10 G
G670 Intermittent Pilot Ignition Controls Technical Bulletin
The thermostat anticipator setting is normally equal to the ignition system
current draw, plus that of the pilot and main valve.
Due to variations in appliance wiring and valves, it is advisable to measure
the actual current draw of the heating system at the thermostat location.
Measuring this current can be accomplished by opening the thermostat
contacts (lowering the set point) and installing an AC ammeter across the
terminals, or by using a clamp-on ammeter with a 10-turn multiplier
attached to the terminals (see Figure 10).
IMPORTANT:
Measuring the current with an ammeter will energize
the system. Wait until the gas valve and inducer
energize before taking a current draw measurement.
Ten Turns
W
R
W
R
AC Ammeter Low Scale Setting
Clamp-on Ammeter
(Divide reading by ten.)
To
Heating
System
To
Heating
System
Figure 10: Measuring the Thermostat Current
Thermostat
Heat
Anticipator
Settings
