Table 19 Reheat Troubleshooting - Emerson Liebert Challenger 3000 Operation & Maintenance Manual

Table 18 Steam generating humidifier troubleshooting (continued)
Symptom
Excessive arcing in the
canister
On cold startup, canister
fills, high water alarm
activates and humidifier
fails to reach full amperage
On cold startup, canister
fills, high water alarm
activates and humidifier
fails to reach full amperage
Table 19 Reheat troubleshooting
Symptom
Reheat will not operate;
contactor not pulling in
Reheat not operating;
contactor pulling in
NOTE:
Reheat element sheaths and fins are manufactured with stainless steel. Regular inspections
are necessary to ensure proper cleanliness of the reheating element. Should inspection reveal
corrosion particles on the reheating element or adjoining surfaces (including ducts and
plenums), appropriate cleaning should be performed. Periodic reheating element replacement
may be required to meet specific application requirements.
Possible Cause
Drain valve clogged or
defective
Improper water supply
Insufficient drain rate
Excessive iron content in
water
Conductivity of water too low
Fill solenoid not closing tightly
Possible Cause
Control not calling for heat
Reheat safety stat open
Heater burned out
Verify that drain valve operates freely when activated. Clean
valve and replace coil or valve if defective. Flush canister
several times and replace if arcing persists.
If water is commercially softened, reconnect humidifier to
raw water supply, drain canister, and restart If connected to
hot supply, reconnect to cold water.
Increase drain rate by adjusting % pot on circuit board
above the preset 70% to roughly 80%.
Analyze iron content of water. If it exceeds 0.1 mg./l, install
a filter to remove iron from water supply.
Drain canister and add one Alka-Seltzer tablet to canister.
Refill. Turn the % pot to roughly 60%. Restart humidifier. If
amperage rises rapidly, it may be necessary to dilute the
water to prevent blown fuses. If it rises too slowly, add
another Alka-Seltzer tablet.
If humidifier returns to canister full condition, verity that the
fill solenoid closes tightly.
Check or Remedy
Check monitor status.
Jumper between terminals P34-1 and P34-2. If reheat operates,
safety is open. Remove jumper. Replace safety.
Turn Off power and check heater continuity with Ohm meter.
61
Troubleshooting
Check or Remedy