1307SDH_RDH--EN,
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Attention: Serious damage can occur to burner
relay when faulty connection of thermostat, reset
switch or burner failure lamp. Switching of wires
for reset switch and flame failure (e.g. in a remote
control box) will destroy the burner relay.
GAS CONNECTION
Connection to a gas service may only be carried out by
suitably qualified persons.
All piping must be in accordance with requirements
outlined in the National Gas Codes (different for each
country). Gas supply piping installation should also
conform to good practice and any local codes. Support
gas piping with pipe hangers, metal strapping, or other
suitable material.
Do not rely on the unit to support the gas
pipe!
All sealing products shall be resistant to the action of
liquefied petroleum gas or any other chemical
constituents of the gas being supplied.
Install a ground joint union and manual shutoff the gas
cock upstream of the unit control system (see figure 9).
The unit is equipped with a nipple that extends outside
the cabinet. The gas connection is 3/4”.
Leak test all connections by brushing on a leak
detecting solution.
Check that the gas category is in accordance with the
data described on the air heater.
An adequate gas supply sized to provide the dynamic
pressure for the volume required by the air heater(s) is
essential to maintain the nominal heat input.
Ensure that a gas supply line includes a filter and has
been tested and purged in accordance with prescribed
practice prior to commissioning and taking the air heater
into service.
This appliance is equipped for a
maximum gas supply pressure of
50mbar.
Pressure testing supply piping: test
pressures above 50mbar: disconnect
the heater and manual valve from the
gas supply line that is to be tested. Cap
or plug the supply line..
Figure 9a : Gas connection detail of SDH unit
Figure 9b : Gas connection detail of RDH unit
NEVER use a FLAME to test for GAS
SOUNDNESS !
ELECTRICAL CONNECTION
8.1
Electrical supply & connections
The electrical installation may only be carried out by an
appropriately qualified person current to IEE
Regulations. The supply line to the heater should
include a main switch adjacent to the appliance. The
minimum
clearance
distance between the contacts must
be more than 3 mm.
All electrical connections should be made in the heater
control compartment (refer to figure 10). Connections
should be in accordance with the terminal markings and
the wiring diagram affixed to the air heater.
The minimum external control required for the air heater
is a room thermostat.
It is essential that the main input
line and neutral to terminals L and N remain
live at all times even when the heater is switched off
to ensure correct operation of the unit and to let the
fan operate independent of the heating control. Never
incorporate controls that isolate the appliance
electrically.
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