Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 43)

Installation and Service Manual
43
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.
ƽ
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