Lochinvar MFH-I&S-02 - Manual (Page 3)

3
MFH-I&S-02
VENTING
Make certain the flue baffle is in place and centered in flue tube. P lace the
draft diverter over the flue opening at the top of the water heater by inserting
the tips of the draft diverter legs into the four (4) holes provided in the water
heater top.
Cut a 7 1/4 inch (18.5cm) diameter hole in the ceiling and roof
directly above the flue of the water heater. Center the water heater beneath
the 7 1/4 inch (18.5cm) diameter holes in the roof and ceiling for proper
alignment of the draft diverter and roof jack vent. Apply non-hardening mastic
on the roof, around the previously cut hole, to form a weather seal with the
flashing of the gas vent roof jack assembly. Insert gas vent roof jack assembly
from above and fasten the flashing to the roof through the pre-punched holes
in the flashing. Note: Only the roof jacks listed in Figure 4 can be used
on this water heater. Apply additional non-hardening mastic to complete
the weather seal. Slip the 3inch (7.62cm) vent connector extension that is
shipped telescoped, into the gas vent roof jack assembly down onto the draft
diverter that is secured to the top of the water heater and fasten with the two
(2) sheet metal screws provided.
COMBUSTION AIR SUPPLY
All combustion air must be supplied from outdoors by one of the following
installation methods and as illustrated in (Figure 4). The flow of combustion
and ventilating air must not be obstructed. Adequate air must be supplied for
combustion and ventilation. An insufficient supply of air will cause recirculation
of combustion products resulting in air contamination that may be hazardous to
life. Such a condition often will result in a yellow, luminous burner flame,
causing carboning or sooting of the combustion chamber, burners and flue
tubes with possible damage to the heater.
Air Intake Installation - An optional 3" (7.6cm) diameter telescoping air
intake and leg enclosure are required to supply fresh air to the water heater for
combustion for 30 gallon (113.5L) water heaters and for 40 gallon (151.4L)
water heaters. Note: When a mobile home is tightly skirted, an air
inlet opening in the skirting must be provided. The opening shall
have a minimum free area of at least 9 in
2 (22.9cm 2 ). If the opening
is screened or covered with a louver, the total free area must be at
least 9 in
2 (22.9cm 2 ). The following steps must be followed for proper
installation of these air supply components: (Refer to Figure 4.)
1. After selecting the proper location for the water heater, cut a 4" 10.2cm)
diameter hole through the floor and all other layers of flooring and
sheathing directly beneath the center of the water heater.
2. Insert the air intake into the 4" (10.2cm) diameter hole and fasten to
the floor with the screws provided.
3. Adjust the air intake so the lower tube is extends below the underside
sheathing and secure with the screws provided. THE BOTTOM OF THE
AIR INTAKE MUST BE AT LEAST 12" (30.5cm) ABOVE THE
GROUND LEVEL.
4. Seal the openings around the air intake and underside sheathing to
resist the entrance of rodents.
5. Position the water heater so it is centered above the air intake. (Note:
The water heater should also be centered with the openings in
the roof and ceiling to allow for correct assembly of the roof
jack to the draft diverter.)
The water heater is to be secured in place using the supplied sheet metal
strapping and screws. Fasten the base of the water heater to the floor using the
screws provided. The perforated metal strapping must be fastened to the top
of the water heater and to the adjacent walls with the screws provided
(See Figure 4).
WATER CONNECTIONS
NOTE:
BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE.
After shutting off the main water supply, open a faucet to relieve the water line
pressure to prevent any water from leaking out of the pipes while making the
water connections to the water heater. After the pressure has been relieved,
close the faucet. The COLD water inlet and HOT water outlet are identified on
the top of the water heater. The fittings at the cold water inlet and hot water
outlet are dielectric waterway fittings with 3/4" NPT male thread. Make the
proper plumbing connections between the water heater and the plumbing
system to the house. Install a shut-off valve in the cold water supply line.
WARNING
The vent system must be installed properly. Failure to properly
install the vent system could result in property damage, personal
injury, or death.
WARNING
Liquefied petroleum gases/propane gas are heavier than air and will remain at floor
level if there is a leak. Basements, crawl spaces, closets and areas below ground level
will serve as pockets for accumulation of leaking gas. Before lighting, smell all around
the appliance area for gas. Be sure to smell next to the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any telephone
in your building.
• Immediately call your gas supplier from a neighbor’s
telephone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS CORRECTED!
IMPORTANT
The flow of combustion and ventilating air must not be obstructed.
Figure 1
Minimum Clearances From
Combustible Materials
A 0” (0cm) Left, 2” (5.08cm) Right
(113.6 Liters only)
B 0” (0cm)
C 4” (10.16cm)
D 78” (1.98m) min
VENT ----
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED ¾” X ¾”
TEMPERATUARE AND PRESSURE RELIEF VALVE WILL RELEASE THE
MANUFACTURER FROM ANY CLAIM WHICH MIGHT RESULT FROM
EXCESSIVE TEMPERATURE AND PRESSURES.
CAUTION
If sweat fittings are to be use, DO NOT apply heat to the nipples on top of the
water heater. Sweat the tubing to the adapter before fitting the adapter to
the water connections. It is imperative that heat is not applied to the nipples
containing a plastic liner.