lodging hvac and refrigeration. goals guest comfort energy saving extend equipment life reduce...
TRANSCRIPT
![Page 1: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/1.jpg)
Lodging HVAC and Refrigeration
![Page 2: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/2.jpg)
Goals
• Guest comfort
• Energy saving
• Extend equipment life
• Reduce maintenance
• Reduce service calls
![Page 3: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/3.jpg)
What we’ll talk about
• The purpose of HVAC
• A/C fundamentals
• Basic HVAC controls
• HVAC troubleshooting
• HVAC system adjustments
• Guest room PTAC
![Page 4: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/4.jpg)
What we’ll talk about
• Refrigeration
Walk-in coolers and freezers
Under counter reach-ins
Display coolers
Guest room refrigeratorsIce maker fundamentals
Ice maker troubleshooting
![Page 5: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/5.jpg)
Typical Hotel Electricity Usage
49%
20%
9%
11%
11%
HVAC Room
HVAC Common
Lights Common
Lights Room
Misc.
Source: Florida Power
![Page 6: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/6.jpg)
Comfort
• Design airflow
• Space air distribution
• Outside air proportion
![Page 7: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/7.jpg)
Indoor Air Quality(IAQ)
• Indoor air pollution• Material outgassing• Particulates
• Ventilation• Infiltration, natural, and mechanical• Fresh air proportion required by code.
![Page 8: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/8.jpg)
HVAC Safety
• Loose hair, jewelry, wristbands, clothing
• Situational awareness
• Disconnect OFF
• Lock-out Tag-out
• Safety glasses
• Right tool for the job
![Page 9: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/9.jpg)
VOM Basics
Alternating current (AC)
Direct current (DC)
Continuity
![Page 10: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/10.jpg)
VOM Basics
Measuring voltage – Select type of power and rangeIf unsure select highest rangeMeasure voltage to ground
Checking fuses – Select Continuity (diode symbol)Place probes at each end of the fuseIf the fuse is good, then tone and reading 0
![Page 11: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/11.jpg)
A/C Fundamentals
![Page 12: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/12.jpg)
A/C FundamentalsStraight Cooling
![Page 13: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/13.jpg)
A/C FundamentalsHeat Pump
![Page 14: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/14.jpg)
Operation
• Cooling
Liquid line should be warm
Supply air should be about 15F lower than return air
Condenser discharge air should be warm
![Page 15: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/15.jpg)
Operation
• Heating (heat pump)
Suction line should be warm
Supply air temp should be 100F – 115F
Condenser discharge air should be cold
![Page 16: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/16.jpg)
Controls
![Page 17: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/17.jpg)
Controls Thermostat Wiring (Straight Cool)
![Page 18: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/18.jpg)
Controls Thermostat Wiring (Heat Pump)
![Page 19: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/19.jpg)
ControlsStraight Cooling
Red Thermostat, Air Handler, Condenser
Yellow Thermostat, Condenser
White Thermostat, Air Handler
Green Thermostat, Air Handler
![Page 20: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/20.jpg)
ControlsHeat Pump
Red Thermostat, Air Handler, Condenser
Yellow Thermostat, Condenser
White Thermostat, Air Handler, Condenser
Green Thermostat, Air Handler
Orange Thermostat, Condenser
Black Thermostat, Air Handler, Condenser
![Page 21: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/21.jpg)
Problems
• A/C not working (Not running)
Power
Fuses at disconnect
24VAC to control board
Control board fuse
24VAC to thermostat
Power at thermostat terminals
![Page 22: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/22.jpg)
Problems
24VAC at thermostat terminals
R to C
Y to C in cooling
W to C in heating
G to C in fan mode
If no C terminal read between R and appropriate terminal (Y, W, G). If there is power at the terminal there will be no reading.
![Page 23: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/23.jpg)
Problems
• A/C not working (running)
Airflow temperature
Filters
Coils
Condenser operation
![Page 24: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/24.jpg)
Problems
• Condenser troubleshooting
Power
Low voltage terminals
Discharge air temperature
Liquid line temperature (cooling)
![Page 25: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/25.jpg)
Problems
• Space too hot/cold (A/C working)
Check for airflow
Filters
Dampers
Controls
![Page 26: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/26.jpg)
Problems
• “Smudging” – Dirty filters Dirty coil Particle entrainment
• Squealing
On start-up - Belts slipping
While operating – Belts too tight
![Page 27: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/27.jpg)
Problems
• Evaporator icing
Low airflow – Dirty filters
Dirty coil
Low refrigerant charge
• Condenser icingDirty coil
Low refrigerant charge
![Page 28: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/28.jpg)
Revisiting the HVAC Systems
• Outside air
• Diffuser vanes
• Balancing dampers
• Fire dampers
• Controls
• Air handling equipment
![Page 29: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/29.jpg)
Outside Air
![Page 30: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/30.jpg)
Outside Air
• Ventilation air
• Required by code
• ASHRAE 62.1-2007
• Requirements vary by occupancy
• Amount for each system found in the balancing report.
![Page 31: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/31.jpg)
Outside Air
• Direct measurement• Temperature method• Must be 15F – 20F difference between outside air and
return air temps.
• Formula: (MA – RA)/(OA – RA)
Where: MA = Mixed air temp
OA = Outside air temp
RA = Return air temp
![Page 32: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/32.jpg)
Outside Air
Temperature method in action
Conditions: Outside air temp: 30FReturn air temp: 70FMixed air temp: 64F
Formula: (64 – 70)/(30 – 70) = 0.15
or 15% outside air.
![Page 33: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/33.jpg)
Diffuser Vanes
• Control diffusion and mixing in the space.
• Improper adjustment can lead to stagnant zones and drafty areas in the space.
• Usually set vanes at 45 degree angle from the center on sidewall diffusers.
![Page 34: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/34.jpg)
Balancing Dampers
• Located in ductwork prior to grilles.
• Usually located immediately prior to grille or at ductwork branch.
• If little to no flow at grille:Verify that damper is open
Ensure that damper handle position corresponds to damper position
![Page 35: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/35.jpg)
Fire Dampers
• Located in ductwork at fire-rated partitions.
• If there is no airflow to a space, check the fire dampers.
• Visual inspection through access doors in ductwork.
![Page 36: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/36.jpg)
Controls
• Ensure that the thermostat is level.
• Electronic thermostats programmed correctly.
![Page 37: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/37.jpg)
Air Handling Equipment
• Change filters every monthOrient filters correctlyMore often in dirty environments (laundry)Pre-filters in dirty environments
• Clean coils annually
• Keep fans cleanExhaust fans
![Page 38: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/38.jpg)
Air Handling Equipment
• Make sure that belts are tight and alignedRecommended ½” deflection
Pulleys should be in alignment
Grip-notch belts may solve slipping problems
• Ensure that drain lines are clear
• Drain pans slanted toward drain line
• Install float switchesWired between transformer and control board
![Page 39: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/39.jpg)
PTAC
• Package Terminal Air Conditioner
PowerLine fuse – 15A buss fuse24VAC to control boardControl board trouble codePower at control board terminals3A buss fuseNo power from board – replaceCompressor makes ‘chugging’ noise –
dying
![Page 40: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/40.jpg)
Property Refrigeration
• Walk-in cooler and freezer• Under-counter reach-in• Display coolers
Not running - Power
Fuses
Running - Coils
Discharge air temperature
Liquid line temperature
![Page 41: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/41.jpg)
Property Refrigeration
Guest room refrigerators• Power
• Coil
• Loaded
• Defrost
![Page 42: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/42.jpg)
Ice Maker
![Page 43: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/43.jpg)
Ice MakerFreeze Cycle
![Page 44: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/44.jpg)
Ice MakerHarvest Cycle
![Page 45: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/45.jpg)
Ice MakerTroubleshooting
• Download service manual from manufacturer
• Ice maker and bin may have different model numbers.
• Sequence of operations
• Trouble codes
• Troubleshooting help
![Page 46: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/46.jpg)
Ice MakerTroubleshooting
• Leaks
Drain line intact
Over floor drain
Debris in ice bin
Water line
![Page 47: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/47.jpg)
Ice MakerTroubleshooting
• Little or no ice
Clean condenser coil
Float switch
Ice curtain stuck
Water line obstruction
![Page 48: Lodging HVAC and Refrigeration. Goals Guest comfort Energy saving Extend equipment life Reduce maintenance Reduce service calls](https://reader035.vdocuments.net/reader035/viewer/2022081516/56649c7f5503460f94935ce5/html5/thumbnails/48.jpg)
Wrapping Up
• Improve guest experience
• Save energy
• Extend equipment life
• Reduce maintenance
• Reduce service calls
• Questions?