Teledyne Laars Hi-E EPH 300, Руководство пользователя, Страница: 11 / 18

Page 11
Hi-E Model EPH Pool and Spa Heater
1. Check fan operation
2. Check air flow through vent.
3. Check venturi pressure switch.
4. Check wire between fan switch and ignition control.
24VAC at TH Terminal on
Ignition Control
YES
Is Igniter Glowing?
Replace Ignition Control
YES
YES
24VAC at Ignition Control VAL
Terminal?
NO
NO
Check Igniter Resistance
NO
120VAC at Igniter?
Replace Igniter
NONE
Replace Ignition Control
NO
Is Burner Firing?
NO
1. Check supply gas and verify gas valves are open.
2. Verify 24V to gas valve (in none, check wires).
3. Replace gas valve.
YES
Figure 8. Troubleshooting Flowchart (Continued)
3. A filter pump with a bad motor or impeller
develops less pressure.
3B-3. Adjusting the Pressure Switch
When the heater is installed between 3 and 10 feet
(0.91 and 3.05 m) below the water surface of the pool
or spa, the pressure switch senses the increased weight
of the water, remains closed, and allows the heater to
fire when insufficient water is present. Adjust the
pressure switch as follows:
1. Turn heater to OFF position.
2. Disconnect wires to the pressure switch.
3. Clip leads of a voltmeter across the pressure
switch.
4. Set voltmeter to lowest resistance scale.
5. Use a 7/32 inch (5.55 mm) Allen wrench to adjust
the switch. Slowly turn the adjustment clockwise
(raising the setting) until the pump turns OFF (see
Fig. 10).
Figure 9. Optimum Elevation Between the Heater and
the Pool/SPA
2. A dirty or clogged pool filter or leaf trap may
restrict the water flow and cause pressure loss.
The dirtier the filter or trap, the greater the loss.