Thermoscreens VRF PHV1000 DXE HO Guide

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 ATTEMPTING INSTALLATION
Thermoscreens Ltd
St. Mary’s Road Nuneaton
Warwickshire England
CV11 5AU
Email: [email protected]
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:
xFans
xDefrost electric heaters (if used)
xPAC-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:
xFans
xDefrost electric heaters (if used)
xPAC-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

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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 3-
row 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 Fixin
g
Bolts
Cit
y
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
A
ir 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

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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
5in. 8 3in. P100
VRF PHV1500 DXE LO 8
5in. 8 3in. P125
VRF PHV1500 DXE HO 8
5in. 8 3in. P140
VRF PHV2000 DXE LO 8
5in. 8 3in. P140
VRF PHV2000 DXE HO 4
3in. 8 3in. 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
p
anel

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 2.5mm2or 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 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
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)
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 5.6kΩresistor 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