Adjust. - TM-5-4120-356-140140

TM 5-4120-356-14

(k) Reinstall the condenser fan and remove the suction pressure gage.

( 3 ) Adjust.

CAUTION

N e v e r adjust the quench valve unless

a b s o l u t e l y necessary. When adjusting

t h e quench valve, allow the unit to

run on "COOL" at least 20 minutes be-

tween each adjustment. Make sure that

t h e condenser fan and all panels are

s e c u r e d in place during the running

period.

( a ) Refer to figure 4-20 and remove the seal cap from the quench

valve.

(b) Refer to figure 4-20 and locate the adjusting screw. Turning

t h e adjusting screw counter-clockwise increases flow and lowers superheat. Turning

t h e adjusting screw clocknwise decreases flow and raises superheat. Four complete

t u r n s of the adjusting screw will raise or lower superheat by approximately 2F (1.1C).

T u r n the adjusting screw to obtain superheat of 30.4 0.5F (0.88C 0.5C).

( c ) Allow the unit to run on "COOL" for approximately 20 minutes be-

fore adjusting to a new setting.

( d ) C a l c u l a t e s u p e r h e a t o f q u e n c h v a l v e . I f superheat is now 30.4F

0.5F (0.88C 0.5C), no further adjustment is necessary. I f s u p e r h e a t i s n o t

c o r r e c t , continue adjustment cycle until superheat reaches the required temperature.

(e) Refer to figure 4-20 and install the seal cap on quench valve.

( f ) Remove the condenser fan and the thermometer bulb from the suction

l i n e near the power bulb of the quench valve.

(g) Reinstall the condenser fan.

(4) Repair.

I f quench valve is leaking refrigerant, refer to figure 4-20

a n d repair valve.

( 5 ) R e p l a c e . I f damage or defects are found which would impair service-

ability, replace the quench. Refer to steps (6) and (7) for removal of defective

valve and the installation of a new valve.

( 6 ) Removal.

( a ) Turn the selector switch to the "OFF" position and disconnect the

air conditioner from the electrical power source.

( b ) Refer to paragraph 3-15b and remove the condenser fan.

( d ) Refer to figures 4-12 and 4-20 and remove the quench valve.