Bard Manufacturing | Bard Manufacturing
Instruction Manual for Bard models including: WGSCRVS-3C, WGSCRVS-5C, Commercial Room Ventilator, Room Ventilator, WGSCRVS-3C, Ventilator
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DocumentDocumentINSTALLATION INSTRUCTIONS Commercial Room Ventilator with Exhaust and CO2 Modulation (Optional) Models: WGSCRVS-3C WGSCRVS-5C For Use with Bard Single Stage W**G4 Units Bard Manufacturing Company, Inc. Bryan, Ohio 43506 www.bardhvac.com Manual : 2100-757 Supersedes: NEW Date: 12-7-21 Page 1 of 17 CONTENTS General Information Commercial Room Ventilator Model Nomenclature... 3 General Information.............................................. 3 Unpacking ........................................................... 3 Description .......................................................... 3 Features .............................................................. 3 Sequence of Operation.......................................... 3 Installation Basic Installation ................................................. 6 Ventilator Checkout .............................................. 9 WGCRVS Sequence of Operation............................ 9 Figures Figure 1 Call for Blower Operation w/o Ventilation ..4 Figure 2 Call for Ventilation ................................ 5 Figure 3 Removal of Vent Option Panel ................ 6 Figure 4 Loose Piece Wire Harness Plug Install..... 7 Figure 5 Ventilator Installed in Unit ..................... 8 Figure 6 CRV Control Board .............................. 10 Figure 7 8403-096 CO2 Sensor Set Up .............. 11 Figure 8 Thermostat Wiring Diagram .................. 15 Figure 9 Thermostat Wiring Diagram .................. 16 Figure 10 CRVS Wiring Diagram .......................... 17 Charts W24G CRV Airflow (Low, Medium, High)............... 12 W30-36G CRV Airflow (Low, Medium, High).......... 13 W42-60G CRV Airflow (Low, Medium, High).......... 14 Manual 2100-757 Page 2 of 17 GENERAL INFORMATION Commercial Room Ventilator Model Nomenclature WGCRVS 3 C Commercial Room Ventilator Chassis Size 3 W24-36G Models 5 W42-60G Models Revision General Information The ventilator should only be installed by a trained heating and air conditioning technician. These instructions serve as a guide to the technician installing the ventilator package. They are not intended as a stepby-step procedure with which the mechanically inclined owner can install the package. The ventilator housing is shipped in one carton which contains the electrical harness, miscellaneous hardware and installation instructions. Unpacking Upon receipt of the equipment, be sure to compare the model number found on the shipping label with the accessory identification information on the ordering and shipping document to verify that the correct accessory has been shipped. Inspect the carton housing of each ventilator as it is received. Before signing the freight bill, verify that all items have been received and that there is no visible damage. Note any shortages or damage on all copies of the freight bill. The receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier's agent. Concealed damage not discovered until after loading must be reported to the carrier within 15 days of its receipt. Description The ventilators are designed to be used with Bard 2 - 5 ton single stage wall mount gas electric units. They are electromechanical vent systems designed to provide fresh air to meet indoor air quality standards with built in exhaust provisions. Features · One piece construction: Easy to install with no mechanical linkage adjustment required. · Exhaust air damper: Built in with positive closed position. Provides exhaust air capability to prevent pressurization of tight buildings. · Actuator motor 24 volt, power open, spring return with built-in torque limiting switch. · Solid state control board can be used for ON/OFF or 2-10VDC operation. Timed pre-purge feature to provide increased ventilation before occupancy. Potentiometers used to set blade position for ON/ OFF ventilation amount. · Provides up to 75% of outside air. Sequence of Operation When no ventilation call is present, ventilation damper remains closed and conditioned air is 100% return air (see Figure 1 on page 4). On a call for ventilation, commercial room ventilator (CRV) opens to position set by minimum position potentiometer and energizes comfort air blower (see Figure 2 on page 5). Manual Page 2100-757 3 of 17 FIGURE 1 Call for Blower Operation without Ventilation Manual 2100-757 Page 4 of 17 FIGURE 2 Call for Ventilation Manual Page 2100-757 5 of 17 INSTALLATION Basic Installation 1. Unpack the ventilator assembly which includes the integral ventilator with attached electrical harness and miscellaneous hardware. WARNING Open and lock unit disconnect switch before installing this accessory to prevent injury or death due to electrical shock or contact with moving parts. Turn thermostat to off. 2. Open the front door. Remove and save vent option panel from wall mount unit (see Figure 3). 3. Remove and save existing unit air filter and screw from front center grille (see Figure 5 on page 8 for screw location). 4. Remove and discard the exhaust cover plate. 5. Replace the exhaust cover plate with screen that is included with the kit. 6. Install loose piece wire harness shipped with kit (as shown in Figure 4). FIGURE 3 Removal of Vent Option Panel FRONT DOOR EXHAUST COVER PLATE VENT OPTION PANEL Manual 2100-757 Page 6 of 17 VENT TERMINAL RIGHT FRONT CORNER MMIISS-2-42146 16 7/8" BUSHING INTO CONTROL PANEL FIGURE 4 Loose Piece Wire Harness Plug Install ROUTE WIRES THROUGH WIRE MOUNT, AND INTO HOLE AT REAR OF UNIT INTO LOW VOLTAGE TERMINAL BLOCK AREA PLUG TO SECURE INTO FILTER TRAY 7. Open control panel to gain access to unit low voltage terminal block. 8. Route electrical harness leads through the 7/8" bushing in control panel (Figure 4) into low voltage control box. 9. Connect leads with fork terminal to corresponding points on terminal strip. (See wiring diagrams later in this manual or on ventilator.) Plug connector into corresponding hole in filter rack (see Figure 4). 10. Close control panel cover. 11. Insert ventilator into the unit (see Figure 5). IMPORTANT: Position front lip of ventilator on top of front grille and condenser partition (see Figure 5 inset). This is important to ensure proper drainage of any water entering damper assembly. 12. Plug mating connector from CRV into connector in filter rack (see Figure 5). See page 9 to proceed to ventilator checkout procedure. MMISIS-2-2441155 A Manual Page 2100-757 7 of 17 FIGURE 5 Ventilator Installed in Unit Mist Eliminator FIGURE 5 INSET Install pin plug in filter partition and wire per diagram Plug mating plug from WGCRV into plug in filter partition When installing WGCRV, position so that hole in front lip is centered over hole in condenser grill to insert a self-drilling screw. Manual 2100-757 Page 8 of 17 MIS-1464B Ventilator Checkout Blade Adjustment for Desired Ventilator Air The amount of ventilation air supplied by the commercial room ventilator is dependent on four factors. a. Return air duct static pressure drop b. Supply air duct static pressure drop c. Indoor blower motor speed d. Damper blade open position setting To determine the amount of fresh air that will be supplied to the structure, first determine the pressure drops of the supply and return air ducts. For free blow application with return air filter grille and supply grille, assume .05 supply static and .10 return static. Determine on what speed the evaporator motor is running. Refer to the graphs found on pages 12-14 to determine the blade setting necessary to achieve the ventilation air required at the supply and return static duct pressure drops that are applicable. NOTE: The ventilation air shown in the graphs on pages 12-14 is without the condenser fan running. When the condenser fan is running, the ventilation air will increase slightly. WGCRVS Model Checkout 1. Open blower door and remove filters to gain access to the CRV control board (8201-167) located behind the front fill partition on top of the ventilator. 2. Resupply power to unit. 3. Energize the evaporator blower by switching thermostat to the manual fan position with heat/ cool in OFF position. 4. Ventilator should open to the position set by the OCC potentiometer on the CRV control board (see Figure 6 on page 10). Cycle OCC potentiometer to full open through full close. Observe damper blade operation throughout travel to assure free, unobstructed movement. 5. Adjust OCC potentiometer until desired blade setting is reached with power applied to unit. See the graphs found on pages 12-14 for required blade setting versus ventilator air for the unit installed. 6. De-energize the evaporator blower. Damper blade should close. 7. Re-install filter. WGCRVS Sequence of Operation This ventilation option includes a control board with blade positioning potentiometers along with an input for a 2-10V input signal (see Figure 6 on page 10). Adjustable potentiometers: "PP" Potentiometer setting: This potentiometer can be used to adjust the blade setting for outdoor air intake during a pre-purge cycle. The pre-purge cycle time is based on the setting of the pre-purge timer. "OCC" Potentiometer setting: This potentiometer can be used to adjust the blade setting for outdoor air intake when the "A" terminal is energized on the low voltage terminal strip indicating occupancy or demand. "Y1" Potentiometer setting: Not applicable on this model. "Y2" Potentiometer setting: Not applicable on this model. Pre-Purge Feature Pre-purge is used to ventilate a specified CFM amount before occupants enter the room or structure. The control board has a built-in pre-purge timer that can be set to 30, 60 and 90 minute intervals by moving the jumper (see Figure 6 on page 10). This timer will start when the jumper is installed and the A terminal is energized on the low voltage terminal strip. Blade adjustment can be made on the PP potentiometer. Once the timer has timed out, the board will default to the occupied setting and this blade position can be adjusted on the OCC potentiometer. If the timer is set to 0 (off--shipped position), the occupied setting is instantaneous and the pre-purge setting (PP) is no longer in the sequence. Occupied Setting Occupied is used to ventilate a specified CFM amount when occupants enter the room or structure. The control board will energize the occupied setting after the pre-purge cycle, or if pre-purge is disabled immediately when the A terminal is energized on the low voltage strip. Blade adjustment can be made on the OCC potentiometer. Y1 Setting Not applicable on this model Y2 Setting Not applicable on this model 2-10V Operation A CO2 sensor or other device sending a 2-10V signal can be used to control the damper motor. Two control methods are available to control the damper motor: · Method 1: The control board will accept a 2-10VDC signal with a resistive load greater than 5000 ohms. Bard CO2 sensor part #8403-096 can be used when the 2-10V output is connected to Manual Page 2100-757 9 of 17 FIGURE 6 CRV Control Board POT "PP" PRE-PURGE SET FOR PREOCCUPANCY terminal 4 on the unit low voltage terminal strip. The occupied OCC potentiometer setting must be set to the off position for total modulation. The OCC potentiometer can be used to maintain a minimum blade position when A is energized. · Method 2: The damper motor will accept a 2-10VDC signal with a resistive load less than 5000 ohms. This method involves bypassing the control board and powering the motor directly from the device providing the 2-10VDC modulating signal. The gray wire connected to CO2 V IN on the control board must be spliced with the white wire ran to the damper motor (V OUT on control board). During 2-10VDC operation with A energized and prepurge timed operation active, DC voltage signaling occupancy from a source such as a CO2 sensor will increase ventilation amounts as needed. POT "OCC" OCCUPIED SETTING TURN OFF FOR C02 FULL MODULATION POT "Y1" SETTING FOR STAGE ONE COOLING Y1 WILL OVERRIDE OCC SETTING FOR 2ND STAGE COOLING OR BLADE POSITION WHEN Y2 IS ENERGIZED PRE-PURGE TIMER MIS-4362 Manual 2100-757 Page 10 of 17 FIGURE 7 8403-096 CO2 Sensor Set Up PRESS UP AND DOWN ARROWS TO ENTER CONFIGURATION MODE USE ARROWS TO SELECT SETTING. PUSH MIDDLE BUTTON TO CHANGE. CONTROLLER WILL SHOW SET. NOTE: MENU DIP SWITCH MUST BE IN "ON" POSITION #5 TO CHANGE ANY SETTINGS WITH THE SIDE BUTTONS. TO LOCK THE CO2 CONTROLLER MOVE DIP SWITCH TO "OFF" AFTER IT HAS BEEN CONFIGURED. ON ON ON OFF OFF OFF 1 2 3 4 5 6 DIP SWITCHES MUST BE POSITIONED AS SHOWN FOR PROPER OPERATION Settings Recommended Default RON (RELAY ON SET POINT) 725 ROF (RELAY OFF SET POINT) 700 DSP (DISPLAY C CT CONFIGURATION) UNI (UNITS SELECTION) US US COL (CO2 LOW OUTPUT RANGE) COH (CO2 HIGH OUTPUT RANGE) TOL (TEMP. LOW OUTPUT RANGE) TOH (TEMP. HIGH OUTPUT RANGE) BAR (BAROMETRIC PRESSURE) 700 0 1500 2000 Not Used Not Used See Instructions with Controller For High Altitude Installations CAL (CALIBRATION) Used for Field Calibration MIS-4025 C Manual Page 2100-757 11 of 17 12 of 17 Page Manual 2100-757 Fresh Air CFM Fresh Air CFM Fresh Air CFM 2100-757 13 of 17 Manual Page Fresh Air CFM Fresh Air CFM Fresh Air CFM 14 of 17 Page Manual 2100-757 Fresh Air CFM Fresh Air CFM Fresh Air CFM FIGURE 8 Thermostat Wiring Diagram SC SC SC Completestat Model #CS9B-THOA or Model #CS9BE-THOA 24V COM G Y1 Y2 O/B W2 W1/E L A D GND Thermostat Bard #8403-082 OR #8403-084 564 32 8 17 1 7 7 5 3 2 Thermostat Bard #8403-060 R C G Y1 Y2 O/B W2 W1/E L A YO/D 4 5 3 2 Unit Low Voltage R RT C G Y1 Y2 B/W1 W2 W3 L A D 1 2 3 4 5 6 Term. Strip Optional CO2 Controller Bard Part #8403-096 1 24VAC 2 3 CO2 OUT 4 TEMP-OUT 5 6 6245 13 1 6 BLUE ORANGE BROWN/WHITE GRAY CRVS BLACK/WHITE RED/WHITE 9-PIN MOLEX 9-PIN MOLEX 1 Factory installed jumper. Remove jumper and connect to N.C fire alarm circuit if emergency shutdown required. 6 Remove jumper if using balanced climaPteLUoGp-tiFoEnM.ARLEefer to unit manual foPr LUG - MALE balanced climate details. 2 Wire required for dehumidification models only. 7 For vent operation thermostat must be configured for programmable, events 3 Do not connect "A" from thermostat if optional CO2 controller is used per day must be 2 business, and fan must be set to programmed fan. The blower and vent will operate during the occupied period. 4 0-10 VDC modulating C02 control signal for modulating ventilation control (optional - see vent instruction manuals) 5 This wire is only required if using balanced climate option. Refer to unit manual for balanced climate details. MIS-4343 A Manual Page 2100-757 15 of 17 FIGURE 9 Thermostat Wiring Diagram 8 T4 Pro 8403-095 R and 8403-089 T6 Pro 8403-090 or 8403-092 R Rc C 2 Rc C 2 GY GY W AUX E Y2 W AUX E 3 U Units With Dehumidification 8403-038 Mechanical Humidistat 7 OR 6 5 3 4 8403-047 Electronic Humidistat 6 Unit Low Voltage R RT C G Y1 Y2 B/W1 W2 W3 L A D 1 2 3 4 5 6 Term. Strip Optional CO2 Controller Bard Part #8403-096 1 24VAC 2 3 CO2 OUT 4 TEMP-OUT 5 6 6 24513 1 5 4 BLUE BLACK/WHITE ORANGE BROWN/WHITE GRAY CRVS RED/WHITE 9-PIN MOLEX 9-PIN MOLEX PLUG - FEMALE PLUG - MALE 1 Factory installed jumper. Remove jumper and connect to N.C fire alarm circuit if emergency shutdown required. 5 Jumper is required with single stage cooling thermostats. If using a two stage cooling thermostat the jumper can be removed for Balanced Climate operation. Refer to unit manual for Balanced Climate details. 2 Position slider tab up for single transformer systems. No jumper is required 3 Move U slider to the up position. Connect wire to lower U 6 0-10 VDC Modulating CO2 control signal for modulating ventilation control - See vent installation manual. terminal for vent operation. (Only applies to 8403-090) 7 Jumper needs added when using 8403-047 humidistat 4 For vent operation, add jumper if optional CO2 controller is not used. Vent will open when G blower signal is energized. See Important Note at bottom of page to avoid latching blower on. MIS-4345 A IMPORTANT NOTE An additional wire change is required if jumper 4 is used which connects "A" to "G" (shown in Figure 9). The brown/white wire on the blower interlock relay (located on the vent control plate) needs to be moved from the "common" terminal to the "normally closed" terminal. If this change is not made, the relay will latch on once the "A" signal is received and the blower will not turn off. Refer to Figure 10 to see the vent wiring diagram with this change called out. Manual 2100-757 Page 16 of 17 FIGURE 10 CRVS Wiring Diagram CRV-CONTROL BOARD 40 BLACK RED 90 60 30 0 BROWN/WHITE BROWN/WHITE RED/WHITE 1 Damper Motor 43 COM 24V 44 WHITE CONTROL FDBK BROWN *UNUSEDTAPE OFF* BLACK/WHITE Relay 39 BLUE BROWN/WHITE BLACK/WHITE RED/WHITE ORANGE GRAY 2 BROWN/WHITE BLACK/WHITE ORANGE GRAY 9-PIN MOLEX 9-PIN MOLEX PLUG - MALE 1 PLUG - FEMALE 28 45 1 Optional field jumper wire for constant ventilation with blower operation if occupied signal or CO2 demand or not used 2 Move Brown/White wire landing from COM to NC if 1 jumper is used from A to G. 4056-266 B NC NO COM 4 2 1 3 56 4 G R A B/W1 C CONTROL PANNEL Manual Page 2100-757 17 of 17