Compensation pipe connection
Fig. 60
Maximum pressure adjustment screw
Minimum pressure adjustment screw
FAULT FINDING
Before attempting any faultfinding, the electrical checks must be carried out. Isolate the appliance from the electrical supply. Disconnect any external controls from terminal plug (Fig. 35), and insert a jumper between the two wires at the room thermostat connections (Fig. 35 ref. M4a).
NOTICE: Restore the electrical supply to the boiler and turn the main selector switch to the heating request position .The boiler should now function. Should the boiler fail to respond, the internal fuses and connectors should be checked to ensure integrity and continuity.
14. COMPONENT VALUES & CHARACTERISTICS
NOTE: The gas valve sticker “WARNING: VALVE IS NOT FIELD SERVICEABLE” means the valve can be adjusted but not disassembled.
13. ELECTRICAL CHECKS
Any electrical checks must be carried out by a ServiceTechnician Qualified.
GROUND CONTINUITY TEST
Isolate the boiler from the electrical supply, and using a suitable
SHORT CIRCUIT CHECK
Isolate the boiler from the electrical supply, and using a suitable
NOTICE: Should it be found that the fuse has failed but no fault is indicated, a detailed continuity check will be required to trace the fault. A visual inspection of components may also assist in locating the fault.
POLARITY CHECK
With the boiler connected to the electrical supply and using a suitable multimeter, carry out the following voltage tests:
-Connect test leads between the Live & Neutral connections at the boiler terminal strip (Fig. 35). The meter should read approximately 120VAC. If so proceed to next stage.
-Connect test leads between the Live & Ground connections at the boiler terminal strip (Fig. 35). The meter should read approximately 120VAC. If so proceed to next stage.
-Connect test leads between the Neutral & Ground connections at the boiler terminal strip (Fig. 35). The meter should read less than 1 VAC. If so polarity is correct.
REVERSED POLARITY OR SUPPLY FAULT
Repeat the above tests at the appliance isolator, if testing reveals correct polarity and/or supply at the isolator,
RESISTANCE TO GROUND CHECK
Isolate the boiler from the electrical supply, and using a suitable
These series of checks must be carried out before attempting any troubleshooting procedures on the appliance. On completion of any task that required the disconnection and
COMPONENT | VALUE |
Fan | 120VAC |
Pump | 120VAC |
120VAC | |
Ignition transformer | 120VAC |
Gas valve | 120VAC |
Room thermostat connection | 24 Vdc |
NTC sensor (dry contact) | 10Kohm |
NTC sensor (wet contact) | 10Kohm |
FUNCTION | VALUE |
Standard Heating Range °F (°C) | |
Floor Heating Range °F (°C) | |
CH limited power at 75% | 15 Min |
Heating OFF hysteresis °F (°C) | SP+8 (+5) |
Heating ON hysteresis °F (°C) | |
Pump | |
Low output (min. output + %) | Min+25 |
CO function max temp. °F (°C) | 203 (95) |
CO | 167 (75) |
CO function time | |
Flow NTC max temp. °F (°C) | 203 (95) |
High limit thermostat °F (°C) | 221 (105) |
Maximum differential °F (°C) | 95 (35) |
IGNITION CONTROL | VALUE |
Ignition attempts before L/O (lockout). | 5 |
| |
signal | 5 |
15. BOILER CONFIGURATION
The electronic board contains a series of jumpers that can be used to configure the boiler; access these by loosening the fasteners B and removing the control panel cover A after turning off the main switch (Fig. 62).
Locate the JP positioning (Fig. 63).
JUMPER IN POSITION 1 (Fig. 61):
The position nr. 1 of the jumper indicates the boiler heating tem- perature;
Jumper not inserted (factory set) - case 1 Standard system (radiators)
Jumper inserted - case 2
Floor system (radiant heating)
NOTICE: The boiler has been
JUMPER IN POSITION 2:
Jumper inserted:
heating + indirect water tank with sensor
JUMPER IN POSITION 3:
Jumper inserted:
heating + indirect water tank with thermostat - factory set
JUMPER IN POSITION 4:
unused
48