John Wood Atmospheric Gas (Standard) - Manual (Page 5)

5
TYPICAL INSTALLATION
GET TO KNOW YOUR WATER HEATER - GAS MODELS
A Vent Pipe
B Draft Hood
C Anode (Not Shown)
D Hot Water Outlet
E Insulation
F Gas Supply Piping
G Manual Gas Shut-off Valve
H Ground Joint Union
I Drip Leg (Sediment Trap)
* INSTALL IN ACCORDANCE
WITH LOCAL CODES.
* DRIP LEG AS REQUIRED
BY LOCAL CODES.
J Inner Door
K Outer Door
L Union
M Inlet Water Shut-off Valve
N Cold Water Inlet
O Inlet Dip Tube
P Temperature-Pressure Relief Valve
Q Rating
Plate
R Flue Baffl e
S Gas Control Valve/Thermostat
T Drain
Valve
U Manifold/Burner Assembly
V Flue
W Metal Drain Pan
X Piezo Igniter
Y Base-Ring
Filter
* ALL PIPING MATERIALS TO BE
SUPPLIED BY CUSTOMERS.
TO VENT
TERMINATION ON
ROOF
A
B
D
F
G
H
I
W
V
U
T
S
O
R
J
K
Q
VACUUM RELIEF
VALVE
*INSTALL PER
LOCAL CODES
INSTALL THERMAL EXPANSION
TANK IF WATER HEATER IS
INSTALLED IN A
CLOSED WATER SYSTEM
M
N
L
E
P
X
Y
DISCHARGE PIPE
(DO NOT CAP OR PLUG.)
12” (300 mm)
MAXIMUM AIR GAP
FLOOR DRAIN
(S) GAS CONTROL VALVE/
THERMOSTAT
MANIFOLD
TUBE
IGNITER WIRE
MAIN BURNER
PILOT TUBE
THERMOPILE
(U) MANIFOLD/BURNER ASSEMBLY
MANIFOLD DOOR
VAC
Gas Control/Temperature Knob
Status
Light
Igniter
120°F (48.9°C)
Mark
Temperatures shown are approximates and may vary.
FIGURE 1A.