1. Lodging HVAC and Refrigeration

2. Goals Guest comfort Energy saving Extend equipment life
Reduce maintenance
Reduce service calls

3. What we’ll talk about The purpose of HVAC A/C fundamentals
Basic HVAC controls
HVAC troubleshooting
HVAC system adjustments
Guest room PTAC

4. What we’ll talk about Refrigeration Walk-in coolers and freezers
Under counter reach-ins
Display coolers
Guest room refrigerators Ice maker fundamentals
Ice maker troubleshooting

5. Source: Florida Power

6. Comfort
Design airflow
Space air distribution
Outside air proportion

7. Indoor Air Quality (IAQ)
Indoor air pollution
Material outgassing
Particulates
Ventilation
Infiltration, natural, and mechanical
Fresh air proportion required by code.

8. HVAC Safety Loose hair, jewelry, wristbands, clothing
Situational awareness
Disconnect OFF
Lock-out Tag-out
Safety glasses
Right tool for the job

9. VOM Basics
Alternating current (AC)
Direct current (DC)
Continuity

10. VOM Basics Measuring voltage – Select type of power and range
If unsure select highest range
Measure voltage to ground
Checking fuses –
Select Continuity (diode symbol)
Place probes at each end of the fuse
If the fuse is good, then tone and reading 0

11. A/C Fundamentals

12. A/C Fundamentals Straight Cooling

13. A/C Fundamentals Heat Pump

14. Operation Cooling Liquid line should be warm
Supply air should be about 15F lower than return air
Condenser discharge air should be warm

15. Operation Heating (heat pump) Suction line should be warm
Supply air temp should be 100F – 115F
Condenser discharge air should be cold

16. Controls

17. Controls Thermostat Wiring (Straight Cool)

18. Controls Thermostat Wiring (Heat Pump)

19. Controls Straight Cooling
Red Thermostat, Air Handler, Condenser
Yellow Thermostat, Condenser
White Thermostat, Air Handler
Green Thermostat, Air Handler

20. Controls Heat 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

21. 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

22. 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.

23. Problems A/C not working (running) Airflow temperature Filters Coils
Condenser operation

24. Problems Condenser troubleshooting Power Low voltage terminals
Discharge air temperature
Liquid line temperature (cooling)

25. Problems Space too hot/cold (A/C working) Filters Dampers Controls
Check for airflow
Filters
Dampers
Controls

26. Problems “Smudging” – Dirty filters Squealing Dirty coil
Particle entrainment
Squealing
On start-up Belts slipping
While operating – Belts too tight

27. Problems Evaporator icing Low airflow – Dirty filters Condenser icing
Dirty coil
Low refrigerant charge
Condenser icing

28. Revisiting the HVAC Systems
Outside air
Diffuser vanes
Balancing dampers
Fire dampers
Controls
Air handling equipment

29. Outside Air

30. Outside Air Ventilation air Required by code ASHRAE 62.1-2007
Requirements vary by occupancy
Amount for each system found in the balancing report.

31. Outside Air Formula: (MA – RA)/(OA – RA) Where: MA = Mixed air temp
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

32. Temperature method in action
Outside Air
Temperature method in action
Conditions: Outside air temp: 30F
Return air temp: 70F
Mixed air temp: 64F
Formula: (64 – 70)/(30 – 70) = 0.15
or 15% outside air.

33. 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.

34. 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

35. 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.

36. Controls Ensure that the thermostat is level.
Electronic thermostats programmed correctly.

37. Air Handling Equipment
Change filters every month
Orient filters correctly
More often in dirty environments (laundry)
Pre-filters in dirty environments
Clean coils annually
Keep fans clean
Exhaust fans

38. Air Handling Equipment
Make sure that belts are tight and aligned
Recommended 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 switches
Wired between transformer and control board

39. PTAC Package Terminal Air Conditioner Line fuse – 15A buss fuse
Power
Line fuse – 15A buss fuse
24VAC to control board
Control board trouble code
Power at control board terminals
3A buss fuse
No power from board – replace
Compressor makes ‘chugging’ noise – dying

40. 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

41. Property Refrigeration
Guest room refrigerators
Power
Coil
Loaded
Defrost

42. Ice Maker

43. Ice Maker Freeze Cycle

44. Ice Maker Harvest Cycle

45. Ice Maker Troubleshooting
Download service manual from manufacturer
Ice maker and bin may have different model numbers.
Sequence of operations
Trouble codes
Troubleshooting help

46. Ice Maker Troubleshooting
Leaks
Drain line intact
Over floor drain
Debris in ice bin
Water line

47. Ice Maker Troubleshooting
Little or no ice
Clean condenser coil
Float switch
Ice curtain stuck
Water line obstruction

48. Wrapping Up Improve guest experience Save energy Extend equipment life
Reduce maintenance
Reduce service calls
Questions?