ADDENDUM NO. 4. Make the following amendments and additions to the Drawings and Specifications, and include this cost in the Contract Price.

Transcription

1 Lake Huron Primary Water Supply System c/o The City of London Regional Water Supply Division Tender T13-96 HVAC and Dehumidification Project (No. LH 1203) Chorley + Bisset Ltd. Consulting Engineers London, Ontario 11 October 2013 Page 1 of 6 ADDENDUM NO. 4 Make the following amendments and additions to the Drawings and Specifications, and include this cost in the Contract Price. 1. GENERAL INFORMATION AND RESPONSES TO QUESTIONS Q1. For the new MCC s F3, H3, & MSE, the specification does not indicate the enclosure rating required. Please advise. Please also advise the required short circuit rating of the devices as the specification only states the bus withstand rating. A1. See Specification Section Q2. Please advise the required enclosure rating of all the new panels. A2. See Specification Section , , Q3. VFD Specification section art states that the VFD enclosures must be Nema 4x. However art states that a Nema 1 enclosure is acceptable for areas where EMT is permitted. None of the drawings and documents clearly indicate the areas where EMT is permitted. Please advise which enclosed VFD s are in areas where EMT is permitted so that I may offer Nema 1 enclosures. This is important as Nema 4x enclosures will require air conditioners, and this will add significant cost. A3. See Specification Section Q4. Disconnect Specification section art states that the disconnects must be Nema 4x. It also states that a Nema 1 enclosure is acceptable for areas where EMT is permitted. None of the drawings and documents clearly indicate the areas where EMT is permitted. Please advise which disconnects are in areas where EMT is permitted so that I may offer Nema 1 enclosures. A4. See Specification Section Q5. Loose Starter Specification section art states that the starters must be Nema 4x. It also states that a Nema 1 enclosure is acceptable for areas where EMT is permitted. None of the drawings and documents clearly indicate the areas where EMT is permitted. Please advise which starters are in areas where EMT is permitted so that I may offer Nema 1 enclosures

2 A5. See Specification Section Q6. Form of Tender Page 18 Item 1.0 Provisional Items 2. Bonding ask for a price per $1, Does that mean that we are to NOT include the costs for any bonding in our pricing or is this for additional work. A6. The item is for bonding of the additional work. Q7. Section page 3, article 1.2 Work Included, Item Can the control panels communicate with the plant SCADA via a standard communication protocol such as BACnetIP, BACnet MSTP or MODbus instead of dry contacts? A7. Bid Price to show control arrangement as shown on drawings and as specified. Q8. Can free space in existing cable trays be used to run new network cabling, etc? A8. Yes, however network/controls cabling, etc are to run only in existing network cable trays and not in existing 600V cable trays. 2. FRONT END TENDER DOCUMENTS 1. DATA SHEET FOR TENDERERS 1. Revise Tender Closing Date to: 2:00 p.m. - Wednesday, October 30, Revise Commencement Date to: December TENDER T13-96 SECTION (25 Pages) 1. Detailed breakdown of prices (Part 1, Part 2, Part 3, Part 4) are permitted to be submitted by 24 hours after Tender Close. Subcontractor s Names and Manufacturer s/supplier s Names MUST be submitted at Tender Close. Addresses only for Subcontractor s and Supplier s will be permitted to be submitted 24 hours after Tender Close. 2. Revise all references to Tender Closing Date to: 2:00 p.m. - Wednesday, October 30, In 5-3, Paragraph a) (Page 6 of 25), revise question deadline date to: Wednesday, October 23, 2013 at 2:00 p.m. 4. In 6-0, Part 2 Itemized Prices Table (Page 16 of 25), revise first sentence to read: Herewith are Itemized Prices (including overhead and profit, all subtrades, electrical, structural, architectural but excluding controls) for the work listed hereunder. 5. In 6-0, Part 2 Itemized Prices Tables (Pages 16 and 17), revise Dehumidification Unit Tags from DXF-1 and DXF-2 to XDF-1 and XDF-2, respectively

3 3. MECHANICAL SPECIFICATIONS 1. SECTION NOISE CONTROL, VIBRATION ISOLATION AND SEISMIC SUPPORTS 1. Add to 2.6: Mason Industries 2. SECTION LIQUID HEAT TRANSFER 1. Add to : Bell and Gossett 2. Add to : Bell and Gossett 3. Add Clause: The following manufacturers of the above equipment will be considered equal, subject to the requirements of Clause Material and Equipment:: Bell and Gossett 4. In , Revise last sentence to read: Base capacities on design conditions shown on Schedule on Drawings. 5. In , Delete last sentence. 3. SECTION AIR DISTIBUTION 1. Add to 2.4.6: Alumavent 2. Add to , Inline fans: PennBarry 3. Add to : Ventex 4. Add to : Ventex 5. Add to : VanPacker 6. Delete Article 2.19, Electric Duct Heaters. 7. Add Clause: 2.21 ENERGY RECOVER VENTILATORS Use Mitsubishi Lossnay energy recovery ventilator with exhaust only defrost mode Unit to utilize a static energy recovery core to preheat and humidify supply air using energy recovered from exhaust air during the heating season. At 0EC (32EF), 73% sensible recovery efficiency is required. Unit to precool and dehumidify supply air by rejecting energy to the exhaust air during the cooling season. At 35EC (95EF), 50% total recovery efficiency is required

4 Unit to include separate supply and exhaust fans with motorized dampers, prefilters and energy recovery core in a heavy gauge galvanized steel box with hinged access side. Use the configuration shown on the Drawings Unit to be integrated with VRF System. Control of ERV is through BACNet interface supplied with VRF system Recirculating defrost control is not acceptable. Provide custom controls that will operate exhaust fan only and turn off supply fan for defrost control The following manufacturers of the above equipment will be considered as an equal, subject to requirements of Clause Material and Equipment : Daikin 4. MECHANICAL DRAWINGS 1. Drawing M In the Heating Unit Schedule, for Heater A-1, delete the following sentence in the remarks column: Pedestal free standing wall fin. 2. Drawing M On Detail G: Building 1D - Sedimentation piping Plan Above El m, revise coil tag from SWC 1A to SWC 2A. 3. Drawing M On Section Detail A, revise coil tag from SWC 1C to SWC 2C. 2. On Section Detail D, revise coil tag from SWC 1A to SWC 2A. 5. ELECTRICAL SPECIFICATIONS 1. SECTION LIGHTING CONTROL SYSTEMS 1. Delete "Clause 3.2 Additional System Components" in its entirety. 2. SECTION ELECTRIC HEATING 1. Revise to be: "Heaters to be designed for use on 208, 347, or 600V single or three phase operation as shown on drawings. Refer to Electric Heater Schedule on drawings for voltages and types." 2. Clause 2.2.6: Add Thermolec as an equal

5 6. ELECTRICAL DRAWINGS 1. Drawing E Revise mounting height of "Switch-Single Pole-Pilot Light" to be 1195 mm A.F.F. 2. Add Cooper and Lithonia as equals for Type W. 3. Add ConTech Lighting as equal for Type T. 2. Drawing E Revise FN-13 to be served by 15A-1P breaker and 6#12 in 21 mm conduit. 2. Revise HFN-28 and HFN-29 to be controlled by VFDs. 3. Revise HFN-34 to be served by 15A-1P breaker and 6#12 in 21 mm conduit. 4. Revise LFN-7 to be controlled by a VFD. 5. Add "General Notes: 1. Mount starter on wall nearest mechanical equipment unless otherwise noted, shown or specified." 3. Drawing E Building 1A - High Lift Pumping Station Plan Above EL m 1. Provide 15A-1P breaker in Panel 'HX' to serve Relay Panel 'RP-1A1'. 2. HFN-28 and HFN-29 VFDs to be located along East Wall of Electrical Room. 4. Drawing E Provide 15A-1P breaker in Panel 'STN' to serve Relay Panel 'RP-1C1' 5. Drawing E Provide 15A-1P breaker in Panel 'STN' to serve Relay Panel 'RP-1D1'. 6. Drawing E Building 3 - Chlorine Building Plan Above EL m 1. Revise "Relay Control Panel 'RP-CHL'" to be "Panel 'CHL' 2. Circuit Relay Panel 'RP-CHL1' from 15A-1P breaker in Panel 'LP-A'

6 2. Building 4 - Standby Generator 1. Revise Relay Panel 'RP-SG' and Div 15 Control Panel to be located along Gridline C and East of Gridline Provide 15A-1P breaker in Panel 'LP2' to serve Relay Panel 'RP-SG'. 7. Drawing E Revise location of LAHU-11 VFD to be on wall within Electrical Room. 2. Building 2 - Low Lift Pumping Station Plan Above EL m, Detail A 1. Provide 15A-1P breaker in Panel 'LX' to serve Relay Panel 'RP-L1'. 2. LFN-7 VFD to be located on wall within Electrical Room. 8. Drawing ED-9 1. Building 2 - Low Lift Pumping Station Plan Above EL m 1. Add the following Notes: 1. "Remove existing electric recessed cabinet heater, cabling and conduit back to source. Repair wall to match adjacent walls in space." 2. "Disconnect and remove existing unit heaters. Completely remove wiring, conduit and accessories back to source." 3. "Disconnect and make safe for removal by Mechanical Trades. Completely remove wiring, conduit and accessories back to source." END OF ADDENDUM NO