Troubleshooting guide

PV500-17 07/13 Section 17
5
MAXIM
START-UP PROCEDURES (con't)
CAUTION!
Conduct the following gas train leakage test before start-up, at annual intervals and
prior to investigating the cause of any reported occurrences of delayed ignition.
1. Using an appropriate bubble detection
solution, thoroughly coat all gas train pipe
connections. If any bubbles are detected, the
leaking connection must be tightened,
recoated and rechecked to assure stoppage
of the leak.
2. Attach a manometer, to measure gas
pressure, at the manual gas shutoff valve
located just upstream of the gas train. Adjust
gas train inlet pressure to the specified value
(e.g. 14 in. W.C.), and tightly close the gas
train manual shutoff valve closest to burner.
3. Reattach the manometer to the gas train
manual shutoff valve at the burner and record
the measured gas pressure in inches of water
column (in W.C.). Measure gas pressure
again after 15 minutes. If gas pressure has
increased 0.5" W.C. or more, the gas leak
must be isolated to one or more of the
operating gas valves, for example, a solenoid
actuated gas shutoff valve. After any leaking
valve is replaced, the reassembled gas train
must be leak tested again before start-up is
attempted. (NOTE: All gas valves removed
because of suspected leakage must be
returned to PVI Customer Service for
disposition.)
ELECTRICAL
1. Wiring to the unit should conform to the
National Electrical Code or the code legally
authorized in your locality. A fused disconnect
switch should be used for water heater
control. Service wiring connections of 120V, 1
phase, 60 Hz. are located in the enclosure on
the water heater.
IMPORTANT
Use only copper wire of proper sizing for
incoming service. Damage resulting from
use of aluminum wiring will be excluded
from coverage under the warranty of this
unit.
MAINTENANCE AND SAFETY INSPECTIONS
1. Establish a preventive maintenance program
to assure a longer water heater life.
2. The tank should be flushed at two- or three-
month intervals depending on water conditions
in your location. To flush, turn off electrical
disconnect switch to prevent the burner from
operating. Open drain valve and allow water to
flow through the tank until it runs clear. Close
the drain valve and turn the electrical switch
back on. Draining two or three gallons from the
bottom of the tank on a weekly basis will also
help prevent the accumulation of sediment.
Water impurities consist of fine particles of soil
or sand that will settle out and form a layer of
sediment on the bottom of the tank.
3. A scale of lime will normally form during
operation and will accumulate on the bottom of
the tank. Lime is formed from the natural
chemicals in the water that precipitate out
during heating cycles. Some water supplies
contain more of these chemicals than others
and scale buildup will occur more rapidly.
Other factors affecting scale buildup are the
amount of hot water used and temperature of
the water. The more hot water used, the more
fresh water containing scale-forming chemicals
is brought into the tank. As the temperature of
water increases, the rate of scale deposition
will be increased.