3-5
STARTUP AND COMMISSIONING
TANKLESS WATER HEATER 199
Figure 34: Back Flow Valve
Figure 35: Blower and Gas Valve Assembly
WARNING
Each unit is equipped with
a back flow valve installed
at the outlet of the fan.
Inspect the back flow flapper
annually.
3.4.1 Gaining access to combustion chamber, burner
removal instructions
DISASSEMBLY
1.
Turn off the main power switch to the unit.
2.
Turn off the gas supply valve to the unit.
There is no need to drain the unit unless the unit will be exposed to freezing
conditions while off.
3.
Remove the front cover, and allow the unit to cool.
4.
Unplug the electrical connector at the gas valve and fan.
5.
Loosen the lower gas valve connection nut.
NOTE:
There is an O-ring in the lower gas connection. Cover the gas piping
connections to prevent debris from entering the gas piping.
6.
Remove all 6mm Allen bolts and lock washers from the heat exchanger
cover and carefully remove the front cover complete with the fan and the gas
valve attached.
7.
Place the heat exchanger cover in a safe location.
NOTE
The Caution reguarding
burner refractory on page
4-2 of this manual must be
observed.
CAUTION
When removing the heat
exchanger cover in step 6,
be careful not to damage the
burner and refractory material
located on the opposite side
of the heat exchanger cover.
Use caution when handling
refractory materials. See
Caution on page 4-2.