DU/SD SERIES INSTALL OPERATION MAINTENANCE MANUAL
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3.3.2 User Control Configuration Options
There are 2 primary control options for AIRA DU/SD units, Wall switch and BMS. Units are specified with either a wall
switch or capability to be wired for BMS interface. BMS specified units have a different RLU program to those specified
with the wall switch. Wall switch units have a Siemens room thermostat supplied. Dual heat exchangers have a
different control setup. Refer to Aira Manual AM006.
OFF
FAN SWITCH OFF, OTHER SWITCHES ANY POSITION.
LOW VENT
FAN SWITCH ON, HEAT SWITCH OFF, HIGH-LOW SWITCH IN LOW POSITION
HIGH VENT
FAN SWITCH ON, HEAT SWITCH OFF, HIGH-LOW SWITCH IN HIGH POSITION
HEAT
FAN SWITCHON, HEAT SWITCH ON, HIGH-LOW SWITCH IN LOW POSITION.
Note that heating will not operate with high-low switch in high position.
Table 9: User Controls
3.3.3 Blower / Fan Setup
Units fitted with a blower are factory fitted and tested. If a 3rd party fan is installed it is the customers responsibility to
ensure that it is commissioned and will provide adequate airflow across the heat exchanger.
3.3.4 Electrical Differences for Dual Heat Exchangers
Dual heat exchanger units have two control boxes. One box is the master and the other the slave. Refer to Aira Manual
AM006 for dual heat exchangers.
The unit will be supplied with two thermostats. The room thermostat measures temperature in the room the set point
thermostat allows for adjustment of the set temperature. Both thermostats are to be installed within the area being
heated.
3.4 GAS CONNECTIONS
3.4.1 Gas Supply
This unit must be installed in accordance with AS/NZS 5601.1. Before connecting the unit to the gas line. The gas line
must be fully purged and checked to ensure that they are free of dirt and foreign objects.
The gas supply pipe must be of adequate size to the heater and all gas appliances onsite. The screwed inlet
connection to the heater
“MUST NOT”
be used as an indication of the gas line’s sizing required. Units are fitted with
a ¾” Inch Gas valve this doesn’t indicate the line diameter size. Gas lines must be sized to consider the length of the
pipe and any other attached appliances to ensure adequate flow and pressure are supplied to the unit. Gas line size
will be dependent upon flow rate required and line length. Refer to AS 5601.1 Appendix F for sizing of supply gas line.
The gas supply line must bear no load and be adequately supported and align with the units gas train. Do not
overtighten gas valve connection. A cracked body on inlet side of gas valve will not be covered by warranty. Check all
gas connections for leaks using soap solution or suitable gas leak detection fluid.
AMI042-A
AMI028-A
Figure 10: Thermostat
Figure 11: Wall Switch
INSTALLATION INFORMATION