TSSA G2 Exam Review (Halton Skilled Trades Academy)

True or False: A power venter certified as an add on may be used on a Water Heater with a maximum input of 50,000 BTU

True

What is required to determine the size of a Circulator Pump to be used on a Combination Heating System

The required Flow Rate and Head Pressure of the Heating Loop

1GPM = 10,000 BTU

How many 100lb Propane Cylinders can be used inside a building under construction

3

Minimum CFM for a Primary Bedroom

20 CFM

(Every other room = 10 CFM)

When installing the Vent of a gas appliance in a chimney already venting an appliance burning a liquid fuel, where the vent should be installed

Above the level of the liquid fuel burning appliance

What controls the increase or decrease of gas flow to the appliance on a gas Regulator

Restricting Element

What senses outlet pressure on a Regulator

Measuring Element

The standard rule for sizing a Vent or Chimney which will vent more than one appliance

The area of the Common Vent shall equal the area of either the largest draft control device/flue outlet plus 50% of the sum of the outlet areas of the additional appliances

1 Horse Power = ___________ BTU

34,000 BTU

Standard Sizing for a Circ Pump

1 GPM = 10,000 BTU

How many BTU's in a US Gallon of Oil

1 GPH = 140,000 BTU

Normal Supply Voltage to an AC Condenser

240v AC

How long a Cylinder can be used before it must be re-conditioned

10 Years

Allowable Level of CO in Flue Products

Furnace: 400 PPM

Boiler <300,000BTU: 100 PPM

Allowable Level of CO in Ambient Air

50 PPM

Acceptable: 0PPM

How much Frost you should let accumulate on Evaporator Fins before defrosting

50%

Purpose of a Monitor Regulator

Safety Regulator that backs up the Working

Temperature of Flue Gases if an Appliance had 100% Efficiency

Equal to Ambient Air/Room Temperature

Why the Recommended Level of CO2 is different for an Oil to NG Conversion

Larger Safety Margin is needed

4 Main Components of an EAC (Electronic Air Cleaner)

1. Pre Filter

2. Collection Section

3. Charging Section

4. Power Pack

(Ionizing Wires, High Voltage Transformer, Collector Plates)

Result if the Pre-Filter in an EAC gets plugged on a System in cooling mode

Cooling Coil frosts

Result if the Filter on a Furnace gets completely plugged

Turns off on High Limit

-No Air Flow over Heat Exchanger

A Bellow Gas Meter is also known as a ______________ Displacement Meter and is used for ______________ Applications

-Pressure Displacement Meter

-Residential and small/mid Commercial Applications

A Rotary Gas Meter is also known as a ______________ Displacement Meter and is used for ______________ Applications

-Positive Displacement Meter

-Large Commercial Applications

Type of Heat Transfer used by a Commercial Forced Air Furnace

Conductive (Heat Exchanger)

"Temperature Rise" of a Hot Water Heater

Water temperature difference across the heater

What the temperature of the water returning from the Heating Loop in a Combination System must be

Lower than the minimum temperature required to activate the burner

As the Outlet Temperature from a Water Heater to a Heating Loop decreases, the Heating Output from the Air Handler _____________

Decreases

The lower the Return Air Temperature to an Air Handler, the ___________ the Heating Output from the Air Handler

Higher

When a Thermistor is heated, Resistance _____________ and Current Flow _____________

Resistance Decreases

Current Flow Increases

When a Wire is heated, Resistance _____________ and Current Flow _____________

Resistance Increases

Current Flow Decreases

As the length of a Wire increases, the Voltage Drop will ____________

Increase

4 Elements of a Pressure Regulator

1. Atmospheric Vent

2. Restricting Element -Valve, Disc, Plug

3. Measuring Element -Diaphragm

4. Loading Element -Spring

What a Pilot with a lazy, yellow Flame indicates

Orifice Size too large

What a Pilot with a hard, sharp Flame indicates

Orifice Size too small

Most important factor for Flame Rectification

Proper Grounding Plane

If the Flue Gases are removed from the front of the Appliance, we could assume that it's a ___ to ___ Flue pasts Boiler

2 to 4

Can a Gas Log Fireplace be installed in a Sleeping Quarter?

No

Can a Gas Log Set be installed in a Sleeping Quarter?

Yes, if approved by the Manufacturer

On a Pressuretrol, the main Burner starts on __________________

Pressure Differential

A Draft Hood ensures a ___________ over Fire Draft

Zero/Neutral

Draft Control Device that ensures a Negative over Fire Draft

Barometric Damper

Draft Control Device that ensures a Zero/Neutral over Fire Draft

Draft Hood

Type of Gas Meter used for Commercial applications

Rotary Type

What turns on the Blower Fan in a High Efficiency Furnace?

Relay Timer

What a Barometric Damper controls

Flue Gas Air dilution

What 1 Coil type Boiler over 400,000BTU would need

Flow Sensor & High Limit

What the Carry-Over Ports on a Decorative Appliance with an H-Shape Burner ensure

Ignition of Burner

How the Temperature Sensor on a Pool Heater should be set on seasonal start-up

Intermittently

Why Pool Heaters break down/rust easier than other appliances and how to prevent it

-Chemicals, located outdoors

-Prevent by installing indoors

Temperature a High Intensity Infrared Heater could reach

1800℉

Where you would install a Surge Limiting Device

Regulator

Purpose of a Heat Anticipator

Determines length of the Burner "on" cycle

Purpose of a Spiral Baffle

Slow Flue Gases

What Natural Gas is mainly composed of

Methane & Ethane

Who regulates the testing of Venting Material

U.L.C

Temperature Flue Gases condensate at

127℉

Heat which when added/removed changes the Temperature of a substance without changing its State

Sensible Heat

Heat which when added/removed changes the State of a substance without changing its Temperature

Latent Heat

On a Combination Limit Control, temperature at which Blower Fan turns off at

100℉

An Appliance should not drop below less than ______% of the Rated Input

90%

Scotch Marine is what type of Boiler?

Fire-Tube

Increasing the size of the Blower Pulley will ______________ the Air Flow

Decrease

Increasing the size of the Motor Pulley will ______________ the Air Flow

Increase

If the Belt on a Blower is too tight, Motor current will _____________

Increase

Closing Up/Moving In the Motor Pulley will ______________ the Blower Speed

Increase

Steel Boilers are classified as _______________ Boilers

Water-Tube

The faster the Flow of Water through the Heating loop, the __________ the Temperature Drop

Lower

Maximum Relief Valve Setting for a Low Pressure Steam Boiler

15 PSIG

Maximum Relief Valve Setting for a Low Pressure Hot Water Boiler System

30 PSIG

Temperature & Pressure Relief Valve Setting on an Hot Water System

150 PSIG 210℉

Capacity and Relief Valve Setting on a Propane Tank

85% and 250 PSIG

Capacity and Relief Valve Setting on a Propane Cylinder

80% and 375 PSIG

What is the approximate O2 reading for Natural Gas

3%

Where GFCI's are normally used

Wet, Damp locations

Voltage of a Thermocouple

10-30mv DC

Voltage of a Thermopile

250-750mv DC

What is used to prevent and treat lime deposits in a Hot Water Tank

-Water Softener

Muriatic Acid

An Inverted Sensor is another name for a ______________

Dip Tube

1 Ton of Cooling = ______ CFM

1 Ton of Heating = ______ CFM

AC: 400 CFM

Heat Pump: 450 CFM

Combination Systems are sized to deliver ______% of the calculated Heat Loss of the building

120%

Approximate External Static Pressure in the Supply Air Plenum of a Forced Warm Air Furnace

0.20"wc - 0.50"wc

If an Air Conditioning System is added to a Heating System, it is recommended that a larger _____________ be installed

Motor Pulley

What is the cause of a "humming" noise from a Furnace

Reversed Polarity at the Gas Valve

The smallest dimension of a Combustion Air Supply Duct must not be less than __________

3in (Code 8.3.2)

What Flame Rods/Rectifiers utilize

Microamps

A Propane Service Regulator normally delivers pressure from _________ to _________

Pounds to 11"wc

A Natural Gas Service Regulator normally delivers pressure from _________ to _________

Pounds to 7"wc

What Fuses used in Motor Circuits must be

Time Delay / Slow Blow / Type D

When do Plate Humidifiers operate

All the time the Fan is running

What Bypass Humidifiers have that Plate Humidifiers do not

Flexible Ductwork

How is a Regulator sized for the Load it serves

Appliance Rating Plate and Regulator input range

When a Furnace-mounted Humidifier is used, shorter Furnace "on" cycles results in ____________

Inadequate Humidity Levels

What all Relay Contacts on an Electrical Schematic must be designated

The same as the coil that operates them

Why you should always disconnect at least one Lead when using a Jumper Wire to by-pass the Thermostat at the Gas Valve

If attached incorrectly, it may burn out the Heat Anticipator

What will happen when the Neutral Pressure Point for a Conversion Burner is improperly set

Burner efficiency will be affected

What happens when the Humidistat for a Power Humidifier closes

Humidifier Solenoid Valve opens

Most accurate way to determine the amount of Propane in a large Storage Tank

Roto or Slip Tube Gauge

You can undersize an A/C System at ____% and it will do a better job at removing ____________

85%

Humidity

How many volts does a HSI require to operate properly

120v AC

(110-125v AC, 90-115v AC)