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PDF ST9120U Data sheet ( Hoja de datos )
| Número de pieza | ST9120U | |
| Descripción | Universal Electronic Fan Timers | |
| Fabricantes | Honeywell | |
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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
1 page  
ST9120U UNIVERSAL ELECTRONIC FAN TIMERS
HUMIDIFIER
AIR CLEANER 3
INDUCER MOTOR
STARTING
CAP
LO
ML
MH
HI
2
CIRCULATING
FAN
FUSE
L1(H) TO 115/230 VAC
L2(N) POWER SUPPLY
115/230 VAC
TRANSFORMER
24 VAC
ROLL-OUT
SWITCH
LIMIT
CONTROL
SV9500 SMARTVALVE™
SYSTEM CONTROL
1 2 3 4 CXX
N
3 DI
NEUTRAL
1 2 HUM EAC N N CIR
BLWR
1
Z1
ST9120
Z2
PRESSURE
SWITCH
THERMOSTAT
WY G R
DELAY
12
OFF
SPEED
UP C Y
4
CG Y WR
COOLING
CONTACTOR
1 CONNECT ONLY IF CONTINUOUS SPEED IS AVAILABLE AND USED.
2 CONNECT ONLY IF CONTINUOUS SPEED IS NOT USED.
3 CONNECT IF EAC AND HUM TERMINALS ARE AVAILABLE AND USED.
24 VOLT
COMMON
24 VOLT
HOT
EFT
OUTPUT
24 VOLT
THERMOSTAT
OR PRESSURE
SWITCH
4 SOME MODELS USE MALE 1/4-INCH QUICK-CONNECTS INSTEAD OF SCREW TERMINALS FOR THERMOSTAT CONNECTIONS.
NOTE: = DENOTES STANDARD TERMINAL.
= DENOTES OPTIONAL TERMINAL.
DENOTES LOW VOLTAGE WIRING.
DENOTES LINE VOLTAGE WIRING.
M5603A
Fig. 2. Typical ST9120U wiring connections with SV9500/SV9501 SmartValve™ System Control.
5 69-0644—1
5 Page 
ST9120
3 DI
1 2 HUM EAC
1 23 4
C XX
N
NEUTRAL
N N CIR
BLWR
Z1
Z2
ST9120U UNIVERSAL ELECTRONIC FAN TIMERS
CHECKOUT
Operate the system through at least one complete
heating cycle and cooling cycle to make sure the system
operates properly. Troubleshoot by checking for
appropriate voltages at the ST9120U terminals controlling
the combustion blower and heat and cool speed
circulating fan. The ST9120U schematics show internal
switching to clarify operation and assist in
troubleshooting. See Figs. 5 and 6.
DELAY
123 4
OFF
SPEED
UP C Y
CG Y WR
DELAY ON DIP SWITCH (4)
DELAY OFF DIP SWITCHES (2 & 3)
COOL DELAY ON DIP SWITCH (1)
COOL ON DELAY
HEAT ON DELAY
1
4
SECONDS
1
30
SECONDS
123 4
60
SECONDS
4
30
SECONDS
HEAT OFF DELAY
23
23
23
23
60 100 140 180
SECONDS SECONDS SECONDS SECONDS
FAN DELAY ON/OFF DIP SWITCH SETTINGS
M11990
Fig. 8. Setting heat fan-on, heat fan-off and cool fan-
on delay DIP switches.
Table 4. ST9120U Operating Sequence.
Action
System Response
Thermostat calls for heat.
(Terminal W is energized.)
1. Combustion air blower is energized.
2. Air proving switch makes (air flow is established)
3. Ignition system is energized.
4. Gas valve opens and main burner lights.
5. Heat fan-on delay timing begins. When timing is complete,
circulating fan is energized at heat speed.
Thermostat ends call for heat.
(Terminal W is de-energized.)
1. Ignition system is de-energized and gas valve closes.
2. Combustion air blower is de-energized after postpurge timing.
3. Heat fan-off delay timing begins. When timing is complete, the
circulating fan is de-energized.
Thermostat begins call for cool.
(Terminals G and Y are energized.)
1. Cooling contactor is energized.
2. Circulating fan is energized at cool speed after cool fan-on delay
timing.
Thermostat ends call for cool.
(Terminals G and Y are de-energized.)
1. Cooling contactor is de-energized.
2. Circulating fan is de-energized after cool fan-off delay timing.
Thermostat begins call for fan.
(Terminal G is energized.)
1. Circulating fan is energized at heat speed two seconds after G
terminal is energized.
2. If a call for heat occurs, circulating fan continues to run at heat
speed.]
3. If a call for cool occurs, circulating fan switches to cool speed after
four-second delay.
Thermostat ends call for fan.
(Terminal G is de-energized.)
NOTE: Circulating fan can be switched off for several seconds during
the transition between fan speeds.
Circulating fan is de-energized.
11 69-0644—1
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ST9120U.PDF ] | |
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