Powrmatic OUH 20, OUH 30, OUH 45, OUH 60 User, Installation And Servicing Instructions
OUH Suspended Oil Unit Heater
Industrial & Commercial Heating Systems.
Issue 5.1 September 2015
Users, Installaon and
Servicing Instrucons
WARNING: THIS APPLIANCE MUST BE EARTHED
H E A T I N G / / V E N T I L A T I O N / / A I R C O N D I T I O N I N G
powrmatic
Certificate of Guarantee
Dear Customer
This is to certify that this heater is guaranteed for two years parts and one year labour
from the date of original commissioning. The heater must be commissioned within 4
weeks of installation.
To make a claim
In the first instance you must contact your appliance supplier, or installer and provide:-
1. The appliance type and serial number.
2. The original commissioning documentat
ion.
3. As much detail as possible on the fault.
Your supplier, of installer, will then contact Powrmatic to make a guarantee claim on
your behalf.
Conditions of Guarantee
1. The heater must have been installed by a competent regognised instraller, and in
accordance with the manufactures instructions, building regulations and local
regulations.
2. The heater has been professionally commissioned
, within 4 weeks of installation,
and a copy of the Commissioning Sheet returned to Powrmatic.
3. The heater has been maintained on a yearly basis by a competent servicing
company.
4. The heater has been used in accordance with the manufactures instructions.
5. The correct specification fuel has been used.
6. No unauthorised repairs of modifications have been made.
7. Powrmatic ‘General Conditi
ons of Sales’ have been observed.
8. Except for the obligation of Powrmatic Ltd to perform warranty repairs during the
guarantee period Powrmatic will not be liable in repect of any claim for direct or
indirect consequential losses, including loss of profits or increased cost arising from
loss of use of the heater, or any event arising there from.
Exclusions
1. Gaskets and fan belts are not included in the guarantee.
----------------------------------------------------
Powrmatic Ltd, Hort Bridge, Ilminster, Somerset, TA19 9PS
Tel:01460 53535 Fax: 01460 52341
Web: www.powrmatic.co.uk e-mail service@powrmatic.co.uk
Important: This certificate must
be kept with the appliance
Failure to provide a copy of the commissioning sheet invalidates the heater waranty
Installer
Date :_____________ Signed ____________________________________________Installer
Commissioned
Date :_____________ Signed _______________________________Commissioning Engineer
Page 2 OUH Range Users, Instrucons & Service Instrucons Issue 5.1 September 2015
OUH Range Users, Instrucons & Service Instrucons Issue 5.1 September 2015 Page 3
Dear Customer - thank you for choosing Powrmac.
We appreciate you buying one of our high quality products and know that you have made the best
choice. By choosing Powrmac, you are invesng in UK manufacturing & its workforce. We pride
ourselves by manufacturing products that provide clean, comfortable and safe working environments worldwide together with the personal & professional service and back-up you deserve. If you
have any quesons or concerns regarding this product, please contact our Technical Support Team by
calling 01460 53535.
Users, Installaon and Servicing Instrucons
CONTENTS
Title Secon Contents Page
User Instrucons 4
Pre Installaon 1.1 Introducon 5
1.2 Technical Data - Size Data 6
1.3 General Requirements 8
Installaon 2.1 Fing the unit 11
2.2 Air Distribuon 12
2.3 Commissioning and Tesng 13
Servicing 3.1 Servicing 14
Data 4.1 Short List of Parts 15
Figure Title Page
1. Limit Thermostat 15
Table Title ` Page
1. Dimensions 7
2. Specications 7
3. Electrical Loadings 1ph 8
4. Burner Settings - 35sec Oil 8
Page 4 OUH Range Users, Instrucons & Service Instrucons Issue 5.1 September 2015
A) Checks before lighting the Air
Heater
The following preliminary checks should be made before
lighting the heater(s)
a) Ensure that the ELECTRICAL supply to the heater is
switched OFF.
b) Check that all warm air delivery outlets are open.
c) Check that the thermostat is set at MAX.
d) Check that the clock control is set to an ON period.
e) Check that any other controls are calling for heat.
f) Ensure that the Summer/Winter switch is in the Winter
position.
g) Check that the overheat reset button has not operated.
B) Lighting the Air Heater
NOTE: If it is not possible to light the heater after
2/3 attempts contact your installer.
1. Switch on the electrical supply at the isolator.
2. Press the limit interlock reset switch on the control box
of the heater. (Note: This step is not performed again
unless there is an interruption in the electrical supply to
the heater).
3. The burner air fan will run and after a pre purge period
of approximately 30 seconds the ignition spark will be
generated and the oil valve opened.
The main burner will then start.
NOTE: If the main burner fails to light the burner
will go to lockout and the lockout indicator / reset
button on the burner control box will be illuminated. To restart the burner push the lockout reset
button. Additional, more easily accessible,
controls may be fitted that mimic the lockout
indicator and reset button functions.
If the unit will not light after four or five attempts
then shut down the unit and call in a service engineer.
C) To Shut Down the Air Heater
1. For Short Periods:
Turn the room thermostat to the OFF or lowest setting.
2. For Long Periods:
Turn the room thermostat to the OFF or lowest setting.
Wait approximately 4-5 minutes for the main air fan of the
heater to stop running and the turn off the oil supplies and
electric supplies to the heater.
D) Description of Operation
Important: All heaters must be controlled by the
fitted external controls and not by use of the main
switch in the electrical supply to the heater.
The burner start up sequence will commence when the
controls
e.g. Timeclock, room thermostat etc. call for heat. The
burner air fan will run and after a pre purge period the
burner will light.
Approximately 2/3 minutes after the burner lights the
heater fan will automatically start. When the external
controls are satisfied the burner will be turned off and
approximately 4/5 minutes later the heater fan will automatically stop.
D.1) Summer / Winter Modes
Certain types of external controls will provide for two
modes of operation i.e.
Summer: The heater fan alone will run at the dictate of the
external controls to provide air movement.
Winter: The heater will operate normally.
E) Fan and Limit Control
The fan and limit controls are mounted on the top of the
air heater.
1. Main Air Fan MAN / Auto
When the white button (Refer to Figure following) is
pushed in the fan will run continuously i.e not controlled
by any external controls e.g. Timeclock. When the white
button is pulled out the fan will start and stop automatically in conjunction with the burner. See Section 2.
2. Limit Thermostat
This operates if high temperatures within the heater are
detected, the burners are turned off and a red indicator
light on the front of the heater is illuminated. The fault
condition must be identified and rectified and the thermostat manually reset.
When the unit has cooled push the reset switch on the
front of the heater to reset the limit thermostat interlock
relay, the red indicator light will go out and the unit is operational again.
Note: The limit thermostat(s) can only be reset
once the unit has cooled down.
Unless the cause of the fault condition is readily
obvious, for example a power cut whilst the
heater was operating, a service engineer should
be contacted.
Users Instructions
1.1 Introduction
The Powrmatic OUH Range is a range of oil fired forced
draught, closed flue, fanned circulation air heaters having
an output range of 20kW to 60kW .
The heaters are designed for suspension from suitable
roof points, or alternatively mounted on purpose designed
wall brackets, and are intended for heating commercial or
industrial premises.
The OUH-F has an axial type fan assembly fitted at the
rear of each heater to circulate the air being heated
across the combined combustion chamber/ heat
exchanger. A centrifugal fan variation is presented in the
OUH-C range for ducted applications. The OUH-D range,
in having no fan fitted, allows for ducted use where the air
moving unit is remote from the heater.
All units are fired with a forced draught packaged oil
burner complete with all necessary safety controls. Each
air heater must be connected to an individual closed flue
system only.
Fuel Types
All units are supplied as standard for use with 35sec fuel
and can be supplied for use with 28sec fuel as an option.
In accordance with guidelines from our burner supplier,
Riello, the burners fitted to Powrmatic oil-fired heaters are
suitable for fuels with a bio content of up to 10% only.
For fuels with a bio content of more than 10%, please
consult our Technical Department.
IMPORTANT
Service and Maintenance Engineers shall ensure
that replacement items are fitted, adjusted and
set in accordance with the data and detail set out
in these instructions. If in doubt consult P o w r matic Technical Department.
OUH Range Users, Instrucons & Service Instrucons Issue 5.1 September 2015 Page 5
Note: The limit thermostat interlock relay will
require resetting after loss of the electrical supply
to the heater regardless of whether the limit
thermostat has operated.
Limit Thermostat
F) Fan and Limit Control
Regular servicing is essential to maintain efficient, reliable
and safe operation of the heater. Users are strongly
recommended to have the heater serviced by a qualified
person at least annually and preferably at the end of the
heating season.
G) IMPORTANT
Free access must be maintained to and around
the heater for servicing purposes and the air
supply to the heater must not be restricted in any
way. Combustible materials must not be stored
adjacent to the heater.
All Powrmatic OUH heaters use oil and electricity
to power them, they may also contain moving
parts such as pulley belts.
It would be hazardous to tamper with or attempt
to service unless you are a competent person in
the field of Oil and Electrical work.
If you have any safety questions reference the
servicing and installation of any of our heaters
please do not hesitate to contact our head office
for expert advice.
Your safety is paramount to us.
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