ESIE13-03
|
Part 2. Troubleshooting
3. Symptom based troubleshooting
13/05/15
|
Version 2.0
Page 41
Ground source heat pump
3.3. Capacity shortage - Domestic hot water operation
Root cause category: component - electrical
3-way valve blocked.
Component failure.
Check the 3-way valve(see
).
Replace the 3-way valve (see
) and (see
Root cause category: system design
Water circuit - requested
capacity too high.
Incorrect system selection.
Check required capacity by
heat load calculation. Refer to
the capacity tables in the engi-
neering databook to know
max. system capacity at indi-
cated conditions.
Adapt system design.
Water circuit - water volume
too big.
• Long
water
piping.
• Too many heating emitters.
Check required capacity by
heat load calculation. Refer to
the capacity tables in the engi-
neering databook to know
max. system capacity at indi-
cated conditions.
Adapt system design.
Water circuit - pressure drop
too big.
• Too small water piping.
• Too long water piping.
• Too many heating emitters.
Compare the pressure drop of
the total system with the water
pump characteristics (refer to
check of water pump).
Decreased water flow will
cause a drop in capacity.
Adapt system design.
I
NFORMATION
"Capacity shortage - General" on page 37
for an overview of the general causes (both for space heating and
domestic hot water) which can lead to capacity shortage.
Possible failures
Root cause
Check
Corrective action
Root cause category: end user
Too low domestic hot water
setpoint.
User set too low domestic hot
water setpoint by schedule or
manual operation.
Check domestic hot water tank
set temperature in combina-
tion with boiler volume and hot
water usage.
Adapt domestic hot water set-
point (e.g. 50-55°C).
(Remark: check the weather
dependent settings (relation
outdoor temperature - set-
point) in case weather
dependent control is acti-
vated.)
Domestic hot water not acti-
vated.
Check if domestic hot water
heating is activated.
Root cause category: parameter (setting)
Setting domestic hot water
operation mode [6-0D] not set
optimally.
Setting domestic hot water
operation mode [6-0D] is set to
2 (scheduled only).
Check setting [6-0D].
In case schedule only is used
assure that the programmed
schedule is inline with the tim-
ings hot water is required.
Adapt the schedules when
necessary.
Root cause category: installation
3-way valve does not switch
correctly between space heat-
ing connection and domestic
hot water connection.
3-way valve incorrectly
mounted.
Check the 3-way valve (see
).
Correct the position of the
3-way valve (see
Possible failures
Root cause
Check
Corrective action
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