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Rheem RTG-74X Installation Instructions page 4

Tankless water heater recess box
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Thermostat Wiring
the Thermostat wire(s). Route the wire through the
hole and connect the wire to the water heater accord-
ing to the instructions in the Use and Care Manual.
Typical Installation -
Recess Box
Isolation Valves
Pressure
Relief Valve
Power Disconnect
Final Assembly and Inspection
and Care Manual for complete details about the water heat-
er. Check all water and gas connections for leaks.
Seal all openings around pipes and wires with an outdoor
grade silicone sealant. Seal the joint between the recess box
Typical Installation and Finish -
Lap Siding
Drip Ledge
Siding or Brick
- A hole is provided for
Figure 6
Wall Sheathing
(Brick, Vinyl, etc)
Outdoor
Tankless Water
Heater
Gas Service
Thermostat
- Follow the Use
Figure 7
Brick Siding
Brick Lintel
Recess Box
Sealing and Finish -
Outer Door
Caulk Joint Between Siding
and Recess Box
Warning
!
Valve
must be sealed to prevent water infiltration in to the wall. Fail-
ure to do so could result in damage to the wall.
and the siding or brick of the house with a silicone based
Wire
sealant to prevent water from getting behind the box into
the wall.
Installing the Door
at a slight angle. Slip the door into the channel at the top of
the recess box. Next push the bottom of the door flush with
the recess box and slid down into the channel at the bottom
of the enclosure. Do not block any air openings of the door
Security Clip
into the slot at the bottom of the door from the backside so
it points straight down through the bottom of the door. Lift
the door into place per the instruction above. As the door is
being slid down into place, guide the security clip into the
slot in the bottom channel of the recess box.
Once the clip is in place, secure with a suitable means (small
padlock, security tag, etc.).
Security Clip -
Padlock
4
Figure 8
Caulk Joint Between Siding
Drip Ledge
and Recess Box
Siding or Brick
Seal all openings around pipes
and wires with a silicone sealant
- All openings in the bottom of the recess box
- Lift the door up from the bottom
- Before installing the door, slide the clip
Figure 9
Outer Door
Security Clip

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