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EPA > EPA Type 3 > Flashcards

EPA Type 3 Flashcards

1
Q

The purpose of the purge unit on a low pressure chiller is to

A

Remove non condensable gases from the top of the condenser

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2
Q

The rupture disc of a low pressure chiller is connected to the

A

Low side

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3
Q

What is the maximum pressure to which one should pressurize an r11 chiller in order to leak test it

A

10psig

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4
Q

What must be done to the oil in a chiller sump before removing it

A

Must be heated to 130* to drive out any refrigerant

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5
Q

An r11 centrifugal chiller is charged through the valve located at the

A

Bottom of the evaporator barrel

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6
Q

300 ton, r123 chiller supplying chilled water for conditioning a library must be repaired if it leaks at a rate of more than __ annually

A

15%

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7
Q

A 1,000 ton, low pressure chiller used to cool water must not be allowed to leak refrigerant at a rate greater than __ of its total charge annually without being repaired

A

35%

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8
Q

Low side pressure in a r11 chiller which is providing 45*F chilled water for a/c would be

A

16” hg

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9
Q

When disposing of a r123 chiller, the refrigerant must be removed down to a pressure of __ before being dismantled

A

29” hg

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10
Q

If the oil sump in a centrifugal chiller is not heated during refrigerant recovery, what can be the result

A

After required recovery is reached, system pressure may rise again

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11
Q

How are water tube leaks found in low pressure chillers

A

Hydrostatic tube test

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12
Q

Reward for providing information leading to the conviction of someone violating section 608of the clean air act can be as much as

A

$10,000 per day per violation

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13
Q

What can happen to a low pressure chillers evaporator tubes if water is allowed to stand in them during refrigerant recovery

A

The water can freeze

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14
Q

If a recovery machine is being used to pressurize a system to recover liquid refrigerant, what can happen if it discharges at a pressure greater than 15psig

A

It can burst the rupture disc on the chiller

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15
Q

The discharge from a purge unit should be piped where

A

Outdoors

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16
Q

Excessive purging from a chiller purge system can be an indication of

A

Non condensable gases leaking into the chiller

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17
Q

Using a controlled hot water pressurization system to raise the chillers pressure to atmospheric in order to replace a non major component of the chiller is

A

Allowed

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18
Q

Which refrigerant is an interim, retrofit replacement for r11in low pressure chillers

A

R123

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19
Q

After recovering just the liquid refrigerant from a 350 ton r11 chiller how much refrigerant would still be in the system in vapor form

A

About 100 lbs

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20
Q

R123 is classified by ASHRAE as a __ refrigerant with regard to its toxicity and flammability

A

B1

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21
Q

How should one remove frost from the sight glass of a chiller

A

Spray alcohol on it

22
Q

Recovery machines used for low pressure systems will use what water source to cool their internal condensers

A

Local water supply

23
Q

The preferred method for pressurizing a low pressure chiller for leak testing would be to

A

Use a controlled heated water system to warm the chiller up

24
Q

Because a low pressure system operates below atmospheric pressure, leaks in the

A

Gaskets or fittings will cause air and moisture to enter the system

25
Q

When charging a system with a low pressure, refrigerant should be introduced as a vapor to raise saturation temperature to a minimum of

A

36*

26
Q

EPA required evacuation levels for recovery of recycling equipment manufactured or imported on or after Nov. 15, 93 is

A

25mm hg absolute

27
Q

If a strong odor is detected during the recovery process

A

A compressor burn out may have occurred

28
Q

A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of __ of the total charge

A

15%

29
Q

A rupture disc for a low pressure chiller will rupture at

A

15psig

30
Q

What refrigerant has a safety classification of B1

A

R123

31
Q

When installing more than one, pressure relief valves must be installed

A

In parallel

32
Q

When pressurizing a system do not exceed

A

10psig

33
Q

ASHRAE 34 standard safety classifies r134a as

A

A1

34
Q

After reaching the required vacuum on an appliance when servicing, moisture is indicated by

A

Multiple rises in pressure with an increase of pauses between rises

35
Q

In a chiller, air and other non condensable collect

A

At the top section of the condenser

36
Q

Who establishes the refrigerant safety group standard

A

ASHRAE

37
Q

What type of equipment can be worked on with type 3 certification

A

Low pressure

38
Q

To repair a chiller operating with r22 a technician must have a

A

Type 2 certification

39
Q

The owner must keep records of refrigerant added during service and maintenance on equipment with charges of __

A

50lbs or greater

40
Q

After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system

A

100lbs

41
Q

Where is the purge unit located in a low pressure system

A

The top of the condenser

42
Q

When leak testing a low pressure chiller, the max pressure to use is

A

10psig

43
Q

During evacuation of systems with large amounts of water, it may be necessary to

A

Increase pressure by introducing nitrogen to counteract freezing

44
Q

What can be used to pressurize a chiller system before opening the system for a non major repair

A

Controlled hot water

45
Q

Refrigerant recovery from a system using r11 or r123 starts with

A

Liquid removal followed by vapor recovery

46
Q

The standard for machine room safety is

A

ASHRAE standard 15

47
Q

The most efficient method of leak checking a charged low pressure refrigeration unit is to

A

Pressurize the system by the use of controlled hot water or heater blankets

48
Q

EPA required evacuation levels for recovery or recycling equipment manufactured or imported before Nov. 15, 93 is

A

25” hg

49
Q

In an equipment room containing a r123 chiller a refrigerant specific sensor must be used to warn of leaks

A

True

50
Q

When recharging an evacuated chiller with r11, vapor must first be introduced until the pressure in the chiller exceeds __ in order to make sure that water doesn’t freeze in the evaporator tubes

A

17” hg

EPA (2 decks)

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