Rinnai FC510N User Manual page 21

TC1 & TC2 Milli-volt Readings
Procedure for measuring TC1 & TC2 Thermocouple Outputs
1. Set voltage meter to read at least 35 milli-volts. Insert meter leads into the output test port holes on the
rear of the unit, see below for proper test ports for each thermocouple.
FC510 (RCE-391A) Thermocouple Output
TC1 (mV) Brown & White
Gas Type High Fire
Propane Gas 23 - 26
Natural Gas 26 - 29
2. Fire the unit up and check the milli-volt output on each thermocouple per readings listed above. Readings
below those listed above will cause the unit to code out. Verify inlet/manifold high/low fire gas pressures
if your readings are not within the specifications as listed above.
TC2 (mV) Black & White
Wires Wires
Low Fire High Fire
16 - 20 23 - 31
17 - 21 18 - 26
TC1 test ports - Top is the brown
& bottom right is white wire.
TC2 test ports - Bottom left is the
black & bottom right is white wire.
FC824 (RCE-691TA) Thermocouple Output
TC1 (mV) Brown & White
Low Fire High Fire
16 - 24 23 - 26
15 - 23 26 - 29
TC1
TC2 (mV) Black & White
Wires Wires
Low Fire High Fire
16 - 20 23 - 31
17 - 21 18 - 26
Low Fire
16 - 24
15 - 23
TC2