T500 Series Non Programmable Thermostats Product/Technical Bulletin Tstat_non_programmable Tstat

User Manual: tstat_non_programmable

Open the PDF directly: View PDF PDF.
Page Count: 20

FANs 216, 1628.3
Product/Technical Bulletin T500
Issue Date 0899
© 1999 Johnson Controls, Inc. 1
Part No. 24-8341-19, Rev. C www.johnsoncontrols.com
Code No. LIT-216178
T500 Series Non-Programmable Thermostats
T500 Series Thermostats provide an economical
control solution for single-stage, multi-stage, or heat
pump systems. Two temperature settings can be
selected, as well as heat, cool, automatic
changeover, and off modes.
Thermostats are available in the following types:
T500HCN-1 (1 heat/1 cool), T500HPN-1 (heat pump,
3 heat, 2 cool), T500MSN-1 (2 heat/2 cool). Each
thermostat is packaged with the necessary mounting
hardware, and installation is simple and fast for
reduced cost.
Figure 1: T500 Series Non-Programmable
Thermostats
Features and Benefits
!
!!
!Low-Profile Design Compliments any decor
!
!!
!No Batteries Required Retains programmed setpoints upon loss of
power
!
!!
!Lockable Access Cover and
Keypad Lockout
Prevents unauthorized changes
!
!!
!Full Function Liquid Crystal
Display (LCD)
Makes controls easy to read, easy to use
!
!!
!Fuzzy Logic Control Optimizes control performance
2 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Introduction
The T500 thermostats use an adaptive control
routine, based on fuzzy logic, to determine the
heating or cooling load of the controlled space.
The routine calculates load by evaluating recent
room conditions, and room reactions to heating and
cooling. This load is used to determine the cycle rate
of the equipment, giving optimal control of the space.
114.3
(4-1/2)
101.6
(4)
22.2
(7/8)
Dmnsn
Figure 2: T500 Dimensions, mm (in.)
Supplies Needed
• drill
• 4.7 mm (3/16 in.) drill bit
• 3 mm (1/8 in.) flat-blade screwdriver
• hammer
• marking pencil
• wire stripper
Location Considerations
Locate T500 thermostats as follows:
• on a partitioning interior wall, and approximately
1.5 m (5 ft) above the floor in a location of
average temperature
• away from direct sunlight or radiant heat, outside
walls or behind doors, air discharge grills,
stairwells, or outside doors
• away from steam or water pipes, warm air
stacks, unheated/uncooled areas, or sources of
electrical interference
!
CAUTION: Shock Hazard.
Disconnect power supply
before wiring connections are
made to prevent electrical
shock or possible damage to
the equipment.
Installation and Wiring
Note: When replacing an existing thermostat,
remove and use wire tags to identify terminal
designations.
To install and wire the thermostat:
1. Lift the thermostat cover and insert a small coin
into the slot located in the bottom center of the
thermostat case and twist 1/4 turn. Grasp the
base from the bottom two corners and separate
from the thermostat. (See Figure 3.)
2. Swing the thermostat out from the bottom, and
lift up and out of the base. Place the rectangular
opening in the base over the equipment control
wires protruding from the wall and, using the
base as a template, mark the location of the two
mounting holes. No leveling is required.
3. Use the supplied anchors and screws for
mounting on drywall or plaster. Drill two 4.7 mm
(3/16 in.) holes at the marked locations, and tap
nylon anchors flush to wall surface and fasten.
(See Figure 4.)
4. Connect the wires from the existing system to
the thermostat terminals according to the wiring
designations in Table 4, Table 5, or Table 6.
Push extra wire back into the wall. Wires must
be flush to the plastic base. Plug hole with a
fireproof material to prevent drafts from affecting
the ambient temperature readings.
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 3
!
CAUTION: Equipment Damage Hazard.
Before applying power, make
all wiring connections and
check the connections.
Short-circuited or improperly
connected wires may result in
permanent damage to the
unit.
Figure 3: Separating the T500 from the Base
Mount
Figure 4: Mounting the Base
4 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Installing the Thermostat Cover Lock
If desired, insert the plastic lock piece into the
bottom of the mounted base. The ends of the lock
piece should fit snugly under the lock pins extending
from the bottom of the mounted base. The tab in the
middle of the lock piece should extend downward
from the mounted base. (See Figure 5.)
To release the lock, press the lock piece up and into
the base while gently prying open the thermostat’s
cover at the same time. Use caution to avoid
cracking the thermostat base or cover.
Thermostat
Base
Plastic Lock Pin
Snap
plastic lock
into place.
Figure 5: Installing the Thermostat Lock
Reattaching the Thermostat and Cover
to the Installed Base
1. Position the thermostat inside the cover and
attach on the hinged tabs located at the top of
the base.
2. Swing the thermostat and cover down, and press
on the bottom center edge until they snap in
place. (See Figure 6.)
Hinged
Tab s
Figure 6: Installing the T500 Thermostat
5 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
DIP Switch Selections
!
CAUTION: Equipment Damage Hazard.
Before selecting a minimum
on/off time, ensure the
equipment can tolerate the
following maximum hourly cycle
rates: 7.5 cycles per hour when
using 4-minute on/off, or
15 cycles per hour when using
2-minute on/off.
Table 1: T500HCN-1 DIP Switch Selections
DIP Switch Switch
Selection
Description
1On Allows 2-minute minimum on/off time for heating or cooling equipment.
Off Allows 4-minute minimum on/off time for heating or cooling equipment.
2On Locks the keyboard, disabling buttons to prevent tampering.
(Only the Outdoor and ∨
∨∨
∨ and ∧
∧∧
∧ buttons will function. See Setting the
Thermostat, Changing Settings While the Keyboard is Locked and
Temporary Override While the Keyboard is Locked in this bulletin.)
Off Unlocks the keyboard.
3On In heating mode, allows the fan to delay with the plenum switch with a call
for heat. However, in cooling mode, allows the fan to operate immediately
with a call for cooling.
Off In heating or cooling mode, allows the fan to operate immediately with a
call for heat or cooling.
6 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Table 2: T500HPN-1 DIP Switch Selections
DIP Switch Switch
Selection
Description
1On Compressor/Auxiliary Interlocked: Turns off the compressor when the auxiliary
heat is on. The compressor will remain off for two minutes after the auxiliary
heat is turned off to ensure that the heat pump coil has cooled.
Off Compressor/Auxiliary Normal: Allows the compressor and auxiliary heat to be
on simultaneously.
2Not used Not used. Switch should remain in the off position.
3On Allows 2-minute minimum on/off time for heating or cooling equipment.
Off Allows 4-minute minimum on/off time for heating or cooling equipment.
4On Locks the keyboard, disabling buttons to prevent tampering.
(Only the Outdoor and ∨
∨∨
∨ and ∧
∧∧
∧ buttons will function. See Setting the
Thermostat, Changing Settings While the Keyboard is Locked, and Temporary
Override While the Keyboard is Locked in this bulletin.)
Off Unlocks the keyboard.
5On Minimizes the use of auxiliary heat by disabling the auxiliary heat when the
room temperature is within 0.5° of the setpoint and not allowing a forced “On”
of the equipment.
Off Allows a forced “On” of the equipment by allowing the user to raise the setpoint
over 2° above the room temperature.
6On Allows multi-stage heating or cooling.
Off Allows single-stage heating or cooling.
7LED 1 icon
off/on
(See Table 7.)
Optional selection: LCD icon comes on with LED 1.
8LED 2 icon
off/on
(See Table 7.)
Optional selection: LCD icon comes on with LED 2.
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 7
Table 3: T500MSN-1 DIP Switch Selections
DIP Switch Switch
Selection
Description
1On Allows 2-minute minimum on/off time for heating or cooling equipment.
Off Allows 4-minute minimum on/off time for heating or cooling equipment.
2On Locks the keyboard, disabling buttons to prevent tampering.
(Only the Outdoor and ∨
∨∨
∨ and ∧
∧∧
∧ buttons will function. See Setting the
Thermostat, Changing Settings While the Keyboard is Locked, and
Temporary Override While the Keyboard is Locked in this bulletin.)
Off Unlocks the keyboard.
3On In heating mode, allows the fan to delay with the plenum switch with a call for
heat. However, in cooling mode, allows the fan to operate immediately with a
call for cooling.
Off In heating mode or cooling mode, allows the fan to operate immediately with
a call for heat or cooling.
4On Allows multi-stage heating or cooling.
Off Allows single-stage heating or cooling.
5LED 1 icon off/on
(See Table 7.)
Optional selection: LCD icon comes on with LED 1.
6LED 2 icon off/on
(See Table 7.)
Optional selection: LCD icon comes on with LED 2.
8 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Keyboard LockedKeyboard Unlocked
ON
1
32
Fan Immediate
with Call for Heat
Heat/Cool: 4 Minute
Minimum On/Off
Heat/Cool: 2 Minute
Minimum On/Off
Fan On with Plenum
Temperature Switch
Figure 7: T500HCN-1 Factory-Set DIP Switch
Settings (All Off)
CLK1
CLK2
RS2
RS1
W1
Y1
G
R
24V
24V(c)
Heating
Cooling
Fan
Common
Hcn-1wire
RS+V
24VAC
Figure 8: T500HCN-1 Wiring Configuration
Table 4: T500HCN-1 Output Terminal
Designations
Terminal Function
W1 Energizes on call for heating
Y1 Energizes on call for cooling
GEnergizes fan on call for heating or
cooling or by pressing the Fan button
RIndependent switching voltage
24V 24 VAC from equipment transformer
24V(c) 24 VAC (common) from equipment
transformer
CLK1
CLK2
Connections for remote clock/timer for
alternate setpoints
RS2
RS1
RS+V
Connections for outdoor air temperature
or indoor remote sensors; refer to
instructions included with sensors
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 9
Not Used
Single Stage
LED 1 Icon Off
LED 2 Icon Off
Heat/Cool: 4 Minute
(Minimum On)
Keyboard Unlocked
ON
1
3
2
456
Heat/Cool: 2 Minute
(Minimum On)
Keyboard Locked
78
LED 1 Icon
(Filter)
LED 2 Icon
(Wrench/Fault)
Not Used
Multi-stage
Compressor/Auxiliary
Interlocked
Compressor/Auxiliary
Normal
Economy Comfort
Figure 9: T500HPN-1 Factory-Set DIP Switch
Settings
LED1
LED2
CLK1
CLK2
RS2
RS1
RS+V
Y2
W1
Y1
1st Stage Heating
1st Stage Cooling
Fan
Cool Reversing Valve
Heat Reversing Valve
Hpn-1wire
2nd Stage Heat Pump
Common
24VAC
Figure 10: T500HPN-1 Wiring Configuration
Table 5: T500HPN-1 Output Terminal
Designations
Terminal Function
Y2 Energizes compressor No. 2 on a call
for second-stage heating or cooling
W1 Energizes auxiliary stage heat as
third-stage heating or emergency heat
Y1 Energizes compressor No. 1 on a call
for second-stage heating or cooling
GEnergizes fan on a call for heating or
cooling or by pressing Fan button
RIndependent switching voltage
24V 24 VAC from equipment transformer
24V(c) 24 VAC (common) from equipment
transformer
LED 1
LED 2
Input connection that energizes LED 1
or LED 2 from remote status device
(See Figure 10 and Table 7.)
CLK1
CLK2
Connections for remote clock/timer for
alternate setpoints
RS2
RS1
RS+V
Connections for outdoor air
temperature or indoor remote sensors;
refer to instructions included with
sensors
OEnergizes reversing valve in the
cooling mode
BEnergizes reversing valve in the
heating mode
10 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Heat/Cool: 2 Minute
(Minimum On/Off)
Keyboard Unlocked
Fan immediate with
a call for heat
Single Stage
LED 1 Icon Off
LED 2 Icon Off
Fan on with plenum
switch
Multi-stage
LED 1 Icon
(Filter)
LED 2 Icon
(Wrench/Fault)
ON
1
32
4
5
6
Keyboard Locked
Heat/Cool: 4 Minute
(Minimum On/Off)
Figure 11: T500MSN-1 Factory-Set DIP Switch
Settings
LED1
LED2
CLK1
CLK2
RS2
RS1
2nd Stage Cooling
1st Stage Heating
1st Stage Cooling
Fan
24V
R
Y2
Common
MSN-1Wire
RS+V
24VAC
Figure 12: T500MSN-1 Wiring Configuration
Table 6: T500MSN-1 Output Terminal
Designations
Terminal Function
W2 Energizes on a call for second-stage
heat
Y2 Energizes on a call for second-stage
cooling
W1 Energizes on a call for first-stage
heat
Y1 Energizes on a call for first-stage
cooling
GEnergizes fan on call for heating or
cooling or by pressing the Fan button
RIndependent switching voltage
24V 24 VAC from equipment transformer
24V(c) 24 VAC (common) from equipment
transformer
LED 1
LED 2
Input connection that energizes
LED 1 or LED 2 from remote status
device (See Figure 12 and Table 7.)
CLK1
CLK2
Connections for remote clock/timer
for alternate setpoints
RS2
RS1
RS+V
Connection for outdoor temperature
sensor and/or indoor remote sensor
option; refer to instructions included
with sensors
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 11
Wiring Diagrams
1st Stage
Compressor
1st Stage
Heat Fan
W1 Y1 G 24V(c)
R24V
T1 T2
RS+V RS1 RS2
Remote
Sensor
(if used)
Thermostat
Equipment
Electronics
CLK1 CLK2
Remote
Clock/Timer
(if used)
If the transformer (T2) is to power all of the loads R and
24V must be connected by inserting jumper J 1 located
above the relays. If a separate 24V transformer (T1) is to be
used, remove the jumper J 1 to disconnect R and 24V(c).
P
P
Optional
Hcn-1
JP1
Figure 13: T500HCN-1 Wiring Schematic
12 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Remote
Clock/Timer
(if used)
Remote
Sensor
(if used)
Thermostat
Equipment
T1 T2 Field Contact Switches
2nd Stage
Compressor
Electronics
Y1 Y2 G O B RCLK1 CLK2
24V(c) RS+V RS1 RS2
LED2
24V
Reverse
Valve
Heating
Reverse
Valve
Cooling
Fan
1st Stage
Compressor
1st Stage
Auxiliary
LED1W1
HPN-1
Optional
If the transformer (T2) is to power all of the loads
R and 24V must be connected by inserting jumper J 1
located above the relays. If a separate 24V transformer
(T1) is to be used remove the jumper J 1 to disconnect R and 24V(c).
P
P
J1P
Figure 14: T500HPN-1 Wiring Schematic
Remote
Clock/Timer
(if used)
Remote
Sensor
(if used)
Thermostat
Equipment
T1 T2 Field Contact Switches
2nd Stage
Cool
Electronics
Y1 Y2 GR
CLK1
CLK2
24V(c) RS+V
RS1
RS2
LED2
24V
Fan
2nd Stage
Heat
LED1
W2
W1
1st Stage
Cool
Optional
If the transformer (T2) is to power all of the loads R and 24V
must be connected by inserting jumper J 1 located above
the relays. If a separate 24V transformer (T1) is to
be used, remove the jumper J 1 to disconnect R and 24V(c).
P
P
JP1
1st Stage
Heat
Figure 15: T500MSN-1 Wiring Schematic
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 13
Commissioning
The thermostat normally displays room temperature
and mode of operation (whether cooling or
heating is currently on).
Table 7: LED Indicators (T500MSN-1,
T500HPN-1 only)
LED Position Function
Left Indicates filter needs
changing. Controlled by
external switch on LED 1.
Display of the filter symbol can
be enabled; see Table 2 and
Table 3.
Center (T500HPN-1 only) Indicates
when highest stage heat is
activated. Internally controlled.
Right Indicates a fault. Controlled by
external switch on LED 2.
Display of the wrench symbol
can be enabled; see Table 2
and Table 3.
Thermostat Operation Overview
Outdoor
Day/Night
Mode
Fan
LEDs (T500HPN, T500MSN only) indicate
system activity or problems (See Table 1).
Used to display outdoor
temperature (optional).
Used to alternate between day
and night setpoints.
Used to run fan
continuously.
Used to select heating or
cooling mode of operation
Used to increase/decrease values
or change between Degree C or F.
Face
Figure 16: T500 Non-Programmable Pushbuttons
14 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Mode
Repeated pressing of the Mode button allows
selection from four modes of operation (five for the
T500HPN-1/Heat Pump model):
• When the
Snowflake symbol and the word
COOL are displayed, the thermostat is in the
cooling mode. When the thermostat is calling for
cooling, the snowflake will flash.
• When the
Flame symbol and the word HEAT
are displayed, the thermostat is in the heating
mode. When the thermostat is calling for
heating, the flame will flash.
• When the
Flame symbol and E Ht
(emergency heat) are displayed, the thermostat
will control using the emergency heat with the
compressor locked out. (T500HPN-1/Heat Pump
only.)
• When the
Snowflake and the Flame
symbols and word AUTO are displayed, the
thermostat will automatically change over
between heating and cooling.
Note: The thermostat never allows less than a 1°C
(2°F) difference between cooling and heating
setpoints.
• When
OFF is displayed, the equipment will not
operate.
Note: Use caution when using the OFF mode in
extremely cold weather.
Celsius/Fahrenheit
Press the ∨
∨∨
∨ and ∧
∧∧
∧ buttons simultaneously to
alternate between Celsius and Fahrenheit display.
Fan
If continuous fan is not selected, the fan will operate
automatically and the fan symbol will be off. To
select continuous fan operation, press the Fan
button. The Fan symbol will be displayed.
(See Figure 17.)
Outdoor
Day/Night
Mode
Fan
75
Press to
select
continuous
fan operation
Figure 17: Selecting Continuous Fan Operation
Outdoor Button
When an outdoor temperature sensor (order
separately) is connected to the T500 thermostat, you
can display the current outdoor temperature by
pressing the Outdoor button. If the sensor option is
not connected, the thermostat will display “— —”.
See the Ordering Information section.
Day/Night Button
When the T500 thermostat is first installed or after a
power loss, the display will show the Day symbol ,
the temperature, and the mode. To select an
alternate or Night temperature:
• Press the
Day/Night button, or
• Install a time clock using the CLK1 and CLK2
terminals, to activate the thermostat’s night
mode. (The T500 Thermostat will remember the
night mode setpoint.) See Options: Clock
Terminals CLK1 - CLK2.
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 15
Setting the Thermostat
1. Press the
Day/Night button until is displayed.
2. Set the mode to cooling .
3. Select the desired temperature for equipment to
maintain while in the cooling mode using the
∨
∨∨
∨ or ∧
∧∧
∧ buttons. The cooling setpoint range is
16 to 40°C (60 to 108°F).
4. Set the mode to heat .
5. Select the desired temperature for equipment to
maintain while in the heating mode using the
∨
∨∨
∨ or ∧
∧∧
∧ buttons. The heating setpoint range is
5 to 30°C (38 to 88°F).
6. Press the
Day/Night button until is displayed
and repeat Steps 2 through 5.
Changing Settings While the Keyboard
is Locked
To change settings while the DIP switch is set to lock
the keyboard:
1. Open the thermostat and switch the DIP switch
to unlock the keyboard. (See Table 1, Table 2,
and Table 3). Close the thermostat.
2. Make the necessary changes.
3. Open the thermostat and switch the DIP switch
to lock the keyboard again. Close the
thermostat.
Temporary Override While the Keyboard
is Locked
To alter the setpoint while the DIP switch is set to
lock the keyboard, press the ∨
∨∨
∨ or ∧
∧∧
∧ buttons to alter
the setpoint ± 3°C or ± 6°F. This will temporarily
change the setting for 1 hour. If the setpoint is
altered while in night mode, the thermostat will
change to the day mode setting.
Sensor Calibration (Fan/10 Seconds)
The internal and remote sensors can be calibrated to
eliminate wire resistance errors or to match another
reference.
1. Press and hold the Fan button for 10 seconds.
2. Adjust the temperature with the ∨
∨∨
∨ or ∧
∧∧
∧ buttons.
The temperature is shown on the lower display
to the hundredths place. For example, 72°F on
the large display is shown as 72 13.
Options
Clock Terminals CLK1 - CLK2
The T500 thermostat has a contact closure for a
clock/timer to allow the use of alternate heating and
cooling setpoints.
When the contact is open, the day symbol is
displayed and the thermostat controls to the day
setpoint. When the contact is closed, the Night
symbol is displayed and the thermostat controls to
the night setpoint.
Pressing the Day/Night button when the thermostat
is in night mode will switch the thermostat to the day
mode, even if a clock/timer is used. The CLK
contacts on the thermostat are parallel with the
thermostat contacts and will change to the next
command given by the clock. Therefore, if the
thermostat is in night mode (contacts closed) and the
thermostat is switched to the day mode (contacts
open), then at the next clock control time the
thermostat will stay in the day mode.
Remote Sensor
The indoor remote sensor allows the T500 to be
mounted away from the controlled space, and allows
use of multiple sensors for temperature averaging.
Order separately. See Table 10: Optional
Accessories.
Outdoor Sensor
Order separately. See Table 10: Optional
Accessories.
Power Failures
In the event of a power failure, the thermostat will
retain setpoints. When power is restored, it will
continue normal operation and will not require
resetting unless power was lost when the thermostat
was in the night mode, in which case it will return to
the day mode.
16 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Fuzzy Logic Control
Over time, the T500 learns how long it takes the
system to meet the load. If the system can change
the room temperature quickly, the T500 allows the
thermostat to drift further from setpoint before
starting the equipment. If the system takes a longer
period of time to change the room temperature, it will
not allow the temperature to drift as far from setpoint.
The T500 also takes into account the minimum
On/Off times.
The 2-minute On/Off time allows the equipment to
cycle more frequently at smaller differentials than the
4-minute On/Off time.
For multi-stage applications, the T500 does not bring
on the next stage of cooling or heating if it knows
that the system can change the temperature by
6 degrees in 1 hour, or 1 degree in 10 minutes. To
verify thermostat operation, force the next stage on
by changing the setpoint by more than 2 degrees.
Verification
To verify proper functioning of the thermostat:
1. Press the
Mode button to select the heat or cool
mode. (See Figure 18.)
2. Press the
∨
∨∨
∨ or ∧
∧∧
∧ buttons to raise the setpoint
above or below the current ambient temperature.
The thermostat should call for either heating or
cooling, and should activate the fan.
If the equipment does not come on, proceed to the
Troubleshooting section.
Note: If you are using the T500HPN-1 and DIP
switch number 5 is in the “on” position, the
auxiliary heat will not come on when the
setpoint is raised more than two degrees
above room temperature (See Table 2.)
Move the switch to the “off” position to force
on the auxiliary heat when the setpoint is
raised.
Outdoor
Day/Night
Mode
Fan
75
Press to
select
mode (heat
or cool).
Npiface3
Figure 18: Verifying Proper Operation
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 17
Troubleshooting
Table 8: Troubleshooting
Symptom Possible Cause Corrective Action
No display/faint display ... Supply voltage incorrect Use a voltmeter to check the voltage between the 24V and
24V(c) terminals. Voltage should be between 20-30 VAC. If
voltage is less than 20 VAC, disconnect the thermostat and
check the voltage between 24V and the other system wires;
see possible causes below. If voltage is greater than
30 VAC, troubleshoot the power source and replace the
thermostat.
System transformer weak
or overloaded
Check and/or replace with a suitable 24V transformer.
Thermostat damaged
because system voltage
was greater than 30 VAC
Replace with new thermostat, and ensure new thermostat is
isolated from the system using suitable relays and a
transformer of the proper rating.
Keyboard inoperative ... Keyboard locked Switch the keyboard DIP switch to the unlocked position.
Thermostat will not call for
heat ...
Short cycle delay still in
progress
Wait 4 minutes, equipment short cycle protection in
progress.
Thermostat setpoint is
satisfied
Raise the heating setpoint using the ∧
∧∧
∧ button.
T500HPN-1 ONLY: If DIP
switch number 5 is in the
“on” position, the auxiliary
heat will not come on when
the setpoint is raised more
than two degrees above
room temperature.
(See Table 2.)
Move the switch to the “off” position to force on the auxiliary
heat when the setpoint is raised.
Thermostat will not call for
cooling ...
Short cycle delay still in
progress
Wait 4 minutes, equipment short cycle protection in
progress.
Thermostat setpoint is
satisfied
Lower the cooling setpoint using the ∨
∨∨
∨ button.
Fan does not turn on with
the system ...
Fan failure Place a jumper between Terminals R and G. Fan should
come on. If it does not, troubleshoot the fan system. If fan
does come on, replace the thermostat.
“AC” is displayed on the
LCD ...
20-30 VAC absent from
R and C terminals
Using a voltmeter, measure voltage between the 24V and
24V(c) terminals. If the reading is less than 20 VAC, check
system transformer. If the voltage is between 20-30 VAC,
replace the thermostat.
* The Non-Programmable T500 Thermostats do not have a
supercap back up. The “AC” on the LCD will therefore
never flash.
LCD shows missing or
extra segments ...
LCD failure Replace the unit.
18 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Ordering information
Table 9: Ordering Information
Item Product Code Number
Non-programmable Thermostat, Single-stage, 1 Heat, 1 Cool T500HCN-1
Non-programmable Thermostat, Multi-stage, 2 Heat, 2 Cool T500MSN-1
Non-programmable Thermostat, Heat Pump, 2 Compressors with Auxiliary Heat T500HPN-1
Accessories
Table 10: Optional Accessories (including mounting hardware)
Item Product Code Number
Remote Indoor Air Temperature Communication Module with Integral Sensor SEN-500-1
Outdoor Air Temperature Communication Module with Outdoor Air Sensor SEN-500-2
Outdoor Air Temperature Communication Module with Duct Mount Sensor SEN-500-3
Replacement and Repair Parts
The SEN-500 series of products allows for easy
replacement of the sensor. For a replacement
sensor, contact the nearest Johnson Controls
branch office or wholesale distributor and order using
the information from Table 10: Optional Accessories
and Table 11: Replacement Parts.
Table 11: Replacement Parts
Item Product Code Number
Replacement Outdoor Air Temperature Communication Module SEN-500-603
Replacement Outdoor Air Temperature Sensor (includes mounting hardware) SEN-500-604
Replacement Duct Mount Temperature Sensor (includes mounting hardware) SEN-500-605
Table 12: Repair Parts
Item Product Code Number
3 in. Sensor Probe (use with outdoor air sensor) SEN-500-601
8 in. Sensor Probe (use with duct mount sensor) SEN-500-602
T500 Series Non-Programmable Thermostats Product/Technical Bulletin 19
Notes
20 T500 Series Non-Programmable Thermostats Product/Technical Bulletin
Specifications
Product T500HCN-1, T500MSN-1, T500HPN-1
Power Requirements 20-30 VAC, 50/60 Hz, 24 VAC nominal
Relay Contact Rating Maximum Inductive: 1 ampere with surges to 3 amperes, 24 VAC Class 2
Maximum Resistive: 1 ampere, 24 VDC (2000 VA Maximum for all outputs)
Minimum: 10 uA for 24 VAC circuit; 10 mA for 24 VDC circuit
Recommended Wire Size 24-18 gauge
Thermostat Measurement
Range
0 to 48°C (28 to 124°F)
Outdoor Air Temperature
Indication Range
-48 to 48°C (-50 to 124°F)
Control Range Heating: 5 to 30°C in 1° steps; 38 to 88°F in 1° steps
Cooling: 16 to 40°C in 1° steps; 60 to 108°F in 1° steps
Display Resolution 1C or 1F
Minimum Deadband 1°C or 2°F between heating and cooling
°C/°F Conversion 20°C = 68°F, each Celsius degree above or below 20°C = 2°F
Ambient Operating
Conditions
0 to 55°C (32 to 131°F), 5 to 90% RH non-condensing
Ambient Storage
Conditions
-34 to 55°C (-30 to 131°F)
Dimensions (H x W x D) 114.3 x 101.6 x 22.2 mm (4 1/2 x 4 x 7/8 in.)
Shipping Weight 0.171 kg (0.37 lb)
FCC Compliance This equipment has been tested and found to comply with the limits for a Class A digital
device and verified to Class B pursuant to Part 15 of FCC Rules. These limits are designed
to provide reasonable protection against harmful interference when this equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his/her own expense.
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication
or misuse of its products
This device complies with Class A Part 15 of the FCC rules. It was also verified to Class B. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including interference that may cause undesired operation.
This Class A digital apparatus meets all of the requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil
numerique de la Classe A respecte toutes les exigences du Reglement sur le materiel brouilleur du Canada.
Controls Group
507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53201 www.johnsoncontrols.com

Navigation menu