How to Draw Mechanical Equipment Plan
Chapter #4 – HVAC Mechanical Drawings
The mechanical drawings we volition be dealing with are specifically related to the HVAC industry. But like the other trades, the mechanical drawings have a specific purpose to their layout, so as to communicate the requirements of the project.
Typical drawings found in the HVAC Mechanical ready of drawings could include some or all of the following;
- Fable
- Abbreviations and symbols
- Equipment Schedule
- Full general Notes
- Specifications
- Zoning programme
- Demo
- Floor Program
- Elevations
- Department Views
- Details
- Schematics
- P & ID Drawings
- Control Diagrams
HVAC Mechanical Equipment Schedule
The HVAC equipment is shown on the Mechanical Equipment Schedule drawings. Here you will observe the HVAC equipment such as Air Conditioners, Air Handlers, Fan Roll 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 ain controller or thermostat. You tin can encounter that the floor programme is separated with dashed lines indicating which areas or rooms share the same HVAC zone.
There are 20 zones on this zone map indicated as 4-1 through 4-20. These twenty HVAC zones could be served from ane air treatment unit. Each of the xx zones can be served by a VAV (Variable Air Book) final, that will vary the volume of air to the space based on the temperature of the room and the thermostat setting.
HVAC Floor Programme
The floor plan is a view from above, every bit if you were floating to a higher place the space.
This is where the sheet metallic ductwork and HVAC Piping will be shown for each floor and area of the building. Y'all might discover that the HVAC Sheet Metallic and the HVAC Piping are shown on separate drawings to permit for clarity and avoid having drawings that are congested and hard to read.
In addition to the floor plans for each floor in the building you volition as well take a Roof Programme that shows that portion of the HVAC system that is installed on the roof. Also, located on the plan view is a North arrow to provide edifice orientation (run across plan view beneath for North arrow).
HVAC Particular Drawings
This drawing shows various HVAC details such as how equipment is supported, connected or provided with accessories.
HVAC Controls Drawing
Virtually commercial HVAC systems provide some aspect of controls automation, except for the most bones system that may only accept stand-lonely thermostats. Control system vary in their sophistication based on the owners need to monitor the system and the size of the HVAC system. Large primal plants volition oft take some class of BAS (building automation system) that optimizes the energy usage and schedule of the system.
Plumbing Drawings
You may demand to check the plumbing drawings to ostend if sure scope has been shown on those drawings. Engineers will ofttimes put the condensate piping from air conditioners on the plumbing drawings, or the gas pipage for a Gas/Electric HVAC unit.
Since you are doing the Sheet Metal at that place might not exist much if anything of your scope shown on the plumbing drawings except heater or boiler flues, simply since y'all work for an HVAC company, information technology still falls under your company's obligation to decide scope.
Equally shown in the higher up dissever prototype of the plumbing and HVAC drawings of the aforementioned area, the plumbing drawings have the gas piping that feeds the Gas Furnaces that are office of the HVAC telescopic of work. It's important to clarify in your scope letter that you have excluded gas piping.
Structural Drawings
Looking at the structural drawings volition sometimes provide yous with information on supports for the mechanical equipment, ducts or pipe. You lot can also determine how big the beams are and if at that place is enough room to possibly convert some of the more expensive rectangular ductwork into round duct.
Below is a small department of a structural drawings showing a large commercial buildings back up beams. Just like other trades, the structural engineer uses means and methods to communicate information near the supports. The width and weight per foot of the beams are shown circled in red. The designation "W21 ten 44", ways that the beam 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.
Demolition Drawings
When bidding on renovation projects there is a good chance that the existing HVAC system and ductwork will need to be removed or reworked. The engineer volition provide a sabotage cartoon identifying which systems are to be removed or relocated. Typical annihilation with a hash mark through it will point an item to exist removed, whether it's a slice of equipment or a section of ductwork.
Drawing Revisions
When changes are made to drawings that have already been issued for behest, the engineers volition issue an addendum prepare of drawings for any updated changes made. These addendums usually cloud the areas on the drawings that take changed equally indicated in the below image. In the image below the addendum is indicated equally addendum #1 (see red circumvolve around annex symbol).
Y'all would demand to compare this addendum fix to the original set of drawings to identify any changes that were made to the drawings. If you didn't begin your takeoff or gauge on the previous ready, then starting with this fix of drawings would include the latest changes.
Several things to consider when working with an addendum ready. Get-go does the addendum set include a full set? Sometimes the engineer volition only issue the drawings that have changes on them. This means that the addendum set may not be a full set up. Check the list of drawings on the encompass page or on the Architectural set. Be sure to identify all the drawings that you lot are bidding in your proposal.
Another thing to exist aware of is that the engineers don't always cloud the areas that have inverse. This means that you will need to review the complete set for any changes that were fabricated past the engineer but not conspicuously identified on the addendum set.
The drawing above also shows the equipment tags outlined by the blue squares. The starting time one is "RTU-i.1", which stands for Rooftop Unit of measurement, but as can be seen in the cartoon, this units is on the ground level. The next one is for "EF-1.3", which is an Exhaust Fan.
Specifications on Drawings
Some engineers prefer to put their specifications on the drawings instead of issuing a volume of specifications. Below is an instance where the engineer put all of the specifications on the front folio (M101).
At present click the link below for Chapter #5 "Understanding HVAC Symbols" to become an overview of the road signs on the drawings that provide information in pictographs.
- Affiliate #one – General Layout of Drawings
- Affiliate #2 – Architectural Drawings
- Chapter #iii – Plan, Pinnacle, Section Views and Details
- Chapter #4 – HVAC Mechanical Drawings
- Chapter #5 – Agreement HVAC Symbols
- Chapter #vi – Drawing Scales (How to Read Scales including Metric Scales)
- Chapter #7 – Canvas Metal Shop Drawings
Source: https://mepacademy.com/hvac-mechanical-drawings/
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