38
Installation and operation manual
–
DTH-V9-2020
In emergency situation
When it is necessary to stop the heater in case of emergency, turn the main switch to the
OFF
position and close the gas supply by closing the manual supply valve on the outside of the heater.
Extended shutdown
When the duct furnace is not to be used for a long period of time, it is recommended to cut and plug
the gas supply.
Before starting the unit after a shutdown, it is recommended to do an inspection to make sure
everything is in order.
Restarting after an extended shutdown
•
Ventilation section (fan by other)
1.
Make sure the disconnect switch in
OFF
position.
2.
Check fan belts and adjust or replace if necessary.
3.
Check the condition of filters and replace if necessary.
4.
Make sure nothing partially or completely obstructs the air inlet and air outlet of duct
furnace.
5.
Ensure that nothing stops the proper functioning of the inlet damper and/or air outlet (if
applicable).
6.
Place the ventilation disconnect switch in
ON
position.
•
Burner
1.
Make sure that all manual gas valves are open.
2.
Check for alarms on the flame safeguard (see
Flame safeguard alarms
section).
3.
Check alarm message on HMI touch screen panel.
4.
Create a heat demand (heating contact
ON
and modulation signal over 2.5Vdc)
5.
Make sure that the burner fan motor operates.
6.
Make sure the burner ignites correctly.
7.
Repair if necessary.
8.
Repeat the start-up procedure.
Start / stop recommendations
