Operation - BENSON 30 Installation And Operating Manual

3. Commissioning.
Warning
It is a requirement that only suitably qualified 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
specific requirements of the installation /application.
Warning
All Cabinet 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
efficiently 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 flue gases is accurate to within +/-
0.1% and maintained so that it is regularly calibrated.
3.1 Commissioning - Pretest
Check to ensure electrical safety, and inspect and check the
Gas installation, testing for leaks.
(a) Ensure that the electrical supply is turned off.
(b) Ensure that the gas 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) Ensure that if filter assemblies are fitted that they are secure
and correctly located.
(g) Check that air inlets are clear and that return air paths are
adequate.
(h) Ensure that the flue is secure, adequately supported, and
that the various joints are properly sealed.
(i) Check that condensate trap and drain facilities are
adequate.
(j) Check that there is provision for flue gas sampling and that
this sample point can be plugged and sealed after
commissioning.
(k) Check that the fan stat settings has not been disturbed.
(l) Remove lower panel and check motor and fan drive system
for integrity of joints, check pulley alignment, fan rotation, and
belt tension (see section 4.2).
(m) Ensure that the burner is securely attached to the heater.
(n) Test for electrical earth continuity between the heater, gas
pipe work, and mains supply.
(o) Turn on main electrical supply.
(p) Enable fan on via controller by selecting 'Fan only'; 'Vent
only'; 'Vent/Manual'.*
(* dependent on control type supplied. Refer to individual
controller operating manual.)
(q) Check to ensure burner is off but power remains to the
fan. The fan will start enabling fan direction etc to be verified.
Reset Fan on/standby switch to off.
(r) Set room thermostat and time clock to 'demand' positions.
(s) Turn mains electrical supply to off, replace and secure lower
louvered panel covering fan and motor assembly.
3.2 Commissioning - Ignition
Warning
Do not proceed with commissioning unless all the criteria
detailed within sections 3.0 and 3.1 have been satisfied.
(a) Ensure the electrical supply is turned off.
(b) Ensure that the gas 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 Pilot valve opens ignition transformer
provides spark for burner ignition...
-------- E I T H E R --------
3 >40s Ignition failure caused by gas starvation
resulting in burner lock-out/shut-down...
(g) Clear burner lockout using burner reset function.
(h) Set heater on/standby switch to standby position
(i) Open gas supply cocks. Repeat steps 3.1 q, and 3.2 c,e,f.
Doc No. 20-45-159 Page 45 of 60