파트넘버.co.kr ST9120U 데이터시트 PDF


ST9120U 반도체 회로 부품 판매점

Universal Electronic Fan Timers



Honeywell 로고
Honeywell
ST9120U 데이터시트, 핀배열, 회로
ST9120U
Universal Electronic Fan Timers
APPLICATION
The ST9120U Universal Electronic Fan Timers integrate
control of all combustion blower and circulating fan
operations in a gas warm air appliance. This control is
the central wiring point for most of the electrical
components in the furnace. The basic purposes of the
ST9120U are to monitor the thermostat for heat, cool and
fan demands, run the induced draft blower motor and run
a circulating fan (up to two speeds) as required. The
electronic fan timers also monitor limit switch strings and
energize separate ignition control systems through spst
pressure switches. The ST9120U can replace any
ST9101 or ST9120 listed in Table 2 below. The electronic
fan timers feature a field-adjustable heat fan-on delay, a
field-adjustable heat fan-off delay, a field-adjustable cool
fan-on delay and a fixed cool fan-off delay.
Electronic air cleaner (EAC) and humidifier (HUM)
convenience terminal connections are provided as an
option. Continuous low speed indoor air circulation is
also provided.
SPECIFICATIONS
Electrical Ratings:
Power Voltage Requirements: 18 to 30 Vac, 60 Hz.
Contact Ratings:
Combustion Blower:
1.5A full load, 10A locked rotor at 115 Vac.
0.75A full load, 5A locked rotor at 230 Vac.
(Reduce full load rating by humidifier [HUM] load.)
Circulating Fan:
Heat-Cool speed:
15A full load, 30A locked rotor at 115 Vac.
7.5A full load, 15A locked rotor at 230 Vac.
(Reduce full load rating by electronic air cleaner [EAC]
load.)
Continuous speed (optional):
8A full load, 16A locked rotor at 115 Vac.
4A full load, 8A locked rotor at 230 Vac.
EAC and HUM: 0.8A maximum combined load at 115
Vac.
Thermostat Load: 0.10A plus ignition system load.
INSTALLATION INSTRUCTIONS
On/Off Delay Settings:
Heat Speed:
Delay On: Field-adjustable, 30 or 60 seconds. Delay
timing starts when gas valve is energized.
Delay Off: Field-adjustable, 60, 100, 140 or 180 sec-
onds. Delay timing starts when gas valve is de-
energized.
Cool Speed:
Delay On: Field Adjustable, 4 or 30 seconds.
Delay Off: Fixed, 30 seconds.
Timing Tolerance: Larger of ±5% or ±2 seconds.
Post Purge Timing:
5 seconds.
Environmental Ratings:
Temperature: -40°F (-40°C) to +175°F (+79°C).
Humidity: 5 to 95 percent, noncondensing.
Approvals:
Underwriters Laboratories Inc. File No.: MP466.
Canadian Standards Association File No.: LR95329.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings and specifications given in the
instructions and on the product to make sure the
product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before wiring to prevent
electrical shock or equipment damage. More than
one disconnection can be required.
®
69-0644-1


ST9120U 데이터시트, 핀배열, 회로
ST9120U UNIVERSAL ELECTRONIC FAN TIMERS
Location and Mounting
Mount the ST9120U Electronic Fan Timer in the appliance
wiring compartment using the four provided No. 6 self-
tapping screws.
Wiring
Make sure that all wiring complies with local codes and
ordinances. Disconnect power before making wiring
connections. Refer to Figs. 1, 2, 3 and 4 for standard
wiring connections. Refer to Figs. 5 and 6 for internal
schematics. Refer to Fig. 7 for schematic of provided
ST9101 wiring adapter.
Setting Adjustable Heat Fan DIP Switches
Set the heat fan-on delay and cool fan-on delay DIP
switches as shown in Fig. 8. The heat-on delay time starts
when the main gas valve is energized at the start of a
thermostat call for heat; the heat-off delay time starts
when the main gas valve is de-energized at the end of a
thermostat call for heat. The cool fan-on delay time starts
when the compressor is energized at the start of a
thermostat call for cool.
ST9120 to ST9120U Wiring Conversion
Instructions
1. Turn off power to appliance. Carefully remove each
wire and connect directly to the corresponding loca-
tion on the new ST9120U control board. Be careful
to directly connect to the new terminal with the
same labeled identity or label each wire prior to
removing from the original board. If original thermo-
stat connection was a quick connect, cut off quick
connect, strip wire and insert into terminal block.
2. Identify the model number of the board being
replaced and set the dip switches based on Table 2.
ST9101 to ST9120U Wiring Conversion
Instructions
1. Turn off power to appliance and carefully remove
each wire and connect directly to the new ST9120U
control board before removing the existing control.
Use Table 1 to determine the proper ST9120U ter-
minal for each corresponding ST9101 connection.
board. Be careful to directly connect to the new ter-
minal or label each wire prior to removal from origi-
nal board.
Table 1. ST9101 to ST9120U Wiring Conversions
Terminal
Terminal
ST9101
ST9120U
heat
cool
heat
cool
SS
M1 Unused Motor Leads
M2 Unused Motor Leads
N Neutral 1
N Neutral 2
ACC
* for systems with one on fan
speed (see note below)
X X sec
C C xfmr
thermostat terminals
RR
YY
CC
WW
GG
* ACC terminal is used in ST9101 systems, which use the
same fan speed for both heating and cooling. In order to
use the ST9120 to replace ST9101 devices in this type
of system, the fan connection that originally was con-
nected to ACC on the ST9101 needs to be connected to
both heat and cool connections on the ST9120U.
2. Unplug the 9-pin connector and plug existing wiring
harness directly into the 9-pin connector found on
the ST9101 wiring adapter.
3. Plug the 6-pin connector found on the ST9101 wir-
ing adapter directly to the open 6-pin connector on
the new ST9120U control board.
4. Take the two remaining white wires on the ST9101
wiring adapter and connect to Neutral quick connect
terminals 3 and 4 on the ST9120U
5. Take the black wire on the ST9101 wiring adapter
and connect to the S1 quick connect terminal on the
ST9120U
6. Take the blue wire on the ST9101 wiring adapter
and connect to the D1 quick connect terminal on the
ST9120U
7. Identify the model number of the board being
replaced and set the dip switches based on Table 2.
69-0644—1
2




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ST9120U

Universal Electronic Fan Timers - Honeywell