Ray-Dot CVS-21HA User manual

User's Guide
Read this guide carefully before using the controller.
CVS-21HA
Temperature Controller
SET

2 CVS-21HA.rev.03
FEATURES ........................................................................................ 3
PRECAUTIONS ................................................................................. 5
LOCATION OF THE CONTROLS...................................................... 6
INSTALLATION.................................................................................. 9
USING THE CONTROLLER .............................................................. 13
Values flashing on the display ....................................................... 13
How to select the temperature unit ................................................ 13
How to view and reset temperatures ............................................. 14
To view the room temperature................................................... 14
To view the minimum and maximum temperatures ................... 14
To reset the minimum and maximum temperatures .................. 15
Parameter descriptions .................................................................. 15
Parameter factory settings ............................................................. 21
How to adjust the parameters ........................................................ 22
Parameter adjustment ranges........................................................ 28
Alarms............................................................................................ 29
How to lock the parameters ........................................................... 30
HOW THE CONTROLLER OPERATES ............................................ 31
TROUBLESHOOTING ....................................................................... 34
TECHNICAL SPECIFICATIONS ........................................................ 37
FOR CUSTOMER USE
This controller has a serial number
located on the side of the enclosure.
Pleaserecordthisnumberandretain
it for your records.
Model number
Serial number CVS-21HA

CVS-21HA.rev.03 3
The CVS-21HA controls two stages of variable speed fans as well as two
stages of either constant speed fans or heating units.
The main features of the controller are as follows:
ATHREE DIGIT DISPLAY allows you to specify temperatures to within
one tenth of a degree (Celsius or Fahrenheit).
PILOT LIGHTS indicate the state of outputs, allowing you to monitor
the operation of the system without having to enter the room.
Up to FOUR INDEPENDENT TEMPERATURE PROBES can be con-
nected to the controller in order to obtain a more accurate reading of
the average room temperature and a faster reaction time.
A TEMPERATURE CURVE comprised of six different points provides
an automatic adjustment of the target room temperature over a given
period of time.
A MINIMUM SPEED CURVE comprised of six different points provides
an automatic adjustment of the first stage minimum speed over a given
period of time.
A MINIMUM VENTILATION CYCLE allows you to operate the fans
continuously or intermittently when ventilation is not required for a
cooling purpose. This reduces the level of humidity and supplies oxy-
gen to the room. It also prevents the fans from freezing in the winter.
You can choose from among TEN DIFFERENT MOTOR CURVES to
ensure that the controller supplies the correct voltage to the fan motors.
This feature provides a high degree of compatibility between controller
and fan motor.
Fuses located at the input and outputs of the controller provide
OVERLOAD AND OVERVOLTAGE PROTECTION and a connector
allows you to detect blown fuses.

4 CVS-21HA.rev.03
The controller supplies MAXIMUM VOLTAGE DURING 2 SECONDS
at every variable speed fan start-up, in order to overcome the inertia
of the ventilation system components and de-ice the fan blades in cold
weather conditions.
When used with a computer communication module, the controller
COMMUNICATES WITH A COMPUTER.This makes possible thecen-
tralization of information management and a more diversified control
stategy.
When used in combination with a WR-F-1A controller, the CVS-21HA
COORDINATES THE MOVEMENT OF THE AIR INLETS WITH THE
OPERATION OF THE FANS. This allows the air inlets to be adjusted
correctly, free of the influence of noncontrollable factors such as wind
or air from adjoining rooms.
ThecontrollergeneratesanoutputsignalthatwillactivateanyALARM
system in case of a rise or fall in temperature beyond a specified limit,
a power failure or a fault in the supply circuit.
A DE-ICING CYCLE is provided for de-icing stage 2 variable-speed
fans in cold weather conditions.

CVS-21HA.rev.03 5
Incaseofasystemfailure, we strongly recommend that you install an
alarm system as well as a natural ventilation system in the room. We
also recommend that you install a back-up thermostat on at least one
cooling stage (to connect the thermostat, refer to the wiring diagram
enclosed with this user's guide).
Fuses on the input and outputs of the controller provide overload
andovervoltageprotection.Tofurtherprolongthelifeofthecontroller,
werecommendthat you installanadditional protection deviceonthe
supply circuit as well as an external relay on all ON/OFF stages.
TheroomtemperaturewherethecontrollerisinstalledMUSTALWAYS
REMAIN BETWEEN 32° ET 104°F (0° ET 40°C).
To avoid exposing the controller to harmful gases or excessive
humidity, it is preferable to install it in a corridor.
DO NOT SPRAY WATER ON THE CONTROLLER

6 CVS-21HA.rev.03
SET
LOCATION OF THE CONTROLS
Cover
Internal circuit
ON

CVS-21HA.rev.03 7
THREE DIGIT DISPLAY
Displays temperatures and other parameters shown around the
parameter selection knob.
STAGE 1 PILOT LIGHT
Turns on when the stage 1 fans are on.
STAGE 2 PILOT LIGHT
Turns on when the stage 2 fans are on.
STAGE 3 PILOT LIGHT
Turns on when the stage 3 fans or heating units are on.
TEMPERATURE CURVE PILOT LIGHT
Turnson whenthe temperaturecurveisactivated.Flasheswhenthe
temperature curve is activated and the minimum speed curve is in
operation.
DEFECTIVE PROBE PILOT LIGHT
Turns on when a defective probe is detected.
ALARM PILOT LIGHT
Turns on when the controller activates the alarm.
LOCKED PARAMETER PILOT LIGHT
Turns on when the parameters are locked.
PARAMETER SELECTION KNOB
Use this selection knob to select a parameter.
PUSH-BUTTON
Usethispush-buttontoselectamotorcurveandtovieworsetthe
points of the temperature and minimum speed curves.
ADJUSTMENT KNOB
Usethisadjustmentknobtoadjustthevalueoftheselectedparameter.
1
2
3
4
5
6
7
8
9
10
11

8 CVS-21HA.rev.03
SWITCHES
Use these switches to set the operating modes as described in the
table below.
12
Activated probe
Deactivated probe
DESCRIPTION
TEMPERATURE
UNITS
PROBE # 2
PROBE # 3
PROBE # 4
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OPERATING MODE
Locked parameters
Unlocked parameters
Degrees Celsius
Degrees Fahrenheit
Activated probe
Deactivated probe
Activated probe
Deactivated probe
1
2
3
4
5
#
6
LOCKING
THE PARAMETERS
SWITCH
POSITION
7
COOLING
OR HEATING ON
OFF Stage 3 used for heating
Stage 3 used for cooling

CVS-21HA.rev.03 9
MOUNTING THE CONTROLLER
Open the latch and lift the cover. Remove the black caps located on each
of the four mounting holes. Mount the enclosure to the wall using four
screws. Insert the screws into the mounting holes and tighten. Fasten the
black caps onto the mounting holes.
CONNECTING THE EQUIPMENT
To connect the fans and heating units to the controller, refer to the wiring
diagram enclosed with this user's guide.
Setthevoltageswitchlocatedinsidetheenclosuretotheappropriate
line voltage.
Usetheelectricalknockoutsprovidedatthebottomoftheenclosure.
Do not make additional holes in the enclosure, particularly on the
side of the enclosure when using a computer communication
module.
If metallic cable holders are used to secure cables entering the
enclosure,usethegroundplateprovidedwiththecontroller.Connect
the ground wire to the ground stud on the plate.
Whenconnectingheatingunitstothecontroller,itmaybenecessary
to install a transformer in order to adapt the voltage to the heating
units.
ALLWIRING MUSTBE DONEBYAN AUTHORIZEDELECTRICIAN
AND MUST COMPLY WITH APPLICABLE CODES , LAWS AND
REGULATIONS. BE SURE POWER IS OFF BEFORE DOING ANY
WIRING TO AVOID ELECTRICAL SHOCK AND EQUIPMENT
DAMAGE.
CONCERNING THE ALARM CONNECTION: There are two types of
alarms in the industry. One type activates when current is cut off at its
input, whereas the other activates when current is supplied at its input. For
an alarm of the first type, use the NO terminal as shown in the wiring dia-
gram. For an alarm of the second type, use the NC terminal.

10 CVS-21HA.rev.03
CONNECTING THE PROBES
To extend the probes:
Each probe can be extended up to 500 ft (150 m). To extend a probe:
Use a shielded cable with an outside diameter between 0.245
and0.260in(6.22and 6.60mm)(thecabledimensionmustnotbe
under 18 AWG) to ensure the cable entry is liquid-tight. Do not
ground the shielding.
It is preferable to solder the cable joint to ensure a proper contact
betweenthetwocables.
CAUTION: Do not run probe cables next to other power cables. When
crossing over other cables, cross at 90°.
Activate each additional probe by
settingtheappropriateswitchtoON:
Switch # 3 activates terminal # 2.
Switch # 4 activates terminal # 3.
Switch # 5 activates terminal # 4.
FACTORY SETTING: When the controller is shipped from the factory,
switches # 3, 4 and 5 are set to OFF (probes are deactivated).
To connect the probes:
The controller is supplied with one probe connected to terminal #1. Up to
three additional probes can be connected to the controller.
Use terminals # 2, 3 and 4 to connect the additional probes as
shown on the wiring diagram enclosed with this user's guide.
CAUTION: The probes operate under low voltage and are isolated
fromthesupply.Be sure theprobecablesremainisolatedfrom all high
voltagesources.Inparticular,donotroutetheprobecablesthroughthe
same electrical knockout as other power cables.
3
ON
4 5

CVS-21HA.rev.03 11
Defective probes:
Ifadefectiveprobeisdetected,thedefectiveprobepilotlightturnson.The
room temperature shown on the display will then be the average value of
alltemperaturesmeasuredbytheprobesremaininginproperconditionand
the controller will operate according to this temperature.
To determine which probe is defective:
Setthe parameter selection knob
to ROOM TEMPERATURE. The
roomtemperatureappearsonthe
display.
Press the push-button. If the
probe connected to terminal #1
(supplied with the controller) is
notdefective,theword"PR1"and
thetemperaturemeasuredby the
probe will alternately appear on
the display. If the probe connected to terminal #1 (supplied with
the controller) is defective, the word "PR1" and the letter "P" will
alternately appear on the display.
For each additional probe connected to the controller:
Press the push-button once again. If the probe is not defective,
the word "PR#" (# is the number of the terminal to which the
probe is connected) and the temperature measured by the probe
will alternately appear on the display. If the probe is defective, the
word "PR#" and the letter "P" will alternately appear on the
display.
SELECTING THE OPERATING MODE FOR
STAGE 3
Stage 3 can be used for cooling or heating.
MIN. MAX.
ROOM TEMPERATURE
OTHER
FUNCTIONS

12 CVS-21HA.rev.03
To select the operating mode:
Set switch # 6 to the required position:
Stage 3 used for heating:
set switch # 6 toON.
Stage 3 used for cooling:
set switch # 6 toOFF.
FACTORY SETTING: When the controller is shipped from the factory,
switch # 6 is set to OFF (stage 3 used for cooling).
SELECTING MOTOR CURVES FOR THE
VARIABLE SPEED STAGES
The relationship between the voltage supplied to a variable speed motor
and the speed it develops is described by a motor curve. This curve
varies with the make and capacity of the motor. The variable speed
motors available in the industry have been grouped into ten categories
and the controller is programmed with a different motor curve for each of
these categories. Selecting an appropriate curve for each of the variable
speed stages will ensure that the controller supplies the correct voltage to
the fan motors.
To select a motor curve for stage 1:
Inthelistofmotorsenclosedwiththisuser'sguide,locatethemake
andcapacityofthemotorsyouareusingandnotethecorresponding
curve number.
Set the parameter selection knob to BANDWIDTH/M.C.-STAGE 1.
The stage 1 band width appears flashing on the display.
Press the push-button. The currently selected curve number
appears flashing on the display.
Turntheadjustmentknobtoadjustthecurvenumbertothedesired
value.
6
ON

CVS-21HA.rev.03 13
Return to the stage 1 band width display either by pressing the
push-buttonorbywaiting10secondswithoutchangingtheposition
of the adjustment knob.
HOW TO SELECT A TEMPERATURE UNIT
Temperatures can be displayed in degrees Celsius or Fahrenheit.
Set switch # 2 to the desired position:
ON : degrees Celsius.
OFF : degrees Fahrenheit.
FACTORY SETTING: When the controller is shipped from the factory,
switch #2issettoOFF(temperaturesaredisplayedindegreesFahrenheit).
The display flashes certain values and does
notflashothers.Theflashingindicatesthatthe
value on the display can be adjusted. Values
that are not flashing can not be adjusted.
VALUES FLASHING ON THE DISPLAY
To select a motor curve for stage 2:
Repeat the steps described for stage 1, this time setting the
parameter selection knob to BANDWIDTH/M.C. - STAGE 2.
FACTORYSETTING:Whenthecontrollerisshippedfromthefactory,curve
number 4 is selected for both stage 1 and stage 2.
2
ON

14 CVS-21HA.rev.03
To view the room temperature and the
temperature measured by each probe:
Settheparameterselectionknob
to ROOM TEMPERATURE. The
roomtemperatureappearsonthe
display.
The room temperature shown on the
display is the average value of all
temperatures measured by probes
that are activated and in proper
operating condition.
Press the push-button. The word "PR1" and the temperature
measured by the probe connected to terminal # 1 (supplied with
the controller) alternately appear on the display.
For each additional probe connected to the controller:
Pressthepush-buttononceagain.Theword"PR#"(#isthenumber
oftheterminaltowhichtheprobeisconnected)andthetemperature
measured by the probe alternately appear on the display.
HOW TO VIEW AND RESET TEMPERATURES
To view the minimum and maximum temperatures:
SettheparameterselectionknobtoROOMTEMPERATURE.The
room temperature appears on the display.
Turn the adjustment knob clockwise by one notch. The minimum
temperature appears flashing on the display.
Turn the adjustment knob clockwise one notch further. The
maximum temperature appears flashing on the display.
Turn the adjustment knob clockwise a third notch. The room
temperature again appears on the display.
MIN. MAX.
ROOM TEMPERATURE
OTHER
FUNCTIONS

CVS-21HA.rev.03 15
If the adjustment knob is turned counterclockwise rather than
clockwise,thedisplaysequencewillbereversed(room-maximum-
minimum-room).
The minimum and maximum temperatures are the lowest and highest
values of all room temperatures measured since the last reset.
To reset the minimum and maximum temperatures:
SettheparameterselectionknobtoROOMTEMPERATURE.The
room temperature appears on the display.
Turn the adjustment knob clockwise (or counterclockwise) by one
notch and leave it in this position. The minimum (or maximum)
temperaturefirstappearsflashingonthedisplay.After10seconds,
thedisplaystopsflashingandtheroomtemperatureagainappears
on the display, indicating that the reset is completed.
When the minimum and maximum temperatures are reset, their current
valuesareerasedfrommemoryandthecontrollerbeginstostoreinmemory
new values measured from that moment on.
NOTE : Toavoidresettingthe minimum and maximum temperatures while
viewing them, be sure to return to the room temperature display within the
10 second delay.
PARAMETER DESCRIPTIONS
SET POINT / TEMPERATURE CURVE
The controller maintains a specified
target room temperature by controlling
the operation of the fans and heating
units. The target room temperature can
be specified in two ways:

16 CVS-21HA.rev.03
1 - With a single set point
When a single set point is specified and the temperature curve is
not activated, the controller considers this set point as the target room
temperature.
2 - With a temperature curve
When a temperature curve is specified and activated, the controller
automatically adjusts the target room temperature over a given period of
time. The temperature curve is comprised of six points. A day number as
well as a set point for this day number must be specified for each of the
six points. When the temperature curve is activated, the controller adjusts
the target room temperature every hour in a linear fashion between two
consecutive points. When the last point of the curve is reached, the
temperaturecurve becomes deactivated.The controller maintainsthe last
set point of the curve until the curve is reactivated or until a new single set
point is specified.
STAGE 1 (VARIABLE SPEED FANS)
Minimum ventilation cycle:
When ventilation is not required for a cooling
purpose, the stage 1 fans operate according to
the minimum ventilation cycle.
STAGE 1 —MIN. SPEED
OFF
TIME ON
STAGE 1
TIME OFF
STAGE 1

CVS-21HA.rev.03 17
Time on [seconds] - When the stage 1 fans operate according to the
minimum ventilation cycle, they run during time on.
Time off [seconds] - When the stage 1 fans operate according to the
minimum ventilation cycle, they stop running during time off.
The fans can be set to operate in three different ways:
1 - To run the fans continuously: set time off to zero and time on to any
value other than zero.
2 - To run the fans intermittently: set time on to the desired running time
and time off to the desired off time.
3 - To stop the fans: set time on to zero and time off to any value (equal
to or other than zero).
Minimum speed / curve [% of the full speed of the fans] - When the stage 1
fans operate according to the minimumventilationcycle, they run atmini-
mum speed. This speed can be specified in two ways:
1 - With a single minimum speed
Whenasingle minimumspeedisspecifiedand the minimum speed curve is
deactivated or the minimum speed curve is activated but not effectively in
operation, the stage 1 fans run at this speed.
2 - With a minimum speed curve
When a minimum speed curve is specified and activated, the controller
automatically adjusts the stage 1 minimum speed over a given period of
time. The minimum speed curve is comprised of six points. A day number
as well as a minimum speed for this day number must be specified for
each of the six points. When the minimum speed curve is activated, the
controller adjusts the stage 1 minimum speed every hour in a linear
fashion between two consecutive points.

18 CVS-21HA.rev.03
d5
d10
TEMPERATURE CURVE MINIMUM SPEED CURVE
d5 to d9 (adjustable)
d10 (not adjustable)
POINT 1
POINT 2
However, if the room temperature falls below the following values:
(1) Stage 3 is used for cooling: "set point - 5°F (2.8°C)"
(2) Stage 3 is used for heating:
"set point - 5°F (2.8°C) - heater offset - differential 3"
or
"set point" if the preceding value is greater than the set
point
the fans will begin to run at the minimum speed specified for the first point
of the curve and will continue to do so as long as the room temperature
remains below the set point. When the room temperature rises above the
set point, the fans will return to the current minimum speed.
When the last point of the curve is reached, the curve becomes deacti-
vated. The controller maintains the last minimum speed of the curve until
the curve is reactivated or until a new single minimum speed is specified.
The minimum speed curve and the temperature curve are related in the
following ways:
The minimum speed curve can be activated only if the temperature
curve is already activated.
All points of the minimum speed curve, other than the first one, are
automatically given day numbers identical to those specified for the
temperaturecurve. Only thefirst point ofthe minimum speedcurve has
anadjustable day number.This day number mustbe higher or equalto
the day number specified for the first point of the temperature curve
and lower that the day number specified for the second point of the
temperature curve.
For example:

CVS-21HA.rev.03 19
When the minimum speed curve is activated, it will effectively be in
operation (i.e. the controller will begin to adjust the minimum speed
according to the specified points of the curve) only when the current
day number of the temperature curve reaches the first day number of
the minimum speed curve.
For example:
Bandwidth [°F or °C] - The stage 1 bandwidth is the variation in the room
temperature between the moment the stage 1 fans run at minimum speed
and the moment they reach full speed.
Variable speed ventilation:
When ventilation is required for a cooling purpose,
the stage 1 fans stop operating according to the
minimum ventilation cycle. The fans start to operate
continuously and their speed varies according to
the room temperature.
POINT 1
POINT 2
d5
d10
90.0 °F
85.0 °F
10 %
20 %
If you activated the temperature curve yesterday, the current day
number of the temperature curve is d6. Therefore, if you activate the
minimum speed curve today, it will effectively be in operation only
tomorrow, when the current day number of the temperature curve
reaches d7. In the meantime, the fans will run at the specified
single minimum speed.
If you activated the temperature curve three days ago, the current
day number of the temperature curve is d8. Therefore, if you activate
the minimum speed curve today, it will effectively be in operation the
moment you activate it. In this case, the current minimum speed will
be a value between 10% and 20%.
d7
d10
Temperature
Day number Day number Speed
MINIMUM SPEED CURVETEMPERATURE CURVE

20 CVS-21HA.rev.03
STAGE 2 (VARIABLE SPEED FANS)
Minimum speed [% of the full speed of the fans]
-The stage 2minimumspeed is thespeed at which
the stage 2 fans start to run and return to a stop.
Bandwidth [°F or °C] - The stage 2 bandwidth is the variation in the room
temperature between the moment the stage 2 fans run at minimum speed
and the moment they reach full speed.
DE-ICING OF STAGE 2 FANS
Ade-icingcycle is provided toallowde-icing of stage 2 fansincold weather
conditions. A cycle is defined to start stage 2 fans periodically. When the
cycle time has elapsed, the stage 1 fans are stopped. The stage 2 fans
are started at full speed and then operated at the stage 2 minimum speed
during a user-defined time. Then, stage 2 fans are turned off and opera-
tion of stage 1 fans is resumed at the appropriate speed.
De-icing Cycle Time [in minutes] - The stage 2 de-icing cycle time is the
time lapse between de-icing operations.
De-icing Time On [in seconds] - The stage 2 de-icing time on is the time
stage 2 fans are turned on during de-icing operations.
STAGE 3 (EITHER CONSTANT SPEED FANS OR
HEATING UNITS)
Differential [°F or °C] - The stage 3 differential is
the variation in the room temperature between the
moment the stage 3 fans or heating units turn on
and the moment they turn off.
Heater offset [°F or °C] - The stage 3 heater offset is the number of
degrees between the set point and the room temperature at which the
stage 3 heating units turn off. When the heater offset is activated, it can be
adjusted to a positive or negative value. When the heater offset is deacti-
vated, it can be adjusted only to a positive value.
HEATER OFFSET
DIFF.
STAGE 3