Schematic to Pictorial Page A4 schematic to Page A4a pictorial

Schematic to Pictorial

Page A4 schematic

to

Page A4a pictorial

Take page A4 and A4a out of your ‘Student

Handout Packet’ and lay them side by side.

You will follow the schematic on page A4

and draw wires, using your pencil, on page

A4a to complete the circuit. Absolutely no

pens allowed.

Start on page A4 at the incoming power. Page A4

shows the black wire going to the transformer

primary wire and it will be the black wire on the

primary. So go to page A4a and draw a wire from

the fused disconnect to the transformer primary.

See next 2 slides for help and to check your work.

RW

Continue from this junction point at the transformer

and go to terminal 1 of the fan relay. See next 2

slides for help and to check your work.

RW

Continue from terminal 3 of the fan relay and go to

the motors ‘B’ wire. See next 2 slides for help and

to check your work.

RW

Now go back to terminal 2 of the fan relay and go

to the fan switch. You will notice that the fan

switch is marked ‘LINE’ and ‘LOAD.’ You will bring

power to the ‘LINE’ terminal. See next 2 slides for

help and to check your work.

RW

Continue by going out of the fan switch ‘LOAD’

terminal and go to the motors ‘R’ wire. See next 2

slides for help and to check your work.

RW

Continue by going from the motors ‘W’ wire and go

to the ‘W’ wire of the transformer. See next 2 slides

for help and to check your work.

RW

Continue by going from ‘W’ connection at the

transformer back to L2 at the disconnect. See

next 2 slides for help and to check your work.

RW

You have completed the line voltage (120v) circuit

for this schematic. Now move onto the low voltage

circuit.

Start at the low voltage side of the transformer

(secondary). You will notice that one terminal is

marked ‘P’ and the other terminal is marked ‘C.’

The ‘P’ terminal would be for power and the ‘C’

terminal would be for common.

RW

P C

Draw a wire, using your pencil, from the ‘P’

terminal of the secondary of the transformer to

terminal ‘4’ of the terminal strip. See next 2 slides

for help and to check your work.

RW

P C

Continue from terminal strip ‘4’ terminal and go to

terminal ‘R’ of the thermostat. See next 2 slides

for help and to check your work.

RW

P C

Continue from terminal ‘W’ of the thermostat to

terminal ‘W’ of the terminal strip. See next 2 slides

for help and to check your work.

RW

P C

Continue from terminal ‘W’ of the terminal strip to

the ‘LINE’ side of the LIMIT. See next 2 slides for

help and to check your work.

RW

P C

Continue from the ‘LOAD’ side of the LIMIT and

arrive at the Pilot Switch. You will notice that I am

coming into the right of the switch. Since this is a

series connection it would not matter which way I

go. And it will help to minimize confusion. See

next 2 slides for help and to check your work.

RW

P C

Continue from the Pilot Switch onto the gas valve.

See next 2 slides for help and to check your work.

RW

P C

Continue from the gas valve to terminal ‘X’ of the

terminal strip. See next 2 slides for help and to

check your work.

RW

P C

Finish the low voltage circuit by going from

terminal ‘X’ of the terminal strip to the ‘C’ terminal

on the transformer. See next 2 slides for help and

to check your work.

RW

P C

You have now finished taking a schematic and

used it to wire the pictorial. The same process

would be applied to wire an actual piece of

equipment if you had to. This process is also used

to trace the wire on a piece of equipment.

The End