Water Heater (CONT) - TM-3-4230-209-20-P0029

the fuel and ignition drive motor to be powered. Also, the jumper wire from

(9) After approximately 2 seconds the heat from the TD-1 heater

terminal 1 to 5 and out of terminal 6 have power. At terminal 6 there are two

closes the bimetallic contacts on TD-1. As we have indicated before, voltage

branch circuits. The first branch circuit is routed through the fuel pump

has been applied to pin 5 of TD-1 and could not be used because of the open

solenoid valve (L1) which closes routing fuel to the combustor. The second

contact. (Now that the contact closes, the voltage is routed to relay K-2

branch leaves S4 terminal 6 and goes to relay K-2 solenoid (X1-X2) to ground

terminal A1 (K2 deenergized). From A-1 voltage is routed through combustor

and K2 closes. This K-2 closing places a voltage at A2 and also at A1 plus

air pressure switch (S3), thermal delay relay T-D-2 contacts 5 and 7. It continues

through the relay contacts. At this time there should be an indication of fuel

on through the contacts of the temperature limit switch (S1) and back to switch

being ignited in the combustor.

S-4 at terminal 1. As before, voltage from S4-1 closes K-1 solenoid and allows

TM 3-4230-209-20&P

1-19