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Teledyne Laars Hi-E EPH 300 Manual

Pool and spa heater
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Page 1
SECTION 1.
General Information
This manual provides maintenance instructions for the
Teledyne Laars Hi-E Model EPH 300 pool and spa heater.
SECTION 2.
Overall Operation and Service
2A. Heater Control Components
Some of the heater control components are the same
as those used in conventional heaters, but others are
designed specifically for the Hi-E EPH 300 heater (see
Fig. 1).
The following paragraphs describe the special
controls and their operation.
2A-1. Pressure Switch
The pressure switch is a safety device that senses
water pressure or back pressure between the heater and
the pool or spa when the filter pump is operating. The
switch is factory set at 2 pounds per square inch (psi)
(14 kilopascals [kPa]).
When the switch senses adequate water pressure, it
closes, allowing the heater to fire. The switch opens any
time water pressure is below 2 psi (14 kPa) and remains
opens, preventing the heater from firing, regardless of
the temperature control setting. If the water pressure is
Figure 1. Component Location
Hi-E Model EPH Pool and Spa Heater
too high, the switch remains closed, allowing the
heater to fire even if the filter pump is off. Therefore,
the height difference between the heater and the pool or
spa water surface level must fall within the correct
range.
2A-2. High Limit Switches
The Hi-E heater has two disk-type high limit
switches to meet ANSI safety requirements. The high
limit switches open if the temperature of the water
exceeds the respective limits, shutting down the heater.
The high limit switches close and automatically reset
when exposed to cool water flow for a short time.
The 150 degrees Fahrenheit (°F) (66 degrees
Celsius [°C]) high limit switch senses the temperature
of the hottest water as it leaves the heat exchanger.
The 135°F (57°C) high limit switch senses the tem-
perature of the mixed water after it leaves the heater
and mixes with water that bypasses the heater inlet to
the outlet.
Water can overheat if the water flow rate drops,
usually due to a flow restriction in the heat exchanger,
pool piping system, or a dirty filter. A broken disc or
spring in the automatic flow control valve can cause
the 150°F (66°C) high limit switch to open, allowing
too much water to bypass the heat exchanger, corre-
spondingly lowering the water flow rate through the
heat exchanger.

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Summary of Contents for Teledyne Laars Hi-E EPH 300

  • Page 1 This manual provides maintenance instructions for the spa water surface level must fall within the correct Teledyne Laars Hi-E Model EPH 300 pool and spa heater. range. SECTION 2. 2A-2. High Limit Switches...

  • Page 2: Periodic Inspection

    WATER BELOW System TEMP, HEAT ON, and FAN ON. These lights indi- The fuel/air mixing system in the Hi-E EPH 300 cate the operating status of the heater. heater makes sure the fuel/air ratio remains the same under a wide range of flow conditions (see Fig.
  • Page 3 Page 3 Hi-E Model EPH Pool and Spa Heater Figure 2. Venturi/Negative Pressure Regulator System 2E. Temperature Rise Test Procedure filters, and strainers, water valves, gas supply, electri- cal power and time clocks, have an effect on heater A temperature rise test confirms proper water flow through the heater.
  • Page 4 Page 4 If the temperature rise is outside the range indi- cated, two possibilities arise: 1. Case 1: The temperature rise value is less than 18°F (10°C). 2. Case 2: The temperature rise value is greater than 22°F (12.2°C). 2E-1. Temperature Rise Test Case 1 There are two conditions that can produce a temperature rise value less than 18°F (10°C): The supply gas pressure is too low or the system's water...

  • Page 5: Troubleshooting

    Page 5 Hi-E Model EPH Pool and Spa Heater Notes: 1. When using metal pipe as heat sink, join metal and PVC/CPVC, using metal male and PVC/CPVC female connection. 2. A manual bypass valve is used only when filtration rate normally exceeds 125 GPM (474 LPM). Figure 5.
  • Page 6 Page 6 NOTE: Gas supply test, stack test, and air flow filter 5. The pressure at the gas valve outlet will be 0.2 test should be completed before attempting this test or inch (5.08 mm) water column (W.C.) less than the making any adjustments.
  • Page 7 Page 7 Hi-E Model EPH Pool and Spa Heater 3. A minimum of 5 inches (127 mm) W.C. for To check the venturi pressure difference perform natural gas and 11 inches (279 mm) W.C. for the following stack test: propane gas, when the burner is firing, is required. 1.

  • Page 8: Electrical Troubleshooting

    3B. Electrical Troubleshooting m) below the water surface. Instead, contact your This section describes procedures for checking the Teledyne Laars representative for instructions. electrical power and control components of the heater (see Fig. 7 for a typical example of a wiring diagram).
  • Page 9 Page 9 Hi-E Model EPH Pool and Spa Heater LEGEND P - PURPLE BL - BLUE BK - BLACK O - ORANGE W - WHITE G-Y - GREEN W/ YELLOW TRACER BR - BROWN W-BK - WHITE W/ BLACK TRACER FACTORY WIRED 115V Y - YELLOW W-R - WHITE W/ RED TRACER...
  • Page 10 Page 10 1. Verify supply voltage at transformer primary. 24VAC at Transformer Secondary 2. Check circuit breakers. 3. Check transformer wiring. 4. Replace transformer. Check fuse. 24VAC at Pressure Switch Red Wire NOTE: Blown fuse is sign of short or overload. Do not bypass or jumper.
  • Page 11 Page 11 Hi-E Model EPH Pool and Spa Heater 1. Check fan operation 24VAC at TH Terminal on 2. Check air flow through vent. Ignition Control 3. Check venturi pressure switch. 4. Check wire between fan switch and ignition control. 120VAC at Igniter? Replace Ignition Control Is Igniter Glowing?
  • Page 12 13. Set the temperature control to the desired tempera- ture. 14. If a satisfactory adjustment cannot be made, contact a Teledyne Laars representative for assistance. 3B-4. Testing the Ignition Control Caution The ignition control and igniter operate on 120V power.

  • Page 13: Maintenance

    4A. Replacing the Combustion Air Filter Perform a temperature rise test (see Section 2E) to The Hi-E EPH 300 heater uses a high efficiency confirm proper operation of the flow control valve. paper, fiber matrix filter covered with a foam sleeve.

  • Page 14: Combustion Air Fan

    Page 14 Figure 12. Filter Removal Figure 13. Flow Control Valve 5. Disconnect the brown and yellow wires from the 4C. Removing the Venturi Assembly and gas valve. Combustion Air Fan 6. Separate the four-wire connector located near the 1. Turn off the electrical power and gas supply combustion air fan (see Fig.
  • Page 15 Page 15 Hi-E Model EPH Pool and Spa Heater Figure 15. Upper and Lower Front Panel Removal Figure 14. Removing the 4-Wire Fan Connector 4D. Replacing the Burner, Heat and the four screws on the sides (see Fig. 15). Two Exchanger, and Condensate Pan of these screws are inside the heater compartment.

  • Page 16: General Information

    Siphon Loop, Water Press. Sw....R0208300 To order or purchase parts for the Teledyne Laars Flange Assembly ........R0055000 Hi-E EPH 300 pool and spa heater, contact your nearest Bolt/Washer Set, Flange ......R0211200 Flange, 2 Inches ........10573500 Teledyne Laars dealer or distributor.
  • Page 17 Page 17 Hi-E Model EPH Pool and Spa Heater...
  • Page 18 Page 18 TELEDYNE LAARS HI-E LIMITED WARRANTY Your Teledyne Laars Hi-E Model EPH 300 pool and spa heater is backed by this double warranty to assure your complete satisfaction. 1. Controls, copper heat exchanger tubes, combustion fan, burner, and firebox panels are warranted against defects in materials and workmanship for two (2) years from date of purchase.

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