SERVICE (cont.)

CONTACTOR (cont.)

9.Check for continuity across the terminals on the left side of the contactor by manually closing the contacts. Continuity must not present when the contact is released.

10.Check for continuity across the terminals on the right side of the contactor by manually closing the contacts.Continuity must not be present when the contact is released.

If continuity is present as described, the contactor is operating properly.

If continuity is not present as described, replace the contactor.

Removal and Replacement:

1.Disconnect all the wires from the contactor.

2.Remove the two #8-32 screws securing the con- tactor to the contactor mounting bracket, remove contactor and protective shield. Discard contac- tor.

3.Install new contactor with shield between mounting bracket and contactor and secure with two #8-32 screws

4.Refer to Fig. 5 and reconnect the wires.

BLK to Right Tank

 

 

Heater (T1)

 

RED to Left Tank

BLK to Terminal

 

 

Heater (T2)

Block (L1)

 

RED to Terminal

 

 

Block(L2)

BLK to left Tank Heater (L1)

RED to Right

Tank Heater

(L2)

 

WHI from Main Harness

BLK to Limit

(120/208V,120/240V,380V

Three Wire Models, 380V and

Thermostat

440V Four Wire Models)

 

 

RED from Main Harness

 

(208V, 240V Two Wire Models

 

and 208, 240V Three Wire

BLK to Terminal Block (L2)

BLK Thermal

Fuse to Left

Tank Heater

RED Thermal Fuse to Right Tank Heater

BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block (L1)

RED Thermal Fuse to Left Tank Heater RED to Terminal Block (L2)

RED to Limit

Thermostat

Models)

120/208V, 120/240V, 208V,

240V, 380V 440V MODELS

230V - CE Models

FIG.5 CONTACTOR TERMINALS

P1725

Page 16

10060

080900

 

Page 16
Image 16
Bunn U3A service manual Service Contactor

U3A, U3 specifications

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