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9.3.9 Iron Core Transformer Testing
Tools Required:
Flat-blade screwdriver, 120VAC capable Digital Multi-Meter (must have mA AC capability) and
alligator clips or a jumper wire.
Transformer Function:
Transforms 120 Volts into a low ampere, high voltage (10,000 V) supply to the electrode. This
provides the spark needed for combustion.
Note:
During this test, if the Transformer does not function as stated, call Technical Services
for assistance, or Customer Service to order a service part.
EnergyLogic does not recommend the use of a screwdriver or any other
conductor to contact the transformer springs other than the testing procedure below!
During a portion of this test, high voltage electrical components will be
energized. Only a certified electrician is to perform the following procedures, and with
extreme caution.
Procedure:
1.
Unplug the preheater. Close the hand valve on the preheater.
2.
Use the screwdriver to loosen the primary control mounting cover and lift to allow
access to terminal strip underneath.
3.
With the burner plugged in, jumper the T-T terminals to simulate a call for heat. When
the burner starts, jumper the F-F terminals on the primary control.
4.
Find the Black wires coming from the transformer and cautiously check the voltage
across the terminals. Should read between 105 and 120 volts AC.
a.
If reading is not within range, call your electrician to rectify voltage issue. There
may be an issue with your local power company.
5.
Remove jumpers from T-T and F-F terminals.
6.
Unplug the burner plug from its receptacle.
7.
Loosen or remove two ignition transformer screws.
8.
Tilt back the transformer.
9.
Verify that the springs are making contact with the electrode extensions by visually
aligning the springs with the extensions. If they are misaligned, reshape the springs to
ensure good contact. If soot is present, clean with wire brush or emery cloth.
10.
Use Caution when approaching the transformer springs! They will be energized
with step 11.
11.
Plug in the burner and replace the jumpers as in step 3. You will need to disconnect
one of the yellow, cad cell wires from the primary control for the burner to restart.
Using a digital multi-meter:
12.
Using your digital multi-meter
a. Without an amp clamp (must have mA AC capability)
i. Set the reading to amperes.
ii. Test amperes from spring to spring.
iii. Reading should be between 20mA and 26mA with a nominal of 23mA.
(transformer should be labeled)
