Switch Sequence Diagram; Boiler Control; Introduction - REMEHA Gas 310 ECO Technical Information

8.5 Switch sequence diagram

fig. 18 Switch sequence diagram
04.31H.79.00003

8.6 Boiler control

8.6.1 Introduction

The Remeha Gas 310 ECO can be controlled using one
of the following methods:
Note: when using on/off control the boiler will also
modulate to maintain the flow temp set point (param-
eter !)
- Fully modulating, where the output modulates
between the minimum and maximum value on the
basis of the flow temperature defined by the modulat-
ing controller.
- Analog control (0-10 volts), where the heat output or
temperature is controlled by a 0-10 volt signal.
- On/ off control, (one-volt free relay) where the heat
output modulates between the minimum and maxi-
mum value on the basis of the flow temperature set in
the boiler.
- High/ low control, (two volt free relays) where the
boiler is controlled by means of a 2-stage controller at
part load and full load.
In all cases, modulation is based on the required flow
temperature and there is a dT dependent output control
with the following characteristic.
Up to a dT of 25° (factory setting, parameter H) the
boiler operates at full output. Between dT
the output reduces in linear fashion (see fig. 19).
load
Supplied By www.heating spares.co Tel. 0161 620 6677
fig. 19
pdf
and dT
full load part
28
Remeha Gas 310 ECO
Output control characteristic