LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.

TM 5-4120-364-13

for 208 volt, 3-phase, 50/60 Hz power. I t may be converted for use on 120 volt, 3-

p h a s e , 50/60 Hz power by changing the heater elements, adding an electrical jumper,

and reconnecting certain leads (see electrical wiring diagram, figure 3-2). For

cooling, the unit may be operated from an internal or external thermostat.

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.

1-7.

F i g u r e s 11 and 1-2 show the location of the major sections and gives a description

o f the major components of the air conditioner.

DIFFERENCE BETWEEN MODELS.

1-8.

This manual was prepared for the Tiernay Manufacturing Model TM-18K-120/208-3-60.

T h e r e are no differences between models.

PERFORMANCE DATA.

1-9.

1 2 0 / 2 0 8 volts, 50/60 Hz, 3-Phase

Electrical Requirements:

18,000 BTU/HR

Capacity:

1 3 pounds 8 ounces of refrigerant

Refrigerant Capacity:

S p e c i f i c a t i o n BB-F-1421, Type 12

Cabinet

Dimensions:

inches (50cm)

Length:

Width:

inches (ll5cm)

inches (175cm)

Height:

Weight:

596

pounds (268.2kg)

Section III. Technical Principles of Operation

PRINCIPLES OF OPERATION.

1-10.

a. G e n e r a l . T h e a i r c o n d i t i o n e r i s i n a v e r t i c a l c o n f i g u r a t i o n c o n s i s t i n g

o f five sections bolted together as shown in figure ll. The five sections, from top

t o b o t t o m c o n s i s t o f t h e f o l l o w i n g : E v a p o r a t o r Fan Section, Evaporator Coil Section,

C o n d e n s e r Fan Section, Condenser Coil Section, and the Compressor Section.

b. E v a p o r a t o r F a n S e c t i o n . T h e evaporator fan section houses the evaporator

f a n motor which drives two squirrel cage fans, The evaporator fans draw air through

a n air filter, over the evaporator coil mounted in the evaporator coil section, and

exhaust it into the conditioned area.

c. E v a p o r a t o r C o i l S e c t i o n . T h e e v a p o r a t o r c o i l s e c t i o n h o u s e s t h e e v a p o r -

ator coil, air filter, expansion valve, suction line shutoff valve and the liquid

line shutoff valve. Air from the conditioned area is drawn through the air filter

a n d over the coil by the evaporator fans mounted in the evaporator fan section. Heat

is absorbed from the air passing over the evaporator coil by the refrigerant passing

t h r o u g h the coil. This actions serves to cool the air as it flows through the evap-

orator coil.

d. C o n d e n s e r F a n S e c t i o n . The condenser fan section houses the condenser

f a n motor which drives two squirrel c a g e fans identical to those contained in the

1-2