White Rodgers 50A56-956 Manuel d'installation télécharger pdf (Page 7)

OPERATION

To reset the control after system lockout, do one of the

following:

1. Interrupt the call for heat or cool at the thermostat for at least

one second but less than 20 seconds (if ﬂame is sensed

with the gas valve de-energized, interrupting the call for

heat at the thermostat will not reset the control).

2. Interrupt the 24 VAC power at the control for at least one

second. You may also need to reset the ﬂame rollout sensor

switch.

3. After one hour in lockout, the control will automatically reset

itself.

DIAGNOSTIC FEATURES

The 50A56-956 control continuously monitors its own operation

and the operation of the system. If a failure occurs, the LED will

indicate a failure code as shown in the TROUBLESHOOTING.

Ifthefailureisinternaltothecontrol,theLEDwillstayon

solid.Inthiscase,theentirecontrolshouldbereplaced,

asthecontrolisnoteld-repairable.

Failure codes will ﬂash the LED in the following ﬂash-

pause sequences to indicate failure status (each ﬂash will

last approximately 0.25 seconds, and each pause will last

approximately 2 seconds).

FAULT RECALL

The last ﬁve fault codes stored can be displayed on the

diagnostic LED. When the control is in standby mode (no

call for heat or cool), press the FAULT RECALL switch for

approximately two to ﬁve seconds and release. The fault codes

will display beginning with the most recent fault ﬁrst with a one

second pause between codes. After the stored fault codes

have all displayed, the LED will return to normal status. While

displaying the stored fault codes, the control will ignore any

new call for heat, cool or fan. If no fault codes are in memory,

the LED will ﬂash two green ﬂashes then return to normal

status.

FAULT CODE RESET

The stored fault codes can be erased from memory. When

the control is in standby mode (no call for heat or cool), press

the FAULT RECALL switch for ﬁve to ten seconds or until

the diagnostic LED begins to rapid ﬂash. When the switch is

released, the LED will ﬂash three green ﬂashes when memory

has been cleared.

The 50A56-956 has only one serviceable part –an automotive

type fuse, which protects the low voltage transformer from

damage if the output is short-circuited. If the fuse has opened

up, remove whatever caused the short circuit and replace the

fuse with only a 3 Amp automotive type fuse. If the fuse does

not correct the condition, replace the entire control. There are

no other user serviceable parts.

MANUAL FAN ON MODE

If the thermostat fan switch is moved to the ON position, the

optional electronic air cleaner and circulator fan are energized.

The circulator speed is selectable via shunt jumper option E33.

Three choices that can be made are Lo Cool, Heat or Hi Cool.

By moving the shunt jumper location, the desired continuous

fan speed will be attained. When the fan switch is returned to

the AUTO position, the circulator fan and electronic air cleaner

(optional) are de-energized.

E34

DELAY

OFF

BLWR

180

120

180

120

180

120

180

120

Heat Delay-to-Fan-Off

Shunt Jumper E34

Manual Fan Speed

Shunt Jumper E33

Factory Setting

120 Seconds

Factory Setting

HI COOL

LO COOL HEAT

60 Seconds

90 Seconds 180 Seconds

E33

SPEED

FAN

CONT

HI COOL

HEAT

LO COOL

HI COOL

HEAT

LO COOL

HI COOL

HEAT

LO COOL

TWINNING INTERFACE

The control is equipped with a single wire twinning interface which

is a 3/16" spade terminal designated as "TWIN". If twinning is

used, either control will process a call for heat, cool or fan as

described above. However, after the heat-, cool-, or fan-on delay

time expires, both units will energize the circulator blowers at

the same time. Likewise, after the heat-, cool-, or fan-off delay

time expires, both units will de-energize the circulator blowers

at the same time. This allows for proper air ﬂow to be obtained.

To assure proper control operation, both controls must share a

common transformer ground (TR).

To enable twinning, do the following.

1. Power supplied to both furnaces must be from the same

phase of the 24 VAC power to the control.

2. Connect the TWIN terminals on the controls of the furnaces

to be twinned to each other using a single wire (14-22

AWG.).

3. Both controls must be of the same model and type for the

twinning feature to work properly.

SYSTEM LOCKOUT

SYSTEM LOCKOUT FEATURES

When system lockout occurs, the gas valve is de-energized,

the circulator blower is energized at heat speed, and, if ﬂame

is sensed, the inducer blower is energized. The diagnostic

indicator light will ﬂash or glow continuously to indicate system

status. (Systemlockoutwillneveroverridetheprecautionary

features.)

1 2 3 4 5 6 7 8 9 10 11 12

Commentaires sur ces manuels

Pas de commentaire

White Rodgers 50A56-956 Manuel d'installation Page 7

Commentaires sur ces manuels

Produits connexes et manuels pour Thermostats White Rodgers 50A56-956