Zhongjin STN731RF Thermostat Instruction Manual
- May 15, 2024
- Zhongjin
Table of Contents
Installation Manual
STN731RF Thermostat
Thermostat Application Guide
Description|
---|---
Gas or Oil Heat| Yes
Electric Furnace| Yes
Heat Pump (No Aux. or Emergency Heat)| Yes
Heat Pump (With Electric Aux.)| Yes
Heat Pump (With Gas Aux.)| No
Multi-Stage Systems| No
Heat Only Systems – Floor or Wall Furnace| Yes
Cool Only Systems| Yes
High and Low Fan Speed| Yes
Millivolt| No
Emergency Heat| No
Conventional Single Stage Furnace| Yes
Geothermal| Yes
Power Type
Battery Powe
Hardwire (Common Wire)
Hardwire (Common Wire) with
Battery Backup
Atrained, experienced technician must install this product.
carefully read these instructions. You could damage his productor causea
hazardous condition if you fail to follow these instructions.
Installation Tips
Wall Locations
The thermostat should be installed approximately 4 to 5 feet above the floor.
Select an area with average temperature and good air circulation.
Installation Tip
Pickan nstallaton locationthat is easy for the user to acces. The temperature
of the location should be epresentative of the building.
Do not install thermostat in locations:
- Close to hot or cold air ducts
- That are in direct sunlight
- With an outside wall behind the thermostat
- In areas that do not require conditioning
- Where there are dead spots or drafts (in corners or behind doors)
- Where there might be concealed chimneys or pipes
Subbase Installation
- Horizontal Mount
- Vertical Mount
For vertical mount put one screw on the top and one screw on the bottom.
For horizontal mount put one screw on the left and one screw on the right.
Installation Tip:
Electrical Hazard
Failure to disconnect the power before beginning to install this product can
cause electrical shock or equipment damage.
Mercury Notice
All of our products are mercury free.
However, if the product you are replacing contains mercury, dispose of it
properly. Your local waste management authority can give you instructions on
recycling and proper disposal.
Mount Thermostat
Align the 4 tabs on the subbase with corresponding slots on the back of the
thermostat, then push gently until the thermostatsnapsin place. 
Battery Installation Battery
installation is optional is thermostat is hardwired (R and ¢ terminal
connected 1o 24V power)
Important:
High quality alkaline batteries are recommended.
Rechargeable batteries or low quality batteries do not guarantee a 1-year life
span.
Insert 2 AAA Alaline batteries (induded) High quality alkaline batteries are
recommended.
Thermostat Quick Reference
Getting to know your thermostat
I Occupied (mannd state) and unoccupied (unmanned state) switches :
- Connect the two OCs behind the thermostat and they are in the Occupied (manned state).
- Disconnect the two OCs behind the thermostat and they are in an unoccupied (unmanned state).
- In unoccupied (unmanned) state, the user cannot modify the operating temperature. HEAT is fixed at 60 ‘F (16 °C); COOL is fixed at 80 F(27 °C)
- LCD
- Fan Switch
- System Switch
- Setpoint Buttons
Wiring
- If you are replacing a thermostat, make note of the terminal connections on the thermostat that is being replaced. In some cases the wiring connections will not be color coded. For example, the red wire may not be connected to the R iterminal.
- Loosen the terminal block screws, Insert wires then retighten terminal block screws.
Installation Tip
Do not overtighten terminal block screws, as this can damage the terminal
block. A damaged terminal block can keep the thermostat from fitting onthe
subbase correctly or cause system operation issues.
Max Torque = 6in-lbs.
Terminal| 1 Heat 1 Cool Conventional System| 1 Heat 1 Cool Heat Pump System| 2
Heat 1 Cool Heat Pump System
---|---|---|---
R| Transformer power (cooling)| Transformer power (cooling)| Transformer power
(cooling)
C| Transformer common| Transformer common| Transformer common
B| Energized in heating| Heat pump changeover valve energized in cooling| Heat
pump changeover valve energized in heating
O| Energized in cooling| Heat pump changeover valve energized in cooling| Heat
pump changeover valve energized incooling
GL| Fan Relay, Low| Fan Relay, Low| Fan Relay, Low
GH| Fan Relay, High| Fan Relay, High| Fan Relay, High
W| First stage of heat| N/A| Second stage of heat
Y| First stage of cool| First stage of heat & cool| First stage of heat & cool
Wiring
This thermostat is shipped from the factory to operate a conventional
heating and cooling system. This thermostat will also operate a heat pump
system. See the “heat pump” configuration step on page 10 of this manual to
configure the thermostat for heat pump applications.
Wiring Tips
Caution:
Electrical Hazard
Failure to disconnect the power before beginning to install this product can
cause electrical shock or equipment damage.
C Terminal
The C (common wire) terminal does not have to be connected when the thermostat
is powered by batteries.
Warning:
All components of the control system and the thermostat installation must
conform to Class Il circuits perthe NEC Code.
Wire Specifications
Use shielded or non-shielded 18-22 gauge thermostat wire.
Note
When connecting the Thermostat toa PTAC, refer to the PTAC manufacturer
instructions to enable remote thermostat operation.
Wiring Diagrams
Power supply
Jumper (not supplied) to connect GL and GH terminals.
Thermostat must be set to O and B to match the changeover valve, O is the cool
changeover valve, B is the heat changeover valve.
The Aux Heat Relay is energized as the second stage of heat.
Typical 1H/1CSystem:2 SpeedFan
Typical
1H/1C System: 1 Speed Fan
Typical
1H/1C Heat Pump System: 2 Speed Fan
Typical 2H/1C Heat Pump System: 2 Speed
Fan
Note:
Most PTAC systems support two speed fan operation. Ina single speed fan PTAC
system or conventional single speed fan system, a jumper should be installed
between GL and GH onthe thermostat.
Technician Setup
Fan OperationSetup
Electric: The thermostat operation jumper pin should be put in the ELEC
position. This setting allows the thermostat to operate the fan during a call
for heat. Most PTAC systems will require ELEC Fan Operation Setup.
Gas: For systems that control the fan during a Call for heat, put the
jumper pin into the GAS position.
Technician Setup Menu
- Set the thermostat system switch to OFF.
- To enter Tech Setup Menu,press and hold “+”and “-’together for 3 seconds.
- Use “+”and“-“to select desired setting for each option.
- Tap “+’and “-“together to move next option.
- To exit Tech Setup Menu,move system switch or wait for 15 seconds.
Tech Setup Steps
| LCD Will Show| Adjustment Options| Default
---|---|---|---
Room Temperature Calibration| This feature allows the installer to change the
calibration of the room temperature display. For example, if the thermostat
reads 70° and you would like it to read 72° then select +2.| | You can adjust
the room temperature display to read up to 4° above or below the factory
calibrated reading.|
Pair| Transmitter and receiver pair code| | Press and hold “+” for 3 seconds
until “LE” is flashed. Then release|
Forc| Select for Fahrenheit temperature read out select C for Celsius read
out.| | F for Fahrenheit C for Celsius|
Compressor Short Cycle Delay| The compressor short cycle delay protects the
compressor from short cycling. This feature will not allow the compressor to
be turned on for 5 minutes after it was last turned off.| | Selecting ON will
not allow the compressor to be turned on for 5 minutes after the last time the
compressor was switched off. Select OFF to remove this delay.|
Change Over Valve Selection| Select 0 for a changeover valve that energizes in
cooling. Select b for a change over valve that energizes in heating.| | 0 for
cooling changeover valve.b for heating changeover valve.|
Heat Pump| When turned on the thermostat will operate a heat pump.Y will be
the first stage of heat & cool, W will be the second stage of heat.| | OFF
configures the thermostat for non heat pump systems. ON configures the
thermostat for heat pump systems.|
Swing Setting
- Set the thermostat system switch to the desired position (COOL or HEAT).
- Press and hold “+’and “-“together for 3 seconds.
- Use “+”and “-” to adjust desired swing setting (The display reads in tenths of a degree.)
- To exit, move system switch or wait for 10 seconds.
Swing Setting| LCD Wil Show| |
---|---|---|---
Cooling Swing (SYSTEM COOL)| The swing setting, often called*cycle rate”,
“differential” or “anticipation” is adjustable. A smaller swing setting will
cause more frequent cycles and a larger swing setting will cause fewer
cycles.| | The cooling swing setting is adjustable from 0.2’ to 2”. For
example: A swing setting of 0.5° will turn the cooling on at approximately
0.5° I above the setpoint and turn the cooling off at approximately 0.5° below
the setpoint.|
Heating Swing (SYSTEM HEAT)| The swing setting, often called“cycle rate”,
“differential or “anticipation” is adjustable. A smaller swing setting will
cause more frequent cucles and a larger swing setting will cause fewer cycles|
| The heating swing setting is adjustable from 0.2° to 2°. For example: A
swing setting of 0.5° will turn the heating on at approimately 0.5° I below
the setpoint and tum the heating off at approximately 0.5° above the
setpoint.|
Swing Setting
The second stage of Heat will turn on at 2x the swing setting. The second
stage will turn off when 1x the swing is reached. For example, if the swing
setting is 08″ for heating and the thermostat is set at 70″ F, the firs stage
will turn on at approximately 69.2″ F. The second stage will turn on at 68.4°F
and the first will turn off at 70.8°F.
RF Pairing
- Receiver: Use a slender object into the hole and keep it depressed (for approximately 5 seconds) until the red LED starts flashing.
- Transmitter: Turn the SYSTEM switch to OFF. Press and hold“+” and “-” together for 3 seconds to access the interface of room temperature calibration. Press and hold“+” and *-” together until“LE” is displayed on the LCD.Then press and hold “+” for 3 seconds , the transmitter will transmit the code signal. When the red LED on the receiver stops flashing, indicating that the code is successful
Specifications
Thermostat
The display range of temperature … 32°F to 99°F (1°C to 40°C)
The control range of temperature…. 60°F to 80°F (16°C to 27°C)
Load rating……………………….Lamp per terminal, 1.5 amp maximum all terminals combined
Swing (cycle rate or differential) …… Heating is adjustable from 0.2° to 2.0°
Cooling is adjustable from 0.2° to 2.0°
POWEP SOUICE 0……………….. LB tO 30 VAC, NEC Class II, 50/60 Hz for hardwire
Battery power from 2 AAA Alkaline batteries
Operating ambient …………………….. 32°F to +105°F (0°C to +41°C)
Operating humidity ……………………..90% non-condensing maximum
Dimensions of thermostat……………..120 x 98 x 283MM
Operating Frequency ……………… 915 MHZ
FCC Warning
This device complies with part 15 of the FCC Rules. O peration is subject
to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause
undesired operation.
Any Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates uses and
can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. H owever, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-|ncrease the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/ TV technician for help.
The device has been evaluated to meet general RF exposure requirement. The
device can be used in portable exposure condition without restriction
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>