PAC PAC-350WM Guide

HIGH-EFFICIENCY, HEAT-RECOVERY VENTILATION UNITS
TEL：[phone]
WEB：www.pacventilation.com
COMPANY：PAC Ventilation Ltd
ADDRESS：Market Court, 20-24 Church Street, Altrincham, WA14 4DW
ventilation

PAC-350WM
Installation, operation & maintenance instructions
DO NOT THROW AWAY

IMPORTANT SAFETY INFORMATION –PLEASE READ THESE INSTRUCTIONS
CAREFULLY PRIOR TO COMMENCING INSTALLATION
Responsibility for the correct and safe installation rests with the installer.
Read through the full manual prior to installation.
Make sure there is sufficient space to install the unit for effective operation and to
ensure access for maintenance and servicing.
Take care to ensure the external air intake is positioned so that it is not near
combustion gases, boiler vents or other open flues.
Any electrical work must be done by a qualified and licensed electrician.
If the power cable is damaged, do not use the unit and contact the supplier.
Use at the rated voltage.
Install the unit to a sufficiently strong wall surface with appropriate anchors for the
weight.
Do not use is excessively hot temperatures (above 40C) or excessively cold
environments (less than -20C).
In areas prone to strong winds, install a 90-degree bend on the wall termination kit if
the prevailing winds are liable to blow directly at the external intake or extract louvre.
This appliance 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 use of the appliance by a
person responsible for their safety.
Young children should be supervised to ensure they do not play with the appliance.
Turn the unit off whilst undertaking any building renovations.
Before doing any maintenance work, including changing or cleaning filters, the unit
must be isolated from the electrical supply.

Introduction
The PAC-350WM is a wall mounted heat recovery ventilation unit designed for use
within small commercial environments. It provides fresh air for building occupants (as
determined by building regulations) in addition to having the boost functionality to
provide a purge ventilation cycle when required.
The supply and extract fans within the unit simultaneously supply fresh air and extract
stale air whilst transferring the heat from the dirty air to the fresh air intake airflow.
To minimise fallow time, the unit will provide 10 air changes for a room with a volume
of 35m3 or less. The room volume is simply calculated by multiplying the width of the
room by the length of the room by the height of the room (in metres).
The unit is to be installed directly on an external wall. 2 holes will need to be drilled
through the wall with ducting pushed through the holes from outside and an air
termination device installed externally to both the supply and extract duct.
The unit has an integral LCD touch screen controller which provides all functionality
and shows the internal air conditions as the unit has inbuilt particle, CO2 and humidity
sensors.

Control panel layout

Unit diagram
Key
1 Supply air discharge
2 LCD touch screen control panel
3 Supply air filter housing (primary and secondary air filters)
4 CO2, humidity, PM2.5 & temperature sensors
5 Extract air intake
6 Supply air blank panel for changing the filter handing
7 Supply air discharge filter
8 Extract air filter
9 Heat exchange unit
Unit dimensions

Dimensions
Duct sizes
Height –mm
820
Supply air –mm
160
Depth –mm
230
Exhaust air –mm
120
Width –mm
430
Weight –kg
21

Installation
Use the supplied template to mark and make the holes in the external wall for the
ducts from the rear of the unit.
Use the template to make the 4 no holes for the fixing screws for the unit.
Ensure the screws and fixings have the strength to support the weightof the unit and
check that the wall is strong enough to hang the unit.

Unit setting out
Minimum clearance for installing the unit are to be as per the diagram above
Changing the filter access
The filter access can swap sides if maintenance access is a problem with the filter
housing in its default factory location.
Remove the supply air filter by sliding out the filter housing on the side of the unit.
Remove the blanking panel on the LHS of the unit and slide in the filter housing
ensuring the same orientation of the filter box (ie the airside filter on the external
facade side of the unit). Put the blanking plate on the RHS.

Installation of duct wall termination kit:
Supply air duct: 150 width with external louvre
Extract air duct: 125 width with external louvre
Measure the width of the wall through the hole formed for either duct:
Cut the plastic ducts (supply & extract) to size (length x) with a hacksaw.
Fix the external louvres to the plastic ducts with silicon.
Push each duct and louvre through the hole.
Secure the louvres with 4 no screws and appropriate anchors.
Seal around the louvres with an external sealant.

Control Instructions
1.ON and OFF switch
Press the on/off switch key to start or turn off the device.
Press the on/off button again to activate the touch screen LCD.
2.Mode Switch
The default mode when the unit is turned on is manual. In manual mode, the
supply air volume and return air volume can be set by the user.
Pressing the mode switch once, will put the unit in 'super mode'.
The unit will automatically operate to 350m3/hr supply air and 300m3/hr extract
air for 15 minutes (this can be adjusted as detailed in the advance function settings
below). Once the super mode is complete the unit will automatically switch to the
previous mode.
Pressing the mode switch again, will put the unit in 'auto mode'.
In 'auto mode' the device will adjust the supply and air volume based on the indoor
air quality. Supply air and extract air will default to the volumes as detailed in the
table below:
PM2.5
level
level
supply air m3/hr
extract air
m3/hr
PM2.5＜35
1
1
50
20
35≤PM2.5＜75
2
2
100
50
75≤PM2.5＜115
3
3
150
70
115≤PM2.5＜150
4
4
200
100
150≤PM2.5＜250
5
5
250
120
PM2.5≥250
6
6
300
150

3 Air volume adjustment
The air volume can only be operator adjusted in manual mode.
In manual mode, a short press on the 'up' button and the supply air volume will flash.
Press the up or down key to increase the air volume (up to 300m3/hr) in increments
of 10m3/hr to the required level.
Whilst the supply air volume is flashing, press the 'air flow' switch and the extract air
volume will flash. Press the up or down key to increase the air volume (up to
300m3/hr) in increments of 10m3/hr to the required level.
4.Advanced function setting
When the unit is on, long press the 'air speed key' for 3 seconds to enter advanced
function settings.
Press the up / down key to scroll between 01 and 12 as per the option settings in the
table below. Press the 'mode key' to select the option required.
To exit the advanced function setting at any stage, press the on/off switch.
01 Press the up / down switch to set the number of hours of operation (up to 8).
Press the 'mode switch' when the hours have been selected.
02 Press the up / down switch to turn the work days programme on or off.
If on is selected scroll through the six programme times to turn the unit on or off and
set the time for each mode accordingly.
Option
Function
Description
1
Timed shutdown
0-8 hrs
2
Workday programme setting
Set operating hours
3
Weekend programme setting
Set operating hours
4
Day of week / time setting
Day / time
5
Screen brightness setting
0-7 –default 3
6
Screen save time
0-5 –default 1
7
Super mode time setting
1/2/3 –default 1
8
Electric heater temperature difference
0-25C –default 10C
9
Filter 1 –primary supply air filter
1-20 months –default 3
10
Filter 2 –secondary supply air filter
1-20 months –default 3
11
Filter 3 –extract air filter
1-20 months –default 12
12
Filter 4 –heat recovery exchanger
1-20 months –default 6

03 Press the up / down switch to turn the weekend programme on or off.
If on is selected scroll through the six programme times to turn the unit on or off and
set the time for each mode accordingly.
04 Press up and down between 1 to 7 to set the work day (Monday being 1); press
'mode button' when the weekday has been set to then change the time / set hours
with up and down / press M / press up and down to set minutes / press M to get
back to main function menu
05 Press up / down to set the screen brightness. Press 'mode button' when
complete.
06 Press up / down to set the screen saver time for the LCD display on the main
panel. Press 'mode button' when complete.
07 Press up / down to increase / decrease the duration of the super mode. Press
'mode button' when complete.
08 Press up / down to set the temperature difference between the outdoor
temperature and indoor temperature before the electric heater is activated. Press
'mode button' when complete.
09 Press up / down to increase or decrease the time period between filter cleans on
the primary supply air filter. Press 'mode button' when complete.
10 Press up / down to increase or decrease the time period between filter cleans on
secondary supply air filter. Press 'mode button' when complete.
11 Press up / down to increase or decrease the time period between filter cleans on
the extract air filter. Press 'mode button' when complete.
12 Press up / down to increase or decrease the time period between the cleaning of
the heat exchanger . Press 'mode button' when complete.

Maintenance
PRIOR TO ANY MAINTENANCE WORK, THE UNIT MUST BE ISOLATED AT SOURCE
The filters will need cleaning on a regular basis.
It is recommended (dependent on usage and the environment) to clean the supply
air filters every 3 months.
Slide out the supply air filter housing and remove both filters.
The primary supply filter (the thinner of the 2 filters located nearest the external
wall) can be brushed clean or washed with water if required.
The secondary supply filter (thicker of the two filters) cannot be washed but can be
brushed clear of any debris.
SECONDARY SUPPLY AIR
FILTER
PRIMARY SUPPLY AIR
FILTER
It is recommended (dependent on usage and the environment) to clean the extract
air filter and supply discharge filter every 3 months.
Remove the magnetic top front panel and slide out the extract & supply discharge
filters. The extract and supply discharge filters cannot be washed but should be
brushed clean of any debris.
SUPPLY DISCHARGE FILTER
EXTRACT AIR FILTER

It is recommended (dependent on usage and the environment) to clean the
heat exchange unit every 6months.
Remove the magnetic top front panel and remove the 6 no screws as below to access
the heat exchanger –remove the screws holding the heat exchanger in place. Picture
of removing magnetic top panel
Pull the heat exchanger out of the housing - clean the exchanger by brushing or
blowing off any debris.
Filter re-set
The filter alarm light will come on as a reminder to clean the filters.
Filter 1 –primary supply filter
Filter 2 –secondary supply filter
Filter 3 –supply discharge / extract air filters
Filter 4 –heat exchanger
Once the filter has been cleaned, press and hold the mode button for 3 seconds to
reset the filter settings.
HEAT EXCHANGER
6 NO. SCREWS

Wiring diagrams

Troubleshooting
Issue
Resolution
1
No display when
power is on
Check the wiring between the control board and the
unit
Check the power supply into the unit
2
Display normal
but no output
Check the wiring between the control board and the
unit
Alarm prompts:
E1 –communication between the display and power board is abnormal –ring PAC
for a service engineer or replacement if the unit is within warranty
E4 –the sensor board is faulty –ring PAC for a service engineer or replacement if the
unit is within warranty

TECHNICAL SPECIFICATIONS
AIRFLOW
ELECTRICAL
Supply air volume –m3/hr
350
Supply fan –A
0.5
Extract air volume –m3/hr
300
Extract fan –A
0.3
Total run current –A
0.8
SUPPLY FAN
Voltage
220V / 50Hz
Connection
3 pin plug
Fan type
DC Plug
Fan motor
DC Internal
HEAT EXCHANGER
Power –Watts
45
Fan diameter –mm
140
Medium
Paper
Motor start
Soft start
Size –w*d*h –mm
250*250*207
Control
Inverter 0-10V
Heat exchange rate
60%
Protection
Thermal / current
overload
FILTRATION
EXTRACT FAN
Type
H13
Primary supply filter
394*363*10
Fan type
DC Plug
Secondary supply
filter
394*363*58
Fan motor
DC Internal
Supply discharge filter
398*208*10
Power –Watts
45
Extract air filter
228*208*10
Fan diameter –mm
120
Motor start
Soft start
NOISE
Control
Inverter 0-10V
Protection
Thermal / current
overload
Noise
22-46dB(a)

[phone]
www.pacventilation.com
PAC Ventilation Ltd, Market Court, 20-24 Church Street, Altrincham, WA14 4DW
ventilation