Vent Pipe Assembly; Venting - A.O. Smith Gphe 50 Instruction Manual

Never use this water heater unless it is completely full of water. To prevent
damage to the tank, the tank must be filled with water. Water must flow
from the hot water faucet before turning "ON" gas to the water heater.
To fill the water heater with water:
1. Close the water heater drain valve by turning handle to the right
(clockwise). The drain valve is on the lower front of water heater.
2. Open the cold water supply valve to the water heater.
note: the cold water supply valve must be left open when the
water heater is in use.
3. To insure complete filling of the tank, allow air to exit by opening nearest
hot water faucet. Allow water to run until a constant flow is obtained.
This will let air out of the water heater and the piping.
4. Check all water piping and connections for leaks. Repair as needed.

vent pIpe asseMBlY

There are three parts of the vent pipe assembly that connect the water
heater exhaust (located on lower back side of water heater) to inlet of the
blower assembly (mounted on top of water heater) as shown in Figure
1. These parts will need to be assembled according to the instructions
in the VENT PIPE PREPARATION section of this manual. These PVC
parts should be assembled with ASTM D-2564 grade cement.
Assemble Vent Pipe Assemblies #1, #2 and #3 (See Figure 1) prior
to cementing. The preferred orientation of Vent Pipe Assembly #1
(Condensate U-Assembly) is shown in Figure 16. However this
assembly may be rotated to a different orientation as needed for the
specific installation requirements. Note the rotational orientation of
each part by marking a line several inches long across the joints.The
long tube of Vent Pipe Assembly #2 should be approximately
vertical. If it is found that either of the two pieces of pipe in Vent
Pipe Assembly #2 are too long for proper fit-up, then remove as
little material as possible to improve the fit-up. Keep in mind that
the pipes will insert slightly further into the elbows when cement
is applied as it acts as a lubricating agent. The vertical distance
from the bottom of the Condensate U-Assembly to the floor that
supports the water heater should be approximately 0.25" (0.64 cm),
see Figure 16. Disassemble the parts and cement back together
using the alignment marks. After the cement dries, attach the
assembly to the blower and the water heater exhaust using the
supplied rubber boots and hose clamps.
A condensate trap is incorporated in the bottom of this vent pipe assembly.
See the CONDENSATE section of this manual for further details.

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