Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual download pdf (Page 43)

Installation and Service Manual

Access to Internal Control Panel

The control panel is accessed by turning the knurled knob

located at the bottom center of the exterior control panel. Pull

the panel out at the bottom. The door will tilt into unit until it

comes free from the outer top. The outer control panel has an

overlay attached to the exterior surface which indicates the

function of each of the pool heater’s indicating lights and a

clear window to view the digital temperature display from the

temperature control. The thermostat and diagnostic light board

are mounted to the back of the control panel door.

The control panel assembly is mounted on a slide out chassis

to allow easy access to the components on the panel. The

control panel contains the ignition module, transformer for the

24 VAC control circuit, circuit breaker for the control circuit,

switching relays for component operation and wiring harness

connections to the pool heater’s components. The control

panels are common and may be switched between pool heaters

for trouble shooting.

Removing the Control Panel

1. Pull the control panel out as far as it will go.

2. Remove the multi-pin connector blocks from the top and

right side of the control panel.

3. Use a 1/2" box wrench or socket wrench to remove the bolt

on the right side of the control panel.

4. Remove the entire control panel.

5. Reinstall the control panel in the reverse order.

 CAUTION: Control panel is heavy and

awkward to handle when removed. Carefully

support the control panel when removing.

Ignition and Control Timings

Proven Pilot Hot Surface Ignition System F-9 on 500,000

through 2,070,000 Btu/hr models with One Hot Surface

Ignition Module.

Hot Surface Ignition Module Timings (Nominal)

Prepurge: 15 Seconds

Hot Surface Igniter Heat-up Time: 25 - 35 seconds

Main Burner Flame Establishing Period: 4 Seconds

Failure Response Time: 0.8 Seconds at less than 0.5 μA

flame current

Flame Current: 5 - 15 μA

Post-purge: 30 Seconds

Optional Pump Delay Timing: 30 Seconds after burner

shutdown

Code Sequence Condition

Constant ON System OK, no faults present.

Constant OFF Possible control fault, check power;

LED may be effective, do not

replace control if all operational

sequences function properly, see

TroubleShooting Guide.

One Flash Low Air, check air pressure switch and

hoses to pressure sensing points, fan,

venting and sealing of pressurized

chamber.

NOTE: Brief flashing normal on fan start-up/proving.

Two Flashes Flame without call for heat, check for a

gas valve stuck in the open position, air,

venting, burners and the combustion

process. Fan will remain on.

Three Flashes Lockout due to flame failure, push reset

button on outer control panel after

correcting ignition problem. Initial heater

start up without properly bleeding air

from the gas line may require multiple

reset functions to achieve proper ignition.

Four Flashes Igniter failure, igniter will not maintain

minimum 2.75 amp current draw, caused

by low voltage, bad wiring/continuity,

high resistance or igniter failure.

Five Flashes Power supply problem, check for low

supply voltage or transformer output less

than 18VAC.

Six Flashes Replace ignition module, internal fault.

TABLE-N

Ignition Control Diagnostic Codes

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 59 60

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Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual Page 43

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