Bard MV4000 User Manual

INSTALLATION INSTRUCTIONS & replacement parts list

MV4000 SERIES SOLID STATE DUAL UNIT LEAD/LAG CONTROLLER for use with H-Series

Wall Mount Air Conditioners

	Bard Manufacturing Company, Inc.	Manual No.:	2100-571A
	Bryan, Ohio 43506	Supersedes:	2100-571
	Since 1914...Moving ahead, just as planned.	File:	Vol. III Tab 19
		Date:	07-25-12

	Manual	2100-571A
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CONTENTS

Getting Other Information and Publications	3
MV4000 General Information
Shipping Damage....................................................	4
General....................................................................	4
Theory of Operation.................................................	4
Controller Certifications...........................................	4
Specifications/Features for MV4000 Series Controller
MV4000 Controller...................................................	5
Mounting the Controller
Installation Instructions............................................	5
Temperature Sensors
Two Optional Sensor Inputs.....................................	5
Temperature Sensor Logic
Using Multiple Sensors............................................	5
Controller Input/Output Specifications
MV4000 Controller Connections..............................	6
Located in the MV4000 Panel Box
Unit #1 & Unit #2 Terminal Block.............................	6
Specifications/Features for Alarm Boards
MV4000-B with Enhanced Version Alarm................	7
Low Voltage Field Wiring
Circuitry in the MV4000...........................................	7
Controller Grounding
Earth ground............................................................	7
Controller Power-Up
Time Delay on Power-Up.........................................	7
Fire Suppression Circuit
Disabling the MV4000..............................................	8
Staging Delay Periods
Stages 1 - 4.............................................................	8
Blower Operation
Various Blower Options...........................................	8
Advance (Swap) Lead/Lag Unit Feature
Manual Switching of Units.......................................	8
Accelerate Timer Feature
Testing the Timer Function.......................................	8
General Programming Overview
Buttons & Function..................................................	9
Humidity Control Option
Adding Optional Humidity Control..........................	10
Cooling Operating Sequences
for Alternating Lead/Lag/Lead/Lag Config........	10-11
Cooling Operating Sequences
for Non-Alt Lead/Lead/Lag/Lag Config.............	11-12
Heating Sequence of Operation........................	12-13
Specifications Opt. Remote Comm. Board
CB4000 Communications Board......................	13-14
Controller Wiring
Refer to Connection Diagram................................	15
Security (Locking) Feature
Locking and Unlocking the MV4000......................	15
Generator Run / Economizer Shutdown Feature
Standby Generator Disable Operation...................	15
Backup DC Power Connection
Input Connections Available..................................	15

Econ. Failure & 2-Compressor Run Alarm...........		24
Alarm Wiring............................................................		24
2nd Stage Cooling Alarm.......................................		25
Refrigerant Pressure Alarms.................................		25
Emergency Ventilation Sequence..........................		25
Programming Instructions.....................................		28
Figures
Figure 1	Controller Connections 1-Stage (H**A/L
Series) A/C w/No Economizers.................................		16
Figure 2	Controller Connections 2-Stage (HA*S/HL*S
Series) A/C - No Economizers..................................		17
Figure 3	Controller Connections 1-Stage (H**A/L
Series) A/C - No Econ. w/Alarm Board & CB4000
Comm. Board............................................................		18
Figure 4	Controller Connections 2-Stage (HA*S/HL*S
Series) A/C - No Econ. w/Alarm Board & CB4000
Comm. Board............................................................		19
Figure 5	Controller Connections 1-Stage (H**A/L
Series) A/C w/ECONWMT Econ...............................		20
Figure 6	Controller Connections 2-Stage (HA*S/HL*S
Series A/C w/ECONWMT Econ................................		21
Figure 7	Controller Connections 1-Stage (H**A/L
Series) A/C w/ ECONWMT Econ. & w/Alarm Board &
CB4000 Comm. Board .............................................		22
Figure 8	Controller Connections 2-Stage (HA*S/HL*S
Series A/C w/ECONWMT Econ. & w/Alarm Board &
CB4000 Comm. Board .............................................		23
— — —	Alarm LED Display Board........................	24
Figure 9	Alarm Board Connections for Normally
Closed "NC" Open-On-Alarm Strategy.....................		26
Figure 10	Alarm Board Connections for Normally Open
"NO" Close-On-Alarm Strategy.................................		27
— — —	MV4000 Label..........................................	29
Figure 11	Parts List Description Diagram................	30
Tables
Table 1	Hook-Up Diagram Selection....................	16
Table	Parts List..................................................	31

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Getting Other Information and Publications

These publications can help you install the air conditioner or heat pump. You can usually find these at your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard.

Standard for the Installation...............	ANSI/NFPA 90A
of Air Conditioning and
Ventilating Systems
Standard for Warm Air Heating..........	ANSI/NFPA 90B
and Air Conditioning Systems

For more information, contact these publishers:

ACCA	Air Conditioning Contractors of America
	1712 New Hampshire Avenue, NW
	Washington, DC 20009
	Telephone: [phone]
	Fax: [phone]

ANSI	American National Standards Institute
	11 West Street, 13th Floor
	New York, NY 10036
	Telephone: [phone]
	Fax: [phone]

ASHRAE American Society of Heating, Refrigerating,

and Air Conditioning Engineers, Inc.

1791 Tullie Circle, N.E.

Atlanta, GA 30329-2305

Telephone: [phone]

Fax: [phone]

BARD Bard Manufacturing Company, Inc.

1914 Randolph Drive

Bryan, OH 43506

Telephone: [phone]

Fax: [phone]

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** IMPORTANT **

The equipment covered in this manual is to be installed by trained, experienced service and installation technicians. Please read entire manual before proceeding.

SHIPPING DAMAGE

Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent.

GENERAL

These instructions explain the operation, installation and troubleshooting of the MV4000 Series controller.

All internal wiring is complete. Only attach low voltage field wiring to designated terminal strips.

The MV4000 is for use with units with or without economizers, can be configured for use with heat pumps, and has a dehumidification control feature if an optional humidity controller is connected.

Each unit should be sized to handle the total load of the structure if 100% redundancy is required.

The MV4000 controller is suitable for both 50 and 60

HZ operation, and is fully configurable such that it can be used in virtually any installation. See Controller Programmable Features and Default Settings.

THEORY OF OPERATION

The controller is used to control two wall mount air conditioners from one control system. It provides total redundancy for the structure and equal wear on both units. It can be used with units with or without economizers and it is recommended that both units be equipped alike.

The MV4000 controller can be configured for alternative (lead/lag/lead/lag) sequence, which is default setting. It can be changed to non-alternating (lead/lead/ lag/lag) sequence as required for special applications or user preference.

The MV4000 is equipped with the B alarm board.

Form C dry contact alarm relays are used, offering both NO and NC switching to meet the user’s specific alarm protocol, providing complete flexibility to meet any user's requirements. All alarm actuations are individually indicated on the controller front panel.

There is an Ethernet based remote communication option that can be either factory or field installed. See section on Communication Module.

controller certifications

The MV4000 main controller board, alarm board, optional communication module, and remote sensors have undergone extensive testing for immunity

and emissions. This system is FCC-compliant, in accordance with CE requirements, and meets the following standards:

MV4000 Series

Master Controller

This device complies with FCC Rule Part 15, Subpart B, Class A. Operation is subject to the following two conditions:

1.This device may not cause harmful interference

2.This device must accept any interference received, including that which may cause undesired operation.

This device complies with CE Standards EN55011/ EN50081 and EN55024 for ISM Equipment, Class A.

This ISM device also complies with Canadian ICES – 001.

Bard Manufacturing Company, Inc.

Bryan, OH 43506

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SPECIFICATIONS/FEATURES FOR mv4000-B CONTROLLER

MV4000 Basic Controller

•Input power: 18-32 VAC, 60/50Hz, power is supplied from

A/C #1 and/or A/C #2

•Isolation circuitry: no line or low voltage phasing required •Backup power: connection for -24 VDC or -48 VDC (-20 to

-56V) maintains microprocessor operation, front panel indication & alarm relay operation during commercial power outages.

•Digital display: 4-character LCD •Temperature display: F or C

•HVAC outputs: Form A (NO) relays (1A @ 24 VAC) •Cooling control stages:

2 for each A/C unit (4 total) when configured for economizers 1 for each A/C unit (2 total) when configured for no economizers

•Heating Control stages:

1 for each A/C unit, 2 for each heat pump if so configured

•Dehumidification circuit: requires optional humidity controller as input signal

•Operating temperature range: 0 to 120F (-18 to 49C) •Storage temperature range: -20 to 140F (-29 to 60C) •Temperature accuracy: +/- 1F from 60-85F (16-30C)

+/- 1% outside 60-85F •Lead/lag changeover time: 0 to 30 days •Timing accuracy: +/- 1%

•Inter-stage time delay: 10 seconds between stages •Inter-stage differential:

Stage 1 to 2 - Range 2-6F, default is 4 Stage 2 to 3 - Range 2-3F, default is 2 Stage 3 to 4 - Range 2-3F, default is 2

•On-Off differential: 2F (1C) is standard, 4F (3C) when

“excessive cycling” mode is enabled

•Cooling set point range: 65 to 90F (18.3 to 32.2C) •Comfort setting-Cooling 72F (22C), Heating 68F(20C), for 1 hour •Dead band (difference between cooling and heating set points): 2F to 40F (1.1C to 22.2C)

•Fire/smoke interface: standard NC circuit jumper, remove for connection to building system control, shuts down both A/C units immediately

•Memory: EEPROM for set point and changeable parameters (maintains settings on power loss)

•Space temperature sensors: 1 local is standard, will accept up to 2 optional 25' remote sensors, Bard part number 8612-023. When multiple sensors are used, temperatures are averaged

•Controller Enclosure: 20-gauge pre-painted steel, 9.25"W x 20.875"H x 3.00"D, hinged cover, twenty four (24) .875" diameter electrical knockouts

•LEDs for basic controller: Lead unit, Cooling stages 1 through 4, Heating Stages 1 – 4, Dehumidification operation •Six (6) Push-button controls: On/Off switch-Change lead unit-Increase & Decrease set points-Program/Save-Comfort.

mounting the controller

Included in the controller carton is the controller and installation instructions.

The controller should be installed on a vertical wall approximately four (4) feet above the floor-away from drafts & outside doors or windows. Four (4) mounting holes are provided for mounting to the wall and 7/8" holes for conduit connections are provided in both the base, sides & top of the controller.

temperature sensors

The standard (local) temperature sensor has 12" leads and comes installed from the factory.

A secondary sensor is located internally on the main controller board and serves as a reference and back-up sensor to the local sensor. Any differential of +/- 12F between the on-board and local sensor will cause the controller to use the local sensor as its point of reference. If the differential is greater than 12F then the controller will check to determine the on-board sensor is reading a temperature that is between the SP (set-point) plus 12F and the SP minus the DB (dead-band) minus 12F. If it is the on-board sensor will become the valid sensor reading and the controller will ignore the local sensor reading. If it is not then the controller will still use the local sensor reading. This is to add additional level of operational capability in the rare event the local sensor fails. If the controller is operating in this mode it is indicated by the lower left decimal point flashing in the display. Note: for purposes of testing when the local sensor is manually driven higher or lower by applying warm or cool water to the probe the on-board sensor is inhibited for the first

30-minutes following power up, or when power is cycled off and back on.

The controller is designed to accept 1 or 2 additional sensors and those have 25-foot leads. The Bard part number for the optional sensor with 25-foot leads is 8612-023. These can be installed as required in the structure to address hot spots, barriers to airflow, etc.

It is recommended that the sensor lead wires be installed in conduit for protective purposes.

The highest reading of any connected sensor will be used for high temperature alarm and the lowest reading sensor will be used for low temperature alarm.

Note: All sensors are polarity sensitive. The copper lead must connect to terminal CU, and the silver lead to AG. Sensors are solid state, not RTD. Use only sensors supplied by Bard. Sensor leads can be extended up to 200 feet. Use 18-gauge twisted pair with soldered connections.

temperature sensor logic

The standard local (LSEn) sensor monitors the temperature at the controller location. If this is the only sensor connected, it will control the temperature read-out, the space (building) temperature, and also be used for

Low and High Temperature alarm functions.

If one or more remote sensors are installed and connected (Rem 1 or Rem 2), the temperature read-out will display and the building will be controlled to an average of all connected sensors. If there is more than 10F difference from the highest to the lowest connected sensor, the actual control will be governed by the hottest sensor for cooling and the coldest sensor for heating.

If multiple temperature sensors are used, the High and

Low temperature alarms will be governed by the average of the connected sensors.

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basic MV4000 CONTROLler input/output specifications

MV4000 controller connections

Located on Main Controller Board

	Unit #1	C – 24VAC common
		R – 24VAC hot
		G – fan (Form A, NO)
		Y1 – 1st-stage cool (Form A, NO)
		Y2 – 2nd-stage cool (Form A, NO)
	Unit #2	W – heat (Form A, NO)
		C – 24VAC common
		R – 24VAC hot
		G – fan (Form A, NO)
		Y1 – 1st-stage cool (Form A, NO)
		Y2 – 2nd-stage cool (Form A, NO)
	F1-F2	W – heat (Form A, NO)
		Fire/smoke interface
	48Vdc	Shipped with jumper installed (a)
		Back-up power input
		-24Vdc or –48Vdc
	Local	-20V to –56V range	NOTE:
		Main sensor, 12-inch leads
			Sensors are
		CU – copper, AG – silver
	Rem 1	Polarity sensitive	solid state,
		Optional remote indoor sensor	not RTD.
		CU – copper, AG – silver	Use Bard
		Polarity sensitive
	Rem 2		sensors only.
		Optional remote indoor sensor
		CU – copper, AG – silver
	H1-H2	Polarity sensitive
		Humidity controller input
		Requires optional controller
		Field installed

Advance Input used to remotely toggle lead/lag change

(a)These connections require either jumper or Normally Closed (NC) relay contact at the Fire/Smoke and Generator interface for Controller to function.

Note: All alarm and output relays are dry contacts rated

1A @ 24 VAC.

Note: All alarm relay outputs have 10-second delay before issuing to protect against nuisance alarm signals.

located in the MV4000 panel box

Unit #1 Terminal Block

R – 24VAC hot from Unit

C – 24VAC common from Unit Y – Compressor Signal to Unit

A – Compressor Signal from Economizer 4 – Dirty Filter Alarm from Unit

5 – Dirty Filter Alarm from Unit

6 – No Connection (Do Not Use)

8 – Economizer Fail from Unit

9 – Economizer Fail from Unit

F – Economizer Shutdown Output

Unit #2 Terminal Block

R – 24VAC hot from Unit

C – 24VAC common from Unit Y – Compressor Signal to Unit

A – Compressor Signal from Economizer 4 – Dirty Filter Alarm from Unit

5 – Dirty Filter Alarm from Unit

6 – No Connection (Do Not Use)

8 – Economizer Fail from Unit

9 – Economizer Fail from Unit

F – Economizer Shutdown Output

Gen Run/Econ Shutdown Terminal Block(a)

Gen Run Input

Economizer Fail Terminal Block

Alarm Output

Alarm relays can be wired for NO (close on alarm) or NC (open on alarm) strategy. Alarm relays can be used individually if there are enough available building alarm points, or can be arranged into smaller groups or even a single group so that all alarm capabilities can be utilized. When multiple alarms are grouped together and issued as a single alarm there will be no off-site indication of which specific problem may have occurred, only that one of the alarms in the group has been triggered.

The individual alarm problem will be displayed on the LED display on face of the controller.

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SPECIFICATIONS/FEATURES FOR

MV4000-B & -BC Controller ALARMS

Inputs
Lockout 1	2, 3 – input from HVAC #1
Lockout 2	2, 3 – input from HVAC #2
Outputs
Smoke/Fire	Form C (SPDT)
Lockout 1	Form C (SPDT)
	Refrigerant alarm HVAC #1
Lockout 2	Form C (SPDT)
	Refrigerant alarm HVAC #2
Power Loss 1	Form C (SPDT)
	Power loss HVAC #1
Power Loss 2	Form C (SPDT)
	Power loss HVAC #2
Low Temp	Form C (SPDT)
	Low temperature alarm
High Temp 1	Form C (SPDT)
	High temperature alarm #1
High Temp 2	Form C (SPDT)
	High temperature alarm #2
Controller	Form C (SPDT)
	Controller failure alarm
Econ 1	E, F - Form A (NO)
	See note (b)
Econ 2	E, F - Form A (NO)
	See note (b)
2nd Stage (c)	Form C (SPDT)
	2nd-stage cooling alarm

(b)Make these connections to terminals E & F in HVAC 1 and 2 respectively if desired to have economizers open for emergency ventilation at High Temp Alarm #2 setpoint condition.

(c)For units with 2-stage compressors, 2nd stage cooling alarm activates on cooling Stage 3 initiation.

2nd Compressor	Form A (NC)
Dirty Filter	Form A (NC)
	4, 5 – Input from Unit
Economizer Fail	Form A (NC)
	8, 9 – Input from Unit

LOW voltage field wiring

The MV4000 is powered from the air conditioners that it is controlling, 24 VAC (18-32V) low voltage only.

Circuitry in the MV4000 isolates the power supplies of the two air conditioners so that no back feeds or phasing problems can occur. Additionally, if one air conditioner loses power, the MV4000 and the other air conditioner are unaffected and will continue to operate normally.

Connect the low voltage field wiring from each unit per the low voltage field wiring diagrams in Section on

“Controller Wiring”. note: Maximum of 18-gauge control wiring should be used. Using heavier gauge wiring can create excessive stress on the control board as door is opened and closed. Create a wiring loop so the door can open and close without stressing terminal blocks.

controller grounding

A reliable earth ground must be connected in addition to any grounding from conduit. Grounding lugs are supplied for this purpose.

controller power-up

Whenever power is first applied to the controller, there is a twenty (20) second time-delay prior to any function (other than display) becoming active. This time-delay is in effect if the controller On/Off button is used when 24VAC from air conditioners is present, and also if controller is in “ON” position and 24VAC from air conditioners is removed and then restored.

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fire suppression circuit

To disable the MV4000 and shut down both air conditioners, terminals F1 and F2 may be used. The F1 and F2 terminals must be jumpered together for normal operation. A normally closed (nc) set of dry contacts may be connected across the terminals and the factory jumper removed for use with a field-installed fire suppression system. The contacts must open if a fire is detected. See appropriate connection diagram - Figures 1, 2 or 3 for this connection. Contacts should be rated for pilot duty operation at 2 amp 24VAC minimum. Shielded wire (22-gauge minimum) must be used, and the shield must be grounded to the controller enclosure.

important note: Older Bard R-22 models employ an electronic blower control that has a 60-second blower off-delay. Current production R-410A models do not use a blower off-delay device and the remainder of this (paragraph) does not apply. In order to have immediate shutdown of the blower motor, in addition to disabling the run function of the air conditioners will require a simple wiring modification at the blower control located in the electrical control panel of the air conditioners being controlled by the lead/lag controller. To eliminate the 60-second blower off-delay, disconnect and isolate the wire that is factory-connected to the “R” terminal on the electronic blower control, and then connect a jumper from the “G” terminal on the blower control to the “R” terminal on the blower control. The electronic blower control will now function as an on-off relay with no off-delay, and the blower motor will stop running immediately when the F1-F2 fire suppression circuit is activated (opened).

staging delay periods

The following delays are built in for both cooling & heating:

Stage 1 – 0 seconds for blower (if not already on as continuous)

10 seconds for cooling or heating output

Stage 2 – 10 seconds after Stage 1 for blower

10 additional seconds for cooling or heating output

Stage 3 – 10 seconds after Stage 2 Stage 4 – 10 seconds after Stage 3

Note: For cooling Stages 1 and 2, the stage LED will blink for 10 seconds while the cooling output is delayed after that stage is called for. There is also a delay after the stage is satisfied, and after the LED stops blinking, the stage will turn off. There is a minimum 10-second delay between stages 2 & 3, and 3 & 4, but no delayed output when stage is turned on or off, and LED for those stages will not blink.

blower operation

The controller can be configured to have main HVAC blowers cycle on and off on demand; have all blowers run continuously; or have the lead unit blower run continuously with the lag unit blower cycling on demand. Default setting is the blower on the lead unit operates continuously. There is also an option to have all blowers cycle on if one remote sensor is connected, and a temperature difference of more than 5F between any two sensors is observed. This helps to redistribute the heat load within the structure and should reduce compressor operating time.

When any of the stages are satisfied, the stage LED will blink for ten (10) seconds before the stage is actually turned off.

Advance (Swap) lead/Lag unit feature

Pressing the Advance button for one (1) second will cause the lead and lag units to change positions. This may be useful during service and maintenance

procedures. This function can also be done remotely by closing a contact across the Advance terminals on the main board.

accelerate timer feature

Pressing the UP arrow button for five (5) seconds will activate an accelerate (speed-up) mode, causing the normal changeover time increments of days to be reduced to seconds. Example: 7 days becomes 7 seconds. When “ACC” displays, release button.

Whichever LED is on, indicating lead unit will blink over for each second until the controller switches. This is a check for the timer functionality.

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General Programming Overview

MV4000 Controller Buttons and Function

On/Off Button

1.Press and release the On/Off button to turn On controller, 4-character display will illuminate and Lead unit LED will light.

2.Press and release the On/Off button to turn Off controller. Controller will go dark and A/C units will stop.

Comfort Button

1.Press and release the Comfort button to change the Cooling Set Point to 72F and the Heating Set Point to 68F for a period of 1 hour.

2.Set Points will return to the programmed settings automatically after 1 hour.

3.Pressing the Comfort button during the 1 hour period will deactivate the Set Point change.

4.The temperature display will flash the current temperature while in override mode.

Program Button

1.Press the Program button and release it when the message “Prog” appears on the display.

2.Refer to Programming Instructions and follow these commands to change from Default settings.

Advance/Change/Save Button

1.Press and release the Advance button to swap lead and lag unit positions.

2.When in Program mode the Down and Up buttons are used to scroll through the programming steps.

3.A flashing display means that the particular function of that programming step is “set”, and the display will alternate between the step function and the setting.

4.To change the setting press the Change button and the display will stop flashing, allowing change to the setting.

5.Use Down or Up arrows to change setting as desired, and press the Save button and proceed as desired.

6.When done with programming changes press the Program button until display stops flashing and room temperature is shown.

Up and Down Buttons

These buttons are used to change the settings in conjunction with the Advance/Change/Save button when in programming mode.

Controller Programmable Features and Default Settings

	Order /	Description	Range / Choice	Default
	Display
	LSEn	Temperature at local (main) sensor	—	—
	SP	Cooling set point temperature	65 to 90F (18 to 32C)	77F (25C)
	db	Deadband between cooling SP and heating set point	2 to 40F (1 to 24C)	27F (15C)
	r1	Temperature at remote sensor 1 location, if connected	—	—
	r2	Temperature at remote sensor 2 location, if connected	—	—
	cFAn	Continuous blower operation	None, Lead, Both	Lead
	deg	Controller system operates in F or C	F or C	F
	Alt	Alternating Lead-Lag-Lead-Lag sequence or Non-Alternating Lead-Lead-Lag-Lag sequence —	Yes or No	Yes
		Yes = Alternating
	LLCO	Lead-Lag changeover time (Days)	1 - 30 days, or 0 for	7
			disabled
	HP	Heat pump logic enabled — only for 1-stage heat pumps and forces Lead-Lag sequence	Yes or No	No
		(overrides a Non-Alt setting)
	Cbd5	Unit 1 and 2 blowers automatically both run if delta T >5F between any 2 connected sensors	Yes or No	Yes
	OFde	3-minute lead unit & 4-minute lag unit off-delay enabled	Yes or No	No
	crun	Minimum 3-minute compressor runtime enabled	Yes or No	No
	LoAL	Low temperature alarm setpoint	28 to 65F (-2 to 18C)	45F (7.2C)
	HAL1	High temperature alarm level #1 setpoint	70F to 120F (21 to 49C)	90F (32C)
	HAL2	High temperature alarm level #2 setpoint	70F to 120F (21 to 49C)	95F (35C)
	Locd	Controller is locked and no changes can be made. Consult building authority.	If locked, display will show	Unlocked
			Locd if changes attempted
	Inter-Stage Differential
	ISd2	From Stage 1 to Stage 2	2, 3, 4, 5 or 6F	4
	ISd3	From Stage 2 to Stage 3	2 or 3F	2
	ISd4	From Stage 3 to Stage 4	2 or 3F	2
	On/Off Differential (Hysterisis)
	CSon	Turn "On" above SP for Stage 1 Cooling	+1 or 2F	2
	CSoF	Turn "Off" below SP for Stage 1 Cooling	-1, 2, 3 or 4F	-4
		Stage 2, 3 and 4 Cooling automatically set same as Stage 1 decisions
	HSoo	All Heating Stages are equal -/+ on & off differential	-1/+1 or -2/+2	-2/+2
	CoPr	1 or 2-stage compressor, if set to 1 the 2nd stage Cooling Alarm activates on Cooling Call 2,	1 or 2	1
		if set to 2 the 2nd stage Cooling Alarm activates on Cooling Call 3

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humidity control option

Note: This function is not available if controller is configured for heat pump.

The standard air conditioning system can be adapted to perform dehumidification control by addition of a simple humidity controller that closes-on-rise, and is connected to terminals H1 and H2 on the main

controller board. Recommended Bard Part #8403-038 (H600A 1014). Both HVAC units must be equipped with electric heat for this sequence to work properly. See appropriate connection diagram - Figures 1 - 12 for this connection:

1.Temperature control always has priority over dehumidification. If there is any stage of cooling demand active, the dehumidification sequence is locked out.

2.If all stages of cooling are satisfied, and relative humidity is above the set point of humidity controller:

a.The green “Dehumid. Operation” light will come on, and the lag unit compressor and blower will operate until the set point of humidity controller is satisfied (or cancelled by a call for cooling).

b.If the space temperature drops to 67F, the electric heater of the lead unit will cycle to help maintain building temperature. It will cycle off at 69F.

c.If space temperature drops to 64F, the Stage 2 Heating light will come on and the lag unit compressor operating for dehumidification mode will cycle off until the building temperature rises above 65F from 1st stage heat and building load. The green “Dehumid. Operation” light stays on during this sequence, and when Stage 2 Heating light is Off, the compressor is On. The electric heater in lag unit is locked out in dehumidification mode.

Lag unit outputs G, Y1 and Y2 are all switched on during dehumidification sequence. This is true for both alternating and non-alternating controller configurations.

CAUTION

Humidity controller set point should be in 50-60% relative humidity area: Setting controller to lower settings will result in excessive operating time and operating costs for the electric reheat, and in extreme cases could cause evaporator (indoor) coil freeze-up if there are periods of light internal equipment (heat) loading.

COOLING OPERATING SEQUENCES FOR ALternatING LEAD/LAG/LEAD/LAG CONFIGURATION

1.1-Stage Compressor Units No Economizer

1st stage cooling set point is the setting (SP) input into the controller. Factory default is 77F (25C). On a call for cooling the blower of the lead unit will come on immediately (if not already on – See

Blower Operation), and the Stage 1 LED will blink for 10-seconds before going solid, at which time the compressor will start.

2nd cooling set point is 4F (default setting, user selectable 2-6F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – See Blower Operation), and the Stage

2 LED will blink for 10-seconds before going solid, at which time the compressor will start.

3rd and 4th stages are functional outputs but there is nothing to be controlled.

2.2-Stage Compressor Units No Economizer

1st stage cooling set point is the setting (SP) input into the controller. Factory default is 77F (25C). On a call for cooling the blower of the lead unit will come on immediately (if not already on – See Blower Operation), and the Stage 1 LED will blink for 10-seconds before going solid, at which time the lead unit compressor will start in compressor Stage 1 partial capacity operation.

2nd cooling set point is 4F (default setting, user selectable 2-6F) warmer than Stage 1. On a call for 2nd Stage cooling the blower of the lag unit is turned on (if not already on – See Blower Operation), and the Stage 2 LED will blink for 10-seconds before going solid, at which time the lag unit compressor will start in compressor Stage 1 partial capacity operation.

3rd cooling set point is 2F (default setting, user selectable 2-3F) warmer than Stage 2. On a call for 3rd Stage cooling the Stage 3 LED comes on solid (no delay), and the lead unit compressor will switch to compressor Stage 2 full capacity operation.

4th cooling set point is 2F (default setting, user selectable 2-3F) warmer than Stage 3. On a call for 4th Stage cooling the Stage 4 LED comes on solid (no delay), and the lag unit compressor will switch to compressor Stage 2 full capacity operation.

Manual	2100-571A
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