John Wood Direct Vent - Manuel (Page 8)

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Natural gas and Propane (LP)
main burner with igniter assembly
for 38k to 42k Btu/hr models
31
36
38
39
30
33
34
35
32
37
40
Figure 3
37
Natural gas and Propane
(LP) main burner with igniter
assembly for 47k Btu/hr
models
35
36
34
33
32
31
40 39
38
30
Figure 4
Vacuum relief valve
install per local
codes (not supplied
with heater).
Figure 5
Notes:
*
Items not supplied with the water heater.
** The side recirculation loop connections may not be
used as the primary water inlet and outlet connections.
See “Combo Heating Inlet And Outlet Side Taps”
below.
*** During operation the vent pipe and airbox can get hot.
REPLACEMENT PARTS AND DELIMING PRODUCTS
Replacement parts and recommended delimer may be
ordered through authorized servicers or distributors. When
ordering parts, provide complete model and serial numbers
(see rating plate), quantity and name of part desired.
Standard hardware items may be purchased locally.
COMBO HEATING INLET AND OUTLET SIDE TAPS
Models equipped with Combo Heating capabilities are
shipped with the two side plumbing taps OPEN (items 5
and 8 in Figure 1 and see also Figure 8). If the heater is to
be operated without using the side taps, these openings
must be closed with the two pipe plugs supplied with
the heaters.
HIGH LIMIT CONTROLS (ENERGY CUT OFF)
Thermostat/Water Temperature
This feature is a part of the gas control valve/thermostat
(see Figure 1, item 7) and limits the maximum water
temperature. In the event of the water overheating, this
safety feature shuts off the fuel supply to the burner.