1307SDH_RDH--EN,
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COMMISSIONING, LIGHTING and OPERATION
9.1 Commissioning
Normally Reznor SDH/RDH air heaters do not require
commissioning. Final testing after production ensures
that, if installation has been carried out by a suitably
qualified person and strictly in accordance with this
document, the appliance is ready to be taken into
service.
Note :
Outdoor commissioning work on RDH appliances
should not be undertaken during wet conditions, a
second person must be available to provide assistance in
the event of an emergency.
9.1.1
Check
s
Prior to start up heater, carry out following checks to
ensure :
o
Check suspension (SDH) or unit support (RDH). Unit
must be secure. Verify that no other parts are fitted
which are not individually supported and secured.
o
Check piping for leaks and proper gas line pressure.
Bleed gas lines of trapped air.
o
Check electrical wiring and ensure that wiring
conforms to the wiring diagram. Be sure all wire
sizes meet requirements.
o
Phase supply cable to correct terminals.
o
Check polarity. Verify that line voltage exists
between the black “L1” and earth ground.
o
Verify that the appliance is earthed by conducting an
earth continuity test.
o
Current rating and fuse value.
o
Correct supply gas pressure.
o
Correct burner gas pressure.
o
Satisfactory & smooth ignition.
Supplementary checks in case of an SDH installation:
o
Check clearances from combustibles. Requirements
are in section 5.
o
Check vent system to be sure that it is installed
according to the instructions in section 6, venting
requirements.
9.1.2
Heater start-up
For your safety, follow the instructions
exactly otherwise damage or injury
could occur !
o
This heater does not have a pilot flame. It is
equipped with an ignition device that automatically
lights the burner. Do not try to light the burner by
hand.
o
Before operating, smell all around the heater area
for gas. Be sure to smell next to the floor because
propane gas is heavier than air and will settle near
the floor.
o
Do not use this appliance if any part has subjected
to water ingress. Immediately call a qualified
service technician to inspect the appliance and to
replace any part of the control system and any gas
control.
o
When overheating occurs or when gas supply is not
turned off, shut the manual gas tap before turning
off the electric power.
o
In addition to the above requirements checks to
ensure that the fan performance and motor load
factors are correct for the application and in
accordance with the appliance data plate.
9.1.3
Drives : general and adjustments
Adjustment may be necessary to set the fan duty for the
static pressure and motor load requirements. Before
starting work on the fan assembly:
o
Set external controls to off or their lowest setting.
o
Turn
OFF the gas supply to the air heater.
o
Switch
OFF the electricity supply to the air heater
after the air circulating fan has stopped.
o
Carry out adjustments as appropriate.
N.B. Rotational speed checks should be carried out
using an infrared tachometer or stroboscope.
Adjusting the fan speed can be carried out by altering
the diameter of the adjustable drive pulley on the motor
shaft.
o
Loosen the belt tension device and remove he
drive belt.
o
Refer to figure 11 and note that the outer section
of the drive pulley is secured by a hexagon socket
screw to a flat on the pulley hub, this is positioned
by loosening the hexagon socket screw
sufficiently to enable the pulley to be either
opened or closed by turning it on the thread on
which it is engaged.
o
It should be noted that one complete turn of the
pulley half is equal to approximately 8% of the fan
speed. Closing the pulley increases the speed and
opening decreases the speed.
o
After making speed adjustments tension belt in
accordance with the dimensions given in figure
11 and check pulley alignment to ensure the belt
runs correctly.
N.B.
Always ensure that the pulley is tightened onto a
flat of the hub before switching on the fan, even when
testing a reset condition.
Opening the pulley too far will cause the belt to
touch the bottom of the V grove resulting in a
significant reduction of belt life time and loss of
grip.
If the amount of adjustment is not achieved with the
range obtainable with the pulleys fitted, it will be
necessary to change the driven pulley fitted on the
blower and possibly the size of the drive V belt. After
adjustment ensure the motor load rating is not exceeded!
9
