Addison DC Series Manuel d'installation, d'utilisation et d'entretien - Page 17
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TROUBLE SHOOTING GUIDES CONTINUED
General Gas Furnace
See gas furnace Instruction Manual Included with gas furnace(s) for trouble shooting details.
TROUBLE SHOOTING GUIDES CONTINUED
Electronic-Regulator
SYMPTOM
POSSIBLE CAUSE
1. Faulty automatic control valve.
A. Automatic control valve will
2. Installation wiring error.
not close despite full range of
modulating voltage at terminals
3. Amplifier is faulty.
1 and 2.
1. Faulty automatic control valve.
2. Open wire to automatic valve.
B. Automatic control valve will
not open despite full range of
modulating voltage at terminals
3. Amplifier is faulty.
1 and 2.
1. Faulty power supply.
C. No gas flow.
2. MR valve installed backward.
1. Room Override Thermostat, if used,
calls for heat.
D. Continuous high fire.
2. Open circuit in sensing and setting
circuit.
1. Open circuit in wiring to MR valve.
E. Continuous high fire but
2. Plunger jammed or installed upside
automatic valve cycles.
down.
3. Faulty MR valve.
1. Short circuit in sensing and setting
F. Furnace won't activate due
circuit
to constant high modulating
voltage (above 17 VDC).
16
FIELD TEST
1. Remove wire from valve, if valve doesn't close —valve is faulty.
2. Remove wire from amplifier terminal 10 and 11. If valve remains open
check for miswiring.
3. If AC voltage will not drop to zero at terminals 8 and 11 when DC voltage at
terminals 1 and 2 is above 20 V DC, amplifier is faulty.
1. Read voltage across valve terminals. If 24 V AC, valve is faulty.
2. Read voltage across terminals 8 and 11 on amplifier. If 24V AC, check for
open circuit to automatic valve. If space temperature is less than 60° or
greater than 85°F.
3. If AC voltage reading remains zero when DC voltage at terminals 1 and 2 is
below 14V DC, amplifier is faulty. If space temperature is less than 60° or
greater than 85°F.
1. Read voltage at amplifier terminals 8 and 14 (24 V AC).
2. Arrow on MR valve should point in direction of gas flow.
1. Remove T115 wires from amplifier terminals 3 and 14.
2. Disconnect and measure across wires connected to amplifier between
terminals 3 and 4 (A1010). Should read between 8,000 and 12,000 ohms.
1. Check wiring for defects.
2. Plunger should be smooth and clean and operate freely in solenoid sleeve. 2. Clean or replace plunger.
3. Measure voltage across MR valve.
1. Disconnect and measure across wires connected to amplifier terminals 3
and 4 (A1010). Should read between 8,000 and 12,000 ohms.
REMEDY
1. Replace automatic control valve.
2. Correct wiring.
3. Replace amplifier.
1. Replace automatic control valve.
2. Correct wiring.
3. Replace amplifier.
1. Power supply must be 24V AC.
2. Install properly.
1. If proper operation is obtained, check thermostat
wiring for shorts. Rotate thermostat dial above and
below room temperature to prove thermostat
function.
2. If above 12,000 ohms check circuit for open or
loose wires.
1. Replace wiring if necessary.
1. If below 8,000 ohms check circuit for shorts or
miswiring.