PVI Industries PV500-24 User Manual

INSTALLATION & MAINTENANCE MANUAL FOR

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INSTANTANEOUS

ENERGY: WATER TO WATER

U-TUBE SINGLE-WALL & DOUBLE-WALL HEAT EXCHANGERS

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TYPICAL CONSTRUCTION

FIGURE 24-1

1. U-tube Heat Exchanger 9. Boiler Water Temperature Gauge *

2. Boiler Water Inlet 10. Tridicator *

3. Boiler Water Pump 11. Flow Switch *

4. Control Enclosure 12. Relief Valve (AGA optional)

5. Intratank Circulator 13. Tank Purge Valve *

6. Potable Water Inlet 14. Boiler Water Outlet

7. Potable Water Outlet 15. Check Valve

8. Tank Drain * Optional

CAUTION: TEMPERATURES HIGHER THAN 125°F. INCREASE THE RISK OF SCALD INJURY!

IMPORTANT: Clearances for servicing and inspection are 18” at top, sides and rear and a

minimum of one tank diameter in front.

PV500-24 03-99 Section 24 1

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WATER WITH SINGLE-WALL / DOUBLE-WALL

START-UP OPERATION

1. The boiler water circulating pump has
been selected to provide optimum flow
through the heat exchanger tubes to
meet demand with the available boiler
water. The pump is controlled by the
thermostat and draws from the
operating boiler water loop. When the
demand is satisfied, the pump stops,
causing the boiler water to bypass the

CAUTION: Temperatures higher than 125°F. increase the risk of scald injury.

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unit. In addition, the water heater maybe
equipped with a continuous operation
tank circulation pump. The boiler water
circulation pump is sized to satisfy all of
the head resistance of the heat
exchanger, therefore no pressure drop
need be considered for this unit in sizing
primary loop pumps.

START-UP PROCEDURE

1. Fill the tank with water; open the relief
valve or a nearby hot water outlet to
purge air from the top of tank. Check for
plumbing leaks.

2. Push the control switch to “on” position.
Check boiler water pump operation. The
tank circulating pump should also
operate. Check thermostats for proper
setting. The thermostats are labeled as
to their function. The temperature
limiting device is set at 200°F.

Temperature Setting: The thermostats
are set at the factory to 120°F on the
operating control. Upon startup, the

factory preset operating temperature is
visible on the LED indicator of the digital
controller. Adjust the temperature using
the appropriate up and down arrow keys
on the face of the controller. A slight
variance in temperature control may be
noticed as the digital control tunes,
allow time for the temperature to
stabilize.

3. Open nearby hot water tap to maintain a
flow of water through the tank when
starting up units. Regulate flow of water
through the tank to allow the boiler
water pump to cycle off and on, and
check operation of unit.

PV500-24 03-99 Section 24 2