BENSON OUH 2 100, Installation And Operating Manual

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3. Commissioning.
Warning
It is a requirement that only suitably qualifi ed and
competent personnel are allowed to undertake the
commissioning of the heater.
Note:
It is also strongly recommended that prior to
commissioning the engineer familiarises himself with; the
information contained within the information pack that
accompanies the heater, the heater itself, and with the
specifi c requirements of the installation /application.
Warning
All unit heaters undergo a rigorous test programme prior to
being despatched, whilst such a programme does involve
pre-commissioning and setting up the heater to operate
effi
ciently and well within its designed operational limits, this
does not mean that on site commissioning is less important
than might otherwise be the case.
The idiosyncrasies of each installation can only ever be
allowed for, through the use of thorough on site
commissioning carried out by trained and experienced
personnel equipped with the correct tools and apparatus.
Note:
It is strongly recommended that equipment used for the
sampling and analysis of fl ue gases is accurate to /-
0.1% and maintained so that it is regularly calibrated.
3.1 Commissioning - Pretest
Check to ensure electrical safety, and inspect and check the oil
installation, testing for leaks.
(a) Ensure that the electrical supply is turned off .
(b) Ensure that the oil supply is turned off .
(c) Check that all panels and fasteners are secure and in place.
(d) Check that the heater is installed so that it is square and
that the support is adequate.
(e) Ensure that warm air delivery outlets are open and that
ducting is adequately supported.
(f) Check that fan is free to rotate and the guards are in place.
(g) Ensure that the fl ue is secure, adequately supported, and
that the various joints are properly sealed.
(h) Check that there is provision for fl ue gas sampling and that
this sample point can be plugged and sealed after
commissioning.
(i) Ensure that the burner is securely attached to the heater.
(j) Test for electrical earth continuity between the heater, oil
pipe work, and mains supply.
(k) Turn on main electrical supply.
(l) Enable fan on via controller by selecting ‘Fan only’; ‘Vent
only’; ‘Vent/Manual’.*
(* dependent on control type supplied. Refer to individual
controller operating manual.)
(m) Check to ensure burner is off but power remains to the
fan. The fan will start enabling fan direction etc to be verifi ed.
Reset Fan on/standby switch to off .
(n) Set room thermostat and time clock to ‘demand’ positions.
(o) Turn mains electrical supply to off , replace and secure
lower louvered panel covering fan and motor assembly.
3.2 Commissioning - Ignition
Caution
It is strongly recommended that the separate manual
concerning the operational details of the burner supplied with
the heater as part of the information package is studied prior
to commissioning.
Time intervals within the ignition sequence will vary slightly
from one model to another.
Warning
Do not proceed with commissioning unless all the criteria
detailed within sections 3.0 and 3.1 have been satisfi ed.
(a) Ensure the electrical supply is turned off .
(b) Ensure that the Oil supply is turned off .
(c) Turn on main electrical supply.
(d) Enable burner via controller by selecting ‘Heat’ (Relay 2);
‘Heat On’; ‘Heat/Auto’. *
(* dependent on control type supplied. Refer to individual
controller operating manual.)
(e) Select ‘on’ position for heater on/standby switch.
(f) Check for the following burner sequence
Interval Operation
1 <5s Combustion air damper actuated, burner fan
motor initiates purge cycle...
2 <40s Solenoid valve opens ignition transformer
provides spark for burner ignition...
-------- E I T H E R --------
3 >15s Ignition failure caused by oil starvation
resulting in burner lock-out/shut-down...
(g) Set heater on/standby switch to standby position
(h) Attach oil manifold (bleed screw and pressure gauge)
(i) Open oil supply valves and bleed air from pipe work and
adjust burner oil pressure as per detailed in burner manual