How Do You Draw Mechnical Plans
Affiliate #iv – HVAC Mechanical Drawings
The mechanical drawings we will exist dealing with are specifically related to the HVAC industry. Merely like the other trades, the mechanical drawings have a specific purpose to their layout, so equally to communicate the requirements of the project.
Typical drawings establish in the HVAC Mechanical prepare of drawings could include some or all of the following;
- Legend
- Abbreviations and symbols
- Equipment Schedule
- General Notes
- Specifications
- Zoning programme
- Demo
- Floor Plan
- Elevations
- Department Views
- Details
- Schematics
- P & ID Drawings
- Command Diagrams
HVAC Mechanical Equipment Schedule
The HVAC equipment is shown on the Mechanical Equipment Schedule drawings. Hither you will find the HVAC equipment such as Air Conditioners, Air Handlers, Fan Coil Units, Fans, Chillers, Cooling Towers, Pumps, Air Distribution, Expansion Tanks, Boilers, VFD'southward (Variable Frequency Drives), Condensers and various other components of the HVAC organisation.
Zoning Map
This drawing shows how the HVAC zones are divided up. Each zone typically has its own controller or thermostat. You tin see that the flooring plan is separated with dashed lines indicating which areas or rooms share the same HVAC zone.
In that location are twenty zones on this zone map indicated every bit 4-1 through 4-20. These twenty HVAC zones could exist served from i air handling unit of measurement. Each of the 20 zones can exist served past a VAV (Variable Air Volume) final, that will vary the book of air to the space based on the temperature of the room and the thermostat setting.
HVAC Floor Plan
The floor plan is a view from in a higher place, as if yous were floating above the space.
This is where the sheet metal ductwork and HVAC Piping volition exist shown for each floor and area of the building. You might observe that the HVAC Canvas Metal and the HVAC Piping are shown on carve up drawings to allow for clarity and avoid having drawings that are congested and hard to read.
In add-on to the flooring plans for each floor in the building you will likewise accept a Roof Programme that shows that portion of the HVAC system that is installed on the roof. Also, located on the program view is a Due north pointer to provide edifice orientation (encounter program view below for North arrow).
HVAC Detail Drawings
This drawing shows various HVAC details such every bit how equipment is supported, connected or provided with accessories.
HVAC Controls Drawing
Most commercial HVAC systems provide some aspect of controls automation, except for the most bones system that may just have stand-lone thermostats. Command system vary in their composure based on the owners need to monitor the organisation and the size of the HVAC system. Large central plants will frequently have some form of BAS (building automation organization) that optimizes the energy usage and schedule of the arrangement.
Plumbing Drawings
You may need to bank check the plumbing drawings to confirm if certain scope has been shown on those drawings. Engineers will frequently put the condensate pipe from air conditioners on the plumbing drawings, or the gas pipe for a Gas/Electrical HVAC unit of measurement.
Since you lot are doing the Canvass Metallic there might non be much if annihilation of your telescopic shown on the plumbing drawings except heater or banality flues, but since you work for an HVAC company, it notwithstanding falls under your visitor's obligation to make up one's mind scope.
As shown in the above split paradigm of the plumbing and HVAC drawings of the aforementioned surface area, the plumbing drawings take the gas piping that feeds the Gas Furnaces that are part of the HVAC scope of work. It's important to clarify in your scope alphabetic character that you take excluded gas piping.
Structural Drawings
Looking at the structural drawings will sometimes provide you with information on supports for the mechanical equipment, ducts or piping. You tin too determine how big the beams are and if there is plenty room to possibly convert some of the more expensive rectangular ductwork into circular duct.
Below is a small section of a structural drawings showing a large commercial buildings support beams. Only similar other trades, the structural engineer uses means and methods to communicate information most the supports. The width and weight per foot of the beams are shown circled in red. The designation "W21 x 44", means that the axle is 21 inches in depth and weights 44 pounds per foot. The "W24 x 55" is 24 inches in depth and weights 55 pounds per foot.
Sabotage Drawings
When bidding on renovation projects there is a good take chances that the existing HVAC organisation and ductwork will need to be removed or reworked. The engineer will provide a sabotage drawing identifying which systems are to be removed or relocated. Typical annihilation with a hash marker through it will point an item to be removed, whether it's a piece of equipment or a department of ductwork.
Cartoon Revisions
When changes are made to drawings that take already been issued for behest, the engineers will issue an addendum ready of drawings for any updated changes fabricated. These addendums usually cloud the areas on the drawings that have changed every bit indicated in the beneath image. In the image beneath the addendum is indicated as addendum #1 (encounter red circumvolve around addendum symbol).
You lot would need to compare this annex set to the original ready of drawings to identify whatsoever changes that were made to the drawings. If you didn't begin your takeoff or estimate on the previous set up, so starting with this set of drawings would include the latest changes.
Several things to consider when working with an addendum set. First does the addendum set include a total prepare? Sometimes the engineer will only issue the drawings that have changes on them. This means that the addendum fix may not be a total prepare. Check the list of drawings on the cover page or on the Architectural set. Be sure to place all the drawings that you lot are bidding in your proposal.
Some other thing to be aware of is that the engineers don't e'er deject the areas that have changed. This means that you will need to review the consummate set for any changes that were made past the engineer but not clearly identified on the addendum set.
The drawing above also shows the equipment tags outlined by the blue squares. The first i is "RTU-1.1", which stands for Rooftop Unit, but as can be seen in the drawing, this units is on the ground level. The next one is for "EF-1.three", which is an Exhaust Fan.
Specifications on Drawings
Some engineers prefer to put their specifications on the drawings instead of issuing a book of specifications. Beneath is an example where the engineer put all of the specifications on the forepart folio (M101).
Now click the link beneath for Chapter #5 "Agreement HVAC Symbols" to get an overview of the road signs on the drawings that provide information in pictographs.
- Chapter #1 – General Layout of Drawings
- Affiliate #two – Architectural Drawings
- Chapter #iii – Plan, Pinnacle, Section Views and Details
- Chapter #4 – HVAC Mechanical Drawings
- Chapter #v – Understanding HVAC Symbols
- Chapter #vi – Drawing Scales (How to Read Scales including Metric Scales)
- Affiliate #7 – Sheet Metal Shop Drawings
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Source: https://mepacademy.com/hvac-mechanical-drawings/
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