John Wood Direct Vent Models No Longer in Production - Manual (Page 3)

Figure 2A - Installation Components.
Figure 2B - Installation Options.
Figure 2B shows the location of a pressure relief and/or
expansion tank if a check valve or pressure reducing
valve is in the cold water supply to the house.
Use OPTION 1 or 2 whichever is more convenient. If
pressure relief valve is used, select one with a setting
172 kPa (25 psi) below the valve rating at tank.
Specially For Direct Vent Water Heater:
Make certain to observe the vent location limitations
complying with the CSA B149 Natural Gas and Propane
Installation Code or ANSI Z223.1 National Fuel Gas
Code and/or local codes. There is some important infor-
mation shown in Figure 3.
For a second or more direct vent unit, the distance
between vent terminals must have a minimum of 305mm
(12 in.).
INSPECT SHIPMENT –– There may be hidden damage
caused by transit. Check to be certain all parts of the
venting system, as shown in Figures 3A through 3M, are
present. Inspect the upper and lower air inlet boxes, rear
air tube and all parts of the venting system (see Figure
2A).
CAUTION
If there are any damaged parts, DO NOT install this water
heater. Report any shortage to your distributor and dam-
age to your carrier.
Note: The four fasteners that are required to secure the
vent terminal to the exterior wall are not provided. These
should be screw type (not nails) chosen for the type of
construction and obtained locally.
CAUTION
Cut edges of corrugated (flex) pipe are extremely sharp.
Wear gloves when handling.
- 3 -
152mm
(6 in.)
SEAL TIGHTLY
OPTION 1
OPTION 2
HOT WATER OUTLET
GAS SUPPLY MANUAL
SHUT-OFF VALVE
SEDIMENT TRAP
UNION - GROUND
JOINT TYPE
FLOOR DRAIN
TEMPERATURE & PRESSURE
RELIEF VALVE
COLD WATER INLET
GAS CONTROL
UPPER AIR
INLET BOX
LOWER AIR
INLET BOX
REAR AIR TUBE
DRAIN PAN
EXPANSION TANK
WATER SUPPLY
TO HOME
WATER METER
WITH BACKFLOW
PREVENTER
PRESSURE
RELIEF VALVE
OVERFLOW
WATER SUPPLY
TO METER
FLOOR DRAIN
Figure 3 - Vent Location Limitations
Vent Terminal must be located at
least 305mm (12 in.) from
Windows, Doors, or any other
Opening through which flue
gases could enter the building.
Any Forced Air Inlet
into the building
Vent
Terminal must be located at least 457mm
(18 in.) from any overhang or building corner or other irregularity
.
305mm (12 in.) Min.
above grade. Higher in
Areas of Heavy Snowfall
Within 3m (10 ft.)
915mm
(36 in.)
Min.
305mm
(12 in.)
Min.
Vent terminal must
be located at least
915mm (36 in.)
above any Forced Air
Inlet into the building
within 3m (10 ft.) of
the Vent Terminal
457mm (18 in.)
Min.