GB.GOLDSKE.160901
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We reserve the right to alter specifications without notice.
6.4.2.13 Intermittent night heat
The AHU is utilized for heating the premises when it is normally
stopped by timer.
The function requires that an external room sensor is wired to
the control unit’s communication BUS (optional COM 1-3) and
that the AHU is fitted with an air heater for reheating the air. The
function works best if the GOLD is equipped with an air recircu-
lation section and shut-off dampers for the outdoor air and the
exhaust air.
When the function is activated, the air handling unit detects
when the room temperature drops below the preset start tem-
perature. The unit starts with preset flows and the supply air
temperature set point. At the same time, the damper in the air
recirculation section opens, if one is installed.
If recirculation is in the Off position, the extract air fan is opera-
ting and the damper relay is open. The extract airflow setting can
be decreased to the air handling unit‘s min. flow.
Intermittent night heat does not affect any possible extra tem-
perature zone (Xzone) which regulates according to its ordinary
set point if Intermittent night heat is in operation.
Conditions to be met for intermittent night-time heating to start:
• The AHU must be set to normal stop or extended
normal stop.
• The room temperature must be lower than the preset start
temperature.
Conditions to be met so that Intermittent night heat will stop:
• The air handling unit is running at normal low/high speed or
external/manual stop has been activated.
• The room temperature exceeds the preset stop temperature.
• The alarm with preset stop priority trips.
(If needed, the air handling unit fans will continue to operate
to cool the electric air heater although other conditions for
stop have been met.)
Settings:
Value Setting
range
Factory
setting
Intermittent night heat On/Off Off
Air recirculation On/Off On
Room temperature, start 5 - 25 °C 16 °C
Room temperature, stop 5 - 25 °C 18 °C
Supply air temperature, set
point
5 - 50 °C 28 °C
Supply airflow, set point
1)
50% of max.
supply air for
AHU alt. 100 Pa
Extract air flow, set point
1)
50% of max.
supply air for
AHU alt. 100 Pa
1)
The setting range is the same as the AHU's min./max. setting
for flow regulation and 10-750 Pa for pressure regulation
Intermittent night heat with air recirculation section:
Recirculation in the On position:
When conditions for start are met, outdoor air and exhaust air
shut-off dampers remain closed. The damper in the air recircula-
tion section opens. The extract air fan is idle.
The supply air fan operates according to the preset supply air-
flow and the air heater for reheating operates according to the
preset supply air temperature set point, until the conditions for
stop are met.
EXTRACT AIR
SUPPLY AIR
Intermittent night heat
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