John Wood Commercial - AJWS - Manual (Page 8)

Drafthood/Damper Installation
Install the supplied drafthood and damper on the flue outlet
collar. Use only the supplied drafthood and damper, DO
NOT use any substitute or alter the components in any way.
Place the damper on the water heater (see figure 3A). Align
the four pilot holes on top of the water heater with the 4 cor-
responding holes on the damper bracket and secure with
the supplied screws. Next, align the drafthood legs with the
4 corresponding pilot holes on top of the water heater and
attach securely with the supplied screws. Locate the wiring
from the ECO, and attach it to the wiring harness on the
damper (see Figure 3A). Once damper is installed, ensure
that the damper position indicator is visible (See figure 3A).
Flue Outlet Reducer
Some units are shipped with a flue outlet reducer (See
Figure 3B). Use only the flue outlet reducer supplied with
this unit. The flue outlet reducer should be connected to the
top of the flue damper and sealed by high temperature sili-
con. The vent pipe must be installed according to all local
and state codes or, in the absence of local and state codes,
the “National Fuel Gas Code”, ANSI Z223.1(NFPA 54)-latest
edition. Canadian installations must be performed in accor-
dance with CAN/CSA-B149.1.
WATER SYSTEM PIPING
Piping Installation
Piping, fittings, and valves should be installed according to
the installation drawing (Figure 4). If the indoor installation
area is subject to freezing temperatures, the water piping
must be protected by insulation. Water supply pressure
should not exceed 80% of the working pressure of the water
heater. The working pressure is stated on the water heater’s
data plate. If this occurs, a pressure reducing valve with a
bypass should be installed in the cold water inlet line to the
entire system. This should be placed on the supply to the
entire structure in order to maintain equal hot and cold water
pressures.
Note: Water supplied to the unit that exceeds 12 grains
(205 mg/l) total hardness may reduce the life and perform-
ance of the water heater. Depending on the degree of hard-
ness, it is recommended that either a water pre-treatment
system or a water softener be installed and properly main-
tained.
Important: Heat cannot be applied to the water fittings on
the water heater as they may contain nonmetallic parts. If
solder connections are used, solder the pipe to the adapter
before attaching the adapter to the hot and cold water fit-
tings.
1.
The water heater may have three water piping connec-
tion points. The top and front are 1 - 1/2” NPT and the
connections on the back of some heaters are 2” NPT.
When using front or back connections a combination
nipple inlet tube is required (top entry uses a dip tube).
Any one of the options listed in Table 5 may be used.
For availability contact 1-888-479-8324.
8
Do not operate heater with damper in closed
position, it must be in the open position dur-
ing water heater operation. Do not negate
the action of any existing safety or opera-
tional controls.
WARNING
Bracket screws
Draft hood screws
Draft hood
Damper motor
Damper wiring harness
ECO wiring harness
Damper in OPEN position
Damper wiring harness
Damper motor
Damper position indicator
Figure 3A: Flue Damper Assembly
Damper in OPEN position
Damper wiring harness
Damper motor
Flue outlet reducer High
temperature
silicon sealant
Figure 3B: Flue Outlet Reducer