PVI Industries U-TUBE SINGLE-WALL PV500-34 - Manual (Page 5)

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PV500-34 04/03 5 Section 34
STEAM WITH SINGLE-WALL / DOUBLE-WALL (con't)
START-UP PROCEDURE
1. Fill tank with water; open relief valve to
purge air from top of tank. Check for
plumbing leaks.
2. Push control switch, located on the control
box, to activate the steam valve and
thermostats. Check steam valve for
operation; the valve solenoid should “click”
to open valves when operating switch is
pushed “on”. The tank circulating pump, if
present, should also operate. Check
thermostat settings. The temperature
limiting device is set at 200
°
F. Temperature
setting: The operating thermostat is set at
the factory at approximately 130°F and the
upper operating thermostat is set at
approximately 125°F. Adjustment may be
made by turning the operating thermostat
dial to the desired temperature.
3. Push the operating switch, located on the
control box, to “off” before opening manual
main steam supply valve. This will allow
condensate that has collected in the supply
line to drain through the trap installed in
front of the steam valve. When the steam
supply line is free of condensate, push
operating switch to “on”, opening the electric
on-off steam valves allowing steam to flow
through the heat exchanger.
4. Open nearby hot water tap to maintain a
flow of water through tank when starting up
units. Observe condensate flow at the
receiver or other collection site to verify
satisfactory flow. Regulate flow of water
through tank to allow steam valve to cycle
off and on, and check operation of unit.
MAINTENANCE
1. A preventive maintenance program should
be established to assure a long, trouble-free
life for the water heater.
2. Scale will normally form in the tank during
operation and will accumulate on the bottom
of the tank. The scale is formed from the
natural chemicals in the water that
precipitate out during the heating cycles.
Some water supplies contain more of these
chemicals than others, and the scale
buildup will occur more rapidly. Other
factors affecting the scale buildup are the
amount of hot water used and the
temperature of the water. The more hot
water used, the more fresh water containing
the scale-forming chemicals is brought into
the tank. As the temperature of the water
increases, the rate of scale deposited will be
increased. The unit should be inspected and
cleaned as required by local water
conditions.
CAUTION
The relief valve is a primary safety device.
3. It is required for safe practice to operate the
temperature and pressure relief valve once
a year by lifting the lever briefly. If the valve
does not open and close properly when
testing, it must be replaced.
4. The temperature limiting device and
thermostat temperature sensors that extend
into the water in the tank may become
coated with scale, depending on the type of
water in your area. This coating will affect
accuracy of sensors and can allow water
temperature to exceed the desired limits.
These controls should be removed from
tank and inspected at necessary intervals.
Remove scale if present.
WARNING!
To reduce the risk of electrical shock injury
or death, on control systems using 120 volt
external power, be certain switch is off and
power disconnected before work is
performed on this heater.