Heating darkroom.

TM 11-6780-225-12

b. Starting Air Conditioner. Start air conditioner as

(1) Heating darkroom.

follows:

WARNING

Make certain that the fresh air intake

CAUTION

(para 2-5d) is open, the condensate

Before staring the air conditioners,

drain cap has been removed and the

make certain that the plastic covers

exhaust pipe installed (para 2-5g),

(fig. 5-1) have been removed.

and the cap has been removed from

(1) Check that air conditioners are properly

the fuel overflow drain port (para 2-

interconnected. Refer to figure 2-2.

5f).

(2) Set circuit breakers 1 and 2 to the ON

(a) Place

the

SUMMER-WINTER

positions.

damper control (fig. 1-1) to the WINTER position.

(3) Set thermostat on air conditioner No. 1 to

(b) Place

the

HEATER-OFF-FAN

the desired temperature range.

switch (fig. 2-8) in the HEATER position.

(4) Set the compartment air conditioning

thermostat (fig. 1-18) to the desired temperature range.

shall glow.

(5) Set the registers of air-conditioning ducts

(d) Set the DRIER-ROOM switch to

(fig. 1-16) to desired positions.

ROOM position and set the compartment heating

(6) First place the selector switch on each air

thermostat (fig. 1-18) to desired temperature.

conditioner to the FAN position to start the fans, then

(2) Heat to film and print drying cabinets only.

place each selector switch to the COOL position.

(a) Place

the

SUMMER-WINTER

c. Water System Valve Settings. Use the following

damper control (fig. 1-1) to SUMMER position.

procedures to supply water to the darkroom from a

(b) Set the drying cabinet heat control

water source under pressure ((1) below), a water source

to the open position (push in) and the DRIERROOM

from a lake or stream ((2) below), and from the

switch (fig. 2-8) to the DRIER position.

darkroom water tank ((3) below). Procedures for filling

the water tank by using snow as a water source is given

in ((4) below).

thermostats (fig.

1-1) as required to the desired

temperature (maximum operating temperature is 80°

CAUTION

(26.5° )).

Do not turn the water heater switch

to ON until the water heater -tank is

(d) Set the AUTO-OFF-MAN switch

full, as indicated by water flowing

(fig. 2-8) to the MAN or AUTO position as desired.

from valve S6 (fig. 1-17), Remove

(e) Place the HEATER-OFF-FAN switch

floor drain plug and install floor

to the HEATER position, the white heater indicator lamp

drain manifold. Check to see that

shall glow.

circuit breakers 6 and 10 (fig. 2-11)

(3) Circulate fresh air through darkroom.

are set to ON.

NOTE

(1) Water source under pressure (fig. 2-12).

necessary,

additional

air

(a) Close the valves given below (fig.

circulation may be obtained by

1-17).

performing (a) through ( e) below.

1. Drain valve D1

(a) Place

the

HEATER-OFF-FAN

switch to the FAN position.

2. Drain valve D2

(b) Set the SUMMER-WINTER damper

3. Drain valve D3

control to the WINTER position.

4. Drain valve D4

5. Drain valve D5

to the closed position (pull out).

6. Drain valve D6

(4) Fresh air to film and print drying cabinets.

7. Drain valve D7

(a) Place

the

HEATER-OFF-FAN

8. Drain valve D10

switch to the FAN position.

9. Drain valve D11

(b) Set the SUMMER-WINTER damper

10. Drain valve D12 (petcock)

control to the SUMMER position.

11. Drain valve D18

to the open position (push in).

Change 5

2-16