A.O. Smith BTH-120 through BTH-500, Инструкция по эксплуатации

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14. If installing 3 inch intake air pipe connect the intake air pipe to
the intake air connection on the water heater.
15. If installing 4 inch intake air pipe transition to 3 inch pipe at
the intake air connection on the water heater as shown in
Figure 20. The field installed 3” pipe between the intake air
connection and the 4” x 3” reducer coupling should be 18
inches (45 cm) or less in length.
3” PIPE FACTORY
INSTALLED
4” PIPE FIELD
SUPPLIED
3” PIPE FIELD
SUPPLIED
4” x 3” REDUCER
FIELD SUPPLIED
3” COUPLING OR TEE
FACTORY INSTALLED
INTAKE AIR CONNECTION
INTAKE AIR CONNECTION
INTAKE AIR
COMBUSTION
BLOWER
figure 20
INSTALL TEE FITTING AS CLOSE TO WATER HEATER
INTAKE AIR CONNECTION AS POSSIBLE
INTAKE AIR CONDENSATE TEE INSTALLATION
FIELD SUPPLIED
3” x 3” x 1/2” TEE
WITH HOSE BARB
FITTING INSTALLED
FACTORY
INTAKE AIR
CONNECTION
INTAKE
AIR
PIPING
CONNECT FIELD
SUPPLIED FLEXIBLE
DRAIN HOSE TO BARB
FITTING AND FORM A
LOOP WATER TRAP IN
DRAIN HOSE
RUN DRAIN HOSE
TO SUITABLE FLOOR
DRAIN SEPARATELY
FROM OTHER
CONDENSATE DRAINS
figure 21
11. If installing 3 inch vent pipe connect the vent pipe to the
exhaust elbow on the water heater.
12. If installing 4 inch vent pipe transition to 3 inch pipe at the
exhaust elbow on the water heater as shown in Figure 18 on
page 25. The field installed 3” pipe between the exhaust elbow
and the 4” x 3” reducer coupling should be 18 inches (45 cm)
or less in length.
13. Ensure the Intake Air Screen on the Intake Air Connection to
the water heater is removed before connecting the intake air
pipe to the water heater. See Figure 19.
Do not obstruct water heater air intake.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
note: Do not leave the screen inside the Intake Air
Connection for Direct Vent installations. Once the intake
air pipe is installed the screen will be hidden from view and
may become clogged with debris over time. This will cause
improper combustion and may also lead to Blocked Intake
Air fault conditions and associated control system lock outs.
INTAKE AIR SCREEN
(remove for Direct Vent)
120,000 & 150,000
Btu/hr MODELS
199,000 & 250,000
Btu/hr MODELS
3 INCH INTAKE AIR CONNECTIONS
FACTORY INSTALLED
INTAKE AIR SCREEN
figure 19