Figure 2-14. Valves used for water source from darkroom water tank

TM 11-6780-225-12

Figure 2-14. Valves used for water source from darkroom water tank

WARNING

(b) Open valves P1, S8, and S9 (fig. 2-

Immersion heater is HOT. Handle

15).

with care. Allow immersion heater to

cool on a surface that will riot burn.

processing sink (fig. 1-17) with snow.

d. Level Indicator (fig. 1-17). Use the following

(d) Plug the immersion heater (fig. 1-

procedure to measure the level of water in the water

12) into circuit 4 and immerse into snow.

tank.

(e) When there is sufficient water, set

(1) Open the high pressure petcock.

the water pump switch (fig. 1-18) to the ON position.

(2) When water runs freely, close the high-

NOTE

pressure petcock.

Approximately 5 minutes will elapse

NOTE

from the time snow becomes water

If water tank is full (indicated by

until the time water flows from valve

water flowing from valve S8), and

S8.

reading on level gage indicates water

(f) Set the water heater switch (fig. 1-

tank is half empty, bleed water from

17) to the ON position.

valve D12.

(g) Close valve S9 (fig. 2-15). The

e. Outlet and Inlet Pressure Indicators (fig. 1-17).

water tank is now full and ready for operation.

A difference of pressure between the outlet and inlet

(h) Unplug immersion heater (fig. 1-12)

pressure indicators denotes that the filter requires

from circuit 4. Repeat procedures in step (3) above.

cleaning. Refer to paragraph 3-7 for the cleaning

procedures.

2-19