Symptom: Space Heating Capacity Shortage - Daikin altherma 3 M Service Manual
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Also See for altherma 3 M:
- Installer's reference manual (280 pages) ,
- User reference manual (68 pages) ,
- Installation manual (52 pages)
Table of Contents
2.4.11 Symptom: Space heating capacity shortage
Possible failure
Too low leaving water
temperature setpoint.
Too low space heating
setpoint on room
thermostat.
Space heating NOT
activated.
Possible failure
External room thermostat
used with setting [C‑07] on
value 2 (= RT control).
Backup heater operation
disabled (setting [4‑00] is
set to 0).
Setting domestic hot water
operation mode [6‑0D]
NOT set optimally.
Possible failure
3‑way valve does NOT
switch correctly between
space heating (cooling)
connection and domestic
hot water connection.
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Root cause category: end user
Root cause
User set too low leaving
water temperature
setpoint by schedule or
manual operation.
User set too low room
setpoint by schedule or
manual operation.
Root cause category: parameter (setting)
Root cause
Wrong setting of [C‑07] -
unit control method.
Setting backup heater
operation mode [4‑00] is
set to 2 (ONLY domestic
hot water).
Setting domestic hot water
operation mode [6‑0D] is
set to 0 (reheat ONLY). This
will cause the system to
work too frequently in
domestic hot water
operation and less in space
heating.
Root cause category: installation
Root cause
3‑way valve incorrectly
mounted.
Check
Check leaving water
setpoint.
Check room thermostat
setpoint.
Check if space heating is
activated.
Check
Check setting [C‑07].
Check setting [4‑00].
Check setting [6‑0D].
Check
Check the 3‑way valve.
2
Troubleshooting
|
Repair
Adapt leaving water
setpoint.
(Remark: check the
weather dependent
settings (relation outdoor
temperature - setpoint) in
case weather dependent
control is activated.)
Adapt room thermostat
setpoint.
(Remark: check the
weather dependent
settings (relation outdoor
temperature - setpoint) in
case weather dependent
control is activated.)
Repair
Adjust setting to match
application - see installer
reference guide.
Change setting [4‑00] to 1.
It is advisable to set to
factory setting (reheat +
schedule) and program the
schedule to heat the
domestic hot water during
periods of no space
heating required.
Repair
Correct the position of the
3‑way valve.
Service manual
79
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