System 3: Single Boiler With One Heating Zone, Outdoor Reset With Room Feedback And Dhw Priority - Buderus Logamax plus GB162 Applications Manual

GB162 Applications Manual
3.3 System 3: Single boiler with one heating zone, outdoor reset with
room feedback and DHW priority
Summary:
Ideal setup for large open floor plans, e.g. restaurants,
churches, retail, shop floors, etc.
Single boiler system supplying one zone
• Outdoor reset with room feedback
• RC35 room sensor and user interface installed in a
reference room for room feedback
• Zone pump is controlled by the boiler
• Separate day and night temperature program with multiple
setpoints for the heating zone and DHW separately
• DHW loading with or without priority
• Maximum efficiency from outdoor reset based on heat loss
of the structure and maximum comfort from room feedback
• Upgradable to DHW Solar Thermal (see system 4)
In detail:
The RC35 computes a quantified heat demand for the structure
based on information from the outdoor sensor, its internal room
sensor, and the heating curve. Applications include a high,
medium and low temperature zone (e.g. radiant floor, panel
radiators, baseboard or hydro-air).
Day and night temperatures can be set based on the unique
requirements of the zone and when occupants will be present
and absent.
The WM10 module controls the zone pump in constant
circulation which prevents temperature swings and provides
maximum comfort. Low energy pump recommended.
The modulating boiler strives to run at low fire for the longest
time possible where efficiency is at its highest.
DHW is heated according to a customized timer program. DHW
priority over space heating can be enabled or disabled. DHW
single charge button is used to reload the tank during night
mode.
The RC35 user interface come equiped with integrated
room sensor and full text display for easy programming and
operation.
Displays outdoor temperature curve for yesterday and today.
Holiday function allows reduced temperatures during absence
and bringing the space back to temperature in time when
returning home.
Solar Thermal DHW functionality integrated in controls for easy
retrofit (see system 4)
The low loss header decouples the boiler loop from the system
loop.
DHW recirculation pump functionality built in with separate timer
program.
Logamax plus GB162 applications manual | 03.2013
Required components:
• GB162 boiler
• RC35 controller
• WM10 LLH module
• PH system circulator
• PS DHW tank loading circulator
• ECM pumps (low energy or constant pressure pumps) are
recommended for constant flow rate and additional energy
savings.
Additional instructions:
Install the system supply temperature sensor FK after the
system pump in order to be able to detect a defective pump.
Install the DHW tank temperature sensor FW in the tank per the
tank instructions. The RC35 is designed for constant circulation.
Do not combine the RC35 with zone valves or a relay panel.
Control modes
The following control modes are available with the RC35:
• Outdoor reset (factory default):
The system water temperature is calculated in response to
the outdoor temperature. This temperature is then delivered
to the zones by a constantly operating heating zone pump.
The pump will only shut-down in warm weather shut
down, night setback (shut-down mode only) or DHW mode
(domestic hot water priority only). Install the RC35 unit in
the boiler, or in the room with maximum room influence set
to 0 (factory setting).
• Outdoor reset with room influence:
The RC35 must be installed in a reference room in order
to record the room temperature accurately. The higher the
room influence parameter set the greater its influence on
the heating curve. If maximum room influence is set to 0
(factory setting), room feedback is disabled.
• Room reset:
With outdoor reset disabled and the RC35 installed in a
reference room the system water temperature is influenced
only by the conditions in the room. Applications include
super insulated structures, or rooms with significant solar
gain, auxiliary heat (wood stove), or similar.
Technical specifi cations are subject to change without prior notice
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