HVAC 1
RECEIVES THERMOSTAT INPUTS FROM MULTIPLE ZONES AND TELLS DAMPERS WHEN TO OPEN AND CLOSE AND THE HVAC EQUIPMENT WHEN TO RUN
WHAT IS?
ZONE BOARD
A MESURMENT OF AIR FLOW. STATIC PRESURE IS A RESISTANCE THE FAN MUST OVERCOME TO PUSH AIR THROUGH THE DUCT SYSTEM
WHAT IS?
CUBIC FEET MINUTE OR CFM
HVAC metering devices that regulate refrigerant
fixed orifices (capillary tubes and pistons)
Modulating valves (TXV, EEVs, AXVs)
A MOTORIZED OR MANUEL FLAP INSIDE THE DUCTWORK THAT OPENS AND CLOSES TO CONTROL AIRFLOW TO A ZONE
WHAT IS?
ZONE DAMPER
A THERMOSTAT CONTROLLING A SECONDARY ZONE IN A MULTI ZONE SYSTEM
WHAT IS?
SLAVE T-STAT
THE RESISTANCE TO RESISTANCE TO AIRFLOW IN THE DUCT SYSTEM, MEASURED IN INCHES OF WATER COLUMN (IN. W.C.)
WHAT IS?
STATIC PRESURE
A DAMPER THAT REDIRECTS EXCESS AIR FROM THE SUPPLY DUCT BACK INTO THE RETURN DUCT HELP MANAGE STATIC PRESURE
WHAT IS?
BYPASS DAMPER
A SENSOR MOUNTED IN THE SUPPLY PLENUM TO MEASURE AIR TEMPUERATURE LEAVING THE HVAC UNIT
WHAT IS?
DATS (DISCHARGE AIR TEMPERATUREB SENSOR)
THE PRIMARY THERMOSTAT IN A ZONING SYSTEM TYPICALLY CONTROLS THE PRIORITY ZONE
WHAT IS?
MASTER T-STAT (MASTER THERMOSTAT)
WHAT TYPE OF CAPACITORS ARE THERE IN AN HVAC SYSTEM
WHAT IS?
RUN CAPACITORS AND START CAPACITORS
WHICH REFRIGERANT IS AN HCFC?
R-22 R-410 R134A R-12
WHAT IS?
R-22
two ways to check compressor
Ohming and check to ground
TERM USED WHEN WEARING SAFTEY GLASSES, GLOVES, BOOTS,
WHAT IS?
PPE (PERSONAL PROTECTIVE EQUIPMENT)
PROCEDURE USED FOR DISCONNECTING AND LOCKING OUT POWER BEFORE SERVICING ELECTRICAL EQUIPMENT
WHAT IS?
(LOTO) LOCKOUT/TAGOUT
WHAT DO YOU NEED WHEN YOU WORK IN AN AREA DEALING WITH REFRIGERANTS AND COMBUSTABLE GASES OR CHEMICALS
WHAT IS? VENTILATION
THIS SAFTEY DEVICE OFTEN TRIPS FIRST WHEN THERE'S AN ELECTRICAL SHORT ORVERLOAD
WHAT IS A BREAKER OR FUSE
IF YOUR SYSTEM HAS 120V ON THE PRIMARY BUT NO 24V ON THE SECONDARY, THIS PART HAS FAILED.
WHAT IS THE TRANSFORMER?
THIS DEVICE ON THE WALL MUST CALL FOR COOLING OR HEATING BEFORE ANYTHING ELSE HAPPENS
WHAT IS THE THERMOSTAT?
A DIRTY ONE OF THESE CAN CAUSE LOW AIRFLOW, HIGH HEAD PRESURE, OR A FROZEN COIL.
WHAT IS THE AIR FILTER?
THESE PASSAGES CARRY CONDITIONED AIR AND MAY BE COLLAPSED, BLOCKED, OR LEAKING.
WHAT ARE THE DUCTS?
A DIRTY ONE OF THESE OUTSIDE CAN CAUSE HIGH HEAD PREESURE AND POOR COOLING
WHAT IS THE CONDENSER COIL?
WHEN SUCTION PRESURE IS LOW, IT COULD BE CAUSED BY UNDERCHARGE, RESTRICTION, OR THIS CONDITION.
WHAT IS LOW airflow
what does a vacuum pump do at least 2 answers
Removes air, moisture, and other contaminants
THE FURNACE MOTOR MUST START TO PROVE DRAFT BEFORE IGNITION
WHAT IS THE INDUCER MOTOR?
A DIRTY ONE OF THESE CAN CAUSE BURNERS TO SHUT DOWNAFTER A FEW SECONDS
WHAT IS THE FLAME SENSOR?