Bryant 453 Instrucciones de operaciones descargar pdf (Pagina 19)

5. If preceding checks did not re-

veal the cause of malfunction,

then access to the control

panel is required as shown in

Figure 3.43. The first step in

gaining access is to remove

the two control knobs (A), then

remove the (6) Phillips head

screws (B) as shown. Once

control panel has been re-

moved, you need to remove

(2) Phillips head screws (C).

Then pull the control mounting

bracket forward. This allows

access to the controls.

6. Step 6, 7 & 8 apply to 3-Way

units only. If you are checking

a 2-Way skip to Step 9. Set AC-

ELEC STDBY-DC switch to

ELEC STDBY (not DC). With a

Volt-Ohm meter, check for 12

Volts DC between Point 1 and

ground shown in Figure 3.44.

Then check Point 2. One test

point should read 12 Volts

and the other should read 0

Volts (the point which reads

12 Volts is the switch input

terminal). This confirms volt-

age to the switch. If neither

test point reads 12 Volts,

check for bad connections.

7. Set AC-ELEC STDBY-DC

switch to DC; Mode Selector

to ELEC; Thermostat to

COLDEST.

8. Check for 12 Volts at Point 1

and ground and Point 2 and

ground at switch as shown in

Figure 3.45. Normal readings

should show 12 Volts on both

terminals. If 0 Volts are read,

check wiring connections.

9. With AC-ELEC STDBY-DC

switch to DC; Mode Selector to

ELEC; Thermostat to COLD-

EST, check for 12 Volts at each

terminal of the combination

control and ground as illus-

trated in Figures 3.46 and 3.47.

Normal readings should show

12 Volts on both terminals.

10. If there is 0 Volts on both ter-

minals, check wiring connec-

tions. If there is 12 Volts on

only one terminal, replace the

Combination Control. If unit is

B101

Chassis

Ground

Rear View of AC-

ELEC STDBY-DC Switch

Figure 3.44 12 Volt Check at Switch Inlet

Chassis

Ground

Rear View of AC-

ELEC STDBY-DC Switch

Figure 3.45 12 Volt Check at Switch’s Center Contacts

Chassis

Ground

Figure 3.46 12 Volt Check at Combination Control

Chassis

Ground

Figure 3.47 12 Volt Check at Combination Control Switch

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