ORGANIZATIONAL TROUBLESHOOTING - Continued
HUPP MF510B, MF510C, MF60A-24V, MF60B-24V - Continued
TEST OR INSPECTION
4. FLOODED HEATER - Continued
Remove guard (page 2-32).
Disconnect fuel regulator valve (1) lead 7 (4) from terminal 7 of terminal strip (2).
Start heater for 4 minutes maximum (page 2-60).
If heater starts, let it run until fuel inside is burned up and heater shuts itself
Reconnect fuel regulator valve (1) lead 7 (4) to terminal strip (2).
Install guard (page 2-32).
if heater did not start, go to malfunction 1, step 5.
5. SHORT IGNITOR LIFE
Step 1. Remove guard (page 2-32).
Step 2. Adjust flame detector switch (page 2-34).
Make sure multimeter Is set for dc voltage function before performing step 3 to
avoid damage to equipment.
Step 3. Measure voltage across igniter (3) by placing multimeter leads across igniter relay
(5)/power control output terminal (6) and ground.
If voltage is more than 25 volts (or more than 18 volts for MF510C,
MF60A-24V, and MF60B-24V), remove heater and send to Direct Support
Maintenance for igniter relay/power control replacement.
Step 4. Install guard (page 2-32).
6. HEATER SHUTS OFF PREMATURELY
This malfunction only applies when air inlet temperature is 60°F(16°C) or above.