N2 Thermostat Installation Guide

N2 Thermostat Installation Guide
TEC-N2 Series Thermostat
Introduction
Note: In this document, Building Automation System (BAS) is a generic
term that refers to the Metasys® Network (Network Control
Module [NCM] or N30 series), Companion™, and Facilitator™
supervisory systems. The specific system names are used when
referring to system specific applications.
Description
The TEC-N2 series includes two nonprogrammable models: multi stage
heat pump (HP32-N2) and multi stage gas/electric (GE22-N2). The applications include furnace, air conditioner, heat pump, and rooftop units.
The TEC-N2 incorporates fuzzy logic for precise control in a thermostat
type package.
All TEC-N2s have Metasys N2 communication capability. This communication allows the user to view and adjust parameters from a remote workstation. It also provides information, such as outside air temperature, to the
TEC-N2 units on the bus. The thermostat is easy to operate and normally
displays room temperature and mode of operation using cooling (j) or
heating (i) icons. When there is a call for cooling, the snowflake icon (j)
blinks. Likewise, on a call for heating, the flame icon (i) blinks. When the
temperature is satisfied, neither will blink. In the auto mode, both icons
(ji) display continuously when satisfied. Light-emitting diodes (LEDs)
on the top of both models use binary inputs (BIs) to indicate a clogged filter and external service. A unique temperature alarm (BI 2) indicates that
the zone temperature has not been satisfied in 45 minutes.
}
LEDs indicate system activity
or problems (see Table 3).
75
Used to select heating, cooling,
auto, off, or emergency heat
(E ht; available on HP32-N2
only) mode of operation.
Mode
Outdoor
Fan
Day/Night
<
<
Used to run fan
continuously.
Used to display outside
temperature (optional).
Used to alternate between
day and night setpoints.
Time occuppied mode when
keyboard locked.
Used to increase/decrease values
or change between °C or °F.
Figure 1: TEC-N2
1
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Table 1: Specifications
Product
HP32-N2
GE22-N2
Thermostat with N2 Bus, 3 Heat/2 Cool Heat Pump
Thermostat with N2 Bus, 2 Heat/2 Cool
Compatibility
GE22-N2
TEC1101-1 (Johnson Controls)
TEC1103-1 (Johnson Controls)
TEC1102-1 (Johnson Controls)
HP32-N2
Power Requirements
20-30 VAC, 50-60 Hz, Class 2, 24 VAC nominal, 2.4 VA maximum not including
driven loads
Relay Contact Rating
Maximum Inductive:
Maximum Resistive:
Minimum:
Binary Inputs
(LED 1, LED 2, CLK1)
20-30 VAC or 22-30 VDC (Negative on 24V [C] terminal). Switches at 2 VDC.
1 ampere with surges to 3 amperes, 24 VAC Class 2
1 ampere, 24 VDC (2000 VA maximum for all outputs)
10 mA for 24 VAC circuit; 10 mA for a 24 VDC circuit
Recommended Wire Size 18 gauge at 100 feet/22 gauge at 20 feet
Thermostat
Measurement Range
28° to 124°F (0° to 48°C)
Outdoor Air
-50° to 124°F (-48° to 48°C)
Temperature Indication
Range
Control Range
Heating: 38° to 88°F in 1° increments (5° to 30°C in 1° increments)
Cooling: 60° to 88°F in 1° increments 16° to 40°C in 1° increments)
Display Resolution
1°F (1°C)
Minimum Deadband
1°F (2°C) between heating and cooling
°C/°F Conversion
20°C = 68°F, each Celsius degree above or below 20°C is 2°F
N2 Communications
Isolated bi-directional, RS-485, 9600 baud
Ambient Operating
Conditions
32° to 131°F (0° to 55°C); 5% to 90% RH noncondensing
Ambient Storage
Temperatures
-30° to 131°F (-34° to 55°C)
Dimensions (H x W x D) 4-1/2 x 4 x 7/8 in. (114.3 x 101.6 x 22.2 mm)
Shipping Weight
0.37 lb (0.171 kg)
UL and cUL Listing
UL 873 Multiple Class 2 Device, UL94HB Plastic Enclosure
CE Compliance
CISPR 22, Residential Class B, CE Directive (89/336/EEC, EN50081/1,
EN50082/2) Industrial and Residential
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.
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.
2 TEC-N2 Series Thermostat
Table 2: TEC-N2 Series Accessory Ordering Information
Item
Product Code Number
Optional Accessories (includes mounting hardware)
Remote or Averaging Indoor Temperature Sensor with Communication Module
NT-IDS
Outdoor Air Sensor with Outdoor Air Temperature Communication Module
NT-ODT
Duct Mounted Supply Air Sensor with Outdoor Air Temperature
Communication Module
NT-DSCHG
Duct Mounted Return Air Sensor with Indoor Remote Temperature
Communication Module
NT-DUCT
Table 3: Alarm Indicators (AP32-N2 Heat Pump and GE22-N2 Multistage)
LED Position
Right
(
)
Center
(no symbol)
Left
(
)
Temperature
Alarm (no LED)
Note:
Function
BI
Indicates a fault. Controlled by external switch on LED 2, which displays a
wrench icon and reports Change-of-State (COS) to the Metasys system and
causes the Network Dial Modem (NDM) to dial out.
1
(HP32-N2 heat pump only.) Indicates when emergency (auxiliary) heat
(E ht) is activated. Internally controlled. No COS.
N/A
Indicates filter needs to be changed. Controlled by external switch on LED 1,
which displays the filter icon and reports a COS to the Metasys system and
causes the NDM to dial out.
3
If the room temperature is more than 1°F (1°C) away from the setpoint after
45 minutes of operation, a COS will occur which causes the NDM to dial out.
Once the temperature reaches the setpoint, the alarm returns to normal.
2
Either binary input (LED 1 or LED 2) can be used as a fan proving switch for other applications.
Table 4: Applications
Application
Recommended Model
Fan Coil Unit
GE22-N2
Heat Pump
HP32-N2
Unit Heaters
GE22-N2
Packaged Rooftop
GE22-N2
Packaged Heating/Cooling
GE22-N2
TEC-N2 Series Thermostat
3
Installation
The tools needed to install the TEC-N2 series thermostat are:
• drill
Required
Installation Tools
• 3/16 in. drill bit
• 1/8 in. and 1/4 in. flat-blade screwdrivers
• hammer
• marking pencil
• wire stripper
Note: Two plastic anchors with screws and the cover lock are included
with the TEC-N2s.
Mounting the
TEC-N2 Series
Thermostat
Note: Mount the TEC-N2 series thermostat on an interior wall, approximately 1.5 m (5 ft) above the floor in a location of average temperature (e.g., 72°F). Do not mount the thermostat on outside
walls or behind doors. Be sure to install the thermostat away from
direct sunlight or radiant heat, air discharge grilles, stairwells, or
outside doors. Keep the thermostat away from steam or water
pipes, warm air stacks, areas with no airflow, or sources of electrical interference.
To mount:
1. Lift the thermostat cover and insert a small coin into the slot located
in the bottom center of the thermostat case.
2. Twist 1/4 turn (Figure 2).
3. Grasp the base from the bottom two corners, and separate from the
thermostat.
<
<
Figure 2: Separating and Mounting the TEC-N2
4. Swing the thermostat out from the bottom, and lift up and out from
the base.
Note: When replacing an existing thermostat, use wire tags to identify
terminal designations.
4 TEC-N2 Series Thermostat
5. Place the rectangular opening in the base over the equipment control
wires.
6. Use the base as a template, and mark the location of two mounting
holes.
7. Drill two 5 mm (3/16 in.) holes at the marked locations.
8. Tap nylon anchors (included) flush to wall surface.
Wiring the TEC-N2
Series
Thermostats
9. Place thermostat mounting holes over anchors, and screw the thermostat into place using the included anchor screws (Figure 2).
Follow these steps to wire the TEC-N2s:
1. Connect the wires from the existing system to the thermostat terminals. Refer to Figure 3, and Figure 5 for wiring diagrams.
2. Push any extra wire back into the wall. The wires must be flush to
the plastic base.
3. Plug the hole in the wall to eliminate air drafts on the sensor.
Setting the DIP
Switches
Select Dual Inline Package (DIP) switches to perform a variety of different functions: fan runtime delay, keyboard disable, and multistage heating
or cooling.
Note: Before selecting a minimum on/off time for the TEC-N2 series,
verify the equipment can tolerate the following hourly maximum
cycle rates: 7.5 cycles per hour when using 4-minute on/off (preferred for energy savings) or 15 cycles per hour when using
2-minute on/off.
TEC-N2 Series Thermostat
5
HP32-N2 Heat Pump Wiring Configuration and DIP Switch Settings
Table 5: HP32-N2 Heat Pump DIP Switch Selections
DIP
Switch
Selection
Description
1
On
Compressor/Auxiliary Interlocked: turns off the compressor when the auxiliary heat
(E Ht) is on. The compressor will remain off for 2 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.
2
Off
Not used. Switch should remain in the OFF position.
3
On
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 (preferred).
4
On*
Locks the keyboard, disabling buttons to prevent tampering. DAY/NIGHT mode button
can select 1-hour override.
Off
Unlocks the keyboard.
5
On
Comfort: allows the auxiliary heat to be energized when the room temperature error is
greater than 1°F (0.5°C) for 1.5 hours.
Off
Economy: minimizes the use of auxiliary heat. If the room temperature error is 1°F
(0.5°C) for 3 hours, auxiliary heat is energized.
On
Allows multistage heating or cooling.
Off
Allows single-stage heating or cooling.
On
Liquid Crystal Display (LCD) filter icon (
24 VAC.
Off
No filter icon.
On
LCD wrench icon (
Off
No wrench icon.
8
*Note:
) turns on with LED 1 contact closure to
) turns on with LED 2 contact closure to 24 VAC.
When DIP switch 4 is on, only the DAY/NIGHT mode button can be used to select 1-hour override to
occupied setpoints if in night mode. All other buttons are read-only. The N2 address can also be viewed.
Compressor/Auxiliary
Normal
Not Used
Heat/Cool: 4 Minute
Minimum On/Off
Keyboard Unlocked
Economy
Single-Stage
LED1 icon Off
LED2 icon Off
ON
7
8 7 6 5 4 3 2 1
6
Compressor/Auxillary
Interlocked
Not Used
Heat/Cool: 2 Minute
Minimum On/Off
Keyboard Locked
Comfort
Multistage
LED1 icon (Filter)
LED2 icon
(Wrench/Fault)
HP32-N2
LED1 2nd Stage Compressor
Auxiliary Heating
LED2
CLK1 1st Stage Compressor
Fan
CLK2
Y2
W1
Y1
G
R
24VAC Power In
24V
RS1
24VAC Common
RS+V Cool Reversing Valve 24V(C)
O
N2+
Heat Reversing Valve
B
N2N2 REF
RS2
Figure 3: HP32-N2 Heat Pump, Factory-Set DIP Switch Settings,
and Wiring Configuration
6 TEC-N2 Series Thermostat
Table 6: HP32-N2 Heat Pump Output Terminal Designations
Terminal
Function
Y2
Energizes compressor 2 on call for second stage heating or cooling.
W1
Energizes auxiliary heat as third stage heating or emergency heat.
Y1
Energizes compressor 1 on call for first stage heating or cooling.
G
Energizes fan on call for heating or cooling or by pressing FAN button.
R
Provides independent switching voltage.
24V
Provides 24 VAC from equipment transformer.
24V(c)
Provides 24 VAC (common) from equipment transformer.
LED 1, LED 2
LED 1 or LED 2 contact closure to 24 VAC from remote switch.
CLK1, CLK2
Connects remote clock/timer for alternate setpoints.
RS2, RS1, RS+V
Connects outdoor air temperature or indoor remote sensors; refer to instructions included
with sensors.
O
Energizes reversing valve in the cooling mode.
B
Energizes reversing valve in the heating mode.
N2+, N2-, Ref
N2 Bus
Metasys
CPN, FAC,
NCM
If the transformer (T2) is to power all of the loads, the
yellow pin jumper must be inserted connecting
R to 24V. The jumper is located on the electronics board
above the relays. If a separate 24V transformer (T1) is to
be used, it must be connected between R and 24V(c), and
the jumper should be removed between R and 24V.
N2+ N2- REF
Jumper
W1
Y1
Y2
G
Electronics
O
B
R
24V 24V(c)
LED1
LED2
Reverse
First Stage
Valve
Fan
Compressor
Heating
Second
Reverse
Auxiliary
Stage
Valve
Heat
Compressor Cooling
Thermostat
CLK1
RS1
Equipment
CLK2
RS2
RS+V
Remote
Sensor
(if used)
T1
T2
Remote
Clock/Timer
(if used)
Field Contact Switches
Figure 4: HP32-N2 Heat Pump Wiring Schematic
TEC-N2 Series Thermostat
7
GE22-N2 Multistage Wiring Configuration and DIP Switch Settings
Table 7: GE22-N2 Multistage DIP Switch Selections
DIP Switch
Selection
Description
1
On
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
(preferred).
On*
Locks the keyboard, disabling buttons to prevent tampering. The DAY/NIGHT
mode button can select 1-hour override.
Off
Unlocks the keyboard.
3
Off
Not used. Switch should remain in the OFF position.
4
On
Allows multistage heating or cooling.
Off
Allows single-stage heating or cooling.
LED 1 icon
On/Off
Optional selection: LCD filter icon (
to 24 VAC.
LED 2 icon
On/Off
Optional selection: LCD wrench icon (
closure to 24 VAC.
2
5
6
) comes on with LED 2 contact
When DIP switch 2 is on, only the DAY/NIGHT mode button can be used to select 1-hour override to
occupied setpoints if in night mode. All other buttons are read-only. The N2 address can also be viewed.
Keyboard Unlocked
Not Used
Single-Stage
LED 1 icon Off
LED 2 icon Off
ON
Heat/Cool: 4 Minute
Minimum On/Off
6 5 4 3 2 1
N
*Note:
) comes on with LED 1 contact closure
Heat/Cool: 2 Minute
Minimum On/Off
Keyboard Locked
Not Used
Multistage
LED 1 icon (Filter)
LED 2 icon
(Wrench/Fault)
GE22-N2
LED1
LED2
CLK1
CLK2
RS1
RS2
RS+V
N2+
N2N2 REF
2nd Stage Cooling
1st Stage Heating
1st Stage Cooling
Fan
Y2
W1
Y1
G
24VAC Power In
Common
2nd Stage Heating
R
24V
24V(c)
W2
Figure 5: GE22-N2 Multistage Factory-Set DIP Switch Setting and
Wiring Configuration
8 TEC-N2 Series Thermostat
Table 8: GE22-N2 Multistage Output Terminal Designations
Terminal
Function
W2
Energizes on call for second stage heat.
Y2
Energizes on call for second stage cooling.
W1
Energizes on call for first stage heat.
Y1
Energizes on call for first stage cooling.
G
Energizes fan on call for heating or cooling or by pressing the FAN button.
R
Independent 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 to 24 VAC.
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.
N2+, N2-, REF
Metasys N2 Bus connections
Metasys
CPN, FAC,
NCM
If the transformer (T2) is to power all of the loads, the
yellow pin jumper must be inserted connecting
R to 24V. The jumper is located on the electronics board
above the relays. If a separate 24V transformer (T1) is to
be used, it must be connected between R and 24V(c), and
the jumper should not be connected between R and 24V.
N2+ N2- REF
Jumper
W1
Y1
W2
Electronics
Y2
G
R
24V 24V(c)
LED1
LED2
First Stage
Heat
Second
Stage
Heat
First
Stage
Compressor
Fan
Second
Stage
Compressor
Remote
Sensor
(if used)
T1
Connecting the
N2 Bus
Thermostat
CLK1
RS1
Equipment
CLK2
RS2
RS+V
T2
Remote
Clock/Timer
(if used)
Field Contact Switches
Figure 6: GE22-N2 Multistage Wiring Schematic
To connect the N2 Bus:
1. Observe the polarity when connecting the N2 Bus wires to the
TEC-N2.
Note: Each TEC-N2 has self-terminating End-of-Line (EOL) resistors.
However, one EOL is needed at the BAS (two are preferred at
opposite ends).
2. Continue this process for each TEC-N2 using the daisy chain wiring
method (Figure 7).
TEC-N2 Series Thermostat
9
NCM300 Series
Port 1 - N2 Bus
TEC-N2
NCM200 Series
(TB1 or Communicator
Terminal Board)
HRD
6 3 SFT
GRD
GRD
SFT
7 2 N2+
or
GRD
8 1
N2REF
N2+
N2N2 REF
N2+
N2N2
REF
To
Next N2 REF
N2N2
Device N2+
{
Figure 7: Connecting the TEC-N2 to an NCM
Connecting to
N30 Series
N30
24 VAC
DS1
TEC-N2
DS2
DS3
N2+
N2N2
REF
To
Next N2 REF
N2N2
Device N2+
{
N2+
N2REF
S
N2+
N2N2 REF
Figure 8: Connecting the TEC-N2 to the N30 Series
Connecting to
the Companion/
Facilitator
System
TEC-N2
N2+
N2REF
Companion/Facilitator
Transformer
24VAC
GND
24VAC
N2+
N2N2 REF
N2+
N2REF
N2 Bus
Connector
Figure 9: Connecting the TEC-N2 to the
Companion/Facilitator System
10 TEC-N2 Series Thermostat
Connecting to
NDM
NDM
OFF
N2 ADDRESS
1
2
4
8
16
32
64
128
TEC-N2
REF
N2N2+
N2+
N2REF
NU-NDM101-0
REV - M9426
N2 TRANSMIT
N2 RECEIVE
N2 END
OF LINE
REF
N2N2+
POWER
_
+
9-12 VAC/DC
0.5A
1995
4100/D01/03
JOHNSON CONTROLS INC.
ALL RIGHTS RESERVED
Figure 10: Connecting the TEC-N2 to the NDM
Setting the N2
Address
To set the N2 Address:
1. Push the FAN and MODE buttons simultaneously for ten seconds
after power up. The lower section of the display shows the current
N2 address.
2. Push the ∨ or ∧ buttons to change the address (1-253). Map the TECN2 into CPN/FAC/NCM/N30 series as a vendor device (VND).
3. Push any button to exit this mode, or wait five seconds and the TEC
automatically returns to normal operation.
Note: You can lock the keyboard using the DIP switch to prevent
address change, however this disables access to other functions
except temporary occupancy.
N2 Device
Mapping
When adding the TEC to the Metasys system (Person/Machine Interface
[PMI] and Companion system), you must define the TEC-N2 as a VND.
For the NCM, do not direct map any points. Run control of these points
through the Control System (CS) object only.
Note: For the TEC-N2, do not use the Adjust command with the
Companion/Facilitator (CPN/FAC) system, since it is not supported. The TEC-N2 responds with an offline message but continues
to operate normally.
TEC-N2 Series Thermostat
11
Table 9: N2 Bus Objects
Point Name
TEC-N2
Point
Type/
Addr
N30
(CPN/
FAC)
Object
Type
BAS
Model
Point
Type
Override Range
HP32
-N2
GE22
-N2
Room Temp
ADI-1
N2 AI (AI)d
CSAD ADI1
0° to 48°C
(28° to 124°F)
♦
♦
ADI-2
N2 AI (AI)d
CSAD ADI2
-48° to 48°C
(-54° to 124°F)
♦
♦
ADI-3
N2 AO (AO)
CSAD ADI3
1° to 47°C (29° to 99°F)
♦
♦
ADI-4
N2 AO (AO)
CSAD ADI4
1° to 47°C (29° to 99°F)
♦
♦
ADI-5
N2 AO (AO)
CSAD ADI5
1° to 47°C (29° to 99°F)
♦
♦
ADI-6
N2 AO (AO)
CSAD ADI6
1° to 47°C (29° to 99°F)
♦
♦
ADI-7
N2 AO (AO)
CSAD ADI7
1° to 47°C (29° to 99°F)
♦
♦
ADI-8
N2 AO (AO)
CSAD ADI8
1° to 47°C (29° to 99°F)
♦
♦
ADI-9
N2 AO (AO)
CSAD ADI9
1° to 47°C (29° to 99°F)
♦
♦
ADI-10
N2 AO (AO)
CSAD ADI10
1° to 47°C (29° to 99°F)
♦
♦
BD-1
N2 BO (BO)
CSBD BD1
0 = Off/Auto,
1 = On/MAN
♦
♦
BD-2
N2 MSOef (AO)
CSMS BD2
0 = Off 1= Cool,
2 = Heat, 3= Auto,
f
4 = E Ht (Aux Heat)
Mode
0-4
Mode
0-3
Occupancy
BD-3
N2 BO (BO)
CSBD BD3
0 = Unoccupied,
1 = Occupied
♦
♦
W1 State
BD-4
N2 BI (BI)
CSBD BD4
0 = Off, 1 = On
E Heat
Heat 1
W2 State or Heat
Pump O/B
BD-5
N2 BI (BI)
CSBD BD5
0 = Off, 1 = On
Heat
Pump
O/B
Heat 2
Y1 State
BD-6
N2 BI (BI)
CSBD BD6
0 = Off, 1 = On
Comp 1
Cool 1
Y2 State
BD-7
N2 BI (BI)
CSBD BD7
0 = Off, 1 = On
Comp 2
Cool 2
BD-8
N2 BI (BI)
CSBD BD8
0 = Off, 1 = On
♦
♦
BD-9
N2 BO (BO)
CSBD BD9
0 = °C, 1 = °F
♦
♦
BI-1
N2 BI (BI)
CSBI BI1
0 = Normal, 1 = Alarm
♦
♦
BI-2
N2 BI (BI)
CSBI BI2
0 = Normal, 1 = Alarm
♦
♦
BI-3
N2 BI (BI)
CSBI BI3
0 = Normal, 1 = Alarm
♦
♦
Outdoor Temp
a
a
Heating SP
a
Cooling SP
a
Setback Heating SP
a
Setback Cooling SP
a
Minimum Heat SP
a
Maximum Heat SP
a
Minimum Cool SP
a
Maximum Cool SP
a
Fan
a
Mode
a
G State – Fan
Temp Units
ac
b
Wrench BI
b
Temp Alarm
Filter
b
Notes: See following page.
12 TEC-N2 Series Thermostat
a Commandable.
b Can be a COS alarm to the BAS or NDM to initiate a dial out.
c On the Metasys NCM system, map BD9 “Temp Units Mode” as a Binary Output (BO) object in a Control System (CS)
object with Autorestore and Local Control set.
d AIs are commandable in the Companion/Facilitator system.
e The Multiple Command Output (MCO) object is used to schedule multiple Multi-State Objects (MSOs).
f
When defining the N2 MSO object, select TEC Mode from the States Text Menu. Type 5 in the Number of States field if
you’re using the HP32-N2 Heat Pump model, or type 4 for any other model. Mode 4, or Emergency (Auxiliary) Heat (displayed as E ht), is only available on the HP32-N2 Heat Pump model.
The Controller Point Type is the fixed point definition inside the controller. The CPN/FAC point is the software point definition
inside the Companion software. The BAS Model Point type is the definition inside the model file. An NCM CS object must be
used to retrieve the data.
Control of the Analog Data (AD) objects is “the last command received is the one that controls the thermostat.” For example,
if the Metasys system sends a night override, but the occupant selects day mode, the TEC goes into day mode.
Installing the
Thermostat
Cover Lock
To install the thermostat cover lock:
1. Place the ends of the lock piece (included with unit) under the lock
pins extending from the bottom of the mounted base. The tab in the
middle of the lock piece extends downward from the mounted base
(Figure 11).
2. Press the lock piece up and into the base while gently prying open the
thermostat to release the lock. Use caution to avoid cracking the thermostat base or cover.
Plastic
Lock Pins
Hinged
Tabs
Thermostat
Base
Snap
plastic lock
piece into place.
Figure 11: Installing the Thermostat Cover Lock
Reattaching the
Thermostat
To reattach the thermostat:
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.
3. Press on the bottom center edge until plastic lock snaps in place
(Figure 11).
TEC-N2 Series Thermostat
13
TEC-N2
Features
Table 10: TEC-N2 Features
Feature
Description
Control
Algorithm
Over time, the TEC-N2 learns how long it takes the system to meet the load. If the system
can change the room temperature quickly, the TEC-N2 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, the TEC-N2 does not allow the temperature to drift as far
from setpoint. The TEC-N2 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 multistage applications, the TEC-N2 does not bring on the next stage of cooling or
heating if it knows that the system can change the temperature by 6° in one hour or 1° in
10 minutes. To verify thermostat operation, force the next stage on by changing the setpoint
by more than 2° (see the Verifying Proper Thermostat Operation section).
Clock Terminals
CLK1 - CLK2
The TEC-N2 thermostat accepts a contact closure for a clock/timer to allow the use of
alternate or setback heating and cooling setpoints in place of a BAS.
When the contact is open, the day icon ( ) appears, and the thermostat adjusts to the day
setpoint. When the contact is closed, the night icon ( ) appears, and the thermostat adjusts
to the night setpoint. Pressing the DAY/NIGHT button when the thermostat is in night mode
will switch the thermostat to day mode, even if a clock/timer is used. The clock (CLK)
contacts on the thermostat are in parallel with the thermostat DAY/NIGHT button 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 from the front panel, then
at the next clock control time, the thermostat will stay in the day mode. When the contacts
close again the following night, the thermostat will switch to night setpoints.
Temporary
Occupied with
Keyboard Lock
When in night mode, select this feature by pushing DAY/NIGHT button to put TEC-N2 in
1-hour timed override to occupied setpoints.
Remote Sensor
When using a remote sensor (NT-IDS), the TEC-N2 internal sensor is disabled. If two to
six remote sensors are connected, then they can be used for temperature averaging.
Outdoor/Duct
Temperature
Sensor
There are two separate analog inputs on the TEC-N2, which are the room sensor and a
duct or outdoor air sensor on a slave bus. The duct temperature displays when the
OUTDOOR button is pushed. On the GE22-N2, the outdoor/duct sensor simply is a
monitor of temperature. On the HP32-N2, the outdoor temperature provides a low
temperature lockout (see Displaying Outdoor/Duct Air Temperature under the
Commissioning section later in this document). Both of these can be displayed on the LCD
at the Metasys system. The outdoor temperature can be a global N2 override from a
single sensor.
Power Failures or
N2 Failures
In the event of a power failure, or ten minutes after an N2 communication loss, the
thermostat retains the last setpoints. When power is restored, it remains in normal operation
and does not require resetting. If power was lost when the thermostat was in night mode, it
returns to day mode.
N2 Dial Module
(NDM)
There are three binary input points to cause a COS that triggers the remote NDM to dial out.
Binary inputs 1 and 3 (wrench and filter) are general purpose inputs powered by 24 VAC or
22-30 VDC. Binary input 2 is the temperature alarm binary data point that will cause a COS
if the zone temperature is moving away from the setpoint after 45 minutes. The COSs
N2 Address
Push FAN and MODE buttons simultaneously and hold for ten seconds to view address.
14 TEC-N2 Series Thermostat
Commissioning
Verifying Proper
Thermostat
Operation
To verify proper thermostat operation:
1. Press the MODE button to select the heating or cooling mode.
2. Press the ∨ or ∧ buttons to raise the setpoint above or below the current ambient temperature. The thermostat calls for either heating or
cooling.
To energize each stage of heating quickly, set the heating setpoint 2°F
above the present room temperature. Wait for the heat icon displayed on
the LCD. For example, if the room temperature is 70°F, set the heating
setpoint to 72°F. The first stage of heating should energize. Once the heat
icon is off, readjust the setpoint 2°F above the last setpoint (for example,
74°F). When the heat icon is off, adjust the setpoint 2°F higher (76°F), to
energize the auxiliary heat (HP32-N2 model only).
Selecting an
Operation Mode
Press the MODE button to select from the modes listed in Table 11.
Table 11: TEC-N2 Series Thermostat Modes
Mode
Description
COOL
When the snowflake icon ( ) and the word COOL are displayed, the
thermostat is in the cooling mode. When the thermostat is calling for
cooling, the snowflake blinks.
HEAT
When the flame icon ( ) and the word HEAT are displayed, the
thermostat is in the heating mode. When the thermostat is calling for
heating, the flame blinks.
E Ht
When the flame icon ( ) and E Ht (emergency heat) are displayed, the
thermostat operates using the emergency heat with the compressor locked
out (HP32-N2 Heat Pump only).
Auto
When the snowflake ( ) and the flame ( ) icons and the word Auto are
displayed, the thermostat automatically changes over between heating and
cooling.
OFF
When OFF is displayed, the equipment does not operate.
Note:
The thermostat never allows less than 2°F (1°C) difference between cooling and
heating setpoints. Use caution when using the OFF mode in extremely cold
weather.
TEC-N2 Series Thermostat
15
Selecting a
Temperature
Scale
Press the ∨ and ∧ buttons simultaneously to alternate between Celsius and
Fahrenheit display. This will not affect the BAS display. For example, hotel
room temperature can be displayed in °F on the Companion system, but a
hotel guest can switch the local display to °C. If power loss occurs, the
TEC-N2 reverts to the last network command (in this example, °F).
Selecting Fan
Operation
For continuous operation, press the FAN button and the fan icon (k)
appears. If the FAN button has not been selected, the fan operates automatically on a call for heat or cool (no fan symbol appears).
Displaying
Outdoor/Duct
Air
Temperature
When an outdoor or duct temperature sensor (order separately) is connected to the TEC-N2 thermostat or if the outdoor air temperature is
available from the N2 network, press the OUTDOOR button. The temperature will be displayed along with corresponding icons (t). The
Metasys BAS can display the outdoor duct air temperature when mapped
back. The HP32-N2 uses the outdoor air sensor or N2 value for low temperature compressor lockout and high temperature heating lockout. When
there is no N2 command and the sensor option is not connected, the thermostat displays —- when the button is pushed.
Setting the
Electronic
Outdoor High
and Low
Balance
Points
To use outdoor air lockout, you must set the high and low balance points.
Any outside temperature above the high balance point locks out the auxiliary heat, and any outside temperature below the high balance point
allows the auxiliary heat to run when called for by the thermostat.
Similarly, any outside temperature below the low balance point will lock
out the compressor, and any temperature above the low balance point
allows the compressor to run when called for by the thermostat. Both balance points can be set from -48° to 50°C (-55° to 125°F).
Note: To set the high and low balance points, an outdoor sensor must be
attached to the unit.
To set the high and low balance points for outdoor air lockout:
1. Press and hold the OUTDOOR button, then press the MODE
button. HibP appears in the display, meaning high balance point,
along with the current balance setpoint.
2. Press the ∨ and ∧ buttons to set the high balance point temperature.
3. Press the OUTDOOR button. LobP appears in the display, meaning
low balance point, along with the current balance setpoint.
4. Press the ∨ and ∧ buttons to set the low balance point temperature.
5. Press the MODE button to resume operation.
16 TEC-N2 Series Thermostat
Selecting Day or
Night Mode (ef)
When the TEC-N2 series thermostat is first installed, or after a power
loss, the display shows the day icon (e) and the temperature. Once the
BAS overrides the day or night mode, the corresponding symbol will be
displayed.
To select day or night mode:
Sensor
Calibration
•
Use BAS to schedule the day or night modes through the occupancy
binary data point, or
•
Press the DAY/NIGHT button (ef), or
•
Install a time clock using the CLK1 and CLK2 terminals, to activate
the thermostat’s night mode.
The internal and remote sensors can be calibrated to eliminate wire
resistance errors or to match another reference.
To calibrate the thermostat:
1. Press and hold the FAN button for 10 seconds.
2. Adjust the temperature with the ∨ and ∧ 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.
3. Press the FAN button again to accept the reading.
Setting the
Thermostat
Setpoints
To set the thermostat setpoints:
1. Press the DAY/NIGHT button until the day icon (e) appears.
2. Set the mode to cool (j).
3. Select the desired temperature for equipment to maintain during the
day while in the cooling mode, using the ∨ or ∧ buttons. The cooling
setpoint range is 16° to 40°C (60° to 88°F).
4. Set the mode to heat (i).
5. Select the desired temperature for equipment to maintain during the
day 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 the night icon (f) appears.
7. Repeat steps 2 through 5 for the night setpoints.
8. Verify N2 address is not inadvertently changed.
Keyboard Locked
The keyboard lock is selected by setting the DIP switch. The locked icon
(z) appears on the display when any button is pressed. Use keyboard
lock to put the TEC-N2 into occupied setpoints for one hour. All the
TEC-N2 values may be overridden from the Operator Workstation
(OWS).
TEC-N2 Series Thermostat
17
Troubleshooting
N2 Bus
Configuration
Troubleshooting
See Table 12 if the TEC-N2 thermostat does not function properly
during N2 Bus Configuration.
Table 12: N2 Bus Configuration Troubleshooting
Error/Trouble
Condition
Possible Causes
Solution
TEC-N2 cycles online
and offline.
Two or more controllers have the
same address.
Change each duplicate address to a unique
number.
There are Y or T taps or the
repeater lost power or is wired
incorrectly.
Refer to the Johnson Controls N2
Communications BusTechnical Bulletin
(LIT-636018).
Two or more controllers have the
same address.
Change each duplicate address to a unique
number.
N2 Bus contains too many devices.
The maximum of N2 devices allowed on the
N2 Bus is as follows: 100 devices per NCM,
32 devices per N30, 32 devices per N31,
150 devices per the Companion/Facilitator
system.
TEC-N2 does not have power.
Apply power to the TEC-N2.
N2 cable runs are broken.
Locate and correct the wiring.
Device type is incorrect.
TEC1100 address must be VND device type.
EOL jumpers on MM-CVT101 or NCM
are not installed.
Install EOL jumpers properly.
MM-CVT101 is not plugged into PC or
120 VAC source.
Plug MM-CVT101 into PC or plug it into a
120 VAC source.
Wiring near the BAS is broken.
Repair the wiring.
No point mapping entered.
Define the BAS database.
TEC-N2 does not come
online.
Entire N2 Bus is offline.
18 TEC-N2 Series Thermostat
Occupant
Hot/Cold
Complaints
Troubleshooting
Zone temperature control problems, usually reported as occupant hot/cold
complaints, can have causes ranging from the building or mechanical system to the control components. Table 13 helps locate the cause of zone
temperature control problems with TEC-N2 series thermostats.
Table 13: TEC-N2 Series Thermostat 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 is locked.
Switch the keyboard DIP switch to the unlocked position.
Thermostat does
not call for heat.
Short cycle delay still in
progress.
Wait 2 to 4 minutes for the equipment short cycle
protection to complete.
Thermostat setpoint is
satisfied.
Press MODE button until thermostat is in heat mode. Raise
the heating setpoint using the Ÿ button.
Short cycle delay still in
progress.
Wait 2 to 4 minutes for the equipment short cycle
protection to complete.
Thermostat setpoint is
satisfied.
Lower the cooling setpoint using the ⁄ button.
Fan failure.
Place a wire between terminals R and G. Fan should turn
on. If it does not, troubleshoot the fan system. If fan contact
does not energize, replace the thermostat.
Plenum temperature switch
failure.
In heat mode with a separate plenum switch, the fan will
not turn on until the plenum is up to its preset temperature.
Replace the plenum switch.
AC is flashing in
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 and
30 VAC, replace the thermostat.
LCD shows missing
or extra segments.
LCD failure.
Replace the unit.
-55 appears when
OUTDOOR button is
pushed.
The sensor wire is open
inside the outdoor/duct
sensor module.
Repair or replace the sensor element.
-- -- -- appears.
Miswired outdoor air sensor
or N2 override missing.
Add the sensor. Check the N2 command.
Thermostat does
not call for cooling.
Fan does not turn
on with the system.
TEC-N2 Series Thermostat
19
NetworkThermostats.com
352-00150-001 Rev A
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