Vent-Axia Sentinel Owner's manual

Copyright © 2009 Vent-Axia Limited. All rights reserved.
Sentinel
Totus 2 D-ERV
Installation, Operation & Maintenance
Stock Ref. N°
TOTUS2MINI
TOTUS2MINI/CP
TOTUS2MIDI
TOTUS2MIDI/CP
TOTUS2MAXI
TOTUS2MAXI/CP
PLEASE RETAIN THESE INSTRUCTIONS WITH THE PRODUCT.

Safety Information
2 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
IMPORTANT
PLEASE READ THESE INSTRUCTIONS
CAREFULLY BEFORE COMMENCING
INSTALLATION AND LEAVE THEM WITH
THE END USER.
1. THESE UNITS MUST BE SITED AND CONNECTED IN
ACCORDANCE WITH CURRENT IEE REGULATIONS, BS7671
(UK) OR THE APPROPRIATE STANDARDS IN YOUR
COUNTRY.
2. INSTALLATION SHOULD BE BY A QUALIFIED ELECTRICIAN
AND INSTALLER.
3. ALL REGULATIONS AND REQUIREMENTS MUST BE
STRICTLY FOLLOWED TO PREVENT HAZARDS TO LIFE AND
PROPERTY, BOTH DURING AND AFTER INSTALLATION, AND
DURING ANY SUBSEQUENT SERVICING AND MAINTENANCE.
4. THESE UNITS MUST BE EARTHED.
5. SITE THE UNIT AWAY FROM DIRECT SOURCES OF HEAT.
AMBIENT TEMPERATURE RANGE 10 TO 40ºC.
6. WHEN INSTALLING UNIT, TAKE CARE NOT TO DAMAGE
ELECTRICAL OR OTHER HIDDEN UTILITIES.
7. CHECK THE DETAILS ON THE RATING LABEL FOR
CORRECT VOLTAGE AND ELECTRICAL RATING.
8. THE INSTALLER IS RESPONSIBLE FOR THE INSTALLATION
AND ELECTRICAL CONNECTION OF THE SENTINEL SYSTEM
ON SITE. IT IS THE RESPONSIBILITY OF THE INSTALLER TO
ENSURE THAT THE EQUIPMENT IS SAFELY AND SECURELY
INSTALLED AND LEFT ONLY WHEN MECHANICALLY AND
ELECTRICALLY SAFE.
9. DUE TO THE WEIGHT OF THE UNITS, IT IS
RECOMMENDED THAT MULTIPLE PERSONS ARE INVOLVED
IN THE INSTALLATION. AT ALL TIMES, INSTALLATION
PRACTICES MUST COMPLY WITH RELEVANT HEALTH AND
SAFETY LEGISLATION.
10. SENTINEL AIR HANDLING UNITS ARE DESIGNED AND
SPECIFIED FOR USE WITH VENT-AXIA CONTROLS,
DAMPERS, GRILLES AND ACCESSORIES.
11. THIS APPLIANCE IS NOT INTENDED FOR USE BY YOUNG
CHILDREN OR INFIRM PERSONS WITHOUT SUPERVISION.
12. YOUNG CHILDREN SHOULD BE SUPERVISED TO ENSURE
THAT THEY DO NOT PLAY WITH THE APPLIANCE.
13. PRECAUTIONS MUST BE TAKEN TO AVOID THE
BACKFLOW OF GASES INTO THE ROOM, FROM THE OPEN
FLUE OF GAS OR OTHER FUEL BURNING APPLIANCES.
14. THIS UNIT SHOULD NOT BE USED IN A GREASE-LADEN
ATMOSPHERE. IF THE UNIT IS TO BE USED IN A GREASE-
LADEN ATMOSPHERE SUITABLE DUCT FILTRATION SHOULD
BE USED.
PRODUCTS COVERED
Thank you for purchasing Sentinel Totus 2 D-ERV.
This document describes the installation and
commissioning of your equipment to help get your
equipment up and running. It also provides essential
maintenance and troubleshooting information to assist the
operation and prolong the lifetime of your equipment.
This document covers the Sentinel Totus 2 D-ERV series
detailed in the following table.
Table 1: Products Covered by this Document
Model Number Description
TOTUS2MINI Totus 2 Mini
TOTUS2MINI/CP Totus 2 Mini/ Constant Pressure
TOTUS2MIDI Totus 2 Midi
TOTUS2MIDI/CP Totus 2 Midi/Constant Pressure
TOTUS2MAXI Totus 2 Maxi
TOTUS2MAXI/CP Totus 2 Maxi/Constant Pressure
See Technical Specification for details of these models.

About this Document
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 3
CONTENTS
Product Description 4
Sentinel Totus 2 D-ERV............................................................... 4
Technical Specification 6
Sentinel Totus 2 D-ERV Technical Specification.......................... 6
Commissioning Record................................................................ 6
Dimensions.................................................................................. 7
Installation 11
Installing Your Energy Recovery Ventilation System...................11
Before Installing Your Equipment................................................12
Physical Installation ....................................................................13
Electrical Installation...................................................................17
Switching On/Off.........................................................................23
Commissioning 24
Commissioning Your Energy Recovery Ventilation System.........24
Commissioning Screens .............................................................26
The Settings Code......................................................................37
Writing Down the Settings Code .................................................38
Default Settings ..........................................................................39
Restoring Settings 40
Restore Settings Screens ...........................................................40
Operation and Monitoring 42
About Operation and Monitoring .................................................42
Status Monitoring Screens..........................................................42
Maintenance 46
Caring for Your Unit....................................................................46
3-Monthly Maintenance ..............................................................46
12-Monthly Maintenance ............................................................46
5-Yearly Maintenance.................................................................46
Removal/Replacement of Parts 47
Cover Removal/Replacement .....................................................47
Filter Removal/Replacement (Roof-Mounted) .............................49
Filter Removal/Replacement (Ceiling-Mounted)..........................49
Motor Removal/Replacement (Roof-Mounted)............................50
Motor Removal/Replacement (Ceiling-Mounted).........................51
Float Switch Removal/Replacement (Roof-Mounted)..................52
Float Switch Removal/Replacement (Ceiling-Mounted) ..............53
Condensate Pump Removal/Replacement (Roof-Mounted)........54
Condensate Pump Removal/Replacement (Ceiling-Mounted) ....55
Filter Removal/Replacement (Maxi)……………..………………....56
List of Spares .............................................................................57
Troubleshooting 58
Diagnosing a Problem ................................................................58
Diagnostic Codes .......................................................................58
Fault LED/Status Relay ..............................................................59
Power Supply Troubleshooting ...................................................59
Airflow/Temperature Troubleshooting .........................................60
Condensate Troubleshooting......................................................61
Appendix A: Glossary 62
Terms and Abbreviations ........................................................... 62
Appendix B: Options and Accessories 63
Sentinel Totus............................................................................ 63
Appendix C: Main Controller PCB Terminals 64
Terminals................................................................................... 64

Product Description
4 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Product Description
Sentinel Totus 2 D-ERV
Sentinel Totus 2 Demand Energy Recovery Ventilation (D-ERV) is a heat recovery demand ventilation
system designed to meet modern building management and control principles.
Employing a range of sensors to manage the system, demand is typically sensed by PIR, temperature,
humidity, air quality, carbon dioxide sensors or other types of Vent-Axia proprietary sensors (see Appendix B:
Options and Accessories on page 63 for details).
It can respond to the ventilation requirements of a room by providing airflow only when it is required and at the
level that is required, using only the energy that is needed, while recovering maximum energy from the
extracted air and transferring it to the fresh supply air. This overcomes many of the drawbacks encountered with
traditional fixed volume ventilation systems, which operate irrespective of the occupancy of the room, leading to
over ventilation and a wasteful use of energy.
Note that the unit contains heaters, which automatically prevent the heat recovery cell from freezing and can
also be used to “Top Up” the air temperature to the room.
Models
 Mini designed to operate at airflows of up to 650 m
3
/hr at 150 Pa.
 Midi designed to operate at airflows of up to 1000 m
3
/hr at 150 Pa.
 Maxi designed to operate at airflows of up to 2000 m
3
/hr at 150 Pa
Figure 1: Sentinel Totus Mini & Midi 2 D-ERV
External
Ambient Air
I
nternal
Room Air
Commissioning
Interface
Main Controller
PCB Access Panel Condensate
Drain
Heaters
Counter-flow Cell Summer Bypass
DC Motors
T4
T1
T1-T4 = internal
temperature
sensors
Filter Water Pump
CP Switch
(Optional)
Filter
T
3
T
2

Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 5
Figure 2: Sentinel Totus 2 Maxi D-ERV
T
3
T
2
T1
T4
Counter-flow Cell
Heaters
DC Motor
Filter
Summer Bypass
Entry Panel
Main
Controller
PCB Access
Panel
Access
Panel
I
nternal
Room Air
External
Ambient Air
T1-T4 = internal
temperature
sensors

Technical Specification
6 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Technical Specification
Sentinel Totus 2 D-ERV Technical Specification
Performance Mini Midi Maxi
Airflow (nominal) 650 m
3
/hr at 150 Pa 1000 m
3
/hr at 150 Pa 2000 m
3
/hr at 150 Pa
Power
AC Voltage Input 220-240 V ac (single phase)
AC Frequency Input 50/60 Hz nominal
Supply Fuse or Cct Breaker 16 A 16 A 32A
Rated Current 12 A 12 A 20A
Rated Power 1825 W 2500 W 5000W
Total Fan Power (max.) 325 W 500 W 1000W
Total Frost Heater (max.) 1.5 kW 2 kW 4kW
Power (standby) 0.6 W 0.6 W 0.6 W
DC Voltage Output 24 V dc (18-30 V dc) at 350 mA (max.) for switches and sensors
Battery See Table 6: 5 12-Monthly Maintenance on page 46
Product Fuses
Power PCB See Table 11: Internal Fuse Values and Types on page 60
Main Controller PCB See Table 11: Internal Fuse Values and Types on page 60
Physical
Height/Width/Depth Mini, Midi & Maxi see page 7 and 8
Weight 145 kg 167 kg 250 kg
Environmental
IP Rating - Unit IPX4
IP Rating - Commissioning
Interface
IP42
Operating Temperature -10°C to +40°C
Operating Humidity 0% to 95% (non-condensing) – weatherproof unit option
Storage Temperature -10°C to +40°C
Storage Humidity 0% to 95% (non-condensing)
Condensate Pump 12 m max head, 25 m max horizontal distance, but 150 max head X distance
Software Version V25
For all other technical details, please see the Product Catalogue or our website at www.vent-axia.com.
Commissioning Record
Record the unit commissioning settings here.
Date Settings Code Who
For details of the settings code, see
The Settings Code on page 37.

Technical Specification
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 7
Dimensions
Model
Dimensions (mm)
a b c d e f g h i j k l m n o p q r
Mini 1800 1920 352 940 900 450 250 - 60 142 174 962 153 42 188 375 72 1656
Midi 1900 2020 350 1290 1250 538 400 250 60 220 175 1315 147 47 332 526 72 1758
Maxi 1800 1925 660 1212 1130 530 400 - 60 710 578 - - - - 635 - -
Mini
Midi

Technical Specification
8 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Maxi
Figure 3: Unit Dimensions for Mini, Midi & Maxi

Technical Specification
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 9
Filter and Control Box Access

Technical Specification
10 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
MAXI

Installation
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 11
Installation
Installing Your Energy Recovery Ventilation System
WARNING
THIS EQUIPMENT PRESENTS ELECTRICAL, MECHANICAL AND NOISE HAZARDS. FAILURE TO USE SAFE
WORKING PRACTICES AND OBSERVE THE RELEVANT REGULATIONS MAY RESULT IN DEATH OR
SERIOUS INJURY.
The following instructions are intended to help prevent and/or minimize potential hazards and should be carried
out only by a qualified electrician and installer.
How to Install Your Energy Recovery Ventilation System
The figure below summarises the instructions given in the following paragraphs.
Figure 4: Installation Overview
Before Installing Your Equipment
1. Read Safety Notices
2. Inspect the Unit
3. Lift and Move the Unit Safely
4. Store the Unit (if Required)
Physical Installation
1. Check Site Requirements
2. Fit the Unit (Roof or Ceiling)
3. Ensure Unit Access
4. Attach Ducting
5. Connect the Condensate Drain
Electrical Installation
1. Connect Switches and Sensors
2. Connect the Power Supply
3. Connect the Commissioning Interface
Switching On/Off
1. Switch On
PLEASE READ IMPORTANT
SAFETY INFORMATION PROVIDED
ON THE INSIDE COVER OF THIS
MANUAL AND OBSERVE ALL
WARNING AND SAFETY LABELS
PROVIDED ON THE EQUIPMENT
FOR DETAILS OF EACH STEP,
SEE THE FOLLOWING HEADINGS

Installation
12 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Before Installing Your Equipment
Read Safety Notices
The equipment must be handled carefully and thoughtfully to prevent safety hazards and damage.
Ensure the personnel designated to install the unit have the appropriate skills and knowledge.
Before commencing installation, please read and observe the safety notices given in the inside front cover of
this manual.
Inspect the Unit
The unit is supplied on a pallet, shrink-wrapped in polythene. When taking delivery of the unit, check the items
delivered against the enclosed delivery note. Inspect the unit for damage in transit. If in doubt, contact Customer
Services.
Lift and Move the Unit Safely
This weight of this unit is detailed in the Technical Specification on page 6. Always use appropriate lifting
techniques and appliances when moving heavy equipment. A forklift truck, crane or similar lifting gear is
required to lift and move the unit. Support the unit under the 3 support points, as shown in figures 5, 6.
Store the Unit (if Required)
If the unit is to be stored for a long period of time the fan impellers must be rotated by hand at monthly intervals
to prevent hardening of the lubricant and corrosion or static indentation of the bearings.
If the unit has been stored, it is recommended that before installation, the resistance to earth should be
measured. If found to be less than 2 MΩ, the unit should be left in a warn dry room for 24 hours and re-
measured before applying mains voltage. If the resistance is still less than 2 MΩ, there is likely to be a fault.
The unit must be stored in clean, dry conditions.

Installation
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 13
Physical Installation
Check Site Requirements
Before installing the unit, check that the physical and environmental conditions for the site meet, or exceed, the
requirements detailed in the Technical specification on page 6.
DO NOT install these fans in areas where the following may be present:
 Excessive oil or grease laden atmosphere.
 Corrosive or flammable gases, fluids or vapours.
 Possible obstructions that will hinder removal.
Fit the Unit (Roof or Ceiling)
The Mini or Midi units MUST be mounted horizontally to ensure drainage of the condensate tray. DO
NOT mount this unit vertically. The Maxi unit must be installed on a 2°slope. See diagrams below.
Do not use this unit as a support for any other equipment.
Always use the appropriate fixings, supports, studs and hangers; and ensure that the unit is firmly and
safely located.
Roof Mounting the Unit
The suggested method for roof mounting is to support the unit on six blocks. The support blocks should provide
150 mm clearance between the unit and the roof, thereby allowing sufficient room for the fitting of the
weatherproof cowls, as shown in the figure below. The blocks should be positioned directly below the support
brackets provided for ceiling mounting.
Unit to be Level in All Directions
Floor Level
Figure 5: Unit Roof Mounted for Mini & Midi (Recommended)
Mount on 4 blocks placed under mounting brackets on
unit. Minimum of 150mm from Floor level

Installation
14 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Figure 6: Unit floor or Roof Mounted for Maxi (Recommended)
If required, weatherproof cowls (see Appendix B: Options and Accessories on page 63) can be fitted at the
ambient end (external intake and exhaust).
Note
Any exposed ductwork must be insulated if the Totus 2 is mounted on a roof or other external position.
Fitting the Weatherproof Cowl (If Required)
1. Ensure that the Totus 2 has been mounted with sufficient clearance available (150 mm) to fit the
weatherproof cowls at the external ambient air end of the unit.
Note
The weatherproof cowls are fitted at the same end as the motors.
2. Position each cowl over the flange around each opening, as shown in the figure below. Use sealant to seal
the flange to the cowl to maintain the internal pressure and prevent water ingress.
3. Secure each cowl to the chassis using 6 x no. 10 self-tapping screws.
Drill holes (
ᶲ 4)

Installation
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 15
Suspending the Unit from a Ceiling – Mini & Midi
The unit is designed for stationary use and MUST always be mounted horizontally to ensure drainage of the
condensate tray. DO NOT mount this unit vertically.
The unit provides six brackets, one at each corner and two half-way along the length of the unit, from which
to suspended it. Ensure the drop rods & their attachment to the ceiling are of sufficient strength.
Figure7: Unit Suspended from Ceiling for Mini & Midi
Ensure Unit Access
Ensure the unit is installed in such a way as to allow access to the control unit, connectors and filters (see Filter
Removal/Replacement (Ceiling-Mounted) on page 49). Check the dimensions of the unit detailed in the
Technical Specification.
Leave a gap of 500 mm to enable the Control Panel to be removed and to gain access to the Commissioning
Interface and the Main Controller PCB.
Figure 8: Control Panel Access
On the opposite side of the unit a gap of 75 mm should be left to enable someone to be able to release the
thumb catches when removing the top or bottom covers (see Cover Removal/Replacement on page 47).
4 support brackets and rods
suspend the unit from the ceiling

Installation
16 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Suspending the Unit from a Ceiling – Maxi
The unit is designed for stationary use and MUST always be mounted horizontally with a 2°tilt on the long side
the motor end should be lower ) and horizontally with no tilt on the short side, to ensure drainage of the
condensate tray. DO NOT mount this unit vertically.
The unit must be suspended on six drop-rods and cradle are of sufficient strength to support the weight of the
unit. Align that the drop-rods with the arrows with the sides of the units and ensure they are mounted 350 mm
away from both the sides of the unit to allow opening of access panels.
Figure 9: Unit suspended from ceiling for Maxi (Recommended)
Ensure Unit Access
Ensure the unit is installed in such a way to allow access to the control unit and connectors check the
dimensions of the unit detailed in the technical specification. Note that the control door requires a 350 mm
space in order to open fully.

Installation
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 17
Attach Ducting
WARNING
IF THIS EQUIPMENT IS RUN WITHOUT DUCTING FITTED, THERE IS A POTENTIAL HAZARD FROM
ROTATING PARTS THAT CAN BE REACHED DURING OPERATION.
Fit appropriate ducting to the unit in accordance with the supplied drawings for the building.
Fit flexible connectors adjacent to the unit. Ensure they are taut.
When fitting clamping bands to flexible connectors, ensure that the flexible connectors are pulled tight and the
ducts are not misaligned.
The unit provide rectangular ducting interfaces. Fit adapters as necessary to connect to ducting with a circular
cross-section.
In order to facilitate access to, and replacement of, the extract motor on the external/ambient side, a suitable,
easily disconnected section of ducting should be fitted, if ducting is required, in installations where the unit is
mounted internally.
Connect the Condensate Drain
The unit should be mounted horizontally to ensure drainage of the condensate drain.
Use 10 mm pipe or flexible hose to connect to the condensate drain in order to carry away any water produced
because of internal condensation. Ensure that the water is routed to a suitable outlet, which can be up to 12 m
above the unit as there is an internal pump. This pipe should be insulated if installed in an area that could
freeze, or fit a proprietary frost pipe heater.
Electrical Installation
Connect Switches and Sensors
Connect any required switches and/or sensors as recommended by the system designer in the drawings
supplied by him.
A 24 V dc nominal (18-30 V dc) supply at 350 mA max is provided for powering switches and sensors, etc.
Analogue signal returns must be 0-10 V dc with common ground for the instrument and cable screen at the
control board.
The terminal connections provided by the Main Controller PCB for connecting to switches, sensors, etc., are
shown below. Other terminals are connected as required at the factory. DO NOT disconnect any factory fitted
connections.

Installation
18 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Figure 10: Main Controller PCB Terminal Connections
0-10V Inputs
Outputs
Factory Fitted
Factory Fitted
Factory Fitted
Switched Inputs
Factory Fitted
Note:
Both N/C and N/O
states are with the power off.
24V
I/P
0V
24V dc: Output to drive sensor, etc.
I/P: 0 – 10V dc input from sensor, etc.
0V dc: Zero volt or common line
0V dc: Zero volt or common line
I/P: 24V dc input from switch, etc.
(10V dc minimum required)
24V dc: Output to switch, etc.
0V
I/P
24V

Installation
Sentinel Totus 2 D-ERV Installation, Operation and Maintenance 19
Connect the Power Supply
WARNINGS
1. MAINS SUPPLY VOLTAGES (220-240 V AC) ARE PRESENT IN THIS EQUIPMENT WHICH MAY CAUSE
DEATH OR SERIOUS INJURY BY ELECTRIC SHOCK. ONLY A QUALIFIED ELECTRICIAN OR INSTALLER
SHOULD CONNECT THE POWER SUPPLY TO THIS UNIT.
2. THIS UNIT MUST BE CORRECTLY EARTHED IN ORDER TO PROVIDE OVERCURRENT AND EARTH
FAULT PROTECTION.
3. DO NOT OVERLOAD WALL OUTLETS AND EXTENSION CABLES AS THIS MAY RESULT IN A RISK OF
FIRE OR ELECTRIC SHOCK.
4. ENSURE THE UNIT ISOLATOR IS SET TO OFF AND LOCKED IN POSITION BEFORE REMOVING THE
UNIT COVERS.
Check the Technical Specification for the voltage, current and fusing information relevant to this product.
This unit is designed for operation either from a single-phase alternating current source (220-240 V ac) or from
three single-phase alternating current sources (220-240 V ac) that will allow you to distribute the current for the
heaters, fans and unit through three separate outlets and cables, if required.
Wiring to the unit should be routed via a double-pole isolating switch (in accordance with local electrical wiring
regulations) adjacent to the unit, or taken from the distribution board.
Ensure suspension between power and control cable.
•Mini & Midi
To connect the power supply:
1. Ensure the local ac power supply is isolated at the distribution board before connecting the supply cable.
2. Ensure the correct fuse type, or circuit breaker has been fitted to the ac power input supply. A means of
disconnection should also be provided in the fixed wiring.
3. To prevent the equipment being accidentally switched on while you are away from it the unit isolator may
be locked in position. Pull out the yellow inner section of the isolator switch to lock the isolator in position,
revealing a hole through which a padlock, or other lockable device, may be inserted.
4. Remove the unit Control Panel cover by unscrewing the six securing screws.
Figure 11: Control Panel Cover Removal
5. Remove the High Voltage Cover by unscrewing the two securing screws.

Installation
20 Sentinel Totus 2 D-ERV Installation, Operation and Maintenance
Figure 12: High Voltage Cover Removal
6. This high voltage screw terminal block is now uncovered to enable you to connect the ac power cable(s).
Figure 13: High Voltage Terminal Block
In countries where the required supply current is not available from a single phase supply, the heaters can be
wired up to separate single phase supplies which are to be connected according to local regulations.
Using One Single-Phase Power Supply
7. Route a suitably rated round power cable through the cable gland provided on the bottom of the Control
Panel directly below the High Voltage Terminal Block. A 7-10 mm diameter cable should be used to
ensure sufficient grip by the cable gland. The gland MUST be sealed properly to maintain the IP rating of
the unit.
8. Connect the Earth (green and yellow) wire to the Earth terminal , make sure the Earth wire is at least
50mm longer the others. Connect the Live (brown) wire to all three terminals L1, L2 and L3. Connect the
Neutral (blue) wire to terminals N1, N2 and N3, as shown in the figure below (wire colours apply to UK
cables). If the heaters are not required then omit the links to L2, L3, and N2, N3.
Figure 14: Single-phase Terminal Connections
9. Connect the other end of the power cable to a power supply outlet or distribution board.
When replacing the cover ensure the earth bonding lead is attached to the cover.
Unit Isolator
High Voltage Cover