WattMaster VAV WMVAV Controller Technical Guide
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WMVAV Controller
Technical Guide
Table Of Contents
Controller Overview ......................................................................................................................................... 3
Features ..................................................................................................................................................................................... 3
Controller Inputs and Outputs ......................................................................................................................... 5
General ....................................................................................................................................................................................... 5
WMVAV Controller Analog Inputs: ............................................................................................................................................... 5
Expansion Board Analog Inputs ................................................................................................................................................. 6
WMVAV Controller Analog Outputs ............................................................................................................................................. 6
Expansion Board Analog Output ................................................................................................................................................ 6
WMVAV Controller Relay Outputs ............................................................................................................................................... 6
Expansion Board Relay Outputs ................................................................................................................................................ 7
Expansion Board Binary Inputs ................................................................................................................................................. 7
Controller Installation & Wiring ....................................................................................................................... 7
General ....................................................................................................................................................................................... 7
Controller Mounting .................................................................................................................................................................... 7
Important Wiring Considerations .............................................................................................................................................. 7
Remote Forced Mode Settings .................................................................................................................................................. 7
Expansion Board Installation & Wiring ........................................................................................................... 9
Jumper Settings ......................................................................................................................................................................... 9
Wiring Considerations ............................................................................................................................................................. 10
Wiring Details ................................................................................................................................................. 11
Space Temperature Sensor ...................................................................................................................................................... 11
Supply & Return Temperature Sensor ...................................................................................................................................... 11
Outside Air Temperature Sensor ............................................................................................................................................. 12
Remote Occupied Contact ....................................................................................................................................................... 12
Humidity Sensor ....................................................................................................................................................................... 13
Supply Fan VFD Signal ............................................................................................................................................................ 13
Relief Fan VFD Signal Wiring .................................................................................................................................................. 14
Relief (Building) Pressure Sensor .......................................................................................................................................... 14
CO2 Sensor ............................................................................................................................................................................. 15
Supply Setpoint Reset .............................................................................................................................................................. 15
Start-up & Commissioning ............................................................................................................................ 16
Controller Addressing .............................................................................................................................................................. 16
Power Wiring ............................................................................................................................................................................ 16
Initialization: .............................................................................................................................................................................. 17
Programming The Controller ................................................................................................................................................... 17
Sequence Of Operations ............................................................................................................................... 18
Initialization ............................................................................................................................................................................... 18
WMVAV Configuration & Setup ................................................................................................................................................. 18
Other Control Options .............................................................................................................................................................. 18
Scheduling ............................................................................................................................................................................... 19
Occupied/Unoccupied Mode .................................................................................................................................................... 20
Main Fan Control ...................................................................................................................................................................... 20
HVAC Mode Calculation ........................................................................................................................................................... 20
Static Pressure & Fan VFD Control .......................................................................................................................................... 24
Relief Pressure & VFD Control ................................................................................................................................................ 24
Exhaust Fan Control ................................................................................................................................................................. 24
Hot Gas Re-Heat And
Dehumidification Control (If Available) ..................................................................................................................................... 24
Preheat Operation .................................................................................................................................................................... 25
Air to Air Heat Pump ................................................................................................................................................................. 25
Alarm Detection and Reporting ............................................................................................................................................... 25
Force Modes or Overrides ........................................................................................................................................................ 26
Internal Trend Logging ............................................................................................................................................................. 26
VAV Box Compatibility ............................................................................................................................................................... 26
Troubleshooting ............................................................................................................................................. 27
Using LED’s To Verify Operation .............................................................................................................................................. 27
Appendix ........................................................................................................................................................ 28
Technical Guide
Controller Overview
Features
The WMVAV Controller Board is designed with 7 usable analog inputs,
2 analog outputs and 5 relay outputs. The controllers input and output capabilities can be expanded by use of either 2 slot or 4 slot expansion boards that plug into the WMVAV Controller by means of a modular cable. The WMVAV Controller can be configured for control of VAV
Units (with or without VAVBOX Controllers), Constant Volume Units and Air to Air Heat Pump Units. Features include the following:
•
Up to 8 Stages of Cooling (4 on board, 4 more with expansion board)
•
Up to 8 Stages of Heating (4 on board, 4 more with expansion board)
•
Selectable Control Sensor
•
Fan Proving Interlock
•
Wetbulb Control of Economizer Operation
•
Accepts Remote Occupied Signal
•
Relief Pressure Control
•
De-Humidification Capable
•
Full Economizer Control
•
I.A.Q. Control with C0
2
Sensor Monitoring
•
7 Day, 2 Event per Day Scheduler Built In
•
14 Day Holiday Scheduler Built In
•
Optimal Start Scheduling Built In
•
Override from Occupied to Unoccupied Mode
•
Internal Trend Logging
•
Supply Air Reset Capability
•
Accepts Remote HVAC Mode Selection Via Contact
Closure On Expansion Input Board
Most HVAC unit control configurations can be configured with the standard WMVAV Controller. If the application requires more inputs and/or outputs, optional relay expansion boards are available from the factory to provide for additional analog, binary or digital inputs and outputs as required. These expansion boards are installed on either a 2 slot or 4 slot expansion base board that connects to the WMVAV
Controller board via a modular cable connection.
The available expansion board configurations allow for 4 additional binary inputs, 4 additional analog inputs, 1 additional analog output, and up to 16 additional binary (relay) outputs. The various expansion boards connect to the expansion board base. Jumpers must be set according to the board type installed. Up to 4 Relay Output Expansion
Boards can be installed on the expansion base board connected to the controller.
.20 Dia.
Typ. of 4
6.2“
7.3”
U3
CX1
1
RN1
U1
U2
CX2
U4
CX4
TB1
COMM
T
SHLD
R
CX5
U5
LD6
COMM
LD7
PWR
1
RS-485
COMM
HH
LD8
LED1
R1
C1
LD9
LED2
U7
RV1
P1
+VREF
5.11V
TEST POINT
VREF ADJ
EWDOG
R28
INPUTS
ADDRESS
TB3
+VDC
AIN1
RN5
AIN2
AIN3
AIN4
AIN5
GND
GND
C10
AOUT1 C12
AOUT2
AIN7
GND
PJ1
C17
D15
PU1
D6
PU2
D7
PU3
D8
PU4
D9
PU5
D11
PU7
D14
U13
SW1
CX13
U15
U6
ADD
1
2
4
8
16
32
TOKEN
NETWORK
JP1
X2
U10
CX10
R15
C14
R19
U14
U12
CX14
C15
R22
R24
R25
C20
RAM
CX15
EPROM
TUC-5R PLUS
(1 MEG)
YS101816 REV. 2
CX6
CX12
1
U9
PAL
1
C7
D12
R13
SC1
D19
L1
PRESSURE
SENSOR
R26
EXPANSION T'STAT
VR1 VR2
6.7”
Figure 1: WMVAV Controller Dimensions
V1
V2
V3
COM1-3
R1
R2
R3
R4
R5
COM4-5
TB2
V4
V5
U8
R6
C9
C13
C16
TB4
GND
24VAC
WMVAV Controller
6.6”
3
Technical Guide
Controller Overview
2.12
4.24
0.28
4.00
D3
R14
PWR LD1
D3
R20
PWR LD1
4.73
LM358N
I/O
YS101780
TMODULAR LO 2S
R5
R6
R4
R3
R2
R1
5.40
5.96
9.52
LM358N
R13
R14
D2
D1
P82B715P
R2
R3
R1
8.29
8.96
4.00
2 Slot Expansion
Base Board
R10
R11
R12
0.28
2.12
4.24
4 Slot Expansion
Base Board
Figure 2: Expansion Base Boards Dimensions
1.67
4 Analog Input
1 Analog Output Board
4.00
CX2
Q1 Q1
U2
TB1
4.24
PCF8591P PCF8591P
P1
1.67
TB1
P2506-2
4.00
C4
C3
C2
C1
74HC14N
PCF8574P
P2506-2
4.24
4 Binary Input Board
P1
1.67
4.00
K3
K4
V4
V1
TB1
K1
K2
4.24
4 Relay Output Board
4
Figure 3: Expansion Boards Dimensions
U3
CX2
CX1
P1
WMVAV Controller
Technical Guide
RS-485
Communications
Loop Connection
RS-485
Communications
Driver Chip
Comm
LED
Power
LED
Not
Diagnostic
Used
Blink Code
LED
Pull-up Resistors
For Analog Inputs
Analog Input
And Output
Terminal Block
Pressure Sensor
Modular Service
Tool - Mini Din
Connector
(AIN6 Modular Connection)
Typical
Pin 1
Indicator
RAM
Chip
EPROM
Chip
U3
1
RN1
CX1
U1
U2
CX2
U4
CX4
TB1
COMM
T
SHLD
R
CX5
LD6
COMM
LD7
PWR
1
U5
RS-485
COMM
HH
RAM EPROM
TUC-5R PLUS
(1 MEG)
YS101816 REV. 2
LD8
LED1
R1
C1
LD9
LED2
P1
+VREF
5.11V
TEST POINT
U7
RV1
VREF ADJ
EWDOG
R28
INPUTS
TB3
+VDC
RN5
AIN1
AIN2
AIN3
AIN4
AIN5
GND
C10
GND
AOUT1 C12
AOUT2
AIN7
GND
PJ1
C17
D15
C20
PU1
D6
PU2
D7
PU3
D8
PU4
D9
PU5
D11
PU7
D14
ADDRESS
SW1
ADD
1
2
4
8
16
32
TOKEN
NETWORK
JP1
X2
U13
CX13
U15
CX15
U6
U10
CX10
R15
C14
R19
U14
U12
CX14
C15
R22
R24
R25
CX6
CX12
1
U9
PAL
C7
1
D12
R13
SC1
D19
PRESSURE
SENSOR
R26
EXPANSION T'STAT
VR1
L1
VR2
PAL
Chip
COM1-3
R1
R2
R3
R4
R5
COM4-5
TB2
V4
V5
V1
V2
V3
U8
R6
C9
C13
C16
TB4
GND
24VAC
Real Time
Clock Chip
Expansion Board
(Modular Connection)
Figure 4: WMVAV Controller Component Locations
Not Used
Mounting Hole
Typ of 4
Mounting
Backplate
Relay Output
Terminal Block
Address Switch
EEPROM
24 VAC
Power Input
Controller Inputs and Outputs
General
The following inputs and outputs are available on the WMVAV controller and/or the various expansion boards that can be added to the main controller board expansion port. For component locations of the inputs on the WMVAV Controller see Figure 4. For wiring of inputs and outputs see Figure 5 and 6.
WMVAV Controller Analog Inputs:
Input #1: Space Temperature
The space temperature can be used for night setback control or it can be configured as the main control source instead of the default Supply Air
Temperature. If the optional push-button override sensor is installed, this input will detect user overrides from unoccupied back to occupied operation for a user adjustable amount of time. This sensor is not required if this is a cooling only air handler that doesn’t require night setback operation. The space temperature can also be configured to reset the Discharge Air Temperature Setpoint.
Input #2: Supply Air Temperature
The supply air is the default control source. This temperature is maintained at the Supply Air Cooling Setpoint during occupied hours of operation and during the Cooling Mode. If the unit is in Warm-Up or
Heating Mode, a separate Supply Air Heating Setpoint is maintained.
The air handler must always have a supply sensor installed.
WMVAV Controller
5
Technical Guide
Controller Inputs and Outputs
Input #3: Return Air Temperature
The return air is used to initiate and cancel the morning warm-up period.
This sensor can also be selected as the controlling temperature in place of the supply air or space temperature. If the return air is the controlling sensor, it can be configured for cooling only operation or it can also generate an occupied heating mode of operation. The Space Temperature Sensor must be installed for night setback operation. The Return air temperature cannot be used for night setback since air may stagnate in the return duct or plenum and may or may not reflect the actual temperature in the building or space being controlled by the air handler.
IIIIInput #4 - Outdoor Air Temperature
The outdoor air temperature is used to lockout heating or cooling to conserve energy at whatever temperature the user deems appropriate for each mode of operation. The outdoor air can also be used to provide low ambient protection in the building. If the outdoor air is below a low ambient setpoint, the Preheat Relay Output will be maintained during occupied operation and will not be allowed to stage off unless the main fan is turned off. The outdoor air temperature is also used as an economizer enable input.
Input #5 - Outdoor Air Humidity Or
Remote Occupied Signal
Depending on how the user configures their system, this input can be used for an outdoor air humidity sensor that, combined with the outdoor air temperature, is used to calculate a Wetbulb Temperature for the purpose of Economizer Control. This input can also be configured to monitor a contact closure from another building automation system that indicates that the equipment should be operating in the occupied mode.
If the remote occupied signal is being monitored, you must program all the internal schedules to be zero for both the start and stop times on every day of the week. If both an Outdoor Air Humidity Sensor and a
Remote Occupied Signal Input are required, the Remote Occupied Signal Input should be connected to the 4 Analog Input Expansion Board terminal #2.
Input #6 - Static Pressure Sensor Input
This special phone jack input accepts a standard pressure transducer used to calculate the Duct Static Pressure. This static pressure reading is used to control the Fan VFD signal. If you have configured the air handler for Constant Volume operation, this sensor is optional. If it is installed it will not affect operation; it will be used as a status only reading.
Input #7 - Fan Proof of Flow Switch
A Proof of Flow Switch that provides a contact closure whenever the fan is operating correctly can be monitored on this input. If this contact opens while the fan is on, all heating and cooling is suspended. This is an optional item. If a switch is installed, the user must configure the
WMVAV controller to utilize the signal. Input #7 can also be used to connect the slide adjust wiring when a room sensor with the slide adjust option is used.
Expansion Board Analog Inputs
Input #1 - Supply Setpoint Reset
This input can be configured to read a 0.0-5.0 or 0 – 10.0 VDC signal.
via jumper settings on the expansion board. See Figure 6. The maximum setpoint is created by adding the reset limit to the Supply Air
6
Setpoint. The Supply Air Setpoint is proportionally reset from its minimum value at 0 VDC to its maximum value at full scale voltage.
Input #2 - Remote Occupied Contact
If you configured Input #5 on the WMVAV controller board as a humidity sensor, you can move the remote occupied contact closure to this input.
Input #3 - Carbon Dioxide
This sensor is required if you need to monitor Indoor Air Quality and modify the Economizer operation based on levels of CO
2 in the space or building you are monitoring.
Input #4 - Relief Pressure Sensor
This sensor is required only when you configure the WMVAV controller to control building / relief pressure. This sensor must provide a 0-5.0
VDC signal over a range of ±0.25” Water Gauge. Output control is provided in two manners. The first output control method uses the analog output on the Analog Input Expansion Board to provide a 0-10
VDC signal for control of VFD equipped relief / exhaust fans. As an alternative, you can configure one of the output relays as an exhaust fan output that will activate anytime the relief pressure is above the programmed setpoint. Remove pull up resistor PU4 and jumper J04 on expansion board.
Note: All temperature sensors must be Thermistor Type III which provide 77.0°F @ 10 K Ohms Resistance.
WMVAV Controller Analog Outputs
Output #1 - Economizer Signal
This 2.0 to 10.0 VDC signal is used to position the outside air dampers during economizer controls, or to maintain the dampers at a minimum position during occupied mode when the outdoor air temperature and / or humidity is not suitable for free cooling.
Output #2 - Supply Fan VFD Signal
This 0 to 10.0 VDC signal can be connected to a VFD fan speed controller or to proportional inlet vanes to control the Duct Static Pressure.
Expansion Board Analog Output
Output #1 - Relief Fan VFD Signal
Located on the 4 Analog Input 1 Analog Output Expansion Board. This
0 to 10.0 VDC signal can be connected to a Variable Frequency Drive fan speed controller to control the Building Static Pressure.
WMVAV Controller Relay Outputs
Relay #1 - Fan (Enable)
This is a non-configurable output.
Relay #2 - #5 Configurable Relays
These relays are located on the WMVAV Controller. For configuration order and options see the following information.
WMVAV Controller
Technical Guide
Expansion Board Relay Outputs
Relay #6 – #21 Configurable Relays
These relays are available by using Relay Expansion boards connected to the WMVAV controller. Relays can be configured in any order but we recommend that they be configured in the following order:
1. Heating (aux. heating) stages
2. Cooling (compressor) stages
3. Warm–up Mode command for Boxes
4. Reversing Valve for Air to Air Heat Pumps
5. Reheat Control for De-Humidification
6. Exhaust Fan
7. Pre-Heater for Low Ambient protection
8. Economizer Mode
9. Alarm
10. Ovveride
11. Occupied Mode
You can have up to 8 stages of Heating (aux. heating) and 8 stages of
Cooling (compressors). You may also utilize 1 relay output each on the
WMVAV controller board for items 3 thru 11 above.
Expansion Board Binary Inputs
Input #1 - Humidistat Contact
This input is required for the dehumidification option.
This input is required for Filter Status Indication
This input is used to allow another control system to force the unit into heating or vent modes as indicated. See Force Mode Setting Notes information below.
This input is used to allow another control system to force the unit into cooling or vent modes as indicated. See Remote Force Mode Setting
Notes information that follows.
Remote Forced Mode Settings
Remote Forced Heating or Cooling Modes require that the user enter zero values for both the Heating and Cooling Setpoints. The Unit Controller will then look for contact closures on the Forced Cooling Mode and Forced Heating Mode inputs to operate the Air Handling Unit. If both the Forced Heating and Forced Cooling Modes are active the unit will operate in Vent Mode. The unit may also be operated in Vent Mode by providing a contact closure to the Remote Occupied Input.
Note: The Binary Inputs require wet contacts (24 VAC) to recognize an active input. If you provide dry contacts, the
Controller Installation & Wiring
General
Correct wiring of the WMVAV controller is the most important factor in the overall success of the controller installation process. The WattMaster VAV controls are purchased from WattMaster Controls for installation in the field. The information below gives guidelines and important considerations for field mounting and wiring.
Controller Mounting
It is important to mount the controller in a location that is free from extreme high or low temperatures, moisture dust and dirt. It is recommended that it be installed in the HVAC unit control panel. If this is not practical, it should be mounted in a separate control enclosure that is weathertight. Be careful not to damage the electronic components when mounting the controller. Remove the controller from its backplate. Mark the control enclosure base using the backplate as a template. Drill pilot holes in the enclosure base and secure the backplate to it using sheet metal screws. Do not allow metal shavings to fall onto the circuit board.
Reattach the controller to the backplate.
Important Wiring Considerations
Please carefully read and apply the following information when wiring the WMVAV controller. See Figure 5 for WMVAV controller wiring diagram.
1.
All 24 VAC wiring must be connected so that all ground wires remain common. Failure to follow this procedure can result in damage to the controller and connected devices.
WMVAV Controller
2.
All wiring is to be in accordance with local and national electrical codes and specifications.
3.
Minimum wire size for 24 VAC wiring should be 18 gauge.
4.
Minimum wire size for all sensors should be 24 gauge.
Some sensors require 2 conductor wire and some require 3 conductor.
5.
Be sure that all wiring connections are properly inserted and tightened into the terminal blocks. Do not allow wire strands to stick out and touch adjoining terminals which could potentially cause a short circuit.
6.
When communication wiring is to be used to interconnect
WMVAV controllers together or to connect to other communication devices, all wiring must be minimum 18 gauge, 2 conductor, twisted pair with shield. WattMaster can supply communication wire that meets this specification and is color coded for the network or local loop. Please consult your WattMaster distributor for information. If desired, Belden #82760 or equivalent wire may also be used.
7.
Before applying power to the WMVAV controller, be sure to recheck all wiring connections and terminations
thoroughly.
7
Technical Guide
Controller Installation & Wiring
All Comm Loop Wiring Is
Straight Thru
T to T
R to R
SHLD to SHLD
Connect To Next Controller And/Or
MiniLink PD On Local Loop
For Stand Alone Applications
Connect To System Manager
VFD 0-10VDC Input
GND
The VFD Unit Must Be
Configured For 0-10VDC
Input. The Input Resistance
At The VFD Must Not Be
Less Than 1000 Ohms When
Measured At The VFD
Terminals With All Input
Wires Removed.
+
_
Supply Fan
Variable Frequency Drive
(By Others)
Local Loop RS-485
9600 Baud
Analog Inputs
See Individual Sensor
Wiring Diagrams For
Detailed Sensor Wiring
U3
CX1
1
RN1 U2
CX2
U1
TB1
COMM
T
SHLD
R
CX5
U5
LD6
COMM
LD7
PWR
1
RS-485
COMM
HH
RAM
LD8
LED1
C1
R1
LD9
LED2
U7
RV1
P1
+VREF
5.11V
TEST POINT
VREF ADJ
EWDOG
R28
INPUTS
TB3
+VDC
RN5
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
C10
C12
AOUT1
AOUT2
AIN7
GND
PJ1
C17
D15
U6
D9
PU5
D11
PU7
D14
PU1
D6
PU2
D7
PU3
D8
PU4
ADDRESS
SW1
ADD
1
2
4
8
16
32
TOKEN
NETWORK
JP1
X2
U13
CX13
U15
R15
C14
R19
C15
R22
R24
R25
C20
CX15
EPROM
TUC-5R PLUS
(1 MEG)
YS101816 REV. 2
U10
U14
CX10
U12
CX14
CX6
CX12
U4
1
U9
CX4
PAL
C7
1
D12
R13
SC1
D19
R26
PRESSURE
SENSOR
EXPANSION
Splice If Req’d
S.P.
Transducer
L1
COM1-3
R1
R2
R3
R4
R5
COM4-5
9936
U8
MC34064A
V1
V2
V3
TB2
V4
V5
NE5090NPB3192
0PS
R6
C9
C13
C16
TB4
GND
24VAC
T'STAT
VR1
VR2
Not Used
Jumper Must
Be In 0-5V Position
Connect To
As Shown
Expansion Board
Base (When Used)
R - 24VAC
G - Fan ON/OFF Only
Relay Output Dry Contacts
R2 Thru R5 May Be User Configured
For The Following:
1 - Heating (Aux. Heating)Stages
2 - Cooling (Compressor) Stages
3 - Warm-up Mode Command For Boxes
4 - Reversing Valve (Air To Air Heat Pumps)
5 - Gas Reheat Control For Dehumidification
6 - Exhaust Fan Interlock
7 - Preheat Coil
Note: Up To 16 More Relays Are Available By
Adding Relay Expansion Boards. All Expansion
Board Relay Outputs Are User Configurable As
Listed Above.
GND
24VAC
Size Transformer For
Correct Total Load. DXAHU
Controller = 8 VA Power
Consumption. If Economizer
Option Is Used
The Economizer Actuator
VA load Must Also Be
Considered When Sizing
The Transformer.
Line Voltage
Connect Tubing To High Pressure
Port (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere
Economizer
Actuator
(Belimo Shown)
Consult Factory For
Other Manufacturers
Wiring Connections
3
2
1
Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.
GND
24VAC
8
Figure 5: WMVAV Controller Wiring
WMVAV Controller
Technical Guide
Expansion Board Installation & Wiring
Jumper Settings
The expansion boards are connected to the WMVAV Controller with a modular cable. Up to 2 Expansion Base Boards can be populated with expansion boards to provide additional inputs and outputs. The expansion boards can be placed on the expansion base board in any order, however, the jumpers on the Expansion Base Board must be set correctly for proper operation. See Figure 6 for correct jumper settings and jumper locations.
Analog Inputs
Input #1- Supply Setpoint Reset
Input #2 - Remote Occupied Contact
Input #3 - Carbon Dioxide Sensor
Input #4 - Relief Pressure Sensor
Analog Output
Ground
Output #1 - Relief Fan VFD Signal (0-10VDC)
For Proper Operation Pullup Resitors PU1,
PU3 & PU4 Must Be Removed As Shown
Voltage Is Selectable For AIN1 Only
Jumper On = 0-10VDC Input Setting
Jumper Off = 0-5 VDC Input Setting
Jumper Must Be Off For AIN2 & 4
Jumper Must Be ON For AIN3
AIN1
R5
AIN2
R6
AIN3
AIN4
R7
GND
R8
R9
AOUT1
D5
PU1
PU2
C2
C3
PU3
C4
PU4
C5
C1
LM358
JO1
JO2
JO3
JO4
D2
R3
D3
R4
D4
R1
D1
R2
CX1
T L
AN
I D
U1
4 ANALOG IN MOD. I/O BD.
YS101784
R10
Address Jumpers
4 Analog Input - 1 Analog Output Expansion Board
Jumpers
Under
Expansion
Board To Be
Set As Shown
Note: This Board Utilizes Wet Contact Inputs
See Wiring Info On Next Page.
Binary Inputs
Input #1 - Humidistat Contact
Input #2 - Dirty Filter Contact
Input #3 - Remote Forced Heat Mode
Input #4 - Remote Forced Cool Mode
Common
R5
OPTO1
BIN 1
BIN 2
BIN 3
R6
R8
OPTO2
BIN 4
R10
COM
R12
4 DIG. IN MOD. I/O BD.
YS101788
R1
R2
R3
R4
CX2
U2
CX1
U1
4 Binary Input Expansion Board
Address Jumpers
Jumpers
Under
Expansion
Board To Be
Set As Shown
Relay Outputs - 6 Through 21
N.O. Contact #6 - Configurable
N.O. Contact #7 - Configurable
N.O. Contact #8 - Configurable
N.O. Contact #9 - Configurable
Common
AC
:
-PS
AC
:
-PS
4RLY IO BD.
OMRON
CONTACT
UL5A250V
G5L-114P
24VDC
OMRON
CONTACT
UL5A250V
G5L-114P
24VDC
AC
:
UL5A250V
ULN2803A/
-PS
CONTACT
24VDC
G5L-114P
OMRON
K1
PHILIPS T L
HA
AN
I D U1
AC
:
-PS
YS101790
24VDC
CONTACT
OMRON
G5L-114P
UL5A250V
K2
K3
RN1
74HC04N
PCF8574P
U2
Jumpers
Under
Expansion
Board To Be
Set As Shown
K4
Address Jumpers
Relays 6-9 Relays 10-13
Relays 14-17 Relays 18-21
4 Relay Output Expansion Board
Figure 6: Expansion Board Jumper Settings
WMVAV Controller
9
Technical Guide
Expansion Board Installation & Wiring
Wiring Considerations
The expansion base boards must be connected to 24 VAC as shown in the wiring diagram below. As noted below, the power requirement for a two slot base board is 10 VA. A four slot base board requires 20 VA. Be sure that the transformer used for powering the base boards meets these minimums. Also please note that when a binary input expansion board is used, its contacts must be wired as wet contacts (connected to 24
VAC) not dry contacts as used with the four relay expansion boards.
See Figure 7 for complete wiring details.
24VAC
POWER
INPUT
Connect to
WMVAV
Controller Board
Connect To Next
Expansion Board
(When Used)
Humidistat Contact
Dirty Filter Contact
Remote Forced Heat Contact
Remote Forced Cool Contact
Common
Relay Output #6 - Configurable (N.O. Dry Contact)
Relay Output #7 - Configurable (N.O. Dry Contact)
Relay Output #8 - Configurable (N.O. Dry Contact)
Relay Output #9 - Configurable (N.O. Dry Contact)
Common
BIN1
BIN2
BIN3
BIN4
COM
4 DIG IN BD.
YS101788
4RLY IO BD.
YS101790
Relay Output #10 - Configurable (N.O. Dry Contact)
Relay Output #11 - Configurable (N.O. Dry Contact)
Relay Output #12 - Configurable (N.O. Dry Contact)
Relay Output #13 - Configurable (N.O. Dry Contact)
Common
Supply Setpoint Reset (0-5VDC, 0-10VDC)
Remote Occupied (N.O. Dry Contact )
Carbon Dioxide Sensor (0-10VDC) Input
Relief Pressure Sensor (0-5VDC) Input
Ground
Relief Fan VFD Signal (0-10VDC) Output
4RLY IO BD.
YS101790
AIN1
AIN2
AIN3
AIN4
GND
AOUT1
4 ANALOG IN MOD I/O BD.
YS101784
WARNING!!
Observe Polarity! All boards must be wired with GND-to-GND and 24VAC-to-24VAC.
Failure to observe polarity will result in damage to one or more of the boards. Expansion
Boards must be wired in such a way that power to both the expansion boards and the controller are always powered together. Loss of power to the expansion board will cause the controller to become inoperative until power is restored to the expansion board.
Figure 7: Expansion Board Wiring
10
WMVAV Controller
Technical Guide
Wiring Details
Space Temperature Sensor
The Space Temperature Sensor is typically used for constant volume
HVAC unit applications controlling one zone. The Space Temperature
Sensor is a 10K Type III thermistor sensor. The Space Temperature
Sensor should be mounted approximately 4 ft. above the floor in the space that is to be controlled. The Space Temperature Sensor is available in a sensor only, sensor with override button, sensor with slide adjust and sensor with slide adjust and override configurations. If the
Space Temperature Sensor with Slide Adjust option is to be used, the
Fan Proof of Flow Switch cannot be used. See Figure 8 for complete sensor wiring details.
Note:
If The Slide Adjust Option Is Used On
The Room Sensor The AUX Terminal
Must Be Wired To AIN7. The Fan Proof
Of Flow Switch, Which Normally
Connects To AIN7, Is Not Available For
Use When The Slide Adjust Option Is
Used.
Space Temperature Sensor
NORMAL
OVR
M
E
R
W
A
R
C
O
O
L
E
R
TMP
GND
AUX (See Note)
Fan Proof Of
Flow Switch
(See Note)
INPUTS
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
AOUT1
AOUT2
AIN7
GND
WMVAV Unit Controller Board
Figure 8: Space Temperature Sensor Wiring
Supply & Return Temperature Sensor
The Supply and Return Air Temperature Sensors must be wired as shown in the illustration below for proper operation. The Supply and Return
Air Temperature Sensors are 10K Type III thermistor sensors. The Supply Air Temperature Sensor should be mounted in the unit discharge plenum or in the supply air duct. The Return Air Temperature Sensor should be mounted in the return air duct. If the system has a bypass damper installed, be sure the return air sensor is located upstream of the bypass duct connection. See Figure 9 for detailed wiring.
Supply
Air Temperature
Sensor
Mount In HVAC
Unit Supply
Air Duct
Return
Air Temperature
Sensor
Mount In HVAC
Unit Return
Air Duct
Figure 9: Supply & Return Temperature Sensor Wiring
WMVAV Controller
INPUTS
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
AOUT1
AOUT2
AIN7
GND
WMVAV Unit Controller Board
11
Technical Guide
Wiring Details
Outside Air Temperature Sensor
The Outside Air Sensor must be wired as shown in the illustration below for proper operation. The Outside Air Temperature Sensor is a 10K
Type III thermistor sensor. The sensor should be mounted in the upright position as shown, in an area that is protected from the elements and direct sunlight. Be sure to make the wiring splices inside of the
Outside Air Temperature Sensor weathertight enclosure. See Figure 10 for detailed wiring.
Caution:
Be sure to mount the Outside Air Sensor in an area that is not exposed to direct sunlight. A shaded area under the eve of the building or under the HVAC unit rainhood is normally a good location. If sensor is not located as specified, erroneous outside air temperature readings will result. Unused conduit opening(s) must have closure plugs installed and must be coated with sealing compound to provide raintight seal.
Water can damage sensor!
Outdoor
Air Temperature
Sensor
Make Splice Connections
Inside Sensor Enclosure
As Shown. Seal All
Conduit Fittings With
Silicone Sealant.
Mount Sensor Outdoors
In Shaded Protected
Area & In Upright
Position As Shown
INPUTS
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
AOUT1
AOUT2
AIN7
GND
WMVAV Controller Board
Figure 10: Outside Air Temperature Sensor Wiring
Remote Occupied Contact
A Remote Occupied contact closure supplied from another Building
Automation System device can be used to enable Occupied and Unoccupied modes on the WMVAV controller. This relay contact must be a dry contact and be wired as shown below. If a Humidity Sensor is to be used with your system, the Remote Occupied Contact must be wired to
AIN2 of the 4 Analog Input 1 Analog Output Expansion Board as AIN5 on the WMVAV controller will then be used for the Humidity Sensor wiring. See Figure 11 below for detailed wiring of the Remote Occupied Contact when wired to the WMVAV controller or the 4 Analog
Input 1 Analog Output Expansion Board .
Note:
If Remote Occupied Contact Is
Required When Humidity Sensor Is
Used, The Remote Occupied Contact
Must Be Relocated To AIN2 On The 4
Analog Input 1 Analog Output
Expansion Board. See Expansion
Board Wiring For Detailed Wiring.
Remote Occupied
Contact
(Relay By Others)
INPUTS
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
AOUT1
AOUT2
AIN7
GND
WMVAV Controller Board
Figure 11: Remote Occupied Contact Wiring
12
Remote Occupied
Contact
(Relay By Others)
AIN1
AIN2
AIN3
AIN4
GND
AOUT1
Note:
If Remote Occupied Contact Is
Required And Humidity Sensor Is Not
Used, The Remote Occupied Contact
Should Be Wired To AIN5 On The
WMVAV Controller Board. See Remote
Occupied Contact Wiring Of WMVAV
For Detailed Wiring.
4 Analog Input 1 Analog Output
Expansion Board
WMVAV Controller
Technical Guide
Humidity Sensor
If you want to install a humidity sensor onto the WMVAV controller, it is important that you follow these instructions. There are 2 terminals labeled “H+” and “H-”. Terminal “H+” will connect to the connection labeled “+VDC” on the analog input block. See Figure 12. Terminal
“H-” connects to the connection labeled “AIN 5” on the analog input block. Also the resistor labeled “PU5” needs to be removed. Lastly, a supplied 250 Ohm, 1/4 Watt, 1% resistor needs to be installed between
“AIN 5” and “GND”. See Figure 12 for detailed wiring.
Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.
Failure to observe the correct polarity will result in damage to the Humidity Sensor or controller.
Outdoor
Air Humidity
Sensor - 4-20mA
H+(T1)
H-(T4)
Seal All Conduit Fittings
With Silicone Sealant.
INPUTS
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
AOUT1
AOUT2
AIN7
GND
The Pull-up Resistor (PU5)
Must Be Removed
When Using A 4-20ma Device
250 Ohm
Resistor
(Shipped With Sensor)
To be Installed Between
AIN5 and GND
Note:
If Remote Occupied Contact Is
Required When Humidity
Sensor Is Used, The Remote
Occupied Contact Must Be
Relocated To AIN2 On The 4
Analog Input 1 Analog Output
Expansion Board.
WMVAV Controller Board
If You Are Using The Standard Factory Supplied Humidity Sensor, It
Has Terminals Labeled “H+ (T1)” And “H- (T4)”. Terminal “H+ (T1)” Is
The Voltage Input And Should Be Connected To The Terminal Labeled
+VDC On The WMVAV Controller. Terminal “H- (T4)” Is The 4-20 Ma
Output Signal And Should Be Connected To The Terminal Labeled AIN
5 On The WMVAV Controller.
A Factory Supplied 250 Ohm Resistor
Should Be Connected Between AIN 5 And A Ground Terminal On The
WMVAV Controller.
If A Sensor Other Than The One Supplied By The
Factory Is Used, Refer To The Wiring Instructions Shipped With The
Sensor.
Figure 12: Humidity Sensor Wiring
Supply Fan VFD Signal
The Supply Fan VFD Signal is a 0-10 VDC output. This signal output can be connected to the Supply Fan Variable Frequency Drive to control duct static pressure utilizing the Discharge Pressure Sensor connected to the WMVAV controller board. A Discharge Pressure Sensor must be connected in order for the VFD to operate. See Figure 13 below for detailed wiring.
Caution:
Variable Frequency Drive units can cause large transient noise spikes which can cause interference to be propagated on other electronic equipment. Use shielded wire wherever possible and route all sensor/controller wiring away from the Variable Frequency Drive and the Air
Handling Unit electrical wiring.
The VFD Unit Must Be Configured For 0-10vdc Input. The
Input Resistance At The VFD Must Not Be Less Than 1000
Ohms When Measured At The VFD Terminals With All
Input Wires Removed.
+
VFD 0-10VDC Input
_
GND
Supply Fan Variable Frequency Drive
(By Others)
INPUTS
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
AOUT1
AOUT2
AIN7
GND
WMVAV Unit Controller Board
Figure 13: Supply Fan VFD Signal Wiring
WMVAV Controller
13
Technical Guide
Sensor Wiring Details
Relief Fan VFD Signal Wiring
The Relief Fan VFD Signal is a 0-10 VDC output. This signal output can be connected to a Relief Fan Variable Frequency Drive to control building static pressure utilizing the Relief Pressure Sensor connected to
AIN4 on the Analog Input/Output Expansion board. A Relief (Building)
Pressure Sensor must be connected in order for the VFD to operate. See
Figure 14 below for detailed wiring.
Caution:
Variable Frequency Drive units can cause large transient noise spikes which can cause interference to be propagated on other electronic equipment. Use shielded wire wherever possible and route all sensor/controller wiring away from the Variable Frequency Drive and the Air
Handling Unit electrical wiring.
+
_
VFD 0-10VDC Input
GND
The VFD Unit Must Be Configured For 0-10vdc Input. The
Input Resistance At The VFD Must Not Be Less Than 1000
Ohms When Measured At The VFD Terminals With All
Input Wires Removed.
Relief Fan Variable Frequency Drive
(By Others)
AIN1
R5
AIN2
R6
AIN3
AIN4
R7
GND
R8
R9
AOUT1
D5
PU1
C2
PU2
C3
PU3
PU4
C4
C5
C1
LM358
JO1
JO2
JO3
JO4
R1
D1
R2
D2
R3
D3
R4
D4
CX1
T L
AN
I D
U1
4 ANALOG IN MOD. I/O BD.
YS101784
R10
4 Analog Input - 1 Analog Output Board
Figure 14: Relief Fan VFD Signal Wiring
Relief (Building) Pressure Sensor
The Relief Pressure Sensor must be wired as shown in the illustration below for proper operation. There are 2 terminals labeled “+” and “-”.
Terminal “+” will connect to the connection labeled “+VDC” on the analog input block. See Figure 15 below for detailed wiring.
Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.
Failure to observe the correct polarity will result in damage to the WMVAV Controller, Relief Pressure
Sensor and the Expansion Board.
Tubing To Building
Pressure Sensing Location
Tubing To Atmospheric
Pressure Sensing Location
Building Pressure Sensor
+
-
WMVAV Unit Controller Board
INPUTS
+VDC
AIN
1
AIN
2
AIN
3
AIN
4
AIN
5
GND
GND
AOUT1
AOUT2
AIN
7
GND
Warning
:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.
PRESSURE
SENSOR
EXPANSION
Pullup Resistor PU4
Must Be Removed As Shown
Jumper J04 Must Be Off
As Shown For Proper
0-5VDC Operation
AIN1
R5
AIN2
R6
AIN3
AIN4
GND
R7
R8
R9
AOUT1
D5
R10
PU1
PU2
C2
PU3
C3
C4
PU4
C5
C1
LM358
JO1
JO2
JO3
JO4
R1
D1
R2
D2
R3
D3
R4
D4
CX1
T L
AN
U1
4 ANALOG IN MOD. I/O BD.
YS101784
4 Analog Input - 1 Analog Output Board
Figure 15: Relief Pressure Sensor Wiring
14
WMVAV Controller
Technical Guide
Sensor Wiring Details
CO
2
Sensor
The CO
2
Sensor must be wired as shown in the illustration below for proper operation. The 24 VAC power from the main board should be wired to the CO
2
Sensor terminal block as shown. The CO
2
Sensors 0-
10 V output signal terminal is wired to terminal AIN3 on the Analog
Input/Analog Output expansion board. The Signal Ground terminal from the sensor is wired to the GND terminal on the expansion board. See
Figure 16 below for detailed wiring.
Warning: It is extremely important to be certain that the CO
2
Sensors “AC/GND” terminal is connected to the
GND terminal on the main WMVAV Controller board and the “AC+/DC”+ terminal on the CO
2
Sensor is connected to the 24 VAC terminal on the
WMVAV controller board as shown. Failure to observe the correct polarity will result in damage to the WMVAV Controller, CO
2
Expansion Board.
Sensor and the
(0-10VDC Signal)
WMVAV Unit Controller Board
GND
Line Voltage
24VAC
Warning :
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.
Jumper J03 Must Be On
With 0-10VDC Signal
Pullup Resistor PU3 Must Be
Removed As Shown
If
Signal Is Used It Must
Be Removed
AIN1
R5
AIN2
AIN3
AIN4
R6
R7
GND
R8
R9
AOUT1
D5
PU1
PU2
C2
C3
PU3
C4
PU4
C5
C1
JO1
JO2
JO3
JO4
R1
D1
R2
D2
R3
D3
R4
D4
CX1
U1
R10
LM358
4 ANALOG IN MOD. I/O BD.
YS101784
4 Analog Input - 1 Analog Output
Figure 16: CO
2
Sensor Wiring
Supply Setpoint Reset
The Supply Setpoint Reset must be wired as shown in the illustration below for proper operation. The Supply Setpoint Reset is used to reset the AHU Controller Supply Air Temperature from a Separate control source. This signal can either be a 0-5 VDC or 0-10 VDC signal. The jumper must be either on for 0-10 VDC operation or be removed for 0-
5 VDC operation.. See Figure 17 below for detailed wiring.
Warning: The low side (-, GND) of the device supplying the
0-5 VDC or 0-10 VDC signal will be grounded at the WMVAV Controller. If your equipment requires isolation, an isolation device must be provided (by others). Failure to do so could result in damage to the WMVAV Controller, the Output
Signal Device and the Expansion Board.
Supply Setpoint Reset Signal
0-5VDC or 0-10VDC
+
_
GND
Other Device That Is
Supplying Reset Signal
Jumper J01 Must Be Removed
For 0-5VDC Operation
Pullup Resistor PU1 Must
Be Removed As Shown
AIN1
R5
AIN2
R6
AIN3
AIN4
R7
GND
R8
R9
AOUT1
D5
PU1
C2
PU2
C3
PU3
PU4
C4
C5
C1
JO1
JO2
JO3
JO4
Jumper J01 Must Be On
As Shown For
0-10VDC Operation
R1
D1
R2
D2
R3
D3
R4
D4
CX1
U1
4 ANALOG IN MOD. I/O BD.
YS101784
R10
4 Analog Input - 1 Analog Output Board
Figure 17: Supply Setpoint Reset Wiring
WMVAV Controller
15
Technical Guide
Start-up & Commissioning
In order to have a trouble free start-up it is important to follow a few simple procedures. Before applying power for the first time it is very important to correctly address the controller and run through a few simple checks.
Controller Addressing
All WMVAV controllers are equipped with address switches. If the
WMVAV controller is to operate as a stand alone system (not connected to any other HVAC unit or VAVBOX controllers) the controller address switch should be set for address 1. When using the Modular Service
Tool or System Manager to program and configure the WMVAV controller you would enter this address to communicate with the controller.
When the system is to be connected to other HVAC unit controllers on a communication loop, each controllers address switch must be set with a unique address between 1 and 59. When the WMVAV controller will be used with VAVBOX controllers the WMVAV controllers address switch must be set as address 59, no exception. See Figure 18 for address switch setting information. For detailed information regarding communication wiring and connection for the WattMaster VAV networked systems, please see the WattMaster VAV Component and System Wiring -
Technical Guide.
Power Wiring
One of the most important checks to make before powering up the system for the first time, is to confirm proper voltage and transformer sizing for the controller. Each WMVAV controller requires 10 VA of power delivered to it at 24 VAC. Each 2 slot expansion board requires 5
VA at 24 VAC and each 4 slot expansion board requires 10 VA at 24
VAC. You may use separate transformers for each device (preferred) or power several devices from a common transformer. If several devices are to be powered from a single transformer correct polarity must be followed.
Warning: Observe Polarity! All boards must be wired with
GND-to-GND and 24 VAC-to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion Boards must be wired in such a way that power to both the expansion boards and the controller are always powered together. Loss of power to the expansion board will cause the controller to become inoperative until power is restored to the expansion board.
Check all wiring leads at the terminal block for tightness. Be sure that wire strands do not stick out and touch adjacent terminals. Confirm that all sensors required for your system are mounted in the appropriate lo-
This Switch Should Be
In The OFF Position
As Shown
ADDRESS
ADDRESS
ADD
1
2
4
8
16
32
TOKEN
NETWORK
ADDRESS
ADD
ADD
Controller
Address Switch
Address Switch Shown Is
Set For Address 1
Address Switch Shown Is
Set For Address 13
The Address For Each Controller
Must Be Unique To The Other Controllers
On The Local Loop And Be Between 1 and 59
Note:
The Power To The Controller Must Be Removed And
Reconnected After Changing The Address Switch Settings
Caution
Disconnect All Communication Loop Wiring From The
Controller Before Removing Power From The Controller.
Reconnect Power And Then Reconnect Communication Loop
Wiring.
INPUTS
TB3
+VDC
RN5
AIN1
AIN2
AIN3
AIN4
AIN5
GND
GND
C10
AOUT1
C12
AOUT2
AIN7
GND
PJ1
C17
D15
PU1
D6
PU2
D7
PU3
D8
PU4
D9
PU5
D11
PU7
D14
ADDRESS
SW1
ADD
1
2
4
8
16
32
TOKEN
NETWORK
U10
JP1
X2
U13
CX13
U15
CX10
R15
C14
R19
U14
U12
CX14
C15
R22
R24
R25
C20
CX15
CX12
R26
PRESSURE
SENSOR
EXPANSION
VR1
C7
D12
R13
SC1
D19
L1
VR2
R6
C9
C13
C16
TB4
GND
24VAC
Figure 18: WMVAV Controller Address Switch Setting
16
WMVAV Controller
Technical Guide cation and wired into the correct terminals on the WMVAV controller.
Be sure any expansion boards connected to the WMVAV controller are also correctly wired just as you did for the WMVAV controller.
After all the above wiring checks are complete, apply power to the
WMVAV controller and all expansion boards connected to it.
COMM LED should flicker approximately once every second to indicate communications are occurring. If the LEDs are behaving as indicated, proceed to the next step. If the LEDs fail to light or do not behave as indicated, please proceed to the troubleshooting section of this manual to diagnose and correct the problem before proceeding with the start-up process.
Initialization:
Upon applying power to the WMVAV controller the following should occur:
On system powerup a 30 second start-up delay is performed where all default setpoints are initialized, LED’s are initialized and all outputs are turned off.
When power is first applied, LED2 is turned off for 5 seconds. At this time the LED will “blink” to indicate the setting of the address switch and then extinguish for another 5 seconds. The LED will now “blink” for a 30 second start-up delay to protect the fan and other components from short cycling during intermittent power conditions. If all inputs are operating correctly it will blink once every ten seconds.
Programming The Controller
The next step is programming the controller for your specific requirements. In order to configure and program the WMVAV controller you must have a central operators interface or a personal computer with the
Prism computer front end software installed. Two different central operators interfaces are available for programming of the WMVAV controller. You may use either the Modular Service Tool or the Modular Sys-
tem Manager to access the status and setpoints of any WMVAV controller on your communications loop. See the Modular Service Tool and
System Manager Programming guide for WMVAV controller programming. If you are going to use a personal computer and the Prism computer front end software, please see the WattMaster Prism Programming Manual. No matter which operators interface you use, it is recommended that you proceed with the programming and setup of the controller in the order that follows:
The PWR LED should glow continuously. If this is a stand alone or interconnected system, The COMM LED should also glow continuously after its initial start-up routine. If this is a networked system, The
1.) Configure The Controller For Your Application
2.) Program The Controller Setpoints.
3.) Program The Controller Operation Schedules.
4.) Set The Controller Current Time And Date.
5.) Review Controller Status Screens To Verify System
Operation And Correct Controller Configuration
Mode
Selection
STATUS
PREV
SETPOINTS
UP
ESC
DOWN
CLEAR
NEXT
SCHEDULES
OVERRIDES
ENTER
ALARMS
CONFIGURATION
BALANCE - TEST
ON
1
4
7
DEC
2
5
8
0
3
6
9
System Manager
1
4
7
DEC
2
5
8
0
UP
3
6
9
PREV
ESC
DOWN
CLEAR
NEXT
ENTER
STATUS
SETPOINTS
SCHEDULES
OVERRIDES
ALARMS
Figure 19: Operators Interfaces
WMVAV Controller
17
Technical Guide
Sequence Of Operations
Initialization
On system powerup a 30 second start-up delay is performed where all default setpoints are initialized, LED’s are initialized and all outputs are turned off.
Outdoor Air Temperature
The supply air temperature may be reset, upward to a user defined maximum based on the outdoor air temperature. For example if the unit is in the heating mode, the supply air temperature can reset higher as the outdoor air temperature drops.
When power is first applied, LED2 is turned off for 5 seconds. At this time the LED will “blink” to indicate the setting of the address switch and then extinguish for another 5 seconds. The LED will now “blink” for a 30 second start-up delay to protect the fan and other components from short cycling during intermittent power conditions.
WMVAV Configuration & Setup
There are a few configuration selections available to the user, which can be used to tailor the software operation to match the mechanical equipment this controller is installed on.
Controlling Temperature Sensor
Supply Air Temperature (Default)
Select this option for cooling only units that are attempting to maintain a discharge air temperature instead of a space or return air temperature.
Space Temperature
The supply air temperature may be reset upward to a user defined maximum based on the space temperature. For example if the unit is in the heating mode, the supply air temperature can reset higher as the space temperature drops.
Fan VFD Signal
The supply air temperature may be reset upward to a user defined maximum based on the percentage of the fan VFD. For example if the unit is in the heating mode, the supply air temperature can reset higher as the fan VFD percentage increases.
Signal From a Separate Remote Unit (Local Analog Output)
For future use.
Return Air Temperature
The Return Air Temperature is used to activate the cooling, heating and vent mode of the HVAC Unit.
Space Temperature
A Space Temperature sensor can be used for constant volume applications only, to make the HVAC heating or cooling decision. It is only used in VAV applications if night setback operation is required or it is being used for Space Temperature reset.
Outdoor Air Temperature
If you want to generate occupied heating and cooling demands based on the Outdoor Air Temperature, select this option for the controlling sensor.
Signal From Remote Source
This option allows a separate WattMaster Controls device to provide a temperature reading that is used to make the HVAC mode decision.
This temperature is used in place of any onboard sensors installed. If this mode is selected, you must have a separate controller installed on the RS-485 communications loop providing this information or the unit will revert to Supply Air Temperature control. During this mode of control, the temperature provided will be used as if it was a Space Temperature and all space temperature control sequences described in this manual will apply.
Supply Air Reset:
Voltage Signal From Remote BAS
The supply air temperature may be reset, upward to a user defined maximum on a signal from a Building Automation System. A 0-10 VDC signal is applied to AIN1 on the Analog Input Expansion board to control the reset value.
Return Air Temperature
The supply air temperature may be reset, up or down, between a used defined maximum and minimum, based on the return air temperature.
For example if the unit is in the heating mode, the supply air temperature can reset higher as the return air temperature drops.
Relay Configuration:
Output Relay Configuration
Relays #2 thru 21 can be configured for the type of function that matches the WMVAV controller options. The relays can be configured for any of the following: Heating (Aux. Heating) Stages, Cooling (compressor)
Stages, Warm-up mode command for boxes, Reversing Valve for Air to
Air Heat Pumps, Gas Reheat Control for De-Humidification, Exhaust
Fan and Pre-Heater for Low Ambient Protection.
Other Control Options
Proof Of Flow Switch
The WMVAV controller can monitor a Proof of Flow Switch contact closure on analog input #7. Anytime the fan is running this contact must be closed. If the contact does not close or remain closed no heating or cooling outputs can activate or remain active. If this option is selected, the loss of this signal can generate an alarm so that the user knows there is a problem that needs to be corrected. There is a built-in five second filter provided to prevent intermittent contact “bounce” from affecting the operation.
Humidity Sensor
If you require Wetbulb Temperature calculations to enable or disable the economizer, you must install an outdoor air humidity sensor on analog input #5 and inform the WMVAV Controller to use it for the wetbulb calculation. If you install the sensor but fail to configure for this mode, the calculation will not occur, as the unit doesn’t know whether there is a humidity sensor or a remote occupied signal applied to that input.
Only one configuration can be accepted for that input.
18
WMVAV Controller
Technical Guide
If you have several Air Handlers on a job-site and they are connected together via the RS-485 communications loop, you can select this option and configure the controller to broadcast Humidity and outdoor air temperature to all controllers on the network, instead of installing a
Humidity sensor on every unit. This saves the user from having to install duplicate sensors on every air handler.
Remote Occupied Signal
If you have a separate source that will provide a dry contact closure to indicate the occupied mode, you can monitor this contact closure in place of a humidity sensor on analog input #5. If you are using the onboard humidity sensor, the remote occupied contact closure will be monitored on input #2 located on the analog input expansion board.
CO
2
Sensor Installed
You can monitor CO
2
or you can use it to modify the economizer operation to gain an Indoor Air Quality (IAQ) mode of operation. Select this option in either case. If you use it to modify the economizer operation, the minimum damper position will be increased as the CO
2
level rises above an adjustable amount. The minimum will continue to increase with the level of CO
2
until the maximum (adjustable) damper position is reached. During normal economizer control, the maximum damper position is 100%. During IAQ mode the maximum amount of air brought in is limited to the maximum damper setpoint to prevent freezing conditions during the winter months.
Relief Pressure Control
If you need to control building pressure, select this option. The controller will look for the pressure reading on input #4, located on the analog input expansion board and will send a control signal out on the analog output terminals on that same analog input expansion board. If you aren’t controlling a relief fan VFD, or inlet vanes then you can configure one of the relays to activate as an exhaust fan output. Whenever the pressure is above the setpoint by a adjustable amount, the relay activates. When the pressure drops below the setpoint by the same amount, the relay deactivates. That means it can be used in conjunction with the
VFD signal.
Supply Setpoint Reset
The cooling supply air setpoint can be reset from a Voltage Signal, Space
Temperature, Outside Air Temperature, Fan VFD Signal, or from a Local
Analog Signal provided by a separate WattMaster Controls device connected to the RS-485 communications loop.
Broadcast of Time Clock
This enables the WMVAV Controller to send its real time clock information to all controllers on the local loop. This must be used when connecting VAVBOX Controllers on the local loop, but can be used to synchronize clock time in all controllers on the local loop.
Broadcast Outdoor Air Temperature
This enables the WMVAV Controller to send its outdoor air temperature reading to all other controllers on the local loop. Specifically used when more than one WMVAV Controller is installed and only one Outside Air
Sensor is installed.
Broadcast Supply Air to units on this loop
This enables the WMVAV Controller to send its supply air temperature reading to all controllers that do not have there own sensor on the local loop. This is standard for VAVBOX applications.
Broadcast WMVAV controller’s Internal Schedule
This enables the WMVAV Controller to send its Occupied and Unoccupied status to the VAVBOX Controller on the local loop.
De-Humidification
If your HVAC unit is configured as a Constant Volume unit, you can select this option to provide dehumidification control whenever the unit is operating in the vent mode and the dehumidification signal is active.
See the Hot Gas Reheat & Dehumidification section for a complete description of this sequence.
Broadcast Main Fan & Heat Status
This enables the WMVAV Controller to send status information on whether the Main Fan is running, or if it is in Heat Mode to the VAVBOX
Controllers on the local loop. This enable is required when VAVBOX
Controllers have heating stages or are fan-powered.
Constant Volume Mode
You can configure your air handler to operate as a Constant Volume
Unit. No duct static pressure control will occur. You can still connect a static pressure sensor and monitor the reading, but no control will occur. This mode can be selected for either the standard DX Air Handler or for the Air to Air Heat Pump mode.
Air To Air Heat Pump
Select this option whenever you are controlling an air to air heat pump that utilizes a reversing valve to enter the heating mode. The same compressor relays are staged in both modes. There are not separate heating and cooling relays.
Broadcast Relative Humidity
This enables the WMVAV Controller to send its humidity reading to all other units that do not have their own humidity sensor. Specifically used when more than one air handler is on a single loop, and only one humidity sensor is used on a specific air handler on the local loop.
Scheduling
The WMVAV Controller has an internal battery backed up Real Time
Clock (RTC) that allows the controller to keep the time and allows for scheduling. It can also broadcast the time to the VAVBOX Controllers if the option is chosen.
Economizer Control
We prefer to have control of the economizer if your equipment is so equipped. If it is not, you can deselect the economizer control with this option. If you have third party economizer controller, proper cooling operation cannot be guaranteed since this WMVAV controller code uses the economizer as the true first stage of cooling. If you use the first compressor output to enable a separate economizer controller, you may encounter false mechanical cooling alarms.
The WMVAV Controller has an internal 7 day schedule with 2 startstop events per day. You can also have 1 holiday schedule with 2 startstop events. This holiday schedule can be used for 14 different holiday periods.
One thing to be noted is that you cannot view the current time when you are viewing the WMVAV Controller with the Modular Service Tool or the System Manager. You can however change the time on the WMVAV
WMVAV Controller
19
Technical Guide
Sequence Of Operations
Controller through the Modular Service Tool or the System Manager. If there is any doubt on the current time, reenter the time and date and it will change the controller to match what you enter. If you want the feature of viewing the current time the WMVAV Controller is using, you must install a Personal Computer and the PRISM computer front end software.
The internal scheduling in the WMVAV Controller also includes a “selfteaching” optimal start routine that can be activated by entering a value greater than 1.0 for the Soak Multiplier setpoint. The optimal start function can only be used if your WMVAV Controller has an attached Space
Sensor and it is being used as the controlling sensor, or you are receiving a signal from another WattMaster Controls device for the express purpose of utilizing the optimal start. No adjustments other than the Soak
Multiplier are required from the user as the WMVAV Controller monitors how long it takes to reach the target temperature each day and adjusts the starting time accordingly. That means the first day you operate your HVAC unit it will not be able to optimally start because it does not have a “history” of previous starts and their results. After the first day, the WMVAV Controller will begin adjusting the start time and after six normally scheduled starts have occurred, the routine will have gathered enough data to provide an accurate pre-start based on the “learned” conditions. This is an ongoing learning process of the six previous starts, so the unit automatically adjusts for the changing seasons. If you don’t need this feature but you are using the space sensor as the controlling sensor, you can set the Soak Multiplier to zero to eliminate the optimal start routines.
Occupied/Unoccupied Mode
The WMVAV controller can utilize one of three methods for determining the Occupied Mode of Operation. An internal Week Schedule, which supports up to two start/stop events per day, is available. The unit can be configured to monitor for a contact closure from some other source.
Or, the unit can be configured to monitor the communications loop for an external scheduling device if several WMVAV controllers are present and they all need to follow the same schedule. If the contact closure is to
be used, it is necessary to set all the internal week schedules to ‘0’ so that the internal schedule always commands the unoccupied mode.
input is shorted to ground or left “floating” with no sensor detected for more than 10 seconds, it is considered a sensor failure if the WMVAV controller is configured for Space Temperature control.
You can still use the space sensor input for an override command even when a space sensor is not connected. Simply provide a momentary push-button connected between Input #1 and the Ground terminal on the same connector. Follow the above procedure for initiating overrides, even on Supply Air Controlled cooling only air handling units.
Main Fan Control
Anytime the fan is requested to start, a timer is checked to make sure it has been off at least 1 minute. This 1 minute delay is to protect against rapid cycling on and off of the fan. Once the 1 minute has been satisfied, the fan relay is activated and all other outputs are verified to be in the off condition for a period of between 1 to 2 minutes. This short period of operating alone serves to purge the stagnant air from the duct before any heating or cooling occurs.
HVAC Mode Calculation
There are 5 possible HVAC Modes of Operation. They are:
Vent Mode
Cooling Mode
Heating Mode
Warm-Up Mode
Dehumidification Mode
Off Mode
The process of determining each mode is discussed below, but the actual operation of each mode is in a later section of this manual.
Vent Mode
The controlling temperature is within setpoint limits and no heating or cooling is required to maintain the temperature.
In any case, the WMVAV controller can still monitor the optional pushbutton override signal from the space temperature input and revert back to occupied mode for a programmed amount of time.
Cooling Mode
The controlling temperature is above the Cooling Setpoint by the user adjustable Deadband amount or this is a Supply Air Controlled Cooling
Only WMVAV controller in the Occupied Mode.
If you are using the internal week schedule mode, an optimal start calculation is available. See the Scheduling section of this manual for more information on the Optimal Start feature.
Push-button Override Operation
During unoccupied hours, the user can force the WMVAV controller back to occupied operation by pressing the override button for a period of time less than 3 seconds. This initiates the override or resets the override timer back to zero during unoccupied hours of operation.
Heating Mode
The Space Temperature or Return Air Temperature is the controlling temperature when the temperature is below the Heating Setpoint by the user adjustable Deadband amount.
Warm-up Mode
Can be initiated by a cold Return Air Temperature when the controller switches from Unoccupied to Occupied Mode.
During Override operations, the user can cancel the override by pressing the override button for a period of time between 3 seconds and 10 seconds. This restores the normal unoccupied operation.
Dehumidification Mode
If the humidity level rises above the humidistat setpoint when the HVAC unit is in Vent Mode it will be switched to Dehumidification Mode.
If the override button is held for more than 10 seconds, it causes a Bad
Sensor Failure Alarm. This is due to the fact that the override button actually shorts the Space Temperature sensor input to ground. If this
Off Mode
If the schedule has set the Unoccupied Mode and no heating or cooling demands are keeping the system on, the WMVAV controller switches to the Off Mode.
20
WMVAV Controller
Technical Guide
Remote Control of HVAC Mode
The Vent Mode and Heating and Cooling modes can be determined by a remote Building Automation System (BAS) if you set both of the heating and cooling setpoints to zero. This forces the controller to monitor for contact closures on the Binary Input Expansion board. If used in conjunction with the Remote Occupied contact closure, one or both of the operating decisions can be made by a separate BAS. If this mode of operation has been selected by setting the setpoints to zero, then the controller sets the Vent mode when both contacts are either open or closed. (Both in the same state) If input #3 is activated, the WMVAV controller enters the heating mode. If input #4 is activated the WMVAV controller enters the cooling mode. It is up to the BAS to make sure it doesn’t cycle these inputs on and off rapidly, which would cause the
WMVAV controller to operate erratically. Once the mode has been set, normal heating or cooling operations occur and all other user adjusted setpoints, such as the supply air setpoint are used in the actual control of the equipment.
One of four sensors or the Remote BAS option can be configured as the
Controlling Temperature Sensor. The four sensors are Space Temperature, Supply Air Temperature, Outdoor Air Temperature or Return Air
Temperature. The Supply Air Temperature is the default control sensor.
Whichever sensor is selected, the mechanical cooling is still staged in the same manner described below.
No matter which sensor is in control or if the BAS sets the mode, the
Supply Air Temperature is always controlled to the Supply Air Setpoints.
The Space/Return air Cooling Setpoint is not used by the WMVAV controller if the Supply Air is the controlling sensor or the Remote BAS is setting the mode.
Compressor Staging
When in the Cooling Mode of operation the compressors will stage on and off to maintain the Supply Air Temperature. The method that is used to accomplish this is explained in the following paragraphs.
Note: The following operations describe the control provided when the unit is configured as a VAV or Constant
Volume Air Handler. If you configured for Air to Air
Heat Pump operation, see that section of this manual for a description of how each of these modes operates.
All staging is based on a Heating/Cooling Supply Control Deadband value that is entered by the user. This value is used to determine the number of stages that will be activated as the temperature rises or falls within this deadband range.
The value is applied equally above and below the Supply Air Cooling
Setpoint to stage compressors on and off.
Vent Mode Operation
This mode only applies to the Occupied Mode of operation. If the equipment is in the Unoccupied Mode, then a lack of heating or cooling demand would generate the Off Mode.
Staging Up Example:
You have selected a 2°F Heating/Cooling Supply Control Deadband and a supply air setpoint of 55°F. This means that when the Supply Air
Temperature rises above 57°F (2°F deadband above setpoint) the first stage of cooling would be initiated. Additional stages of cooling would be initiated based on the Minimum Off Time Setpoint and the Staging Up
Delay Setpoint. Information regarding these setpoints follows after this example.
Note: During Vent Mode, all cooling stages are deactivated and the economizer dampers are maintained at a minimum position to provide fresh air into the building. The
Static Pressure is still maintained by the Fan VFD signal since the Fan is still operating in this mode.
In addition to the staging sequence just outlined, there are timing requirements to protect the compressors and to enhance the temperature control.
Cooling Mode Operation
If the space temperature sensor is used for control, this mode can also be generated during unoccupied hours via the Night Setup Offset applied to the occupied Cooling Setpoint. If the Supply Air or Return Air control the temperature, this mode is only generated during occupied hours of operation or override periods.
There are two timing requirements for each compressor stage that must be satisfied before they can be activated. These are:
Minimum Off Time: A compressor cannot be activated unless it has been off for this amount of time.
The Mechanical Cooling will be disabled if the Outdoor Air Temperature is below the Cooling Lockout Setpoint by 1°F. This gives a 2°F hysteresis around the Cooling Lockout Setpoint to prevent unwanted cycling in and out of mechanical cooling mode
If the outdoor air temperature disables the mechanical cooling while it is currently operating, the mechanical cooling will simply stage off if all staging and run times are satisfied.
Staging Up Delay: On a cooling demand call, all stages of cooling are enabled to start based on the Heating/Cooling Supply Control Deadband that has been set. The staging up delay period prevents all the enabled compressors from starting at once by requiring this period of time to elapse between each stage of compressor before it can be activated. This allows fine tuning of the operation by activating a stage and waiting for this amount of time to see if any additional stages are still required. If the supply temperature drops within the deadband range no additional compressors will be activated because you are within the specified temperature range with the current number of active compressors.
If the Economizer has been enabled for operation, it is used as the first stage of cooling and then the mechanical cooling is activated if necessary. See the Economizer Operation section for a more detailed operating sequence. This section applies more to the mechanical cooling operation.
WMVAV Controller
21
Technical Guide
Sequence Of Operations
Staging Down Example:
You have selected a 2°F Heating/Cooling Supply Control Deadband and a supply air setpoint of 55°F. This means that when the Supply Air
Temperature falls below 53°F (2°F deadband below setpoint) the last stage of cooling would be deactivated. Additional stages of cooling would be deactivated based on the Minimum Off Time Setpoint and the Staging Down Delay Setpoint. Information regarding these setpoints follows after this example.
In addition to the staging sequence just outlined, there are timing requirements to protect the compressors and to enhance the temperature control.
There are two timing requirements for each compressor stage that must be satisfied before they can be deactivated. These are: setpoint by 1°F to enable the economizer during the cooling mode of operation. When the temperature rises 1°F above the enable setpoint the economizer will be disabled and return to minimum position.
As soon as the cooling mode is started, the economizer will calculate a starting damper position based on the outdoor air temperature and the distance of the supply air temperature from the supply setpoint. After it moves to this initial setpoint, further adjustments will be made in small increments to “fine tune” the damper position to maintain the supply setpoint. If the economizer reaches 90% open and the supply air is still too warm, the mechanical cooling will be enabled to operate to provide additional “stages” of cooling. Once a mechanical cooling stage has been activated, the economizer will remain full open until the mechanical cooling stages off or the outdoor air / wetbulb temperature causes the economizer to be disabled.
Minimum Run Time: A compressor cannot be deactivated unless it has been on for this amount of time.
Staging Down Delay: This value determines how rapidly compressors can be staged off if the Supply Air Temperature is falling below the
Heating/Cooling Supply Control Deadband. This prevents all compressors from cutting off at the same time if there is a rapid drop in temperature. On a decrease in cooling demand, stages of cooling are deactivated based on the Heating/Cooling Supply Control Deadband that has been set. The staging down delay period prevents all the enabled compressors from shutting off at the same time by requiring this period of time to elapse between each compressor stage before it can be deactivated.
This allows fine tuning of the operation by deactivating a stage and waiting for this amount of time to see if any additional stages need to be deactivated. If the supply temperature rises within the deadband range no additional compressors will be deactivated because you are within the specified temperature range with the current number of active compressors.
If the supply temperature ever drops below the Supply Lo Cutoff
Temperature Setpoint, all stages will be immediately deactivated to prevent freezing and all timing requirements will be ignored. The minimum off time will need to be satisfied before compressors can begin staging on again, once the supply air has risen back to a level that requires mechanical cooling stages.
Economizer Operation
This section assumes you have configured your air handler to control the outside air dampers in an economizer mode of operation.
The supply air temperature must be above the supply setpoint by the user adjustable amount before the mechanical cooling can be activated.
That means that if the supply is brought to within that defined window, the unit will consider the supply air satisfied and will not waste energy bringing on additional cooling.
If you have configured the WMVAV controller to monitor and control
Carbon Dioxide levels, the economizer operation will be modified as follows:
1.
The Maximum amount the economizer can open is determined by a user adjustable setpoint. Normally, the economizer can modulate full open to bring the supply air under control.
2.
The Minimum position the economizer can close down to is reset higher as the level of CO
2
Maximum CO
2
increases above the
Level programmed by the user. When the
CO
2
level has increased the full amount above setpoint, set by the user, the economizer will be held to its maximum position and not allowed to open any further. The CO
2
level may not be decreasing but this provides protection against freezing conditions when it is cold outside.
Heating Mode Operation - Staged Heating
When in the Heating Mode of operation the electric or gas staged heat will stage on and off to maintain the Supply Air Temperature. The method that is used to accomplish this is explained in the following paragraphs.
If the Cooling Mode has been activated, as described under the Cooling
Mode Operation section, the economizer is used as the first stage of cooling. If the outdoor air temperature and, optionally, the humidity are low enough, the system provides free cooling by opening the outside air dampers.
As with the Cooling Mode operation, all staging is based on a Heating/
Cooling Supply Control Deadband value that is entered by the user.
This value is used to determine the number of stages that will be activated as the temperature rises or falls within this deadband range.
If the economizer is not enabled to provide cooling, it will still maintain the minimum position programmed by the user to provide minimum fresh air into the building.
The value is applied equally above and below the Supply Air Heating
Setpoint to activate or deactivate stages of heating.
As mentioned above, the WMVAV controller can monitor an outdoor air humidity sensor and combine that reading with the outdoor air temperature reading to create a Wetbulb Temperature. If this wetbulb temperature is not available, just the outdoor air temperature will be used. Whichever temperature is available, it must be below the economizer enable
Staging Up Example:
You have selected a 2°F Heating/Cooling Supply Control Deadband and a supply air setpoint of 120°F. This means that when the Supply Air
Temperature drops below 118°F (2°F deadband below setpoint) the first stage of heating would be initiated. Additional stages of heating would be initiated based on the Minimum Off Time Setpoint and the
22
WMVAV Controller
Technical Guide
Staging Up Delay Setpoint. Information regarding these setpoints follows after this example.
In addition to the staging sequence just outlined, there are timing requirements to protect the heating equipment and to enhance the temperature control.
There are two timing requirements for each heating stage that must be satisfied before they can be activated. These are:
Minimum Off Time: A heating stage cannot be activated unless it has been off for this amount of time.
Staging Down Example:
You have selected a 2°F Heating/Cooling Supply Control Deadband and a supply air setpoint of 120°F. This means that when the Supply Air
Temperature rises above 122°F (2°F deadband below setpoint) the last stage of heating would be deactivated. Additional stages of heating would be deactivated based on the Minimum Off Time Setpoint and the Staging Down Delay Setpoint. Information regarding these setpoints follows after this example.
If the supply temperature ever rises above the Supply Hi Cutoff Temperature Setpoint, all stages will be immediately cutoff to prevent overheating and all timing requirements will be ignored. The minimum off time will need to be satisfied before heating stages can begin staging on again, once the supply air has dropped back to a level that requires additional heating.
Warm-up Mode Operation
Whenever the WMVAV controller is returned to occupied operation
(not override mode!), the unit compares the return air temperature to a target warm-up temperature. If the return air is below this setpoint, the warm-up mode is initiated. This mode remains in effect until the return rises above the target temperature or a user adjusted time period elapses.
Warm-up mode is not initiated by push-button overrides or unoccupied heating demands.
Staging Up Delay: On a heating demand call, all stages of heating are enabled to start based on the Heating/Cooling Supply Control Deadband that has been set. The staging up delay period prevents all the enabled stages from starting at once by requiring this period of time to elapse between each stage of heat before it can be activated. This allows fine tuning of the operation by activating a stage and waiting for this amount of time to see if any additional stages are still required. If the supply temperature rises into the deadband range no additional stages of heat will be activated because you are within the specified temperature range with the current number of active stages.
Once the warm-up mode has been terminated, it cannot resume until the unit has been through a subsequent unoccupied mode. (Only one warmup mode per day!)
If you have stand alone VAV boxes that need to be forced wide open during the warm-up mode, you can configure one of the relay outputs to be used during this mode. If the warm-up mode is active, the relay is activated. This relay then becomes the force open command for all boxes to which it is wired.
Dehumidification Mode Operation
If your HVAC unit is configured for constant volume operation and has a humidistat installed, the unit will switch to dehumidification mode when the humidity in the space rises above the humidistat setpoint while the unit is in the Vent Mode of operation. Dehumidification will not initiate if the HVAC unit is in Heating or Cooling modes.
In addition to the staging sequence just outlined, there are timing requirements to protect the heating equipment and to enhance the temperature control.
There are two timing requirements for each heating stage that must be satisfied before they can be deactivated. These are:
Minimum Run Time: A stage cannot be deactivated unless it has been on for this amount of time.
When the HVAC unit is switched to Dehumidification Mode by the closure of the humidstat contact, half of all available cooling stages will be enabled and staged to bring the humidity level below the humidistat setpoint. When in dehumdification mode the Supply Air Setpoint is reset to a value calculated to be halfway between the Space Heating and
Space Cooling Setpoints in order to try to deliver neutral air to the space. An additional stage of cooling may be intitiated in order to maintain the Supply Air Temperature at the new calculated Supply Air Temperature Setpoint. If the unit is equipped and configured for reheat the reheat will also be cycled to try to maintain the Supply Air Temperature at the new calculated Supply Air Temperature Setpoint.
Staging Down Delay: This value determines how rapidly heating stages can be staged off if the supply temperature is rising above the Heating/
Cooling Supply Control Deadband. It prevents all enabled stages from cutting off at the same time if there is a rapid rise in temperature. On a decrease in heating demand, stages of heating are deactivated based on the Heating/Cooling Supply Control Deadband that has been set. The staging down delay period prevents all the enabled stages from being deactivated at once by requiring this period of time to elapse between each stage of heating before it can be deactivated. This allows fine tuning of the operation by deactivating a stage and waiting for this amount of time to see if any additional stages need to be deactivated. If the supply temperature falls within the deadband range no additional heat stages will be deactivated because you are within the specified temperature range with the current number of active stages.
WMVAV Controller
If your HVAC unit is configured for VAV operation, dehumidification is available in cooling mode. With VAV units when you are using Supply
Air Control, Supply Air Reset capabilities are removed during the dehumdidification mode. Reheat is not available for VAV systems.
Off Mode of Operation
Once the unit goes unoccupied and no heating or cooling demands exist, the unit stages off any active stages, the economizer and fan VFD outputs turn off and the Main Fan turns off. No outputs are active. If a space sensor is installed and the supply air or return air sensor is the controlling temperature, then the WMVAV Controller will monitor the space temperature for an unoccupied heating demand. If the space gets too cold, the unit will provide unoccupied heat until double the deadband amount has been restored. The economizer remains fully closed during this time. If the space temperature sensor is installed, then both heating and cooling occupied setpoints are setback and heating and cool-
23
Technical Guide
Sequence Of Operations
ing demands are created when the space temperature exceeds either limit during unoccupied hours. The unoccupied setpoints are created by adding user adjustable offsets to the occupied setpoints. If the heating or cooling demand is satisfied, the unit will return to the off mode.
able Relief Pressure Setpoint. If you don’t require a modulating control signal, you can also configure one of the relay outputs to activate whenever the relief pressure setpoint is exceeded. Only one relay should be configured for this operation. There is no staging of additional exhaust fan relays.
If a push-button override occurs during the off mode or an unoccupied heating or cooling demand, the unit will switch over to using the occupied heating and cooling setpoints as required by the configuration.
This will remain in effect until the override times out or is cancelled by the user
Static Pressure & Fan VFD Control
The WMVAV Controller reads and controls Static Pressure in the duct system if it has been configured as a VAV air handler. Anytime the fan is operating, the WMVAV Controller is controlling Static Pressure. The
Static Pressure Setpoint and Deadband limits are user adjustable along with a controlling interval. The static setpoints are entered as Inches of
Water Gauge. The default setpoint is 0.5”WG. The control interval is the amount of time that elapses between each adjustment to the VFD signal.
The default period is 10 seconds and should not be changed unless close observation reveals that the fan is “hunting” and not maintaining a stable pressure reading.
Optional Control Configurations
Exhaust Fan Control
See the previous section, Relief Pressure & VFD Control, for an explanation on how this relay output is used to maintain the building pressure.
Hot Gas Re-Heat And
Dehumidification Control
(If Available)
If your unit is equipped with Hot Gas Reheat and you configured your
WMVAV controller for dehumidification control, you need to install a humidistat on the optional Binary Input Expansion Board, Input #1.
You also need to configure one of the relays to operate in the Hot Gas
Reheat mode.
The normal control is to increase fan speed if the static is below the setpoint by the deadband amount and to decrease fan speed if the static is above the setpoint by the deadband amount. If the static ever rises
0.5” above the setpoint, the fan speed will be cut in half every control period until the pressure is brought under control. This is to prevent damage to the ductwork if all the air-valves are closed or some other blockage occurs in the ductwork.
The WMVAV controller activates a number of compressors based on the number of stages available. Anytime dehumidification is activated, the
Supply Setpoint is calculated as being halfway between the Heating and
Cooling setpoints if they are at least 2° apart. If the halfway point turns out to be 65°F or lower, the Supply Setpoint will default to 68°F.
Warning: The manufacturer does not assume responsibility for protecting the equipment from over pressurization!
The user should always install mechanical high static protection cutoffs to protect their system!
Shown below are the initial compressor requirements when the dehumidification mode is entered. It assumes that the Gas Reheat and voltage outputs are active only as long as the compressors are running and the unit is still able to remain in the dehumidification mode.
When the fans starts, the VFD signal will go to Minimum VFD % for heating. Anytime the fan is off the VFD signal will remain at zero volts.
For Constant Volume units the dehumidification mode occurs when the
HVAC unit is in the Vent Mode and the humidity level has risen above the humidistat setpoint.
For VAV units using Supply Air Control, Supply Air Reset capabilities are removed during the dehumidification mode. No hot Gas Reheat Relay will be activated when in dehumidification mode with a VAV unit.
If you configured your WMVAV Controller as a Constant Volume Unit, you can monitor the Static Pressure if the sensor is installed, but no control will occur.
Relief Pressure & VFD Control
If this option is selected, the building pressure will be maintained anytime the main supply fan is operating by varying a 0-10 VDC control signal on the optional Analog Input Expansion Board. The signal can drive either a Fan VFD signal or an Actuator to maintain the user adjust-
24
WMVAV Controller
Technical Guide
Number Of
Compressors on
HVAC Unit
1
2
4
6
8
Initial Compressor
Stages
Activated
1
1
1, 2
1, 2, 3
1, 2, 3, 4
The Air to Air Heat Pump does not support the Hot Gas Re-Heat dehumidification mode of operation. If you have configured your unit for this operation, it will be ignored.
The Heat Pump can be configured to operate either in a VAV or a Constant Volume mode of operation. The warm-up mode is also available, if desired.
Caution:
If you don’t configure one of the relays to be the Reversing Valve, you will always get cool ing whenever the compressors are activated in the heating mode!
Table 1: Compressor Staging For Dehumidification
In addition to the compressors, a gas reheat relay can activate after a user adjustable delay period if the supply air temperature is less than the heating setpoint. The gas reheat relay will be deactivated when the supply air temperature rises above the cooling setpoint.
Preheat Operation
In colder climates it is sometimes desirable to preheat the outside air being drawn into the air handler before it reaches the compressor coils.
This option is available by setting a Low Ambient protection setpoint and by configuring one of the relay outputs as a Pre-Heater. Only one relay should be configured for this option and staging of preheat relays is not part of the control sequence.
Alarm Detection and Reporting
The WMVAV controller continuously performs self diagnostics during normal operations to determine if any operating failures have occurred.
These failures can be reported to the user in several ways, depending on the type of system and options installed by the user.
If a Modular Service Tool or System Manager is connected, the alarms will be reported on the Status Screens. If the Prism computer graphic front end is installed, the alarms will be reported on the main screen of the program and logged to disk. If neither remote communication option is installed, the user can check for alarms by viewing LED2 on the
WMVAV controller board. If everything is operating normally, the LED will blink once every 10 seconds. If there is a problem detected, the
LED will flash a specific number of times every 10 seconds to indicate what the problem is. These flashes or “blink codes” are described below in order of priority. The highest priority condition must be corrected before any lower conditions can be observed and corrected. One blink is the lowest priority and indicates no alarms. Five blinks is the highest priority.
Anytime the outdoor air temperature is below the Low Ambient setpoint and the main fan is running, the preheat relay will activate. It will remain on until the outdoor air rises 1°F above the setpoint or the main fan deactivates. It also requires the fan proving signal to be active if you have installed and configured a proof of flow contact closure on input
#7. This output is not affected by any other mode of operation and will operate in all other HVAC modes of operation such as cooling or vent modes.
Air to Air Heat Pump
If you configured this WMVAV controller as an Air to Air Heat Pump unit, the following HVAC modes will occur. These may vary somewhat from those described in the VAV / Constant Volume sections of this manual.
If the RemoteLink (modem) is installed, any alarm condition can initiate a callout to a pager to alert someone to the alarm condition. See the Prism computer front end program operations manual for further information on this topic.
LED Blinks This
Number Of Times
1
You must configure the Heat Pump to use the Space Sensor to provide the heating or cooling calls, otherwise, incorrect HVAC decisions may be made. Although the system allows you to select one of the other two sensors for control, that is not the recommended method and proper operation cannot be guaranteed.
Once the heating or cooling mode is determined, the staging up and down of compressors is the same as described earlier in this manual. The only difference is that a Reversing Valve relay output is activated with the first compressor stage in the heating mode of operation. All staging up and down and minimum run and off times must be satisfied. These timers are described in the previous Heating and Cooling mode sections.
2
3
4
5
Blink Code
Description
Normal Operations. No
Alarm Conditions
Pushbutton Override Is
Active During Unoccupied
Period
Space Temperature Sensor
Failure Detected
Fan Proving Alarm
Unit In Force Mode
Table 2: Diagnostic Blink Codes
WMVAV Controller
25
Technical Guide
Sequence Of Operations
Force Modes or Overrides
The WMVAV Controller relay and analog outputs can be user overridden if the Modular Service Tool or the PRISM graphical front-end program is available. The modes of operation for the relays are:
0 = Normal Operation
1 = Forced ON
2 = Forced OFF
Shown below are some log intervals and the duration of 120 logs.
1 Minute Interval = 2 Hour Duration
15 Minute Interval = 30 Hour Duration
30 Minute Interval = 60 Hour Duration
60 Minute Interval = 120 Hour Duration
The analog outputs are forced if the user specifies a value between 0.0
and 10.0 VDC. To cancel the force mode, enter a value less than zero (-
1.0 VDC).
When the analog outputs are forced, the display on the Modular Service
Tool or front-end can be interpreted as the actual voltage. During normal operation, the display indicates the percentage signal applied based on the user defined voltage limits. For example, if the user defines a 2.0
VDC to 10.0 VDC range, then 50% would be 6.0 VDC instead of the
5.0 VDC applied when the range is 0.0 VDC to 10.0 VDC.
As mentioned, force modes can only be activated with an attached remote communications device listed above. Furthermore, the override condition can only remain in effect as long as the remote device is connected and communicating with the unit. That means that you cannot set an override condition and then “walk away” from the equipment with the override still active. The loss of communications or the removal of the remote interface will automatically terminate the override within 10 minutes. This is to protect the equipment and to prevent an override condition from remaining active indefinitely resulting in inefficient operation of the equipment.
The fixed items in the log are listed below:
Date
Time
Space Temperature
Return Air Temperature
Active Cooling Setpoint
Active Heating Setpoint
Supply Air Temperature
Outdoor Air Humidity ( 0.0 if not installed )
Outdoor Air Temperature
Static Pressure
Economizer Signal Percentage
Supply Fan VFD Signal Percentage
Relief Fan VFD Signal Percentage
Onboard Relay Status ( BIT Pattern )
Expansion Board Relay Status ( BIT Pattern )
Supply Setpoint Reset Value
Relief Pressure Reading
Caution:
No equipment protection is available during the force mode of operation. That means you could start a compressor without running the fan or create other conditions that WILL damage the
HVAC equipment. WattMaster Controls, Inc.
assumes no responsibility or liability for the misuse of these user overrides that cause damage to the HVAC equipment!
Internal Trend Logging
The WMVAV Controller continuously maintains an Internal Trend Log, which records a fixed set of values at an interval programmed by the user. These values can be retrieved only with the PRISM graphical frontend program. If you don’t have the Remote Communications option with a front-end program, you do not have access to these logs.
These items and values are explained in greater detail in the PRISM manual.
VAV Box Compatibility
If you have VAV Boxes installed on your job-site and have elected to use the WattMaster Controls VAVBOX Controllers, the WMVAV Controller is automatically “aware” of these boxes and can provide features such as unoccupied overrides from a box controller or unoccupied heating calls from a box controller. The WMVAV Controller also “broadcasts” its supply air temperature to any other units installed on the same communications loop and the boxes can use that information to determine warm-up mode or its heating/cooling/vent mode of operation.
The System Manager, Modular Service Tool and computer front end program are also able to communicate with these VAVBOX Controllers and aid in providing the user with a complete VAV system on smaller buildings that do not require a full scale building automation system. See the VAVBOX Controller Technical Guide for information about installation and programming of the VAVBOX controllers.
There are 120 log positions available. Once the last ( 120th ) position has been recorded, the log jumps back to the first position and begins overwriting the old data. This means the user is required to retrieve the logs at an interval that is shorter than the duration of the last 120 logs.
If you have third party VAV Box Controllers installed, the WMVAV
Controller can activate a relay to inform the boxes that it is operating in a warm-up mode, but no other information can be passed between the
WMVAV Controller and its boxes so overrides and unoccupied heating demands cannot activate the WMVAV Controller to satisfy the calls.
Your only option is to use the remote contact closures for Occupied/
Unoccupied and possibly the HVAC Mode contact inputs provided by a separate BAS that is able to communicate with the box controllers.
26
WMVAV Controller
Technical Guide
Troubleshooting
Using LED’s To Verify Operation
The WMVAV controller is equipped with LEDs that can be used as very powerful troubleshooting tools. Their are four LEDs on the WMVAV controller board. Three of these LEDs are used in troubleshooting. See
Figure 18 for the LED locations. The LEDs and their uses are as follows:
WMVAV Controller Board
Communications Terminals
System Manager Can Be
Connected Here
(COMM) Communications
COMM
T
SHLD
R
DIN Connector
For Modular
Service Tool
“COMM”
This LED will light up to indicate system communications.
“PWR”
This LED will light up to indicate that 24 VAC power has been applied to the controller.
(PWR) Power
(LED1) Not Used
COMM
PWR
LED1
LED2
(LED2) Diagnostic
“LED1”
This LED is not used for this controller application.
“LED2”
This is the diagnostic blink code LED. It will light up and blink out diagnostic codes.
PWR LED Operations
When the WMVAV Controller is powered up the “PWR” LED should light up and stay on continuously. If it does not light up, check to be sure that you have 24 VAC connected to the board, that the wiring connections are tight and that they are wired for the correct polarity. The 24
VAC power must be connected so that all ground wires remain common. If after making all these checks the PWR LED does not light up, please contact WattMaster technical support for assistance.
Figure 20: LED & Interface Connection Locations
If the COMM LED still does not behave correctly, check the voltages at the communications terminal block. Be sure the board is powered up for this test. Unplug the communications terminal block from the board and check the DC voltage between T and SHLD and between R and
SHLD. Check the voltage with a digital multimeter set to DC volts. The voltage should be between 2.4 to 2.5 VDC between SHLD and either T or R. If your voltage is not in this range, you probably have a damaged driver chip that must be replaced. For driver chip replacement instructions, please see the WattMaster WMVAV Controls System Installation
& Troubleshooting Guide for more information or contact the factory for further assistance.
COMM LED Operations
When power is applied to the controller The “COMM” LED will also light up. If this is a Stand Alone System (one controller only on the loop) or an Interconnected System (several WMVAV controllers tied together without a CommLink) the COMM LED will glow continuously. The COMM LED will flicker when you are connected to the
WMVAV controller and you are entering setpoints with the Modular
Service Tool or the System Manager. It will also flicker if this is a Networked System. If this is a Networked System (the system has a CommLink installed) the COMM LED should flicker rapidly indicating that the system is communicating. A “flicker” is defined as a brief moment when the LED turns off then back on. It may be easier to see this “flicker” if you cup your hand around the LED.
LED2 (Diagnostic LED) Operations
When power is first applied, LED2 is turned off for 5 seconds. At this time LED2 will “blink” to indicate the setting of the address switch and then extinguish for another 5 seconds. Verify that the address switch setting is correct by counting the number of blinks. If the address switch setting is not correct, remove the communication loop terminal plug from the controller and then the power terminal plug. Correctly set the address switch setting (see Figure 18) with the dip switches on the controller, reconnect the power connection and then the communication loop. Reapply power to the controller and observe the blink code to verify the address is set correctly.
If the COMM LED does not operate as indicated above, first check the address switch setting. Verify the address switch as outlined in LED
(Diagnostic LED) Operations below. If the address switch setting is correct and the COMM LED still does not behave as indicated above, check to be sure the operators interface is connected correctly. The
System Manager must be connected to a local communications loop either at the WMVAV controller as shown in Figure 20 or to another controller on the same local communications loop. If you are using the
Modular Service Tool, verify that it is plugged in securely to the DIN connection on the WMVAV controller. See Figure 20 for DIN connector location.
WMVAV Controller
27
Technical Guide
Troubleshooting
Note: Power to the Controller being addressed must always be cycled after changing address switch settings in order for the changes to take effect. Always unplug the communications terminal block before removing the power terminal block from the board. When finished reinstall the power terminal block first and then the communications terminal block.
If LED2 blinks the correct address your board is addressed correctly. If it does not light up at all, the board is not operating correctly and could be defective.
If all of these tests are made and the controller still doesn’t operate, see the WattMaster VAV Component & System Wiring - Technical Guide for more information or contact the WattMaster Technical Support Toll
Free Number at 866-918-1100 for further assistance.
Appendix
Sensor Checks
The following sensor voltage and resistance tables are provided to aid in checking sensors that appear to be operating incorrectly. Many system operating problems can be traced to incorrect sensor wiring. Be sure all sensors are wired per the wiring diagrams in this manual.
If the sensors still do not appear to be operating or reading correctly, check voltage and/or resistance to confirm that the sensor is operating correctly per the tables. Please follow the notes and instructions below each chart when checking sensors.
Temp
(
º
F)
Resistance
(Ohms)
Temperature – Resistance – Voltage For Type III 10 K Ohm Thermistor Sensors
Voltage @
Input (VDC)
Temp
(
º
F)
Resistance
(Ohms)
Voltage @
Input (VDC)
Temp
(
º
F)
Resistance
(Ohms)
Voltage @
Input (VDC)
50
52
54
56
58
30
35
40
45
10
15
20
25
-10
-5
0
5
93333
80531
69822
60552
52500
45902
40147
35165
30805
27140
23874
21094
18655
17799
16956
16164
15385
4.620
4.550
4.474
4.390
4.297
4.200
4.095
3.982
3.862
3.737
3.605
3.470
3.330
3.275
3.217
3.160
3.100
Thermistor Sensor Testing Instructions
Use the resistance column to check the thermistor sensor while disconnected from the controllers (not powered).
76
78
80
82
84
72
73
74
75
68
69
70
71
60
62
64
66
11136
10878
10625
10398
10158
9711
9302
8893
8514
14681
14014
13382
12758
12191
11906
11652
11379
3.042
2.985
2.927
2.867
2.810
2.780
2.752
2.722
2.695
2.665
2.635
2.607
2.577
2.520
2.465
2.407
2.352
86
88
90
95
100
105
110
115
120
125
130
135
140
145
150
8153
7805
7472
6716
6047
5453
4923
4449
4030
3656
3317
3015
2743
2502
2288
1.469
1.369
1.274
1.185
1.101
1.024
0.952
2.297
2.242
2.187
2.055
1.927
1.805
1.687
1.575
nus) lead on GND terminal and the “+”(plus) lead on the sensor input terminal being investigated.
Use the voltage column to check sensors while connected to powered controllers. Read voltage with meter set on DC volts. Place the “-”(mi-
If the voltage is above 5.08 VDC, then the sensor or wiring is “open.”
If the voltage is less than 0.05 VDC, the sensor or wiring is shorted.
28
WMVAV Controller
Technical Guide
OE271 Duct Static Pressure Sensor
Pressure
@
Sensor
(“ W.C.)
2.10
2.20
2.30
2.40
2.50
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
0.60
0.70
0.80
0.90
1.00
1.10
1.20
0.00
0.10
0.20
0.30
0.40
0.50
Voltage
@
Input
(VDC)
0.25
0.33
0.40
0.48
0.55
0.63
0.70
0.78
0.85
0.93
1.00
1.08
1.15
1.23
1.30
1.38
1.45
1.53
1.60
1.68
1.75
1.83
1.90
1.98
2.05
2.13
Pressure
@
Sensor
(“ W.C.)
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.60
4.70
4.80
4.90
5.00
OE271 Pressure Sensor Testing Instructions
Use the voltage column to check the Duct Static Pressure Sensor while connected to powered controllers. Read voltage with meter set on DC volts. Place the “-”(minus) lead on GND terminal and the “+”(plus) lead on the 0-5 pin terminal on (JP1) with the jumper removed. Be sure to replace the jumper after checking.
Voltage
@
Input
(VDC)
3.18
3.25
3.33
3.40
3.48
3.55
3.63
3.70
3.78
3.85
3.93
4.00
2.65
2.73
2.80
2.88
2.95
3.03
3.10
2.20
2.28
2.35
2.43
2.50
2.58
OE258 Building Pressure Sensor
Pressure
@
Sensor
(“ W.C.)
-0.12
-0.11
-0.10
-0.09
-0.08
-0.07
-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0.00
-0.19
-0.18
-0.17
-0.16
-0.15
-0.14
-0.13
-0.25
-0.24
-0.23
-0.22
-0.21
-0.20
Voltage
@
Input
(VDC)
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
2.10
2.20
2.30
2.40
2.50
Pressure
@
Sensor
(“ W.C.)
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20
0.21
0.22
0.23
0.24
0.25
OE258 Building Pressure Sensor Testing Instructions
Use the voltage column to check the Building Static Pressure Sensor while connected to a powered expansion board. Read voltage with meter set on DC volts. Place the “-”(minus) lead on terminal labeled GND and the “+” lead on terminal AIN4 on the Analog Input/Output Expansion Board.
Voltage
@
Input
(VDC)
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.60
4.70
4.80
4.90
5.00
3.20
3.30
3.40
3.50
3.60
3.70
3.80
2.60
2.70
2.80
2.90
3.00
3.10
WMVAV Controller
29
Appendix
Technical Guide
Humidity
Percentage
(RH)
16%
18%
20%
22%
24%
0%
2%
4%
6%
8%
10%
12%
14%
Voltage
@
Input
(VDC)
1.00
1.08
1.16
1.24
1.32
1.40
1.48
1.56
1.64
1.72
1.80
1.88
1.96
OE265 Relative Humidity Transmitters – Humidity vs. Voltage
Humidity
Percentage
(RH)
42%
44%
46%
48%
50%
26%
28%
30%
32%
34%
36%
38%
40%
Voltage
@
Input
(VDC)
2.68
2.76
2.84
2.92
3.00
2.04
2.12
2.20
2.28
2.36
2.44
2.52
2.60
OE265-03 Relative Humidity Sensor
Testing Instructions:
Use the voltage column to check the Humidity Sensor while connected to a powered expansion board. Read voltage with meter set on DC volts.
Place the “-”(minus) lead on terminal labeled GND and the “+” lead on terminal AIN4 on the Analog Input/Output Expansion Board.
Humidity
Percentage
(RH)
68%
70%
72%
74%
76%
52%
54%
56%
58%
60%
62%
64%
66%
Voltage
@
Input
(VDC)
3.72
3.80
3.88
3.96
4.04
3.08
3.16
3.24
3.32
3.40
3.48
3.56
3.64
Humidity
Percentage
(RH)
78%
80%
82%
84%
86%
88%
90%
92%
94%
96%
98%
100%
Voltage
@
Input
(VDC)
4.12
4.20
4.28
4.36
4.44
4.52
4.60
4.68
4.76
4.84
4.92
5.00
30
WMVAV Controller
Notes
Technical Guide
WMVAV Controller
31
Form: WM-WMVAV-TGD-01A Printed in the USA
All rights reserved
May 2004
Copyright 2004
WattMaster Controls Inc.
·
8500 NW River Park Drive
·
Parkville MO
·
64152
Phone (816) 505-1100 E-mail: [email protected]
Fax (816) 505-1101
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