Bunn U3 U3A - Manual (Page 16)

Page 16
RED to Left Tank
Heater (T2)
RED to Terminal
Block(L2)
BLK Thermal
Fuse to Left
Tank Heater
BLK to left
Tank Heater
(L1)
BLK to Right Tank
Heater (T1)
BLK to Terminal
Block (L1)
RED to Right
Tank Heater
(L2)
WHI from Main Harness
(120/208V,120/240V,380V
Three Wire Models, 380V and
440V Four Wire Models)
RED from Main Harness
(208V, 240V Two Wire Models
and 208, 240V Three Wire
Models)
RED to Limit
Thermostat
RED Thermal Fuse
to Left Tank Heater
RED to Terminal
Block (L2)
BLK to Terminal
Block (L2)
RED Thermal Fuse
to Right Tank
Heater
BLK Thermal Fuse
to Right Tank Heater
BLK to Terminal
Block (L1)
120/208V, 120/240V, 208V,
240V, 380V 440V MODELS
230V - CE Models
P1725
FIG.5 CONTACTOR TERMINALS
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
contactor to the contactor mounting bracket, re-
move contactor and protective shield. Discard
contactor.
3. Install new contactor with shield between mount-
ing bracket and contactor and secure with two #8-
32 screws
4. Refer to Fig. 5 and reconnect the wires.
BLK to Limit
Thermostat
10060 080900