Heating and Air-Conditioning System

TM 11-6780-225-12

Control

Function

j. Electrical Power System (fig. 2-11).

Thermostat (at top of each

Regulates

temperature

Control

Function

inside

Circuit breaker No. 1............ Controls power to air condi-

cabinet) (fig. 1-1).

cabinet.

tioner No. 1.

Thermostat (in film drier

Regulates temperature of

Circuit breaker No. 2............ Controls power to air condi-

compartment).

space heater.

tioner No. 2.

Circuit breaker No. 3............ Controls power to circuit 3

(dehumidifier humidi

h. Heating and Air-Conditioning System

stat control).

Circuit breaker No. 4............ Controls power to circuit No.

Control

Function

4 outlets (refrigerator,

Air conditioner No. 2

Controls temperature of air

immersion heater, and

thermostat (fig. 1-18).

conditioner No. 2.

intercom and exhaust fan

Registers (fig. 1-16)

Controls flow of air to dark-

switches).

room compartments.

Circuit breaker No. 5............ Controls power to water

Position

Operation

heater switch.

SUMMER-WINTER damper

SUMMER ... Directs flow

Circuit breaker No. 6............ Controls power to circuit No.

control (fig. 1-1).

of air from

6 general purpose outlets

space heat-

(safelight switches).

er to film

Circuit breaker No. 7............ Controls power to circuit No.

and print

7 (space heater and film

drying

and print driers).

cabinets.

Circuit breaker No. 8............ Controls power to circuit No.

WINTER..... Directs flow

8 outlets (repeating timer,

of air from

enlarger, print processor

space

switch)

heater

(TM 11-6740-285-12).

to dark-

Circuit breaker No. 9............ Controls power to control

room

unit switch (TM 11-

heating

6740-286-12).

ductwork.

Circuit breaker No. 10.......... Controls power to water

pump switch.

i. Repeating Timer (fig. 2-5).

Circuit breaker No. 11.......... Controls power to compart-

ment light switches.

Control

Function

Circuit breaker No. 12.......... Spare circuit breaker for ad-

Position

Operation

ditional circuits.

Audible slide lock

Shuts off au-

Exhaust fan switches

Controls exhaust fans.

dible sec-

(fig. 1-18).

ond count

Indcandescent light switches Controls

incandescent

DOWN

Operates au-

lights.

dible sec-

(fig. 1-18).

ond count

MAIN CIRCUIT

Controls all power to dark-

Dial knob

Sets time.

BREAKER NO. 13.

room.

Position

Operation

Safelight switches (fig. 1-18) Controls safelights.

PRINT-FOCUS switch

FOCUS

Bypasses tim-

er and

k. Water Supply System (fig. 1-17).

turns

off safe-

Control

Function

light to

Position

Operation

focus en-

Drain valve D1 ..................

Open .......... Allows waste

larger.

water to be

Operates safe-

expelled

light and

through

enlarger

the outside

through

drain con-

timer.

nection.

START switch

Starts timer.

Closed ........ Diverts water

from sink.

2-10