Condensate; Water Supply; Piping Installation - John Wood POWER VENTED GAS FIRED WATER HEATER Installation And Operating Instructions Manual

Condensate

Condensate formation does not occur in all installations
of power vented water heaters, but should be drained
on installations where it can form in the venting system.
Condensation in the venting system of power vented water
heaters is dependent upon installation conditions including, but
not limited to ambient temperature and humidity of installation
location, ambient temperature and humidity of venting space,
vent discharge and slope, and product usage. In certain
conditions, installations in unconditioned space or having long
horizontal or vertical vent runs can accumulate condensate.
Long lengths of venting that pass through cool/cold areas will
experience condensation. The vent pipe should be sloped
upwards away from the blower assembly, then adequate
means for draining and disposing of the condensate needs
to be made by the installer. If installation conditions cause
condensation, install a condensate trap loop approximately
200mm (8 in.) in diameter using 3/8" plastic hose. Connect
the hose to the built-in drain port of the rubber coupling of the
blower assembly (see Figure 26). Loop the hose in a vertical
position as shown. The tube loop must be fi lled with water at
least half way prior to operating the heater. Ensure the end of
the tube has access to a drain as condensate will fl ow from
the end. Secure the tubing to the side of the heater. Prior to
operating the water heater, make sure the removable cap
is installed on the drain port (if a drain hose is not needed).
Note: This cap must remain in place if a drain hose is not
installed.
HOSE
CONNECTION
PORT FOR
CONDENSATE
DRAIN
DILUTION
INLETS
Figure 26
AIR
BLOWER
ASSEMBLY
200mm
(8 in.) LOOP
TO DRAIN

Water Supply

Piping Installation

Piping, fi ttings, and valves should be installed according to
the installation drawing (Figure 27). Water supply pressure
should not exceed 550 kPa (80psi). If this occurs a pressure
reducing valve and/or an expansion tank may be required.
The pressure reducing valve should be placed on the supply
to the entire house in order to maintain equal hot and cold
water pressures.
Important:
•
Do not apply heat to the water fittings on the heater as
they may contain nonmetallic parts. If solder connections
are used, solder the pipe to an adapter before attaching
the adapter to the hot and cold water fittings.
•
All models contain energy saving heat traps to prevent
the circulation of hot water within the pipes.
•
Always use a proper grade of joint compound and be
certain that all fittings are drawn up tight.
1. Install the water piping and fittings as shown in Figure 27.
Connect the cold water supply to the fitting (3/4" NPT)
marked "COLD" (or "C"). Connect the hot water supply to
the fitting (3/4" NPT) marked "HOT" (or "H").
2. The installation of unions in both the hot and cold water
supply lines is recommended.
3. The manufacturer of this water heater recommends
installing a tempering valve in the domestic hot-water line
as shown in Figure 28. These valves reduce the point-of-
use water temperature by mixing cold and hot water.
4. If installing the water heater in a closed water system,
install an expansion tank in the cold water line as speci-
fied under "Closed System/Thermal Expansion".
5. Install a shut-off valve in the cold-water inlet line. It
should be located close to the water heater and be easily
accessible. The owner/operator must be shown the loca-
tion of this valve and be given instructions on how to use
it to shut off the water to the heater.
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