ERV Vertical Unit Ventilators Classroom Ventilators with Energy Recovery Installation, Operation and Maintenance Instructions Manual Capacity: 800 to 2,000 cfm Model: ERV1100w, ERV2000w with WSHP, Electric or Hydronic Heating ©2006 Venmar CES Inc.
Table of Contents Nomenclature.......................................................................................................................................................................3 Safety Considerations..........................................................................................................................................................5 Specifications..........................................................................................................................
Nomenclature ERV1100w Nomenclature (1,100 cfm nominal) 1 2 3 4 5 6 7 8 9 1. FROST CONTROL D – Recirc defrost1 E – Exhaust only2 V – VSD frost prevention3 N – Non-defrost 2. VOLTAGE/SPEED A – 120/1/60 – two-speed4 B – 208/120/1/60 – two-speed5 C – 230/120/1/60 – two-speed5 D – 208/3/60 – two-speed6 E – 230/3/60 – two-speed6 F – 460/3/60 – two-speed6 3.
ERV2000w Nomenclature (2,000 cfm nominal) 1 2 3 4 5 6 7 8 9 1. FROST CONTROL D – Recirc defrost1 E – Exhaust only2 V – VSD frost prevention3 N – Non-defrost 2. VOLTAGE/SPEED A – 120/1/60 – two-speed4 B – 208/120/1/60 – two-speed5 C – 230/120/1/30 – two-speed5 D – 208/3/60 – two-speed E – 230/3/60 – two-speed F – 460/3/60 – two-speed 3. HEATING E – Electric heat H – Hot water P – Proportional electric heat6 R – Hot gas reheat, on/off7/8 S – Hot gas reheat, modulating7/8 X – No heat 4.
Safety Considerations Warning, Caution and Important notes appear throughout this manual in specific and appropriate locations to alert Installing Contractors and maintenance or service personnel of potential safety hazards, possible equipment damage or to alert personnel of special procedures or instructions that must be followed as outlined below. ! WARNING Identifies an instruction which, if not followed, might cause serious personal injuries including possibility of death.
Installation Rough In The wallmount ventilator must be installed on a level base. Refer to Appendix A dimensions. Zero clearance is allowed between the bottom of the unit and any combustible material. Unit Installed without Top Plenum The supply air ducting must be connected to the supply collar and constructed so that there are no openings within 30” [762 mm] of the electric heating elements. Openings within 30” [762 mm] of the elements must be fitted with a permanent, non-removable protective screening.
Controls The wall units contain a stand alone controls package consisting of either a Direct Digital Controller (DDC) system or an optional no controls package for field installation and controls. The DDC system allows the units to operate in either a stand alone capacity or in conjunction with numerous units via a field provided networking system. Stand Alone Controls (DDC) The mainframe for the stand alone DDC system is the programmable DSC-T305 controller/keypad.
Balancing Once installed, the unit must operate with balanced ventilation. Balanced ventilation is achieved by obtaining equal rates of outdoor and exhaust airflow. Airflow may be adjusted by balancing dampers (supplied by Installer) within the ductwork. Outdoor air volumes can be adjusted by changing the maximum open position on the opposed blade outdoor air damper. Supply airflow can be adjusted on both low and high speed using the ECM motor cfm adjustment procedure in Appendix H.
Recirculation Control In ventilation mode, the outside air damper is open and the supply air is a mixture with a percentage of return air. In recirculation mode, the ventilation damper is closed and 100% of the supply air is recirculated air from the return plenum. Units equipped with recirculation control are built with a damper mechanism controlling air flow through the intake duct. Ventilation mode is activated by the DDC controller schedule.
Annual Maintenance ! WARNING Disconnect the main power switch to the unit before performing service or maintenance procedures. Interior of Unit The inside of the unit should be vacuumed or wiped clean annually with a soft cloth and mild cleaning solution. Check the drain fittings (if equipped) to ensure they are draining freely. Enthalpy Wheel No cleaning of the enthalpy wheel is required. It is selfcleaning due to the opposing airflows.
VCES-VUV-IOM-4B – ERV1100w & ERV2000w Exhaust air Outdoor air LEFT VIEW B A 3.735” [95] 9.180” [233] C 8.753” [222] Supply air FRONT VIEW 41.300” [1,049] Return air TOP VIEW 2.250” [57] 3.456” [88] 12.000” [305] 5.534” [141] 75.851” [1,927] RIGHT VIEW 2.989” [76] 15.964” [405] 11.000” [279] D Free cooling bypass 67.964” [1,726] WSHP water line supply WSHP water 5.254” [133] line return Power connection Control wire connection Hot water coil supply/return CW/Dx condensate drain 30.
Figure A2: ERV2000w unit dimensions VCES-VUV-IOM-4B – ERV1100w & ERV2000w 12 A D 3.645” [93] 16.125” [410] 75.747” [1,924] WSHP water line supply WSHP water 4.322” line return [110] 4.904” [125] 3.815” [97] B EA OA 12.000” [305] 7.500” [191] 18.646” [474] BACK VIEW 8.125” [206] 24.074” [611] Free cooling bypass 20.250” [514] TOP VIEW 2.250” [57] 12.250” 9.101” [311] [231] Outdoor air Exhaust air 2.502” [64] 3.934” [100] 11.000” [279] 34.350” [872] 25.899” [658] B A 32.
Appendix B: Plenum Dimensions 1.25” [32] 2.25” [57] 26.75” [679] Control wire access Ø 1” [25] Electrical access Ø 2” [51] 8.75” [222] 27.00” [686] 30.50” [775] 41.30” [1,049] 23.75” [603] 17.00” [432] 11.75” [298] 1.25” [32] 3.00” [76] TOP VIEW 5.25” [133] Ø 1” [25] x 4 electrical/piping access holes 2.63” [67] FRONT VIEW RIGHT VIEW Note: Dimensions in [ ] are millimeters. Figure B1: ERV1100w standard plenum dimensions 1.25” [32] 2.25” [57] 30.50” [775] 41.30” [1,049] 26.
48.00” [1,219] 26.70” [678] 30.50” [775] 26.94” [684] 11.28” [287] Control wire access Ø 1” [25] Electrical access Ø 2” [51] 3.00” [76] 5.25” [133] TOP VIEW 1.25” [32] 2.20” [56] 1.25” [32] 17.00” [432] 3.21” [82] 4.05” [103] 19.26” [489] FRONT VIEW Ø 1” [25] x 4 electrical/piping access holes RIGHT VIEW Note: Dimensions in [ ] are millimeters. Figure B4: ERV2000w standard plenum dimensions 26.70” [678] 48.00” [1,219] 26.94” [684] 30.50” [775] 17.
Appendix C: Airflow Performance Data ERV1100w on the right hand Y axis—Outside Air Percentage (% of Fully Open Supply Side Volume)—and run across to the Outside Air Curve (see #1 below). 50% equates to 42° open OA damper or 5.5 VDC for modulating damper actuator. 3. Find the new TA volume by running vertically from point #1 on the 42° open line to the Total Air Curve and then horizontally to the left hand Y axis (see #2 below). In this example, the TA is 95.5% of full open which is 95.5% x 900 = 860 cfm.
Table C1: ERV1100w Airflow Performance Data Fan Speed External Static Pressure (in. w.g.) 0.0 TA 0.1 OA TA 0.2 OA TA 0.3 OA TA 0.4 OA TA 0.5 OA TA 0.
ERV2000w Outdoor Airflow Adjustment If the desired outside airflow is less than the value shown in the ERV2000w airflow performance data table (see Table C2), the amount of airflow can be reduced by partially closing the outside air inlet damper. Please note that the total airflow will be affected when adjusting the outside air damper. To determine the amount that the outside air damper must be closed, divide the desired flow by the rated outside airflow from Table C2. Example • 4 ton WSHP at 0.
Table C2: ERV2000w Airflow Performance Data Chilled Water Cooling with Electric Post-heat Chilled Water Cooling Only Water Source Heat Pump or Dx Cooling with Electric Post-heat Water Source Heat Pump or Dx Cooling Electric Heat Only Chilled Water Cooling with Hot Water Post-heat Hot Water Heat Only Water Source Heat Pump or Dx Cooling with Hot Water Post-heat Water Source Heat Pump with Hot Gas Reheat Capacity 4 and 5 ton 3 and 3.5 ton Fan Speed External Static Pressure (in. w.g.) 0.0 TA 0.1 OA TA 0.
Appendix D: Electrical Data Table D1: ERV1100w Blower Motors Full Load Amperage (FLA) HP ¼ (exhaust) ½ (supply – no gas) ¾ (supply with gas) Voltage 120/1/60 4.80 5.80 8.00 208/1/60 2.20 3.40 8.00** 230/1/60 2.20 3.40 8.0** 208/3/60 2.20* 3.40* 230/3/60 2.20* 3.40* 460/3/60 1.10* 1.20* 208/3/60 2.20* 3.40* 5.80* 230/3/60 2.20* 3.40* 5.80* 460/3/60 1.10* 1.20* 2.90* 208/3/60 6.95 13.90 20.84 27.79 34.74 230/3/60 6.28 12.57 18.85 25.13 31.41 460/3/60 3.14 6.28 9.42 12.57 15.71 208/3/60 9.30 10.
Appendix E: Remote Occupant Interface The BacStat is connected to the unit using a four-conductor cable. Shielded cable should be used for the BacStat wiring and standard thermostat installation practices should be used. Avoid mounting the BacStat near any sources of heat or in places where airflow is restricted. The BacStat should be accessible to the occupant. CONTROL OUTPUTS HYDRONIC/STEAM VALVE + 24 VAC 2 − 24 VAC 3 W AUX. HEAT 4 Y AUX. COOL AUX.
Appendix F: DDC Keypad Reference Guide Unit Setup and Configuration Troubleshooting Quick Reference Guide Using the Keypad Controls Entering the Menu Mode Values are changed using the up and down arrow keys. To enter the menu mode, hold down the left and right arrow keys at the same time for a few seconds until the word ‘Pin’ appears on the display. Enter the ‘Pin’ number. At this point, the controller will enter the menu mode, displaying one of the three menus listed below.
Table F1: DDC Keypad Reference Guide Menu Manual Control Sub-menu Manual Mode Display – Man Mode Display – Ctrl Only one mode may Button ‘1’ on keypad be manually active at any time System Diagnostics Input Monitor Display – Diag Button ‘2’ on keypad System will continue to operate normally while in diagnostic mode System Configuration Display – Cfg Button ‘3’ on keypad Parameter Settings Active/inactive Off/stage 1/2/3/4 Off/stage 1/2/3 Off/stage 1/2/3/4 Off/stage 1/2/3 Value from sensor Value from
Appendix G: Start-up and Troubleshooting Before powering the unit, check the following: • • • • • • High voltage is correct and matches the nameplate. Fuses, breakers and wire sizes are correct. Low voltage wiring is completed. Piping is completed and water system has been cleaned and flushed. Isolation valves are open and loop water control valves or loop pumps are wired. Service/access panels are in place. Unit Start-up 1. Set control above cooling setpoint. 2.
Table G1: ERV1100w and ERV2000w Troubleshooting Problem Cause The fuse may be open or the circuit breaker may be tripped. Supply voltage may be too low. Control system may be faulty. Wires may be loose or broken. The low pressure switch may have been tripped. Compressor will not run. The high pressure switch may have been tripped. The compressor overload protection may be open. Solution Check electrical circuits and motor windings for shorts or grounds. Investigate for possible overloading.
Appendix H: ERV1100w and ERV2000w Start-up Report Date:_____________________________________________ Site Reference:_____________________________________ Job Number:_______________________________________ Unit Number:______________________________________ Unit Type:_________________________________________ Room Number:____________________________________ Installer:_ _________________________________________ Representative:_____________________________________ Service Technician:_____________________________
Appendix I: ECM Motor CFM Adjustment Procedure Step 1 Decrease CFM Using a DMM set to measure VDC, record all current values for each of the Flo points. Measurement is made between Flo Com and the respective Flo test point. Record these values under Factory Set. Refer to Figure I1 to locate test points. While measuring the Flo setting adjust the respective RP potientiometer counter-clockwise for that speed. A voltage decrease of 0.05 VDC will decrease the motor torque by one oz-ft.
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