CENTRAL HEATING Try to answer the following multiple-choice questions.
SCENARIO: A customer calls you out to a problem with their central heating system. They have been in the roof space and found it very damp and full of steam. You investigate Q1 Ans. and observe the feed and expansion cistern is blowing water out of the vent pipe and overflowing. At the same time, the float valve is running, and the water is being drawn. What might this issue be?
a
The boiler is set too high
b
The cold feed and vent are incorrectly connected onto the system
c
The pump is set too high
d
There is a blocked feed pipe forcing water up
SCENARIO: A customer has a problem with their central heating system not getting warm enough. It comes on but soon seems to Q2 go cooler. They have bought a new remote Ans. room stat and placed it in their lounge. In the lounge they use a log effect gas fire for comfort. What is the potential issue with their system?
SCENARIO: The customer calls you out because their condensing boiler has not come on after Q3 a period of freezing cold night and day. Identify the common cause from the list below.
a
The water pressure might have dropped off
b
The condense pipe has frozen
c
The boiler has frozen in their kitchen
d
The gas has frozen
SCENARIO: A newly installed underfloor heating system is not providing the heat output as Q4 designed on one section/coil set within a Ans. solid floor. The client has had new carpets fitted since commissioning. What might be the issue? a
The system needs balancing
b
The pump is too small
a
The room stat is within the same room as the gas fire and being affected
c
Pipework might be airlocked
b
The zone valve is not staying open when called upon by the room stat
d
The carpets are too thick
c
The pump is not wired in correctly and stops each time the boiler stops
d
The room stat is faulty
Go to hip-magazine.co.uk to download exercise answers for free
54
H IP I SUMME R 2 0 2 1 I E XE RC IS E S
Ans.
