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