Technical data

EM RANGE GAS FIRED
- 13 -
4,2 Commissioning - Ignition
Warning
Do not proceed with commissioning unless all
the criteria detailed within sections 4,0 and 4,1
have been satisfied.
(a) Ensure that the electrical supply is turned to
off
(b) Ensure that the gas supply is turned to off
(c) Select the following control settings
on/off - off
heat/ventilation - heat
manual/automatic - automatic
(d) Turn main electrical supply to on
(e) Select on position for on/off control
(f) Check for the following burner sequence
Note
It is strongly recommended that the separate
manual concerning the operational details of the
burner supplied with the EM unit as part of the
information package is studied prior to firing the
burner.
Time intervals within the ignition sequence will
vary slightly from one model to another.
Time interval Operation
1 - 5secs If applicable, combustion air
damper is actuated, fan motor starts purge
cycle...
2 - 40secs Pilot valve opens, ignition
transformer provides spark for pilot ignition...
either
3 - 40secs Ignition failure caused by gas
starvation resulting in burner lock-out/shut-
down...
(g) Clear burner lockout using burner reset
function
(h) Set EM unit control on/off switch to off
position
(i) Open gas cocks and repeat steps 4,1 q, and
4,2 c,e,f,
or
3 - 40secs Pilot ignition, Burner
ignition...
4 - 60secs Burner ignition cycle
complete.
Warning
If burner ignition is not satisfactorily
accomplished, commissioning must not proceed
until the reason or fault has been identified and
rectified, if necessary by reference to the
separate burner information or to section 6,0 of
this manual.
(j) Repeat steps 4,2 c,a,
(k) Re-check all connections and joints for gas
soundness using an approved leak detection
fluid
(l) Attach manometers to check pressure
settings
(m) Repeat steps 4,2 d,e,f, allowing the EM unit
to reach thermal equilibrium
(n) Check pressure settings are in line with the
technical data (if adjustment is necessary refer
to separate burner information)
Note
The figures quoted in section 8 are independent
test figures based upon zero flue resistance.
(o) Adjust room thermostat to its highest
setting, and allow the EM unit to continue to fire
(p) Gradually reduce the temperature setting on
the room thermostat until the burner shuts down,
and then gradually increase the temperature
setting on the thermostat until heat is called for,
and the burner automatically re-fires
(q) Re-set time clock to a minimum off period,
checking that the burner shuts down, and then
automatically re-lights once the minimum off
period has elapsed
Note
If specific temperature rise characteristics are a
requirement then these should be noted, and the
burner rated accordingly prior to flue gas
analysis.
(r) Undertake flue gas analysis and efficiency
checks across the operational range using
approved and calibrated apparatus.
Note
All EM units are test fired and pre-
commissioned as part of the manufacturing
process, if however, during on site
commissioning the data are found not to be in
accordance with the manufacturers data, then
the following course of action is recommended;
• Re-check all readings and calculations