Installation Manual

3
Introduction
6 720 811 758 (2014/05)
2 Introduction
Tools needed:
• Phillips head screw driver
• Small flat head screw driver
• Needle-nosed pliers
3 Preparation
▶ Push power button to "OFF" and unplug power cord.
▶ Loosen two Phillips head screws on bottom rear of front
cover.
▶ Pull cover bottom outwards then lift cover upwards to
remove.
4 Appliance identification
The high temperature activation is different for RTG 199ME
and RTG 199HE models. Here is how to identify which model
you have:
For RTG 199ME models see chapter 6, for RTG 199HE models
see chapter 7.
5 Control unit service position
▶ Remove three Phillips screws on front of control unit
(Fig. 1).
Fig. 1 Control unit front
▶ Turn control unit to expose the rear.
▶ Remove rear hatch from control unit to expose circuit
board electrical connections. (Fig. 2).
Fig. 2 Control unit rear
▶ Control unit rear (wiring not shown for clarity purposes).
Fig. 3 Control unit rear
Note: The installation of this high
temperature kit will reduce the heat
exchanger warranty to 5 years from the date
of original installation and operation. For
more details consult the water heater’s
installation manual for warranty period.
NOTICE: Damages to the PCB!
▶ Avoid touching printed circuit board
(PCB) as static discharge may damage
circuitry.
DANGER: Risk of fatal injury from electric
shock!
▶ Before servicing the water heater,
unplug power supply cord from outlet.
Failure to do so could result in severe
personal injury or death.
Type Model Number Model
Condensing 7 736 502 725 RTG 199HE
7 736 502 726 RTG 199HE
Table 2
Non-condensing 7 736 502 727 RTG 199ME
7 736 502 728 RTG 199ME
Type Model Number Model
Table 2
6720608920-09.1AL