Azbil TY6800Z Series User manual

1
AB-6600
Insertion Thermostat
Specifications/Instructions
General
Models TY6800Z and TTY6800Z are insertion
thermostats applicable to control temperature (two-
position) for air in duct and liquid in tank or pipe.
Features
(1) Electric two-position control
The temperature sensing element, filled with
liquid, detects changing of temperature.
Model TY6800Z has a built-in microswitch,
TTY6800Z has two built-in microswitches. They
are applicable to heating or cooling control.
(2) Easy temperature setting and differential gap
adjustment
Temperature setpoint is easily set by the knob
in the front of the thermostat.
Model TY6800Z has the differential gap adjustment function to control equipment smoothly.
Each microswitch of Model TTY6800Z has the xed differential gap. Difference between the two switches
is easily adjusted to enable suitable sequence control for the connected equipment.
Model Numbers
Model Number Temperature
setting range (°C)
Allowable max. temp.
of temp. sensor (°C)
Allowable min. temp.
of temp. sensor (°C) Capillary length (m)
TY6800Z6000 -15–70 100 -40 1.5
TY6800Z6010 -15–70 100 -40 5
TY6800Z7000 5–90 100 -40 1.5
TY6800Z7010 5–90 100 -40 5
TY6800Z8000 40–125 150 -40 1.5
TY6800Z8010 40–125 150 -40 5
TTY6800Z6000 -15–70 100 -40 1.5
TTY6800Z6010 -15–70 100 -40 5
TTY6800Z7000 5–90 100 -40 1.5
Note: Actual length of capillary is 1.35–1.6 m for 1.5 m type, 4.75–5 m for 5 m type. Order the capillary considering the minimum required length.
zParts ordered separately
Description Model Number Note Reference
Immersion well 112624AA-J R1/2 SUS304 Figure 2. in this manual
AB-4074, Immersion Wells Specications/
Instructions
Pressure tting 83165370-001 1/2NPT Figure 3. in this manual
Temperature sensor holder DY3002A1011 Construction
material
Figure 4. in this manual
AB-4009, Bulb Holder Specifications/
Instructions

2
AB-6600
Safety Instructions
Please read instructions carefully and use the product
as specied in this manual.
Be sure to keep this manual near by for ready
reference.
Usage Restrictions
This product is targeted for general air conditioning.
Do not use this product in a situation where human
life may be affected.
If this product is used in a clean room or a place
where reliability or control accuracy is particularly
required, please contact our sales representative.
Azbil Corporation will not bear any responsibility for
the results produced by the operators.
zCautions for connecting to system
•If this product breaks down, it does not have function
to avoid or notify the abnormal conditions to other
equipment.
Please take countermeasures independently from this
product.
•If the enclosed liquid leaks, the contacts are welded, etc.,
the output might be stuck to ON.
To use this product for controlling a heating device
such as hot water heater, be sure to implement safety
measures, e.g., preventing dry-heating.
zProhibitions for installing this product
Do not install the product in the following environments.
Doing so might cause malfunction of the device or device
failure in a short period of usage.
•Where special chemicals or corrosive gas (such as
ammonia, sulfur, chlorine, ethylenic compound, acids,
etc.) exist.
• Where water droplets or excessive damp air exists.
•Where condensation is made on the product.
• Where exposed to direct sunlight or high temperature.
•Where vibrations or shocks are applied.
•Where dust or particles will not easily enter into the
product.
zCautions for installing this product
•Mount the the temperature sensor where representative
temperature of the measuring object can be measured.
• Do not mount the temperature sensor in locations such
as the following.
Temperature may not be correctly measured.
• Where exposed to warm or cold wind directly. 
• Where air stagnates or there is a draft. 
• Where water level changes largely.
• Where the temperature sensor cannot be securely
mounted.
•Where unauthorized persons can have easy access.
•Secure space around the product for maintenance.
Warnings and Cautions
WARNING
Alerts users that improper
handling may cause death or
serious injury.
CAUTION
Alerts users that improper
handling may cause minor injury
or material loss.
Signs

Alerts users possible hazardous conditions
caused by erroneous operation or erroneous
use. The symbol inside indicates the
specic type of danger.(For example, the sign
on the left warns of the risk of electric shock.)

Notifies users that specific actions are
prohibited to prevent possible danger. The
symbol inside graphically indicates the
prohibited action.(For example, the sign on
the left noties that disassembly is prohibited.)

Instructs users to carry out a specific
obligatory action to prevent possible danger.
The symbol inside graphically indicates
the actual action to be carried out. (For
example, the sign on the left indicates general
instructions.)
WARNING
If this product is connected to a system, be
sure to implement safety measures.
Failure to do might cause re.

Be sure to ground the product with ground
resistance of less than 100 Ω. Improper
grounding might cause electric shock or
malfunction.

Before wiring or servicing, be sure to turn off
the power to this product.
Failure to do might cause electric shock or
device failure.

Before attaching or detaching the terminal
cover for wiring, be sure to turn off the power
to the product and all the connected devices.
After the wiring work, attach the terminal
cover at the original position.
Failure to do so might cause electric shock.

If seal connectors or conduits cannot be used,
use grommets.
Failure to do so might cause electric shock
due to touching the terminals.

3
AB-6600
CAUTION

Use this product under the operating
conditions (for temperature, humidity,
power, vibration, shock, mounting direction,
atmosphere, etc.) listed in the specications.
Failure to do so might cause fire or device
failure.
Installation and wiring must be performed
by qualied personnel in accordance with all
applicable safety standards.
All wiring must comply with applicable codes
and ordinances.

To connect the wires to the screw terminals,
use crimp terminal lugs that have insulation.
Failure to do so might cause short circuit and
result in device failure or re.
Firmly tighten the terminal screws.
Insufficient tightening of the terminal screws
might cause overheating or re.
Do not disassemble the product.
Doing so might cause electric shock or device
failure.
Dispose of the product as industrial waste in
accordance with your local regulations.
Do not reuse all or part of this product.
IMPORTANT •To use this product properly, follow the
instructions described in this manual and
the manuals for other devices connected
to this product.
•Use the product within the rated operating
ranges given in this manual. Failure to do
so might cause contact welding and xed
output.
Dimensions
zInsertion thermostat
Figure 1. Model TY6800Z, TTY6800Z (mm)
φ6.5 50
145
(152max.)
(φ80)
106.424.8
5.2
24.8
58.5 15.5
31
Grounding terminal
φ22 Knockout holes
(x2)
5.6
R
(71.5)
Temperature
sensor
Capillary length (exposed portion)
1350–1600 or 4750–5000

4
AB-6600
zAuxiliary parts
< Immersion well >
Figure 2. Dimensions of Model 112624AA-J (mm)
< Pressure tting >
Figure 3. Dimensions of Model 83165370-001 (mm)
< Temperature sensor holder >
Figure 4. Dimensions of Model DY3002A1011 (mm)
14
φ14.3
140
R1/2 screw
Seal ring
16
50
30
23 8
1/2NPT
Packing
Capillary
tube
2543
Washers (x4)
Nut
(2)
22.4
356
Accessories: tapping screws (x2)
Nominal diameter 4.5, L=16
2
17.5
3535
41.3
82.6
14.3
φ4.6 Mounting hole
17.5
φ6.4 Mounting hole
(3.5)
t0.5
10
φ5
19
(47.5)
82.6
41.3
(16.5)(31)

5
AB-6600
Specications
Item Specication
Differential
gap
Model
TY6800Z
Two-position control Approx. 3–11 °C (variable)
Model
TTY6800Z
Two-position, two-step
control
Each microswitch's differential gap: xed to approx. 3 °C
Differential between two switches: approx. 2.5–8 °C (variable)
Switching operation Refer to Figure 13., Figure 16., and Operation.
Model
TY6800Z
When temperature rises, terminal R and W are Closed, terminal R and B are Open.
When temperature falls, terminal R and W are Open, terminal R and B are Closed.
Model
TTY6800Z
When temperature rises, switch 1 terminal R and W are Closed, terminal R and B are Open.
Furthermore, temperature rises, switch 2 terminal R and W are Closed, terminal R
and B are Open.
When temperature falls, switch 2 terminal R and W are Open, terminal R and B are Closed.
Furthermore, temperature falls, switch 1 terminal R and W are Open, terminal R and
B are Closed.
Switch contact rating Motor load 120 V AC 240 V AC
Operating 8 A 5.1 A
Startup 48 A 30.6 A
Environment conditions Operating conditions Transportation/storage
conditions
Ambient temp. 0–50 °C -20–60 °C
Ambient humidity Max. 90 % RH
(without condensation)
Max. 95 % RH
(without condensation)
Temperature
sensor
Size Max. φ6.5x152 mm
Material Copper
Max.
pressure
0.35 MPa
Capillary
tube
Length Approx. 1.5 m (actual 1.35–1.6 m)
Approx. 5 m (actual 4.75–5 m)
Note Length of Model TTY6800Z7000 (temperature range: 5–90 °C) is 1.5 m only.
Material Copper
Installation Mount the thermostat using the mounting holes on the back side of its case.
(See Figure 7. and 8.)
Wiring Wire to the terminal screws (M4) on the microswitch.
Weight Model
TY6800Z
0.45 kg
Model
TTY6800Z
0.5 kg
Major
materials
Cover Polycarbonate resin, natural gray (Munsell value: N6.8)
Case Cold rolled steel plate (1.2 mm thick) with galvanization
Accessories Round machine screws (M4x12), 3 pcs
Hexagonal nuts (M4), 3 pcs
Grommet (nylon resin, black), 1 pc
Auxiliary parts
(to be ordered separately)
Immersion well Model 112624AA-J, R1/2 screw, SUS304
(See Figure 2., AB-4074)
Pressure tting Part No. 83165370-001, 1/2NPT screw, brass
(See Figure 3.)
Temperature sensor
holder
Model DY3002A1011, construction material
(See Figure 4., AB-4009)

6
AB-6600
Installation
CAUTION

Use this product under the operating
conditions (for temperature, humidity,
power, vibration, shock, mounting direction,
atmosphere, etc.) listed in the specications.
Failure to do so might cause fire or device
failure.
Installation and wiring must be performed
by qualied personnel in accordance with all
applicable safety standards.
Install the product referring to Figure 7., 8., and 9.
• If the temperature sensor is attached at higher
position than the main unit, part of the capillary
tube should be lower than the main unit.
Water made by condensation etc. may enter the
main unit to cause a short circuit, re, or failure.
• If the product is installed outdoors, place it in a
plastic box.
Note: The waterproof cover (Model Q615) is not applicable for this
product.
zProhibitions for installing this product
Do not install the product in the following environments.
Doing so might cause malfunction of the device or device
failure in a short period of usage.
•Where special chemicals or corrosive gas (such as
ammonia, sulfur, chlorine, ethylenic compound, acids,
etc.) exist.
• Where water droplets or excessive damp air exists.
•Where condensation is made on the product.
• Where exposed to direct sunlight or high temperature.
•Where vibrations or shocks are applied.
•Where dust or particles will not easily enter into the
product.
zCautions for installing this product
•Mount the the temperature sensor where representative
temperature of the measuring object can be measured.
• Do not mount the temperature sensor in locations such
as the following.
Temperature may not be correctly measured.
• Where exposed to warm or cold wind directly. 
• Where air stagnates or there is a draft. 
• Where water level changes largely.
• Where the temperature sensor cannot be securely
mounted.
•Where unauthorized persons can have easy access.
•Secure space around the product for maintenance.
zInstallation procedure
IMPORTANT •Do not twist or sharply bend the capillary
tube.
•Do not leave the cover for the unit and
terminals detached.
Mount the thermostat with the screws through 3
mounting holes provided on its rear side to a wall or
panel.
Detach the front cover and the terminal cover
before mounting the thermostat.
Figure 5. Attaching/detaching the front cover
Figure 6. Attaching/detaching the terminal cover
Front cover
mounting screw (x1)
Front cover
Main unit
Terminal cover
mounting screw (x1)
Terminal cover
Main unit

7
AB-6600
Figure 7. Mounting wall/panel dimensions (mm)
Figure 8. Installation procedure
31
106.4 106.4
31
4.5 Hole
(Wall or panel)
Mounting nuts (x3)
Accessories: M4
Mounting screws (x3, accessories)
M4, L=12
Wall plate
t1.6 ～3.2
Main unit

8
AB-6600
Note: If the immersion well is used, ll the well with special grease to improve response performance of the temperature sensor.
(Ex. For the stainless steel immersion well, response performance will be improved by approx. 15 %.)
For the special grease, the silicon grease, G-30M (Shin-Etsu Chemical) or equivalent, is recommended.
Figure 9. Installation
Pressure fitting installation
1/2NPT screw
Packing
Plug
Capillary tube
Washers
Nut
Surface of tank
(boiler) ク
壁
83
35
83
83
83
41.541.5
356
Temperature sensor
Spring clips (x2)
Position is adjustable.
Duct
Rubber
grommet
Mounting screws (x2)
Model DY3002A1011
Mounting socket Surface of pipe, tank, etc.
Immersion well
(Model 112624AA-J)
Seal the screwed
joint (R1/2).
Capillary tube
Cover setscrew
Capillary tube
Unscrew the setscrew with a screw-
driver to remove the cover from the
case.
Install the main unit and the
temperature sensor considering
length of the capillary. No direction is
specified for installing the main unit.
Capillary tube is wound up in a coil.
Unwind the tube only for the
necessary length.
Place the coil near the main unit.
Caution for installing the temperature sensor
For an accurate temperature control, install the temperature
sensor correctly.
Install it in a place where the representative temperature of
the controlled substance can be measured.
Knockout hole for wiring
Before the installation, remove the knockout hole on the top or
bottom surface of the case, which will be used to lead in the wires.
The capillary tube can be taken out from the top of the main unit.
Mount the main unit using the screws and nuts through the 3
mounting holes on the rear side of the case.
(Screws and nuts are included in accessories.)
Heat insulator
For mounting on a surface which is excessively heated, insert
a heat insulator between the back surface of the case and the
mounting surface.
Temperature sensor
The installation varies depending on applications.
For liquid, the immersion well (Model 112624AA-J) or the
pressure fitting (Model 83165370-001) is used.
For air duct, the temperature sensor holder (Model
DY3002A1011) is used.
These parts are to be ordered separately. For installation,
refer to the following figures.
Capillary tube
Never bend sharply, twist, or cut the
capillary tube.
The unit will be inoperative.
Allow enough clearance for setup
and adjustment.
Temp.
setting knob
Cover
Wall Mounting
Immersion well installation* Duct installation
Temperature sensor
Fix the capillary tube
with the spring clip
included in the
immersion well.
If the temperature sensor moves due to the
controlled substance orbends due to its own
weight, hold it straight.
Insertion length needs to be as short as possible
to avoid damage to thecapillary tube.
Seal the screwed
joint.
Tighten with
a wrench.
Place the washers to fit
the projection of a
washer and the groove
of another washer.
Temperature sensor of Model
TY6800Z, TTY6800Z
(Insert until it reaches the
bottom of the immersion well.)

9
AB-6600
Wiring
WARNING
If this product is connected to a system, be
sure to implement safety measures.
Failure to do might cause re.

Be sure to ground the product with ground
resistance of less than 100 Ω. Improper
grounding might cause electric shock or
malfunction.
Before wiring or maintenance, be sure to turn
off the power to the product. Failure to do so
might cause electric shock.

Before detaching the terminal cover, be sure
to turn off the power to the product and all the
connected devices.
After wiring, be sure to attach the terminal
cover at the original position
Failure to do so might cause electric shock.

If seal connectors or conduits cannot be used,
use grommets.
Failure to do so might cause electric shock
due to touching the terminals.
CAUTION
Installation and wiring must be performed
by qualied personnel in accordance with all
applicable safety standards.
All wiring must comply with applicable codes
and ordinances.

To connect the wires to the screw terminals,
use crimp terminal lugs that have insulation.
Failure to do so might cause short circuit and
result in device failure or re.
Firmly tighten the terminal screws.
Insufficient tightening of the terminal screws
might cause overheating or re.
IMPORTANT •To use this product properly, follow the
instructions described in this manual and
the manuals for other devices connected
to this product.
•In the final step, connect the power supply
to the product.
If you touch the terminals mistakenly, an
accident or damages might be caused.
•Connect appropriate loads, which
satisfy the contact rating specified in the
specifications, to the terminals.
•If timer, auxiliary relays, etc. are used for
additional features, select reliable parts
and implement them in circuits correctly.
•Correctly supply power, voltage and
frequency, to the devices as specified in
their specifications.
•After wiring, check that wires are correctly
wired.
Incorrect wiring may cause device damage
or malfunction.
•Remove the knockout holes being careful
not to leave protrusions or burrs. Failure
to do so might damage the wires or cause
injury.

10
AB-6600
zAttaching the grommet (accessory part)
Figure 10. Grommet (mm)
If the knockout hole on the bottom is used and
seal connectors are not used, attach the included
grommet to the openings as shown in Figure 11.
The grommet prevents a finger from entering into
the opening in order not to cause electric shock.
Note: Before wiring, attach the grommet.
(1) Insert the grommet in the knockout hole as
illustrated in Figure 12.
(2) Push the grommet until the tab clicks.
(3) Ensure the grommet is rmly inserted.
Note: Do wirings through the grommet following the instructions
in this manual.
Figure 11. Knockout hole for attaching the grommet
Figure 12. Attaching the grommet
φ23.8 6.4
Tabs
(on both sides)
Knockout hole
(at the bottom)
Grommet
zWiring method
It it is recommended using cable glands for wiring.
If cable glands are not used, hold the wires near
the product in order to reduce tension from the
wires.
(1) According to the position of cable inlet/outlet,
open a knockout hole.
(2) Remove the protrusions or burrs at the opening.
Note: There are two knockout holes prepared for wring at the
top and bottom of the product.
(3) Check the electric wires to use.
• High insulation performance
• Enough current capacity
(4) Pull in the wires through the knockout hole,
connect the wires to the screw terminals (marked
R, B, and W) on the microswitch using the round
terminals (M4 size).
(5) Ground the product.
(6) Connector other devices and power supply.
(7) Check that the wires are correctly connected.

11
AB-6600
zModel TY6800Z
When temperature rises, terminal R and W are Closed,
terminal R and B are Open.
Note: denotes a screw terminal.
Figure 13. Switch conguration
Figure 14. Example of cooling control
Figure 15. Example of heating control
Temperature
rise
RBW
Power supply
Model TY6800Z
terminals
Chiller
RBW
Power supply
Heater
Model TY6800Z
terminals
zModel TTY6800Z
As temperature rises, switch 1 (right-hand) operates rst, and
then switch 2 (left-hand) operates.
Note: denotes a screw terminal.
Figure 16. Switch conguration
Figure 17. Example of cooling two-step control
Figure 18. Example of heating two-step control
W2
B2
R2
Temperature
rise
Switch 2 (left-hand)
W1
B1
R1
Switch 1 (right-hand)
Temperature
rise
W1B1R1 W2B2R2
Switch 1
(right-hand)
Chiller 1
Chiller 2
Switch 2
(left-hand)
Power
supply
Model TY6800Z terminals
Jumper
W1B1R1 W2B2R2
Heater2
Heater1
Power
supply
Jumper
Model TY6800Z terminals

12
AB-6600
•To wire between the microswitch and the screw terminals, lay the wires from the terminals to the
microswitch though the bottom inside of the box.
• Connect the wires to the screw terminals using the round screw terminals (M4 size) as shown in Figure 19.
Note: If the wiring was done improperly, the terminal lugs or wires may interfere each other and the terminal cover cannot be attached.
Note: Insert the wires through bottom of the terminal cover opening and lay the wires in direction as illustrated by the arrow.
Figure 19.
●Example of TY6800 ●Example of TTY6800
Position of the terminal
cover opening
Approx.
4 mm
(Clearance for wiring)
Approx.
4 mm
(Clearance for wiring)
Approx.
38 mm
Approx.
4 mm
(Clearance for wiring)
Approx.
4 mm
(Clearance for wiring)
Approx.
38 mm
Fit the wires and crimp terminal lugs within this range considering the terminal cover attachment.
• If the knockout hole on the top of box is used,
lay the wires along the inside wall of the box and
connect the wires to the microswitch form the
bottom side.
zExample of wiring from the top side of box
Lay the wires along the inside wall of the box and connect the
wires to the microswitch terminals form the bottom side of the
terminal cover. Also the opposite side of the box illustrated in
Figure 20. is applicable.
Figure 20.
Terminal cover
Wires
•Wire to the ground terminal (earth) as shown in
Figure 21.
Note: Detach the terminal screw and connect the ground
wire using an insulated round crimping terminal (M4
size)..
Note: Common for Model TY6800Z, TTY6800Z.
Figure 21.
Screw for ground terminal
Grounded outside
the case
Grounded by pulling
the cable from the case

13
AB-6600
Settings
IMPORTANT •According to the thermal load, be careful to specify the differential gap so as not to cause huntings.
Failure to do so might start and stop the devices frequently and cause device failure.
•Specify the differential gap appropriately, not too wide.
Failure to do so might cause contact failure.
Set the temperature setpoint and adjust the differential gap.
zDifferential gap setting for Model TY6800Z
Turn the differential gap adjustment dial to set the gap temperature by matching the temperature scale to the
V-shape slit.
Shipping default of the differential gap is 3 °C (minimum). Turn the adjustment dial clockwise to increase the
differential gap (max. 11 °C).
Figure 22. Differential gap setting for Model TY6800Z
zDifferential between two switches setting for Model TTY6800Z
To set the differential between two switches, turn the adjustment gear using a athead screwdriver. Hook the
screwdriver blade to the slit on the adjustment gear and turn the gear.
Shipping default of the differential between two switches is 2.5 °C (minimum). Turn the adjustment gear
counterclockwise to increase the differential between two switches. Maximum value is 8 °C.
Figure 23. Differential between two switches
Microswitch with dial for
adjusting the differential gap
V-shape slit
(for setting differential gap)
Dial for adjusting the differential gap
Scale for setting the differential gap
(Factory default setting: 3 °C)
Gear for adjusting the differential
between two switches
Slit
Flathead screwdriver Monitor unit

14
AB-6600
Operations
Set a desired temperature (refer to Settings) and power on the thermostat to run it automatically.
zModel TY6800Z
Figure 24. Setpoint and differential gap for Model TY6800Z
< Cooling control >
Based on the cooling control system shown in Figure 14. Example of wiring for cooling, operation of Model
TY6800Z thermostat is described assuming the temperature setpoint: -5 °C, differential gap: 3 °C.
(1) When the temperature of the controlled target rises to the setpoint (-5 °C), the internal switch works to
close the terminal R and W, and then the chiller starts.
(2) When the temperature of the controlled target falls to -8 °C, that is setpoint (-5 °C) minus the differential
gap (3 °C), the internal switch works to open the terminal R and W, and then the chiller stops.
(3) The operations (1) and (2) described above are repeated automatically to control the temperature at the
setpoint (-5 °C).
Figure 25. Example of cooling control for TY6800Z
< Heating control >
Based on the cooling control system shown in Figure 15. Example of wiring for heating, operation of Model
TY6800Z thermostat is described assuming the temperature setpoint: 50 °C, differential gap: 3 °C.
(1) When the temperature of the controlled target falls to 47 °C, that is setpoint (50 °C) minus the differential
gap (3 °C), the internal switch works to close the terminal R and W, and then the heater starts.
(2) When the temperature of the controlled target rises to the setpoint (50 °C), the internal switch works to
open the terminal R and W, and then the heater stops.
(3) The operations (1) and (2) described above are repeated automatically to control the temperature at the
setpoint (50 °C).
Figure 26. Example of heating control for TY6800Z
Note: If the chiller's compressor motor, solenoid valve and heater, and solenoid valve start and stop very frequently, in another words the
devices start and stop very frequently, adjust the differential gap large by turning the adjustment dial in Model TY6800Z.
[°C]
Sensor (ambient temp.)
Temperature rise
Sensor (ambient temp.)
Temperature fall
Differential gap
Approx. 3–11 °C (variable)
Setpoint
Between terminal R and W: Open
Between terminal R and B: Close
Between terminal R and W: Close
Between terminal R and B: Open
Temperature
of sensor [°C]
Differential gap
3 °C
-5
(Setpoint)
-8
(2) (1)
Chiller ON Between R and W: Close
Between R and B: Open
Chiller OFF Between R and W: Open
Between R and B: Close
Temperature
of sensor [°C]
Differential gap
3 °C
50
(Setpoint)
47
(1) (2)
Heater ON Between R and W: Open
Between R and B: Close
Heater OFF Between R and W: Close
Between R and B: Open

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AB-6600
zModel TTY6800Z
As shown in Figure 27. Setpoint and differential gap for Model TTY6800ZE, the differential gap of each switch
is xed to 3 °C.
A dial for setting the setpoint is placed above the switch 1. Differential between two switches can be set
approx. in 2.5–8 °C range.
Figure 27. Setpoint and differential gap for Model TTY6800Z
< Cooling two-step control >
Based on the cooling control system shown in Figure 17. Example of wiring for cooling two-step control,
two chillers are installed. Operation of Model TTY6800Z thermostat is described assuming the temperature
setpoint: -10 °C, differential gap: 3 °C, differential between two switches: 8 °C.
(1) When the temperature of the controlled target rises to the setpoint (-10 °C), the switch 1 works to close the
terminal R1 and W1, and then the chiller 1 starts.
(2) Along with operation of chiller 1, when the temperature of the controlled target falls to -13 °C, that is
setpoint (-10 °C) minus differential gap (3 °C), the switch 1 works to open the terminal R1 and W1, and
then the chiller 1 stops.
(3) Although the chiller 1 keeps operating, if the temperature of the controlled target keeps rising and it
reaches -2 °C, that is setpoint (-10 °C) plus the differential between two switches (8 °C), the switch 2 works
to close the terminal R2 and W2, and then the chiller 2 starts.
(4) Along with operation of chiller 1 and chiller 2, when the temperature of the controlled target falls to -5 °C,
that is chiller 2 triggered temperature (-2 °C) minus the differential gap (3 °C), and then the chiller 2 stops.
Only the chiller 1 operates.
(5) When temperature of the controlled target falls further to -13 °C, that is setpoint (-10 °C) minus the
differential gap (3 °C), and then the chiller 1 stops.
(6) When the temperature of the controlled target rises again, the steps from (1) will be carried out
automatically.
Figure 28. Example of cooling two-step control
[°C]
Sensor (ambient temp.)
Temperature rise
Sensor (ambient temp.)
Temperature fall
Switch 1
Differential gap
3 °C (fixed)
Switch 2
Differential gap
3 °C (fixed)
Differential between two switches
Approx. 2.5-8 °C (variable)
Differential between two switches
Approx. 2.5-8 °C (variable)
Setpoint
Between terminal R1 and W1: Open
Between terminal R1 and B1: Close
Between terminal R1 and W1: Close
Between terminal R1 and B1: Open
Between terminal R2 and W2: Close
Between terminal R2 and B2: Open
Between terminal R2 and W2: Open
Between terminal R2 and B2: Close
Temperature of sensor [ °C]
-10
(Setpoint)
-2-5-13
(2) (1),(5)
(4) (3)
Chiller 1 ON
Between R1 and W1: Close
Between R1 and B1: Open
Chiller 1 OFF
Between R1 and W1: Open
Between R1 and B1: Close
Chiller 2 ON
Between R2 and W2: Close
Between R2 and B2: Open
Chiller 2 OFF
Between R2 and W2: Open
Between R2 and B2: Close
Switch 2
Differential gap
3 °C
Differential between two switches
8 °C
Switch 1
Differential gap
3 °C

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AB-6600
< Heating two-step control >
Based on the heating control system shown in Figure 18. Example of wiring for heating two-step control,
operation of Model TTY6800Z thermostat is described assuming the temperature setpoint: 50 °C, differential
gap: 3 °C, differential between two switches: 8 °C.
(1) When the temperature of the controlled target falls to 55 °C, that is setpoint (50 °C) plus the differential
between two switches (8 °C) minus the differential gap (3 °C), the switch 2 works to close the terminal R2
and W2, and then the heater 1 starts.
(2) Along with operation of heater 1, when temperature of the controlled target rises to 58 °C, that is setpoint (50
°C) plus the the differential between two switches (8 °C), and then the heater 1 stops.
(3) Although the heater 1 keeps operating, if the temperature of the controlled target keeps falling and it
reaches 47 °C , that is setpoint (50 °C) minus the differential gap (3 °C), the switch 1 works to close the
terminal R1 and W1, and then the heater 2 starts.
(4) Along with operation of heater 1 and heater 2, when temperature of the controlled target rises to 50
°C, the switch 1 works to open the terminal R1 and W1, and then the heater 2 stops.
Only the heater 1 operates.
(5) When the temperature of the controlled target rises further to 58 °C, that is setpoint (50 °C) plus the
differential between two switches (8 °C), and then the chiller 1 stops.
(6) When the temperature of the controlled target falls again, the steps from (1) will be carried out
automatically.
Figure 29. Example of heating two-step control
zOperation check
IMPORTANT •Because of delayed response of the sensor, the differential gap may seem to be large.
As necessary, adjust the mounting location, etc. to eliminate delayed response.
(1) Turn on the power to the product.
(2) Turn the setting knob to the setpoint.
(3) Check that the control target equipment normally runs or stops as intended.
(4) Turn off the power to the product.
50
(Setpoint)
585547
(3) (4)
(1),(5) (2)
Heater 1 ON
Between R1 and W1: Open
Between R1 and B1: Close
Heater 1 OFF
Between R1 and W1: Close
Between R1 and B1: Open
Temperature of sensor [ °C]
Heater 2 ON
Between R2 and W2: Open
Between R2 and B2: Close
Heater 2 OFF
Between R2 and W2: Close
Between R2 and B2: Open
Differential between two switches
8 °C
Switch 2
Differential gap
3 °C
Switch 1
Differential gap
3 °C

17
AB-6600
Maintenance
WARNING
If this product is connected to a system, be sure to implement safety measures.
Failure to do might cause re.
Be sure to ground the product with ground resistance of less than 100 Ω. Improper grounding might
cause electric shock or malfunction.
Before wiring or servicing, be sure to turn off the power to this product.
Failure to do might cause electric shock or device failure.

Before attaching or detaching the terminal cover for wiring, be sure to turn off the power to the
product and all the connected devices. After the wiring work, attach the terminal cover at the original
position.
Failure to do so might cause electric shock.
CAUTION
Do not disassemble the product.
Doing so might cause device failure.
Determine the appropriate cycle of maintenance and inspection, taking into consideration the environmental
conditions, frequency of use, etc.
If use is only occasional, inspection before every use is recommended.
Maintain and inspect the product following the procedures below.
(1) Wipe dirt and dust on the temperature sensor and capillary tube using a soft clean cloth or toothbrush so
that the element can be effectively exposed to the air.
(2) Check that the temperature sensor is not deformed, attened, or damaged.
(3) In the same way as (1), wipe the setting knob and the terminal posts of the microswitch and the nearby
parts.
(4) Check that the terminal screws are rmly tightened.
(5) Check that the wires are well insulated.

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AB-6600
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AB-6600
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20
Rev. 3.0 Aug. 2015 AB-6600
(J: AI-6600 Rev. 4.0)
http://www.azbil.com/
Building Systems Company
Specications are subject to change without notice.