Bradford-White Corp TG-180E-N(X) Manual De Usuario

38 

 

 Thermal Fuse / Overheat Switch. 

Red-Red 

11-13 VDC 

Below 1 ohms 

F6 

H1 

F6-

H12 

 
 
Flame Rod: 
Place one lead of your meter to the flame rod and the other to ground.  With the unit running, you should 
read between 5-150 VAC.  Set your meter to µ amp scale and series your meter in line with the flame rod.  
You should read 1 µ amp or greater for proper flame circuit.  In the event of low flame circuit, remove the 
flame rod and check for carbon or damage. 
 
Heat Exchanger and Outgoing Water Temperature Thermistors: 
Check all Thermistors by inserting meter leads into each end of the thermistor plug.  Set your meter to the 
20k scale and read resistance.  Applying heat to the thermistor bulb should decrease the resistance.  
Applying ice to the thermistor bulb should increase the resistance.  See below for examples of typical 
temperatures and resistance readings. 
 

Example: 

59ºF = 11.4-14kΩ 140ºF 

= 

2.2-2.7kΩ 

86ºF = 6.4-7.8kΩ 221ºF 

= 

0.6-0.8kΩ 

113º = 3.6-4.5kΩ 
 

 Outgoing Water Thermistor. 

White-White n/a 

See example 

above 

F5 3-4 

 

 Heat Exchanger Temperature Thermistor. 

Pink-White n/a 

See example 

above 

F4 3-11 

 

 Intake Air Thermistor (Indoor Model Only). 

Orange-White n/a 

See example 

above 

F3 3-12 

 

 Surge Protector. 

Black-White 108-132 

VAC 

n/a 

D2 

1-3 

Blue-Brown 108-132 

VAC 

n/a 

D1 

1-3 

 
 
With the power off, you can check the continuity through the surge protector.  Place a meter lead on the 
top pin #1 of the surge protector and pin #3 on the bottom of the surge protector.  Check across the top 
pin #3 and the bottom pin #1.  If you read continuity across these two points, the surge protector is good.  
If you do not get continuity, replace the surge protector. 
 

 Remote Controls. 

Terminals B1 

10-13 VDC 

1.5-3.0k ohms 

B 

1-3