2000DXE HO

Relevant EC Council the Machinery Directive (2006/42/EC)
the Low Voltage Directive (73/23/EEC as amended by 93/68/EEC)
the Electromagnetic Compatibility Directive (89/336/EEC as amended by

91/31/EEC and 93/68/EEC)

the Pressure Equipment Directive (97/23/EC)

Applied Harmonised Machinery - EN 292-1, EN 292-2, EN 294, EN 394, EN 414
Standards : LVD - EN 60335-1, EN 60335-2-30, EN 60335-2-40

EMC - EN55011, EN 61000-3-2, EN 61000-3-3, EN 61000-4-2,

EN 61000-4-4, EN61000-4-5, EN61000-4-11, EN61000-6-4

PED - EN 13134, EN 13133
Basis of Self Attestation : Quality Assurance to BS EN ISO 9001 : 2000

B.S.I. Registered Firm Certificate Number FM 85224

Responsible Person : Mr. M. Francis, Managing Director, Thermoscreens Limited
Date : 17th June 2009

Signed :

Thermoscreens Ltd
St. Mary’s Road
Nuneaton
Warwickshire
CV11 5AU
United Kingdom
Telephone: [phone]
Fax: [phone]