Jandy Legacy LRZM Installation And Operation Manual page 32

Page 32
Legacy
# Symptom
1. Pump not operat- A.
ing B.
C.
2. Pilot outage A.
B.
C.
D.
E.
F.
3. Flame roll-out at A.
start-up B.
C.
D.
E.
F.
4. Spillage at draft A.
hood B.
C.
D.
E.
5. Lazy fl ame with A.
yellow tip
6. Not enough heat A.
B.
C.
D.
7. Heater pounding A.
or knocking
8. Heater condens- A.
ing
9. Pressure relief A.
valve opens
10. Pilot is lit but main A.
burners will not
B.
come on
C.
D.
E.
F.
G.
11. Heater short A.
cycles
B.
Model LRZM Pool/Spa Heater Installation and Operation Manual
™
Table 8. Legacy Troubleshooting Guide
Cause
No power
Pump defective
Incorrectly wired
Inlet gas pressure too low
Inlet gas pressure too high causing
an unstable blowing pilot
Weak or defective thermocouple
Damaged pilot or thermocouple
Dirty pilot
Plugged or undersized pilot orifi ce
Blocked fl ue
Pilot out of position (delayed ignition)
Blocked heat exchanger
Refractory tile out of place
Altered vent cap
Low gas pressure
Cold chimney
Vent pipe pitches down to chimney
Blocked chimney
Altered draft hood
Prefabricated chimney with incorrect cap
Low primary air / low gas pressure
Inadequate gas supply
Low manifold gas pressure
Heater size inadequate
Low temperature rise
Inadequate water fl ow through heater
Low water temperature
Restriction in water fl ow system at or
downstream of heater
Gas valve not at "on" position
Hi-limit switches failed
Pressure switch failed or out of
adjustment
Fusible link failed
Gas valve failed
Broken wire in thermostat circuit or
defective thermostat
Heater wired incorrectly
Low water fl ow through heater
Failing hi-limit switch
Remedy
A. Check circuit breakers and power source.
B. Replace.
C. Recheck wiring.
A. Consult gas utility company. Inlet gas pressure to
heater should be 5.5" to 10.0" water column on natural
gas. 10.0" to 14.0" on propane gas.
B. Pressure should be regulated within limits shown above.
C. Replace thermocouple.
D. Replace.
E. Blow dust or lint out of pilot.
F. Clean or replace pilot orifi ce.
A. Remove blockage.
B. Correct pilot position.
C. Clean and correct as necessary.
D. Clean and correct tile as necessary.
E. Install factory provide vent cap.
F. Check and correct gas pressure.
A. Allow heater to operate fi ve (5) minutes to create draft action.
B. Reinstall vent pipe to pitch up from the heater to chimney.
C. Remove blockage.
D. Install factory-provided draft hood.
E. Install U.L. listed vent cap.
A. Correct manifold pressure according to rating plate.
Correct orifi ce size if necessary (see parts list). Clean
burner ports if dirty.
A. Gas meter too small. Gas line from meter to heater too small.
B. Gas pressure on heater manifold, should be adjusted
to 4.0" W.C. (natural gas), 9.0" W.C. (propane gas).
C. Replace with heater of higher input.
D. Check and correct water fl ow.
A. Check temperature rise between inlet and outlet heater
piping. See section 7.6 for recommended range of
temperature rise. If temperature rise is above the maximum
recommended, check for closed valve in system.
A. Flue product moisture will condense at the start-up until the
heater water temperature reaches the normal operating
conditions.
A. Check for proper operation of all valves, bypass valve and
any equipment between pool and heater outlet.
A. Turn knob to "on" position.
B. Investigate reason for overheating and replace hi-limit switch
as necessary.
C. Adjust pressure switch (see Section 7.5) or replace as
necessary.
D. Investigate reason for fl ame rollout and replace fusible link as
necessary.
E. Check and replace gas valve as necessary.
F. Check continuity through thermostat circuit with wires
disconnected.
G. Check heater wiring against wiring diagram in Section 6,
correct as necessary.
A. Increase size of pump or increase piping size.
B. Check hi-limit switches and replace as necessary.