Heating, Ventilating, Cooling, Mechanical Contractors Industry Terminology

Per ACCA Manual J, the sensible load comes to 48,000 BTU/hr.; We follow ACCA Quality Installation guidelines on all residential jobs.; Let’s cite ACCA Manual D for the duct sizing submittal.

A steam-driven absorption chiller will capture waste heat from the CHP.; Absorption works for our hospital because electric demand charges are high.; We’ll compare LiBr absorption vs. electric centrifugal in the LCCA.

Labs typically require 6–12 ACH by code and risk assessment.; Our energy model shows we can reduce ACH at night with setbacks.; To meet 62.1, the classroom needs 4 ACH of outdoor air.

The new AHU-3 has an energy recovery wheel and MERV 13 filters.; We’ll stage the coil replacement during the AHU outage window.; Trend logs show AHU static pressure can be reset to save energy.

We chose air-cooled condensers to avoid water treatment.; Noise screening is needed for the roof air-cooled banks.; At 95°F ambient, the air-cooled condenser limits chiller capacity.

Ventilation rates are per ASHRAE 62.1.; Our baseline energy model follows ASHRAE 90.1 Appendix G.; The setpoints align with ASHRAE 55 comfort criteria.

Let’s add a BAS alarm for high chilled-water delta-T.; The BAS trend shows the VAVs are hunting the setpoint.; We’ll integrate the boilers via BACnet to the BAS.

Run a Navisworks clash between duct and the steel.; We’ll export spool drawings directly from the BIM model.; The owner requested COBie data for FM from BIM.

This split system is rated at 36,000 BTU/hr.; The load calc adds 10,000 BTU/hr for lighting.; We’ll convert BTU/hr to kW for the energy model.

Upgrading the envelope cuts the HVAC tonnage.; Infiltration through the envelope is spiking heating loads.; Specify U-values and SHGCs that meet code for the envelope.

VRF lowers CAPEX versus a central plant on this project.; We’ll balance CAPEX and OPEX using NPV.; The owner approved CAPEX for two new chillers.

Rerouting the duct riser will require a change order.; Submit CO pricing for the added FCUs and controls.; The CO extends substantial completion by 10 days.

We’ll add a 500-ton centrifugal chiller to the plant.; Low delta-T is reducing chiller efficiency.; Specify VSD chillers with N+1 redundancy.

Cx functional tests begin next week.; The Cx agent requested more BAS trend data.; RCx saved 18% by fixing control sequences.

The screw compressor is short-cycling.; We’ll stage compressors based on load and kW/ton.; VFDs on compressors improve part-load efficiency.

Clean the condenser coils to restore capacity.; Tower setpoint affects the condenser approach.; Ambient temp limits air-cooled condenser performance.

This heat pump has a COP of 3.5 at 47°F.; Raising chilled water temp increases chiller COP.; We’ll compare COP curves at part load.

Upgrade the AHU to DDC with BACnet MSTP.; DDC alarms will alert us to high static pressure.; Tune the DDC loops to stop valve hunting.

Design-build lets us fast-track equipment procurement.; We’re proposing a design-build GMP with shared savings.; Design-build reduces coordination RFIs.

Lower the static setpoint to 1.2 in. w.c. during low load.; We’ll add a duct static sensor downstream of the AHU.; Static pressure reset saved 20% fan energy.

Enable the economizer below 55°F and low enthalpy.; Faulty dampers are defeating the economizer cycle.; Title 24 requires integrated economizers on these RTUs.

Add an ERV to precondition the OA for the AHU.; The enthalpy wheel boosts winter humidity.; ERV effectiveness improves our energy model.

The guestrooms use 4-pipe FCUs with DOAS ventilation.; Replace the FCU motors with ECMs.; Balance the FCUs after coil cleaning.

We’ll carry a 5% MEP contingency in the GMP.; Owner accepted a GMP with allowances for controls.; Shared savings incentivize VE under the GMP.

We’re phasing out R-410A due to high GWP.; Consider R-454B for lower GWP in new RTUs.; Specs cap refrigerant GWP per local regs.

Add a plate-and-frame HX for waterside economizer.; We’ll isolate glycol with a heat exchanger at the tower.; HX fouling raised approach temperatures.

The load calc shows 150 tons at peak.; We updated loads after the glazing change.; Diversified load profiles drive chiller sizing.

Our firm self-performs HVAC and plumbing.; The HVAC scope includes controls and TAB.; HVAC accounts for 40% of building energy.

We’re targeting better IAQ with MERV 13 filters.; CO₂ sensors will modulate ventilation for IAQ.; IAQ testing is part of the turnover package.

We can’t fabricate until the IFC set drops.; Coordinate spools against the IFC ceiling heights.; Redline the IFC drawings during field changes.

Set up a pull plan for the mechanical floor.; We’re using takt zones for duct install.; Lean prefabrication cut field labor by 25%.

Perform LOTO before opening the RTU panel.; LOTO points are listed in the JHA.; The crew completed LOTO training last month.

The kitchen hood requires a dedicated MAU.; Heat the MAU with indirect gas fired sections.; Balance the MAU to match exhaust flow.

The MEP coordination meeting is at 10 a.m.; MEP rough-in must finish before drywall.; We’re the MEP prime on this design-build.

Specs call for MERV 13 pre-occupancy.; Check fan static for the MERV upgrade.; We’ll stage MERV 8 prefilters and MERV 13 finals.

Variable-speed pumps win on NPV over 15 years.; We used a 6% discount rate in the NPV.; High-efficiency chillers have a positive NPV.

Deliver O&M manuals at substantial completion.; Add quarterly PM to the O&M plan for the boilers.; O&M staff want hands-on BAS training.

Retune the PID loop for discharge air temp.; Poor PID tuning is causing oscillation.; We’ll switch to PI only on this slow loop.

We’ll prefab the pump skid with VFDs and piping.; Ductwork is being prefabricated by zone.; Prefab cut our installed cost by 18%.

Plot the mixed-air state on the psych chart.; We need reheat to hit the psychrometric target.; Enthalpy control uses psychrometric comparisons.

TAB is part of our QA/QC plan.; QC rejected the weld due to lack of penetration.; Update the QA/QC checklist for coil installation.

Submit an RFI on the conflicting duct elevations.; The RFI response approved an alternate VAV box.; Track RFIs and impacts in the log.

Charge the system with R-454B per spec.; Local code now allows A2L refrigerants.; We’ll recover and weigh out the old refrigerant.

RCx revealed failed OA dampers.; LED and VFD retrofits qualified for rebates.; We’ll retrofit coils and add DDC to the AHUs.

Replace RTU-5 with a 20-ton high-efficiency model.; The curb adapter will fit the new RTU footprint.; Add an economizer section to each RTU.

Schedule TAB after controls are commissioned.; Final TAB shows all VAVs within 10%.; Hydronic TAB corrected low delta-T issues.

VE: swap to ECM fan arrays to save energy.; We proposed VE to downsize pumps after recalcs.; VE workshop identified four acceptable alternates.

Reset duct static based on VAV damper positions.; The VAV boxes need new reheat valves.; Convert CAV to VAV for energy savings.

Add VFDs to the CHW pumps for delta-P control.; The VFD tripped on overcurrent—check filters.; VFD turndown improves part-load efficiency.

VRF was selected for the office fit-out.; Mind the line length limits in the VRF design.; Heat-recovery VRF reduces reheat energy.