Honeywell ST7997 사용자 설명서

69-1204

5

ST7997 OIL BURNER MOUNTED ELECTRIC FAN TIMER

N

HUM

N

N

MED LO

 LO

HI

BLACK

RED

WHITE

VIOLET

N

OIL 

PRIMARY

L1

L1

L2

L2

BURNER/

VALVE

HUMIDIFIER

EAC

L2

THERMOSTAT
5-WIRE

COMPRESSOR
CONTACTOR

RC

RC

F1

ISOLATION

HEAT CALL

CONTROL
ELECTRONICS

LIMIT

RC

W

R

C

C

G

Y

G

Y

G

Y

L1
GND

SCREW TERMINAL

1/4 IN. QUICK CONNECT

CIRCULATOR 
BLOWER

LIMIT
(LINE 
VOLTAGE)

ORANGE

R7997
INTEGRATED
OIL PRIMARY
WITH BLOWER
DELAY

OIL

VALVE

AIR FLOW

SWITCH

BURNER 
MOTOR

POWER
VENT
MOTOR

J-BOX

M12923

K1

K2

EAC

N

1K2

1K1

2K2

2K1

COOL

HEAT

MED HI

CONTINUOUS

FURNACE

LIMIT

T

T

UNUSED

WIRES

OPTIONS

Constant circulating fan is
connected. (Optional connectors are
available for separate circulating fan
speed tap.)

a.

Circulating fan is energized at low speed when there is
no call for heat, cool or fan.

b.

If fan operation is required by a call for heat, cool or
fan, the ST7997 switches off the continuous fan speed
tap before energizing the other fan speed.

Electronic air cleaner is connected.  
(Optional connectors are available
for 120 Vac electronic air cleaner.)

Electronic air cleaner (EAC) connections are energized when
the heat or cool speed of the circulating fan is energized.
EAC connections are not energized when the optional
continuous fan terminal is energized.

NOTE: If continuous fan option is selected, connect EAC

to line voltage input (L1).

Humidity control is connected.  
(Optional connectors are available
for 120 Vac humidifier.)

Humidifier connections are energized when burner motor is
energized on standard models and when oil valve is
energized on purging models.