Critical Installation Warnings; General Installation; Warning Explosion - Atwood G4-7 Manual

CRITICAL INSTALLATION WARNINGS

• Install in recreation vehicles only. RV's are recreation vehicles
designed as temporary living quarters for recreation, camping, or
travel use having their own power or towed by another vehicle.
• All combustion air must be supplied from outside the RV, and all
products of combustion must be vented to outside the RV.
• vent water heater with venting system serving another appli-
DO NOT
ance.
• vent water heater to an outside enclosed porch area.
DO NOT
• Protect building materials from flue gas exhaust.
• Install water heater on an exterior wall, with access door opening to
outdoors.
• modify water heater in any way.
DO NOT
• alter water heater for a positive grounding system.
DO NOT
• HI-POT water heater unless electronic ignition system (cir-
DO NOT
cuit board) has been disconnected.
• use battery charger to supply power to water heater even
DO NOT
when testing.
-
USA AND CANADA FOLLOW ALL APPLICABLE STATE AND LOCAL CODES
IN THE ABSENCE OF LOCAL CODES OR REGULATIONS
• Recreation Vehicles ANSI A119.2/NFPA 501C.
• National Fuel Gas Code ANSI Z223.1 and/or CAN/CGA B149 Installation
Codes
• Federal Mobile Home Construction & Safety Standard, Title 24 CFR, part
3280, or when this Standard is not applicable, the Standard for Manufactured
Home Installations (Manufactured Home Sites, Communities and Set-Ups),
ANSI A255.1 and/or CAN/CSA-Z240 MH Series, Mobile Homes.
• National Electrical Code ANSI/NFPA No. 70 and/or CSA C22.1
• Park Trailers A119.5
• CSA standard Z240 RV Series, Recreational Vehicle.

GENERAL INSTALLATION

Below is the most common type of installation for the water heater.
However, there are other approved methods such as baggage com-
partment (refer to MPD 90093) and flush mounting installations (refer
to MPD 93948). Consult your Field Auditor, Account Manager, or the
Atwood Service Department if you have additional questions.
1. Locate water heater on floor of coach before erecting side walls.
The water heater tank must be permanently supported at the same
level as the bottom of sidewall cutout (by the floor or a raised floor).
2. To install water heater on carpeting, you must install appliance on a
metal or wood panel that extends at least three inches beyond the
full width and depth of appliance.
3. If water heater is installed where leakage of connections or tank will
damage adjacent area, install a drain pan which can be drained to
out side of coach, under water heater.
4. Connect both 1/2˝ NPT water lines - hot water outlet female
( 1-A) and cold water inlet female (
FIG
lines ( 1-C).
FIG
a. Allow flexibility in water and gas lines so you can pull unit for-
ward through wall one inch past skin (
b. Seal gas line entrance opening by sliding grommet (
3/8˝ tubing ( 1-F) before flaring tubing (
FIG
and grommet through opening in housing (
fitting ( 1-E) and press grommet into opening. If gas line tubing
FIG
is already flared, cut grommet on one side. Place split grommet
over gas line and press it into opening.
c. Always use pipe lubricant on threads when connecting hot and
cold water couplings. A suitable plastic fitting is recommended.
PRODUCT DAMAGE
• Do not pull on main burner tube (
5. Erect side walls and cut opening. See chart and
Frame with 2x2 lumber (or equivalent).
-
,
REFER TO CURRENT STANDARDS OF
1-B) and 3/8˝ flared LP gas
FIG
2.
FIG
1-D) onto
FIG
1-F). Pull gas line
FIG
1-C). Connect flare
FIG
CAUTION
9-C).
FIG
2-A & B.
FIG
CUTOUT
CAPACITY
Gallon A
4 - 6 12-5/8˝
10 15-3/4˝
MINIMUM CLEARANCE FROM COMBUSTIBLE CONSTRUCTION
Sides: 0˝
Back: 0˝
6. Bend all flanges 90˚ along scored lines (
7. To prevent water leaks caulk thoroughly around opening, including
bend slots ( 3-A). Butyl Tape (1˝x1/8˝) may be substituted for
FIG
caulking material.
8. Push unit against caulking, secure 4-corner brackets
coach with No.8 - 3/4˝ round head screws (not furnished) or equivalent.
Complete the installation by inserting the same type of #8 screws in the
holes provided around the flange of the water heater housing.
9. Attach access door (
FIG
a. Snap hinge pin (
FIG
b. Slide cover ( 5-C) onto hinge pin.
FIG
c. Slide hinge pin into cover, snapping into clip at same time (
: To remove hinge pin, support access cover and apply force to
NOTE
corner of hinge pin as shown
10. Disconnect unit and its individual shut-off valve from gas supply
line during any pressure testing of system in excess of 1/2 PSIG
:
(3.4 kPa, 14˝ water column [W.C.]).
than maximum indicated on rating plate of gas valve (13˝ W.C.).
Isolate unit from gas supply line by closing its individual manual
shutoff valve during any pressure testing ≤ 1/2 psig.
FIRE AND/OR EXPLOSION
• use matches, candles or other sources of ignition when
DO NOT
checking for gas leaks.
11. Turn on gas and check water heater and all connections for gas
leaks with leak detecting solution.
12. Fill water heater tank, check all connections for water leaks (
A & B).
PRESSURE-TEMPERATURE RELIEF VALVE
This water heater is equipped with a temperature and pressure relief
valve ( 10) that complies with standard for Relief Valves and
FIG
Automatic Gas Shutoff Devices for Hot Water Systems, ANSI Z21.22.
This valve is a safety component and must not be removed for any reason
other than replacement.
place a valve, plug or reducing coupling on outlet part of
•
DO NOT
relief valve.
If you use a discharge line, do not use a reducing coupling or other
restriction smaller than outlet of relief valve. Allow complete drainage
of both valve and line.
FOR REPLACEMENT PARTS:
• install anything less than a combination temperature-pressure
DO NOT
relief valve certified by a nationally recognized testing laboratory that
maintains periodic inspection of product of listed equipment or materi-
als, as meeting requirements for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22. Valve
must have a maximum set pressure not to exceed 150 psi.
• Install valve into opening provided and marked for this purpose on
water heater.
• Installation must conform with local codes or in the absence of local
codes, American National Standard for Recreational Vehicles, ANSI
A119.2/NFPA 50IC.
• For an external electrical source, ground this unit in accordance with
National Electrical Code ANSI/NFPA70.
Your Atwood gas water heater is now ready for operation. Continue to
HOW TO OPERATE YOUR WATER HEATER.
Electronic Ignition
continue to
Pilot Relight continue to Pilot Relight WIRING INSTRUCTIONS.
2
CUT OUT DIMENSION
B
16-1/4˝
16-1/4˝
Top: 0˝
Bottom: 0˝
3).
FIG
5).
5-A) into clip ( 5-B).
FIG
5-E.
FIG
set inlet pressure higher
DO NOT
WARNING
WARNING
EXPLOSION
Electronic Ignition WIRING INSTRUCTIONS.
DEPTH
C
17-5/8˝
20-5/8˝
4-A to
FIG
5-D).
FIG
1-
FIG