www.hvactechgroup.com - forums

HVAC Forums => HVAC Help => Topic started by: preetnep on November 02, 2015, 09:11:50 PM

Title: 313d exam question
Post by: preetnep on November 02, 2015, 09:11:50 PM
1  what does thermal balance point mean in relation to heat pump.
2. When condensing unit are installed above air handler what Co sideration must be taken
a size and type of metering device
b size and type of evaporator
C indoor blower speed
D outdoor blower speed

3. In a refrigeration system suction and discharge line should slope towards compressor or the direction of flow?
4. On a refrigeration system employing cylinder unloading as a method of capacity control , when will compressor cylinder begin to load?
A as suction pressure decreases
B as suction pressure increase

5. A condensing unit serving  critical process which cannot be shut down is found to be very short of refrigerant and slightly short of oilwhat would u first
A find ref leak and repair it
B bring ref charge to proper level
C bring oil to proper level

6. Recycled refrigerant can change ownership or not
Title: Re: 313d exam question
Post by: Admin on February 13, 2016, 08:47:36 AM
1. TBP - thermal balance point is the temperature at which the amount of heating provided by the heat pump equals the amount of heat lost from the house.
EBP - economical balance point is the lowest temperature at which the operation of the heat pump is most cost effective.


3. Slope towards the evaporator.

4. Suction pressure increases to load, and decreases to unload.

5. Find leak and repair it.

6. No.  Refrigerant must be recovered from equipment before its disposal. This refrigerant can be reclaimed by a third party for future use or recycled for use in the original owner's other equipment, as part of their phaseout strategy. (Download the Environmental Code of Practice for Elimination document  - Here (http://www.hvactechgroup.com/article.php/20070624134517615))
Title: Re: 313d exam question
Post by: rmuntz on May 05, 2016, 06:16:28 PM
#2 doesn't make sense. The answer would be oil return.