NYC NYCHA THERMOSTAT REPAIRER EXAMINATION
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
1. Which primary function does a thermostat perform within a typical HVAC
control system?
A. Increase electrical voltage throughout the building
B. Sense temperature and initiate control action based on a setpoint
C. Increase water pressure inside heating pipes
D. Remove dust from ventilation ducts
Answer: B
Rationale: A thermostat senses temperature and controls heating or cooling
equipment according to the selected setpoint.
2. When a room thermostat calls for heat, what normally occurs first within the
control sequence?
A. The building's main electrical service disconnects
B. The thermostat changes its control output or contacts
C. The radiator immediately becomes permanently isolated
D. The boiler automatically drains completely
Answer: B
Rationale: A call for heat causes the thermostat to change an electrical,
pneumatic, or electronic control signal.
3. What does the thermostat setpoint represent during normal heating-system
operation in an occupied space?
A. The temperature the control attempts to maintain
B. The maximum boiler pressure allowed
,C. The electrical resistance of the thermostat
D. The amount of airflow through a duct
Answer: A
Rationale: The setpoint is the desired temperature used by the control system to
regulate operation.
4. Why should a thermostat generally be installed away from direct sunlight and
other unusual heat sources?
A. Heat sources can cause inaccurate temperature sensing
B. Sunlight increases the thermostat's electrical voltage
C. Heat sources permanently reduce pipe pressure
D. Thermostats require complete darkness to function
Answer: A
Rationale: External heat can make the thermostat sense a temperature different
from the actual room conditions.
5. What condition can occur when a thermostat is installed near a drafty
doorway or open window?
A. It may sense an unrepresentative temperature and cycle incorrectly
B. It always increases boiler water pressure
C. It permanently disables every heating zone
D. It automatically calibrates itself
Answer: A
Rationale: Drafts can create localized temperature conditions that do not
represent the room's average temperature.
6. Which component of a conventional mechanical thermostat physically
responds to temperature changes?
A. Temperature-sensing element
,B. Circuit breaker panel
C. Air compressor motor
D. Condensate pump
Answer: A
Rationale: Mechanical thermostats use temperature-sensitive elements to initiate
control movement.
7. What is the purpose of a thermostat differential or deadband in HVAC
control?
A. Prevent excessive rapid cycling of equipment
B. Increase the building's electrical supply voltage
C. Eliminate the need for temperature sensing
D. Increase steam pressure in every radiator
Answer: A
Rationale: Differential provides a temperature range that prevents equipment
from switching on and off excessively.
8. If a thermostat repeatedly turns heating equipment on and off within very
short intervals, what should be investigated first?
A. Control differential and sensing conditions
B. Building paint color
C. Exterior sidewalk condition
D. Domestic water fixture size
Answer: A
Rationale: Rapid cycling can result from improper differential, poor thermostat
location, oversizing, or control problems.
9. What is the safest general approach when troubleshooting an unfamiliar
thermostat control circuit?
, A. Randomly move wires until equipment starts operating
B. Identify the circuit, review its sequence, and test systematically
C. Bypass every safety control immediately
D. Replace the thermostat without testing anything
Answer: B
Rationale: Systematic troubleshooting reduces mistakes and protects equipment
and personnel.
10. Which instrument is commonly used to measure electrical voltage during
thermostat troubleshooting?
A. Manometer
B. Multimeter
C. Pipe wrench
D. Thermometer only
Answer: B
Rationale: A properly rated multimeter can measure electrical voltage and other
circuit parameters.
11. What should a technician verify before using a multimeter on an electrical
control circuit?
A. Meter rating, test leads, and appropriate measurement function
B. Paint thickness on the thermostat cover
C. Room furniture arrangement
D. Boiler water color
Answer: A
Rationale: Correct meter setup and rating are essential for safe and accurate
electrical testing.
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
1. Which primary function does a thermostat perform within a typical HVAC
control system?
A. Increase electrical voltage throughout the building
B. Sense temperature and initiate control action based on a setpoint
C. Increase water pressure inside heating pipes
D. Remove dust from ventilation ducts
Answer: B
Rationale: A thermostat senses temperature and controls heating or cooling
equipment according to the selected setpoint.
2. When a room thermostat calls for heat, what normally occurs first within the
control sequence?
A. The building's main electrical service disconnects
B. The thermostat changes its control output or contacts
C. The radiator immediately becomes permanently isolated
D. The boiler automatically drains completely
Answer: B
Rationale: A call for heat causes the thermostat to change an electrical,
pneumatic, or electronic control signal.
3. What does the thermostat setpoint represent during normal heating-system
operation in an occupied space?
A. The temperature the control attempts to maintain
B. The maximum boiler pressure allowed
,C. The electrical resistance of the thermostat
D. The amount of airflow through a duct
Answer: A
Rationale: The setpoint is the desired temperature used by the control system to
regulate operation.
4. Why should a thermostat generally be installed away from direct sunlight and
other unusual heat sources?
A. Heat sources can cause inaccurate temperature sensing
B. Sunlight increases the thermostat's electrical voltage
C. Heat sources permanently reduce pipe pressure
D. Thermostats require complete darkness to function
Answer: A
Rationale: External heat can make the thermostat sense a temperature different
from the actual room conditions.
5. What condition can occur when a thermostat is installed near a drafty
doorway or open window?
A. It may sense an unrepresentative temperature and cycle incorrectly
B. It always increases boiler water pressure
C. It permanently disables every heating zone
D. It automatically calibrates itself
Answer: A
Rationale: Drafts can create localized temperature conditions that do not
represent the room's average temperature.
6. Which component of a conventional mechanical thermostat physically
responds to temperature changes?
A. Temperature-sensing element
,B. Circuit breaker panel
C. Air compressor motor
D. Condensate pump
Answer: A
Rationale: Mechanical thermostats use temperature-sensitive elements to initiate
control movement.
7. What is the purpose of a thermostat differential or deadband in HVAC
control?
A. Prevent excessive rapid cycling of equipment
B. Increase the building's electrical supply voltage
C. Eliminate the need for temperature sensing
D. Increase steam pressure in every radiator
Answer: A
Rationale: Differential provides a temperature range that prevents equipment
from switching on and off excessively.
8. If a thermostat repeatedly turns heating equipment on and off within very
short intervals, what should be investigated first?
A. Control differential and sensing conditions
B. Building paint color
C. Exterior sidewalk condition
D. Domestic water fixture size
Answer: A
Rationale: Rapid cycling can result from improper differential, poor thermostat
location, oversizing, or control problems.
9. What is the safest general approach when troubleshooting an unfamiliar
thermostat control circuit?
, A. Randomly move wires until equipment starts operating
B. Identify the circuit, review its sequence, and test systematically
C. Bypass every safety control immediately
D. Replace the thermostat without testing anything
Answer: B
Rationale: Systematic troubleshooting reduces mistakes and protects equipment
and personnel.
10. Which instrument is commonly used to measure electrical voltage during
thermostat troubleshooting?
A. Manometer
B. Multimeter
C. Pipe wrench
D. Thermometer only
Answer: B
Rationale: A properly rated multimeter can measure electrical voltage and other
circuit parameters.
11. What should a technician verify before using a multimeter on an electrical
control circuit?
A. Meter rating, test leads, and appropriate measurement function
B. Paint thickness on the thermostat cover
C. Room furniture arrangement
D. Boiler water color
Answer: A
Rationale: Correct meter setup and rating are essential for safe and accurate
electrical testing.
