A) Checks before lighting the Air
Heater
The following checks must be made before lighting the
heater(s)
a) Ensure 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 and,
if there is a Summer/Winter mode, it is set to Winter.
f) Check that the overheat reset button has not operated.
B) Lighting the Air Heater
1) Gas-fired Heaters
1. Switch on the electrical supply at the isolator.
2. The burner air fan will run and after a pre purge period
of approximately 30 seconds the ignition spark will be
generated.
CPx 30 - 90
The main gas valves will open and the main burner will be
established
CPx 120 - 300
The start gas valves will be opened and a start gas flame
established. When a start gas flame is established the
main gas valves will be energized and the start gas flame
will expand to main flame.
NOTE: If the main burner or a start gas flame fails
to establish 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.
2) Oil-fired Heaters
NOTE: If it is not possible to light the heater after
2/3 attempts contact the local service company.
1. Switch on the electrical supply at the isolator.
2. 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 fire.
NOTE: If the burner fails to light it 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.
If the unit will not light after four or five attempts
then shutdown the unit and call in a service engi-
neer.
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 gas or 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 auto-
matically stop.
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 towards the top of
the air heater upper front panel.
i) Main Air Fan MAN / Auto
When the white button (Refer to Figure 1 below) 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 automatical-
ly in conjunction with the burner. See Section 4.
ii) 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 thermo-
stat 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 oper-
ational 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 exam-
ple a power cut whilst the
heater
was
operating, a service engineer should be contact-
ed.
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.
F) Maintenance
Regular servicing is essential to maintain efficient, reliable
and safe operation of the heater. Users are strongly
recommended to have the heater serviced at least annu-
ally 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 adja-
cent to the heater.
All Powrmatic heaters use gas, or 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
Gas 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.
For gas fired heaters only:
If at any time a gas leak is suspected turn OFF
the gas supply - DO NOT USE A NAKED FLAME
- and contact the local gas undertaking immedi-
ately.
Gas Safety (Installation & Use) Regulations
It is law that all gas appliances are installed,
adjusted and, if necessary, converted by qualified
persons* in accordance with the latest edition of
the above regulations. Failure to install applianc-
es correctly can lead to prosecution. It is in your
own interests and that of safety to ensure
that the law is complied with.
* An approved class of person listed on the gas
register.
CPx Gas or Oil Cabinet Heater Range Issue 2.1 June 2014 Page 5
PUSH MAN
PULL AUTO
H o n e y w e l l
Fig 1. Limit Thermostat
White
Fan
button
