Csir Compressor Wiring Diagram With Potential Relay

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

COMPRESSOR MOTOR

AND COMPONENT

INFORMATION

I. Single Phase Compressor Motor Types . 16

II. PSC Motor Starting . . . . . . . . . . . . . . . . . 18

III. Hermetic Compressor Thermal

Protectors . . . . . . . . . . . . . . . . . . . . . . . . 19

IV. Compressor Motor Starting Relays . . . . . 27

V. Selecting Capacitors . . . . . . . . . . . . . . . . 32

VI. Identification of Terminal Pins . . . . . . . . . 34

VII. Fuse and Circuit Breaker Sizing . . . . . . . 36

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Chapter 3

I. Single Phase Compressor

Motor Types

Tecumseh hermetic compressors contain motors

designed for speciﬁc requirements of starting torque

and running efﬁciency. There are four general types

of single phase motors, each distinctly different from

the others. Each type of motor may have two to four

different conﬁgurations depending on the compres-

sor components.

A. Resistance Start—Induction Run (RSIR)

This motor, also known as a split-phase motor, is

used on many small hermetic compressors up

through 1/3 HP. The motor has low starting torque

and must be applied to completely self-equalizing

capillary tube systems such as household refrigera-

tors, freezers, small water coolers, and dehumidiﬁ-

ers. This motor has a high resistance start winding

which is not designed to remain in the circuit after

the motor has come up to speed. A relay is necessary

to perform the function of disconnecting the start

winding as the motor comes up to design speed.

Three types of relays are used with this motor:

•a current relay,

•a wired-in Positive Temperature Coefﬁcient

(PTC) relay, or

•a module Positive Temperature Coefﬁcient

(PTC).

B. Capacitor Start—Induction Run (CSIR)

The CSIR motor is similar to RSIR except a start

capacitor is included in series with start winding to

produce a higher starting torque. This is commonly

used on commercial refrigeration systems through

3/4 HP. Two types of relays are used with this

motor:

•a current relay, or

•a potential relay.

Figure 3-1.

RSIR motor diagram with current relay.

Line 1

Line 2

Ground

Control

Relay - Current

External Thermal

Protector

Start Winding

Main Winding

Compressor - Unit

Ground

Figure 3-2.

RSIR motor diagram with wired-in

PTC relay.

4 T M Thermal Protector

Identified Conductor

(115 Volt Only - Neutral)

Line 1

Line 2

Ground

Start Winding

Main Winding

PTC Relay

Compressor - Unit

Ground

Alt. 3/4" Thermal Protector

Control

Figure 3-3.

CSIR motor diagram.

Line 1

Line 2

Ground

Control

Relay - Current

External Thermal

Protector

Start Winding

Main Winding

Compressor - Unit

Ground

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

C. Capacitor Start and Run (CSR)

This motor arrangement uses a start capacitor and a

run capacitor in parallel with each other and in

series with the motor start winding. This motor has

high starting torque, runs efﬁciently, and is used on

many refrigeration and air conditioning applications

through 5 HP. A potential relay removes the start

capacitor from the circuit after the motor is up to

speed. This motor may use either:

•an external thermal protector, or

•an internal thermal protector.

D. Permanent Split Capacitor (PSC)

Here a run capacitor is in series with the start wind-

ing. Both run capacitor and start winding remain in

the circuit during start and after motor is up to

speed. This normal starting torque motor is sufﬁ-

cient for capillary and other self-equalizing systems.

No start capacitor or relay is necessary. For addi-

tional starting torque, a proper start assist kit may be

added (see Figure 3-6). Some start assist kits may

include:

•a wired-in Positive Temperature Coefﬁcient

(PTC) relay, or

•a module Positive Temperature Coefﬁcient

(PTC) relay.

This motor may use either:

•an external thermal protector, or

•an internal thermal protector.

PSC motors are basically air conditioning compres-

sor motors and are very common up through 5 HP.

Figure 3-4.

CSR motor diagram.

Relay -

Potential

Compressor -

Unit Ground

Line 1

Line 2

Ground

Start Winding

Main Winding

Control

External or Internal

Thermal Protector

Figure 3-5.

PSC motor diagram.

Compressor -

Unit Ground

External or Internal

Thermal Protector

Run Capacitor

Line 1

Line 2

Ground

Start Winding

Main Winding

Control C

Figure 3-6.

PSC motor diagram with start assist kit

that includes a module PTC relay.

Line 1

Line 2

Ground

Compressor -

Unit Ground

PTC

Relay

Plug-In

Run Capacitor

PTC Starting and

Protector Package

Thermal Protector

Start Winding

Main Winding

Chapter 3

II. PSC Motor Starting

Tecumseh Products Company has pioneered in

encouraging the development of Permanent Split

Capacitor compressor motors. This type of motor

eliminates the need for potentially troublesome and

costly extra electrical components (start capacitors

and potential motor starting relays). (See Figure

Figure 3-7.)

To fully realize the capabilities of this simpliﬁed type

of compressor motor, it is necessary to understand

its starting and operating characteristics and the

ﬁeld conditions which can affect it.

The following conditions affect PSC motor starting:

•Low voltage: Reduces motor starting and run-

ning torque. A 10% voltage drop reduces a

motor's starting ability by 19%. Low voltage

can cause no start, hard start, light ﬂicker, and

TV screen ﬂip ﬂop.

Minimum starting voltage for the compressor

when it is attempting to start (locked rotor) is:

•Unequalized system pressure: Head and suc-

tion pressures must be equal and not more than

170 psig. Refrigeration metering device (cap

tube or TX valve) should equalize system pres-

sures within 3 minutes. Unequal system pres-

sure may be caused by excessive refrigerant

charge, short cycling thermostat, or system

restriction.

•Circuit breaker or fuse trips : Branch circuit

fuses or circuit breakers sized too small will

cause nuisance tripping (see "Fuse and Circuit

Breaker Sizing" on page 36). If the fuse or cir-

cuit breaker trips, see "Identifying Compressor

Electrical Problems" on page 47 for electrical

troubleshooting techniques.

•Electrical components : A failed run capacitor

will not allow the compressor to start, and it

will trip the thermal protector. See "Identifying

Compressor Electrical Problems" on page 47

for electrical troubleshooting techniques.

Figure 3-7.

Circuit diagram for PSC compressors.

Compressor -

Unit Ground

External or Internal

Thermal Protector

Run Capacitor

Line 1

Line 2

Ground

Start Winding

Main Winding

Control C

Table 3-7: Minimum Starting Voltage

Serial Label Voltage Min. Voltage for Start

115 103

208 188

230 207

230/208 198

265 239

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

III. Hermetic Compressor Thermal

Protectors

Hermetic compressor motors are protected from

overheating by thermal protectors built into or

mounted in contact with the compressor motor. See

the Electrical Service Parts Guide Book for correct

replacement thermal protectors. Typical wiring dia-

grams are shown on pages 51 to 82.

The thermal protector device (see Figure 3-8), when

ﬁrmly attached to the compressor housing, quickly

senses any unusual temperature rise or excess current

draw. The bi-metal disc within the thermal protec-

tor (see Figure 3-9) reacts to either excess tempera-

ture and/or excess current draw by ﬂexing

downward, and disconnecting the compressor from

the power source.

Figure 3-8.

External thermal protector. (Models AE,

TP, TH, AK, AJ, CAJ, AZ, RK, RG, TW,

and some CL.)

Figure 3-9.

Bi-metal disc.

Open Closed

Figure 3-10.

AE refrigeration compressor

showing (1) hermetic terminal,

(2) thermal protector, (3) thermal

protector clip, (4) push-on relay,

(5) protective terminal cover, and

(6) bale strap.

Figure 3-11.

AE refrigeration compressor with

the thermal protector and relay

assembled.

Chapter 3

A. Internal Thermal Protectors

Internal thermal protectors are completely internal

and tamper-proof. They cannot be by-passed.

Single Phase Motor Thermal Protectors

Internal thermal protectors detect excess heat and/or

current draw. They are located in the following sin-

gle phase motors: AB, AW, AH, AV, and AG.

3-Phase Motor Thermal Protectors

The 31HM and 32HM on-winding motor protec-

tors are 3-phase line break, automatic reset devices

wired in series with each phase at the neutral point

and mounted on the windings. They are used in AB,

AG, AV, and AN models.

Table 3-2: Facts About Thermal Protectors

External Line-Break Thermal

Protectors

•Currently used on all AE, AK, AZ, RK, and AJ models

•Sense motor current and housing temperature or combination

thereof

•Break line current when tripped

•Generally do not protect against loss of charge

•When, by design, no air ﬂow passes over housing, a special

"static" thermal protector must be used

•Are designed for speciﬁc compressors and their intended

application. Make no substitutions

•Will not protect motor if compressor is operated outside its

evaporator temperature range

Internal Line-Break Thermal

Protectors

•Currently used on all AH, AB, AV, AG, AW, and most AN and SF

models

•Sense motor current and motor winding temperature or

combination thereof

•Break line current when tripped

•Generally protect against loss of charge

•Will not protect motor if compressor is operated outside its

evaporator temperature range

•Not repairable or replaceable

Line Voltage-Electronic Protection

Module

(NOTE: For more speciﬁc details

consult the authorized wholesaler.)

•Currently used on some AN and SF models

•Employs use of solid state temperature sensors in motor

windings and compressor discharge mufﬂer

•Sensor resistance values change with temperature variations

•Module will interrupt power to the contactor coil when resistance

values of sensors exceed the speciﬁed range. This power

interruption thus stops the compressor motor

•Module provides protection against:

•Abnormal locked rotor conditions

•Loss of refrigerant

•High compressor discharge temperatures

•Excessive current conditions

•Time delays of 3 to 5 minutes occur on power interruption or

sensor trip

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

B. "AN" Wiring on Typical 230/200 Volt

System with Electronic Protection

Module

The Model AN compressors are available with an

advanced solid state protection system. Sensors are

provided in each leg of the compressor motor wind-

ings to guard against overloading and single phasing.

Additionally, a sensor is in the internal discharge line

to detect excessive discharge gas temperatures.

Notes on the compressor electronic protection sys-

tem:

•The compressor will not run if a jumper is

placed across terminals S and S 1 .

•Terminals M1 and M 2 are a normally closed

switch actuated by the motor sensor circuit.

Switch contacts are rated at 2.5 amps at 265

volts maximum.

•Do not expose the protection module to pro-

longed ambient temperature higher then

150°F.

•Module has built-in time delay. Power inter-

ruption or sensor trip will cause 3 to 5 minute

delay before restart.

•If sensor circuit trips and motor feels cool,

check the return gas temperature. It should not

be more than 65°F entering the compressor.

Chapter 3

B. "AN" Wiring on Typical 230/200 Volt System with Electronic Protection Module - Continued

2 Speed Motor

Connections

Line Voltage

C'Case Heaters

Contactor

230/200-60-3

# 14 Min.

See Table 3-3

Use Copper Conductors Only

24 Volt

Compressor

Sensors Compressor

Power

Control

Circuit

Contactor

Coil

Table 3-3: "AN" Wiring on Typical System

Model

AN5590E/F

AN5610E/F

AN5612E/F

AN5614E/F

#8 TW

#6 TW

92,500

100,000

122,000

140,000

172

183

229

269

RLA LRA

Capacity

BTU/HR

Min.

Cond.

Size

Control Line

15AA1104C

Electronic Protection Module

Figure 3-12.

"AN" wiring on typical 230/200 volt system with electronic protection module.

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

C. "AN" Wiring on Typical 460 Volt System with Electronic Protection Module

2 Speed Motor

Connections

Line Voltage

C'Case Heaters

T1T2T3

M1T1

L2L3

*Contactor

460-60-3

# 14 Min. Transformer

460V Input 230V Output

230V 460V

Run New Lead From M1

To Contactor Coil

Remove Existing Lead At

Contactor Coil And Connect To M2 # 14 Min.

See Table 3-4

Use Copper Conductors Only

24 Volt

Compressor

Sensors Compressor

Power

Control

Circuit

Control Line

230V

15AA1104C

Electronic Protection Module

S1C1L1L2 L3R1R2R3

Table 3-4: "AN" Wiring on Typical 460 Volt System

Model

AN5590E/F

AN5610E/F

AN5612E/F

AN5614E/F

#12 TW

#10 TW

92,500

100,000

122,000

140,000

14.5

116

135

RLA LRA

Capacity

BTU/HR

20 A

25 A

30 A

Min.

Cont.*

Size

Min.

Cond.

Size

*Contactor ampere rating is at compressor rated voltage.

# 14 Min.

Figure 3-13.

"AN" wiring on typical 460 volt system with electronic protection module.

Chapter 3

D. "AN" Wiring on Typical System with Thermal Protector

Figure 3-14.

"AN" wiring on typical system with thermal protector.

2 Speed Motor

Connections

Contactor

To Line

# 14 Min.

See Table 3-5

Compressor

Power

Control

Circuit

Table 3-5: "AN" Wiring on Typical System

with Thermal Protector

Model

AN5590G/H

AN5610G/H

AN5612G/H

AN5614G/H

AN5590G/H

AN5610G/H

AN5612G/H

AN5614G/H

230/200-60-3

460-60-3

#8 TW

#6 TW

#12 TW

#10 TW

92,500

100,000

122,000

140,000

92,500

100,000

122,000

140,000

14.4

20.8

172

183

229

269

93.3

116

135

RLA LRA

Capacity

BTU/HR

Min.

Cond.

Size

Voltage

40 A

50 A

60 A

25 A

30 A

Min.

Cont.*

Size

Not Used On

Internal Line Break

Models (G & H Suffix)

Use Copper Conductors Only

24 Volt

Compressor

Sensors

*Contactor ampere rating is at compressor rated voltage.

Line Voltage

C'Case Heaters

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

E. Small Terminal Block with Thermal Protector

Figure 3-15.

Small terminal block wiring on typical system with thermal protector.

T1T2T3

L1L2L3

Crankcase Heaters

To Control Circuit

Clear Tie Compressor Terminal Fence

Contactor

Black Tie

Ground

3 Ph. Incoming Power

Chapter 3

F. Small Terminal Block with Electronic Protection Module

Figure 3-16.

Small terminal block wiring on typical system with electronic protection module.

T2 T3

L1L2 L3

To Control Circuit

24 or 120 or 240 V.A.C.

Single Phase

Clear

Tie Compressor Terminal Fence

Contactor Coil

Contactor

Black Tie

Ground

M1T1

S1S2

To Protection

Module Line Circuit

Electronic Protection Module

15AA1104 (See Table 3-6)

Control Line

2.5A. Max.

24/115/230 V.A.C.

3 PH. Incoming Power

Texas

Instruments

Parts

Number

15AA1104A

15AA1104B

15AA1104C

90613

90613-2

90613-1

24 V.A.C.

115 V.A.C.

208 or 230 V.A.C.

Line

Circuit

T1, T2,

V.A.C.,

1-PH

Tecumseh

Part

Number

24 or 115 or 230 V.A.C.

Control Circuit

M1, M2,

V.A.C., 1-PH

Table 3-6: Small Terminal Block Information

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

IV. Compressor Motor Starting

Relays

A hermetic motor starting relay is an automatic

switching device to disconnect the motor start

capacitor and/or start winding after the motor has

reached running speed.

Never select a replacement relay solely by horse-

power or other generalized rating. Select the correct

relay from the Tecumseh Electrical Service Parts

Guide Book.

There are two types of motor starting relays used in

refrigeration and air conditioning applications: the

current responsive type and the potential (voltage)

responsive type.

A. Current Type Relay

When power is applied to a compressor motor, the

relay solenoid coil attracts the relay armature

upward causing bridging contact and stationary

contact to engage. This energizes the motor start

winding. When the compressor motor attains run-

ning speed, the motor main winding current is such

that the relay solenoid coil de-energizes allowing the

relay contacts to drop open thereby disconnecting

motor start winding.

The relay must be mounted in true vertical position

so armature and bridging contact will drop free

when relay solenoid is de-energized.

B. PTC Type Relay

Solid state technology has made available another

type of current sensitive relay—a PTC starting

switch. Certain ceramic materials have the unique

property of greatly increasing their resistance as they

heat up from current passing through them. A PTC

solid state starting device is placed in series with the

start winding and normally has a very low resistance.

Upon startup, as current starts to ﬂow to the start

winding, the resistance rapidly rises to a very high

value thus reducing the start winding current to a

trickle and effectively taking that winding out of

operation.

Usage is generally limited to domestic refrigeration

and freezers. Because it takes 3 to 10 minutes to cool

down between operating cycles, it is not feasible for

short cycling commercial applications.

C. Potential Type Relay

Generally used with large commercial and air condi-

tioning compressors (capacitor start, capacitor run)

to 5 HP. Relay contacts are normally closed. The

relay coil is wired across the start winding and senses

voltage change. Starting winding voltage increases

with motor speed. As the voltage increases to the

speciﬁc pickup value, the armature pulls up, open-

ing the relay contacts, de-energizing the start wind-

ing capacitor. After switching, there is still sufﬁcient

voltage induced in the start winding to keep the

Figure 3-17.

Current type relay.

Figure 3-18.

PTC type relay.

Chapter 3

relay coil energized and the relay starting contacts

open. When power is shut off to the motor, the volt-

age drops to zero, the coil is de-energized, and the

start contacts reset.

When changing a compressor relay, care should be

taken to install the replacement in the same position

as the original.

Figure 3-19.

Potential type relay.

Table 3-7: Facts About Starting Relays

Relay Type Compressor

Motor Type Characteristics

Current Relay RSIR and CSIR

•Sense starting current to main (run) windings

•Contacts normally open

•Contacts close and then release in less than 1 second

as motor starts

•Must be installed vertically since contacts open by

gravity

PTC Relay RSIR and PSC

•Sense starting current to start winding

•Solid state device whose resistance increases with

heat from current as motor starts

•Takes 3 to 10 minutes to cool down between operating

cycles

Potential Relay CSR •Sense voltage generated by start winding

•Contacts normally closed

•Contacts open in less than 1 second as motor starts

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

Potential Type Relay Supplier Code Designations

In recent years, Tecumseh has used an increasing

number of potential relays with hermetic compres-

sors. A large number of these have been used on air

conditioning applications, but there are also many

other applications. Since there are many variations

with regard to these relays such as number of termi-

nals, coil group, hot pick up, and mounting posi-

tion, an explanation of the code numbers should be

useful in the ﬁeld.

Tecumseh has two major suppliers of potential

relays: the General Electric Company and the sup-

plier of White Rodgers relays. An explanation of the

code designation for relays manufactured by each of

these companies is provided in Figures 3-20 and 3-

21.

Figure 3-20.

Explanation of GE Potential Relay Code.

3ARR3- A 3

Potential Relay

Type Mounting

Position

Number of

Terminals and

Bracket

Coil Group

(Continuous

Voltage)

Calibration

(Hot Pickup)

(Volts)

A = 5 screw terminal "L" bracket

B = 5 screw terminal Flat bracket

C = 3 screw terminal "L" bracket

D = 3 screw terminal Flat bracket

E = 5 quick connect terminal "L" bracket

See note on page 31.

1 = Face down

2 = Face up

3 = Face out — numbers horizontal

4 = Face out — rotated 90 clockwise from number 3 position

5 = Face out — numbers upside down - horizontal

6 = Face out — rotated 90 counterclockwise from number 3 position

A = 260-280

B = 280-300

C = 300-320

D = 320-340

E = 340-360

F = 350-370

G = 360-380

H = 365-395

J = 120-130

K = 130-140

Note: Room temperature

calibration is 5 to 7% lower

than these values.

2 = 168

3 = 332

4 = 502

5 = 253

6 = 420

7 = 130

8 = 214

10 = 375

L = 140-150

M = 150-160

N = 160-170

P = 170-180

R = 180-190

S = 190-200

T = 200-220

U = 220-240

V = 240-260

W = 210-230

Example: 3ARR3-A5C3

Chapter 3

Figure 3-21.

Explanation of White Rodgers Potential Relay Code.

128- 12 2- 1 335C A

Type of

Bracket Mounting

Position

Contact

Structure

Terminals,

Type and

Location

Customer's

Part Number

(To be stamped on relay)

Potential

Relay

Type

Coil Group

(Continuous

Voltage)

Calibration

(Hot Pick Up)

(Volts)

11 = Flat Bracket remote (Tecumseh)

12 = "L" Bracket (Tecumseh)

16 = "L" Bracket for "FB" model compressors

20 = "L" Bracket for Tecumseh Twins = 1 1/2 HP and larger

21 = "L" Bracket for capacitor box mounting

29 = Flat Bracket (Marion) was "14" (under cover)

See note on page 31.

1 = Face down

2 = Face up

3 = Face out - horizontal - numbers upside down

4 = Face out - 90 clockwise from number 3 position

5 = Face out - horizontal - numbers right side up

6 = Face out - 90 counterclockwise from number 3 position

2 = SPNC - less than 1 1/2 HP

6 = SPNC - 1 1/2 HP and Larger

11 = 3 screw terminal

12 = 4 screw terminal (seldom used)

13 = 5 screw terminal

23 = 5 quick connect terminals

1 = 130

2 = 170

3 = 256

4 = 336

5 = 395

6 = 420

7 = 495

A = 260-280

B = 280-300

C = 300-320

D = 320-340

E = 340-360

F = 350-370

G = 360-380

H = 365-395

J = 120-130

K = 130-140

L = 140-150

M = 150-160

P = 170-180

R = 180-190

S = 190-200

T = 200-220

U = 220-240

V = 240-260

W = 210-230

Note: Room temperature calibratio

n is 5 to 7% lower than these values.

Example: 128-122-1335CA

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

NOTE: As noted above, the 4th digit in the code

number of G.E. relays and the 7th digit for White

Rodgers relays indicates the position in which the

relay is to be mounted. It is of utmost importance

that the relay be mounted in the required posi-

tion.Mounting in any other position can change the

relay's operating characteristics enough so that the

compressor will not start properly. This can result in

compressor motor failure.

Figure 3-22.

Potential type relay mounting positions.

Pos. 1 Pos. 2 Pos. 3

Pos. 4 Pos. 5 Pos. 6

Chapter 3

V. Selecting Capacitors

Never use a capacitor with a lower voltage rating

than that speciﬁed. A higher voltage rating than that

speciﬁed is acceptable.

A. Start Capacitor Bleeder Resistors

Modern high power factor, low current single phase

compressor motors which require start and run

capacitors used with potential type relays can create

electrical circuits which could cause starting relay

damage resulting in compressor failure.

The high voltage stored in the start capacitor could

discharge across the contacts of the starting relay

thus welding them and preventing the relay from

functioning. Capacitor failure and/or start winding

failure could result.

To eliminate this, Tecumseh Products Company

start capacitors are equipped with bleeder resistors

wired across the capacitor terminals. No start capac-

itor used in conjunction with a potential relay and

run capacitor should be installed without such a

bleeder resistor.

In an emergency where no bleeder resistor equipped

capacitors are available, then a two watt 15,000 ohm

resistor can be obtained and soldered across the

capacitor terminals.

B. Start Capacitor Substitution

If the speciﬁed start capacitor is not available, you

may use the next larger sized MFD capacitor at the

same or higher voltage rating. Do not add excessive

starting capacitance.

C. Run Capacitors

Since January 1979, capacitors provided by Tecum-

seh have contained non-PCB oils or have been con-

structed using non-PCB impregnated metallized

paper electrodes and polypropylene dielectric. These

capacitors are protected against case rupture, if fail-

ure occurs, by a device within the capacitor can. The

operation of this safety device could cause the termi-

nal end to bulge outward 1/2". Suitable head space

and/or rubber caps should be provided when install-

ing such capacitors.

In some instances, for reasons of both space and eco-

nomics, it is advantageous to use two capacitors

whose MFD values add up to the total amount spec-

iﬁed. In these cases, the capacitors should be con-

nected in parallel. Rated voltage for each should not

be less than that speciﬁed.

The tolerance on a run capacitor is ±10%, and

therefore only one rating ﬁgure is given. You should

not go below this ﬁgure on any application. You

may exceed this ﬁgure by a small amount, and the

limits are shown in this table:

Remember the voltage rating of all capacitors must

be the same or greater than the original rating. If

you do not know the voltage, use 370 volt capacitors

on 115 volt units and 440 volt capacitors on 230

volt units.

Figure 3-23.

15000 OHMS 2 WATT ± 20%

bleeder resistor wired across

capacitor terminals.

Table 3-8: Limits for Run Capacitor Ratings

Speciﬁc Rating Maximum Addition

10 to 20 MFD + 2 1/2 MFD

20 to 50 MFD + 5 MFD

Over 50 MFD + 10 MFD

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

Table 3-7: Facts About Capacitors

Capacitor Type Compressor

Motor Type Characteristics

Start Capacitor CSIR and CSR

•Designed to operate for only a few seconds

during start

•Taken out of start winding circuit by relay

•Excessive start capacitor MFD increases

start winding current, increases start winding

temperature, and may reduce start torque

•Capacitors in CSR motors should have

15,000 ohm, 2 watt bleed resistor across

terminals

•Capacitor rated voltage must be equal to or

more than that speciﬁed

•Capacitor MFD should not be more than that

speciﬁed

Run Capacitor RSIR, CSR, and PSC

•Permanently connected in series with start

winding

•Excessive MFD increases running current

and motor temperature

•Fused capacitors not recommended for CSR

and not required for PSC motors

•Capacitor rated voltage must be equal to or

more than that speciﬁed

•Capacitor MFD should not exceed limits

shown in Table 3-8 on page 32

VI. Identiﬁcation of Terminal Pins

There are several different types of terminals used on

the various models of Tecumseh compressors.

Tecumseh terminal pins are now always thought of

in the order: Common, Start, Run. To identify the

terminal pins, we read the order exactly as we would

read a book: That is, we start at the top left hand

corner and read across the ﬁrst "line" from left to

right. We then drop down to the second line starting

at the left and read across. Some compressor models

have terminal pin identiﬁcation embossed on the

protective terminal cover. While the protective ter-

minal cover may identify the terminal pins, it is pri-

marily designed to reduce the risk of serious injury

or death from electrocution or terminal venting

with ignition. Never energize the system unless the

protective terminal cover is securely fastened.

Push-On Terminal Pins

P, R, AP & AR Models (1953 to phaseout)

T & AT Models

AZ & AE (Refrigeration Models)

Spade Type Terminal Pins

AU & AR26 Air Conditioning Models

AE Air Conditioning Models

AW, AB, AJ, AH & RK Models

Spade Type Terminal Pins

AV Models

Internal Thermostat

Terminal Pins

Many CL Models

Spade Type Terminal Pins

S & C Models (1955 to phaseout)

AK Models

Figure 3-24.

Current arrangements.

Common

Run Start

Common

Run Start

Common Start

Run

Common

Run

Start

A LOOK AT SERVICE SAFETY

Compressor Motor and Component Information

Screw-On Type Terminal Pins

AG, AN & SF Models

Screw-On Type Terminal Pins

CL Models

Screw-On Type Terminal Pins

AN Terminals

Figure 3-24.

Current arrangements - continued.

Common

Run

T1T2

Start

Run

1 Phase L

3 Phase

Common

1 Phase Start

1 Phase

24 Volt

Compressor

Sensors Line Voltage

Crankcase Heaters

Use Copper Conductors Only

Compressor

Power 2 Speed Motor

Connections

C1 L 1 L 2 L 3 R 1 R 2 R 3

S1 S

Chapter 3

VII. Fuse and Circuit Breaker

Sizing

The following information applies to Compressor

Motor - Branch Circuit, Short Circuit and Ground

Fault Protection only.

A. NEC Article 440

Hermetic compressors should be protected in accor-

dance with Article 440 of the National Electric

Code which calls for substantially larger circuit

breakers than are required for open type motors.

B. Maximum Size

The maximum size of the fuse or circuit breaker

used to protect against short circuit and/or ground

fault of a unit utilizing a hermetic compressor shall

be no more than the sum of 225% of the compressor

Related Load Amps (RLA) as marked on the system

serial label, plus the RLA values of each of the other

motors which use the same branch circuit.

C. Minimum Size

The minimum value of the fuse or circuit breaker

shall be no less than 175% of the RLA of the com-

pressor.

The interpretations and directions given above apply

only to single branch power supplies, and do NOT

pertain to any plug-in type of appliances. Also, see

"PSC Motor Starting" on page 18.

Source: https://usermanual.wiki/Document/compressor.509956308/html

Posted by: bonniewitheitayaeo.blogspot.com

Bonnie Witheitay

Csir Compressor Wiring Diagram With Potential Relay

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