Filling The Water Heater; Venting - Lochinvar COMMERCIAL GAS WATER HEATERS Instruction Manual

FIGURE 11.

FILLING THE WATER HEATER

Never use this water heater unless it is completely full of water.
To prevent damage to the tank, the tank must be fi lled with water.
Water must fl ow from the hot water faucet before turning "ON" gas
to the water heater.
To fi ll the water heater with water:
1. Close the water heater drain valve by turning the handle to the
right (clockwise). The drain valve is on the lower front of the water
heater.
2. Open the cold water supply valve to the water heater.
NOTE: The cold water supply valve must be left open when
the water heater is in use.
3. To insure complete fi lling of the tank, allow air to exit by opening the
nearest hot water faucet. Allow water to run until a constant fl ow is
obtained. This will let air out of the water heater and the piping.
4. Check all water piping and connections for leaks. Repair as needed.

VENTING

VENT DAMPERS - Any vent damper, whether it is operated thermally
or otherwise must be removed if its use inhibits proper drafting of
the water heater.
Thermally Operated Vent Dampers: Gas-fi red water heaters having
thermal effi ciency in excess of 80% may produce a relatively low fl ue
gas temperature. Such temperatures may not be high enough to
properly open thermally operated vent dampers. This would cause
spillage of the fl ue gases and may cause carbon monoxide poisoning.
Vent dampers must bear evidence of certifi cation as complying with
the current edition of the American National Standard ANSI Z21.68
(ANSI Z21.66 & 67, respectively, cover electrically and mechanically
actuated vent dampers). Before installation of any vent damper,
consult the local gas utility for further information.
For replacement heater installations where using pre-existing venting,
venting must be inspected for obstructions and if deterioration is
present venting must be replaced.
To insure proper venting of this gas-fi red water heater, the correct
vent pipe diameter must be utilized. Any additions or deletions of
other gas appliances on a common vent with this water heater may
adversely affect the operation of the water heater. Consult your gas
supplier if any such changes are planned.
For proper venting in certain installations, a larger diameter vent pipe
may be necessary. Consult your gas supplier to aid you in determining
the proper venting for your water heater from the vent tables in the
current edition of the National Fuel Gas Code ANSI Z223.1/NFPA 54.
Periodically check the venting system for signs of obstruction or
deterioration and replace if needed.
The combustion and ventilation air fl ow must not be obstructed.
The water heater with draft hood installed must be connected to a
chimney or listed vent pipe system, which terminates to the outdoors.
Never operate the water heater unless it is vented to the outdoors
and has adequate air supply to avoid risks of improper operation,
explosion or asphyxiation.
For proper drafthood attachment, the drafthood legs may be angled
slightly inward.
Obstructed or deteriorated vent systems may present serious health
risk or asphyxiation.
The vent pipe from the water heater must be no less than the diameter
of the draft hood outlet on the water heater and must slope upward
at least 1/4 inch per linear foot (21 mm per meter), see Figure 12.
All vent gases must be completely vented to the outdoors of the
structure (dwelling). Install only the draft hood provided with the
new water heater and no other draft hood.
Vent pipes must be secured at each joint with sheet metal screws.
12
FIGURE 12.