Coster DTC 628 User manual

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We reserve the right to make changes without notice
3. DETECTORS & REMOTE CONTROL
No. Description Type Sensing Code Data
element sheet
1 Immersion-type boiler temp. detector SIH 010 NTC 10 kΩ B4 N 140
1 Outside temp. detector SAE 001 NTC 1 kΩ B2 N 120
1 Flue gases temp. detector STF 001 PT 1 kΩ B7 N 165
1 Manual remote control CDB 301 – A –
A 511
06.12.05 LB
TEMPERATURE CONTROLLER
FOR MODULATING BURNERS
DTC 628 Eng.
• Boiler temperature controller with 3-wire modulating control
• Communication systems :
– C-Bus for Telemanagement
– C-Ring for exchange data of common interest between local controllers
• Power supply 230 V~ , DIN rail mounting
1. APPLICATION
DTC 628 controller is designed for temperature control of a boiler with three-wire modulating burner (common -
increase - decrease).
2. FUNCTIONS
The principal functions of DTC 628 are:
• The control of the boiler temperature can be :
– Compensated / Fixed Point :
– Compensated: variable in relation to outside temperature.
Use the desired room temperatures: Normal 1...5; Setback 1-2, Frost Protection.
– Fixed Point: at fixed point.
Use the desired boiler temperatures: Fixed Point 1and Fixed Point 2.
– Zones: variable in relation to temperature requested by controllers of these zones connected in C-Ring.
• Control 3-wire modulating burner (common - increase - decrease).
• On-Off control of boiler shut-off valve
• On-Off control boiler pump or manifold or heating plant..
• Timed programming with seven 24hour and two 7day programmes.
• Programming with dates: 25 annual periods; one special period; heating season.
• Automatic switching British Summer Time (BST)/Greenwich Mean Time (GMT).
• Eco Off function: boiler off when outside temperature exceeds a pre-set value.
• Remote control for changing programme in use.
• Four On-Off inputs for : - 3 general alarms
- 1 alarm for burner lockout with simultaneous total exclusion of the boiler with locked-
out burner (closure shut-off valve and pump idle)
• 1 input measurement flue gases temperature.
• Alarms for short or open detector circuits and defective controller..
• C-Ring connection for local exchange of data with other controllers.
• C-Bus connection for transmitting data to local PCs or remote Telemanagement PC.
• Simulation of operation for testing electrical connections at commissioning.
BUS
CCRING

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5. OVERALL DIMENSIONS 6. FACIA
12
45637 8 9 10 11
4. TECHNICAL DATA
• Electrical
Power supply 230 V ~ ± 10%
Frequency 50 … 60 Hz
Consumption 5 VA
Protection IP40
Radio disturbance VDE0875/0871
Vibration test with 2g (DIN 40 046)
Voltage-free output contacts:
Maximum switched voltage 250 V ~
Maximum switched current 5 (1) A
Construction standards Italian Electrotech. Committee(CEI)
Data storage in memory no limits
• Mechanical
Case DIN 6E module
Mounting on DIN 35 rail
Materials:
Base NYLON
Cover ABS
Ambient temperature:
Operating 0 … 45°C
Storage – 25 … + 60°C
Ambient humidity Class F DIN 40040
Dimensions 105 x 115 x 71.5 mm
Weight 0.6 kg
• Programmes, events & periods
24hour programmes 1…7
Daily events 2…6
7day programmes 0…2
Annual periods 0…25
Special period 1
• Measurement ranges
Outside temperature – 30,0…+ 40,0 °C
Boiler temperature 0.0…99.0 °C
Flue gases temperature 0…510 °C
• Compensated control boiler temperature
Heat emitters : – RADIATORS – FAN COILS – PANELS
Design flow temperature :
Radiators 40.0…70.0…99.0 °C
Fan coils 40.0…80.0…99.0 °C
Panels 20.0…40.0…50.0 °C
Design outside temperature – 30.0…– 5.0…+ 20.0 °C
Correction curve origin 20.0…40.0 °C
Desired programmable room temperatures:
5 NORMAL 0,0…30.0 °C
2 SETBACK 0,0…30.0 °C
FROST PROTECTION 0.0…6.0…30.0 °C
• Control boiler temperature at “Fixed Point”
2 desired FIXED POINT temperatures 0.0…99.0 °C
• Control temperature boiler "zones"
Increase boiler temp. over that
of zones 0,0…5,0…50,0 °C
• Boiler setting data
Burner modulation time 30…75…3,600 s
Burner minimum On time (fixed) 60 s
Burner On-Off differential 0.5…5.0…50.0 °C
Boiler temp. limits
Minimum 1.0…99.0 °C
Maximum 1.0…99.0 °C
Eco Off outside temp: – 30.0…+18.0…+ 40.0 °C
Delay closure shut-off valve 0…30…60 min
• Setting for Telemanagement & alarms (from PC)
Attempted calls for sending alarms 2… 5…200
Interval between calls for sending alarms 2…10…210 min.
Alarms (setting from PC):
Difference boiler temp. (B4) 0.5…5…99 °C
Max. temperature boiler 1…95…99 °C
Max. temp. flue gases 2…500…510 °C
Delay single alarms 2…30…255 min.
1 – Protective cover for electronic components
2 – Base with transformer, relay and terminal blocks
3 – Screws for securing base and cover
4 – DIN rail securing elements
5 – DIN rail release lever
1 – Alphanumeric display
2 – + and – keys
3 – ← and → keys
LEDs :
4 – Increase modulation control
5 – Decrease modulation control
6 – Shut-off valve
7 – On-Off burner
8 – Recycle or plant pump
10 – Burner lockout alarm
11 – Measurements & detectors alarms
12 – Fault Alarm
1
2
3
3
4
5

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7. WIRING DIAGRAMS
A – Automatic remote control for changing program in use
B2 – Outside temp. detector (NTC 1 kΩ ; -30…40 °C)
B4 – Boiler temp. detector (NTC 10 kΩ ; 0…99 °C)
B7 – Flue gases temp. detector (PT 1 kΩ ; 0…500 °C)
bb – Alarm contact lockout burner
E – Burner
E.1 – On-Off control burner
E.3 – 3 wire modulation control burner
F – Series of thermostats, boiler and safety burner
M – Boiler pump or manifold or heating plant
k 1…3 – Switch for signalling alarm or status
Y – Boiler shut-off valve
Yfc – Valve end run (permission On burner)
C-Bus – Transmission of data by Telemanagement
C-Ring – Transmission of data between controllers
8. ELECTRICAL CONNECTIONS
Proceed as follows:
• Separate base from cover
• Mount the base on the DIN rail and check that it is firmly anchored by the securing elements (5.4)
• Carry out the wiring according to the diagram and in compliance with the regulations in force and using:
– 1.5 mm2 cables for power supply and relay control outputs;
– 1 mm2 cables for the detectors and remote control;
– 1 mm2 cables for C-Bus. For length limits see data sheets T 021 and T 022.
• Apply power (230 V~) and check its presence across terminals L and N.
• Remove power, replace cover on base/terminal block and secure it with the four screws supplied (5.3).
You are advised not to insert more than two cables in a single terminal of the controller and, if necessary, to use an
external junction box.
9. SITING CONTROLLER AND DETECTORS
9.1 Controller
The controller must be installed in a dry location that meets the ambiental limits given under TECHNICAL DATA.
If installed in a space classified as “Hazardous” it must be mounted in a cabinet for electrical appliances constructed
according to the regulations in force for the type of danger concerned.
The controller can be mounted on a DIN rail and installed in a standard DIN enclosure
9.2 Boiler temperature detector B4
This detector must be installed in the boiler flow pipe, as close as possible to the boiler output itself
9.3 Outside temperature detector B2
This must be installed outside the building, on the north or north-west side, at least three meters from the ground,
out of direct sunlight and as far as possible from windows, doors, fireplaces and other possible sources of thermal
disturbance.
9.4 Boiler flue gases temperature detector B7
This must be installed on the boiler-chimney metal connecting pipe.

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C R i n g co n n e c t i o n
P R I M A R Y
10.3 Several DTC 628 connected together in C-Ring without Heating/DHW circuit controllers.
One of the DTC 628 must be PRIMARY ; the others must be SECONDARY.
The C-Ring connection serves only for sharing the outside temperature.
Each DTC 628 can determine the temp. of its own boiler by :
– own programming.
– remote control A for changing the program in use.
10. C-RING COMMUNICATION BETWEEN CONTROLLERS (for detailed information see data sheetT 022)
In the serial C-Ring the following signals are transmitted:
– permission to operate as Slave controllers
– value of outside temperature use of a single detector for several controllers
– value of the flow temperature requested by the zone controllers, used by the DTC 628 con-
trollers to regulate the temperature of the boilers.
Only one of the controllers connected in C-Ring can be configured as PRIMARY.
10.1 Not connected in C-Ring.
DTC 628 can determine the temp. of the boiler by using:
– own programming
– remote control A to modify program in use.
10.2 Connected in C-Ring with other Heating/DHW circuit controllers.
DTC 628 can be PRIMARY and can determine the temp. of the boiler using:
– value of flow temp. requested by zone controllers
– own programming
– remote control A to modify program in use.
M6.4
C R i n g c o n n e c t i o n
N O
M6.4
C R i n g c o n n e c t i o n
P R I M A R Y
M6.4
C R i n g c o n n e c t i o n
P R I M A R Y
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
C R i n g co n n e c t i o n
P R I M A R Y
M6.4
C R i n g co n n e c t i o n
S E C O N D A R Y
M6.4
C R i n g co n n e c t i o n
S E C O N D A R Y
M6.4
C R i n g co n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g co n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g co n n e c t i o n
S E C O N D A R Y
Slave controller
or
M6.4

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10.4 Several DTC 628 connected in C-Ring with other Heating/DHW circuit controllers.
One of the DTC 628 must be PRIMARY ; the others must be SECONDARY.
Each DTC 628 can determine the temp. of its own boiler using:
– the value of the flow temp. requested by the zone controllers.
– own programming.
– remote control A for changing program in use.
M6.4
C R i n g c o n n e c t i o n
P R I M A R Y
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
The U terminal of the DTC 628 Secondaries
must not be connected
11.2 Address for Telemanagement
Under Telemanagement, in order for the controllers to be identified by the central PC and/or by the
local PCs, they must be assigned a progressive address number.
The regulators can also be subdivided into groups according to certain common properties (e,g,
same geographical area,).
When Telemanagement is not scheduled leave the address in memory (–).
To cancel the values press + and – keys at the same time.
11.3 Sending alarms
• Send alarms : NO = alarms not sent
YES = alarms transmitted to central PC
• PassWTeleman : NO = password not enabled
YES = password enabled
M6.3
A d d r e s s : –
G r o u p : –
M6.2
S e n d A l a r m s : N O
P a s s W T e l e m a n : N O
11. C-BUS COMMUNICATION FOR TELEMANAGEMENT (for detailed information see data sheet T 021)
Via the C-Bus output DTC 618 can be Telemanaged – two-way data communication with one or more
local PCs and/or the central control computer via the (PSTN) telephone network,
From the PC or PCs you can:
– see and/or modify the data and values set on the display pages of the controller and configuration
data dedicated exclusively to Telemanagement (see “Technical Data”).
– see the operational status of the plant components (pumps, auxiliaries in general)
– acquire the alarms coming from the plant
– read the detector measurements (temperatures: outside, flow, boiler, etc)
11.1 C-Bus electrical connections
C R i n g c o n n e c t i o n
P R I M A R Y C R i n g c o n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g c o n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g c o n n e c t i o n
S E C O N D A R Y
Slave controller
or
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
M6.4

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12. EXAMPLES OF PLANTS
12.1 A modulating boiler with zone without control valve .
12.2 A modulating boiler with zones regulated by controllers not connected in C-Ring.
B2 – Outside temp. detector
B4 – Boiler temp detector
B7 – Flue gases temp. detector
E – Burner
E.1 – On-Off control burner
E.3 – Modulating control burner
F – Boiler thermostats
M – Manifold pump
M1 – DHW storage pump
No.1…n – Zone controllers
12.3 A modulating boiler with zones regulated by controllers connected in C-Ring .
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
M6.1
in the timed programming use the room temperature :
NORMAL 1…5 , SETBACK 1-2 , FROSPROT.
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
M6.1
Compensated control: in the timed programming use the room temp. : NORMAL 1…5 , SETBACK 1-2 , FROSPROT.
To ensure the necessary temp. for the storage of DHW use the CDB 301 (A) remote control operated (5-M)
by the On switch of the storage tank M1 with FIXED POINT 1 temp.
Control A Fixed Point: in the timed programming use the boiler temp. FIXED POINT 1-2.
T y p e o f c o n t r o l
Z O N E S
M6.1
B2 – Outside temp. detector
B4 – Boiler temp. detector
B7 – Flue gases temp. detector
E – Burner
E.1 – On-Off burner control
E.3 – Modulating burner control
F – Boiler thermostats
M – Heating plant pump
A – Automatic remote control CDB 301
B2 – Outside temp. detector
B4 – Boiler temp detector
B7 – Flue gases temp. detector
E – Burner
E.1 – On-Off control burner
E.3 – Modulating control burner
F – Boiler thermostats
M – Manifold pump
M1 – DHW storage pump
No.1…n – Zone controllers
i n c r e a s e T Bo i l e r
f o r z o n e s : x x . x c
M1.12

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12.4 Several modulating boilers with zones regulated by controllers in C-Ring.
A – Automatic remote control CDB 301
B2 – Outside temp. detector
B4 – Boiler temp detector
B7 – Flue gases temp. detector
E – Modulating burner
E.1 – On-Off control burner
E.3 – Modulating control burner
F – Boiler thermostats
M – Boiler recycle pump
Y – Boiler shut-off valve
Yfc – Valve end of run
No.1…n – Zone controllers
T y p e o f c o n t r o l
Z O N E S
M6.1
You can use different temperature increases for each boiler (M1.12) so as to differentiate the load between them.
By using CDB 301 (A) remote control for each boiler you can interlock their operation to external controls or operation zone pumps,
etc.
i n c r e a s e T B o i l e r
f o r z o n e s : x x . x c
M1.12

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▼
▼
Ta = 20 °C
Tmp
Tmmin
Tep
90
Tmmax
80
70
60
50
40
30
20 15 10 5 0 -5 -10 -15 -20 te
Tm
▼
20 ÷ 40 °C
▼
C
Ta –
Ta +
M6.1
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
M6.1
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
M6.1
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
13. OPERATION
DTC 628 is a microprocessor-based digital controller especially suitable for controlling the tempe-
rature of a boiler with modulating burner.
When the plant comprises several modulating boilers in parallel, each DTC 628 controls its own boiler
and related shut-off valve with autonomous timed event programmes and desired temperatures; this
permits flexible management of the boilers to meet plant requirements.
14. CONTROL OF BOILER TEMPERAURE
The control of the boiler temperature, monitored by detector B4, can be :
– COMPENSATED - FIXED POINT : Compensated or Fixed Point: the different control modes
are set by the desired temperatures used in setting the timed programs
(M2.) and in the choice of the program in use (M0.2).
– Compensated : boiler temp. in relation to outside temperature;
use : – Room temp.: NORMAL 1...5,
SETBACK 1-2, FROSTPROT.
– Fixed Point : boiler temp. at fixed value;
use : Boiler temp. : FIXED POINT 1-2.
– ZONES : boiler temp. in relation to temp. requested by zone controllers connected in C-Ring.
14.1 Compensated
Compensated control can be used when:
– the boiler feeds a single heating circuit without it own control valve (see Example Plants
12.1).
– the boiler feeds one or more heating circuits with its own compensated controllers and has
to maintain a “basic” compensated temp. that will satisfy the demand of the controllers (see
Example Plants 12.2 and 12.3).
For Compensated temperature control use:
– Room temp. NORMAL 1…5 set in M1.1…5 ;
– Room temp. SETBACK 1-2 set in M1.6-7 ;
– Room temp. FROSTPROT set in M1.8 ;
The control calculates the desired flow temperature (Tf) in relation to the outside temperature (to)
measured by detector B2 (or coming via C-Ring) and from the heating curve, referred to a desired
room temperature of 20°C, set by means of:
• Type of heat emitters: - RADIATORS; - FAN COILS; - PANELS.
Establishes the slope of the heating curve in relation to the output curve of the heat emitters.
• Outside design temperature (Tod), used for calculating winter heat losses from building.
This depends on the climatic zone in which building situated.
• Design flow temperature (Tfd) , used for sizing the plant.
(eg: radiators = 70°C, fan coils = 80°C, panels = 40 °C)
• The origin of the heating curve (C) (flow temp. =
20 °C with outside temp.= + 20 °C) can be with
adjusted by an increase in the flow temperature
(0…40°C). This may be necessary to avoid
problems due to the reduced heating period
used in the intermediate seasons (mild outside
temperatures).
The value of the desired flow temperature (Tf) depends
on the value of the room temperature (Tr) desired by
the operating mode in use (parallel change +/- of the
curve), Room temp. set in M1.1…8.
14.2 Fixed Point
To have temperature control at Fixed Point use:
– Temp. boiler FIXED POINT 1-2 set in M1.9-10 ;
The controller keeps the temperature constant at the desired value FIXED P 1 or FIXED P 2.
M4.1
H e a t e m i t t e r s
R A D I A T O R S
M4.2
D e s i g n o u t s i d e
t e m p : ± x x . x c
M4.3
D e s i g n f l o w
t e m p : ± x x . x c
M4.4
C u r v e O r i g i n T O 2 0
F l o w T : x x . x c

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14.3 Zones
The zones control can be used when DTC 628 is connected in C-Ring with the controllers of the
zones and accordingly is able to know the maximum temperature requested by these circuits (see
Example of Sites 12.3.4). The controller is able to run automatically according to the requirements
of the zones, without the need for its own timed program.
The value of the flow temp. Tm calculated in relation to the demand from the zones can be increased
to ensure that these circuits always have sufficient heat at their disposal.
14.4 Minimum and maximum limits of flow temperature
The desired flow temp. (Tf) calculated by the Compensated control can be limited by a minimum or
maximum value.
Under Compensated, the minimum limit is valid only for the Normal 1…5 room temp. modes.
– Min : xx c : when the temp. falls below the minimum value the controller switches on the boiler
and, using modulating control, keeps the temp. at the value set and switches it off
when the temp. exceeds by 3°C the minimum value.
On "Compensated" it applies only to the Normal Room 1...5 temperatures.
On "zones" it applies only if the desired plants temp. > 0.
– Max : xx c : when the temp. rises above the maximum value the controller uses modulating
control to keep the temp. at the value set and switches off the boiler when the
increase exceeds the 3°C.
Warning: this control system does not replace security measures required
by law.
14.5 Programme and operating mode
It is possible to programme the boiler control according to consumer requirements:
• Program = program in use :
– 7 DAY 1…2 = with one of the two 7day programmes (M2.9…15) ;
– 24 HOUR1…7 = with one of the seven 24hour programmes(M2.2…7) ;
– NORMAL 1…5 xx.x c = with one of the 5 Compensated Normal room temp. (M1.1…5) ;
– SETBACK 1-2 xx.x c = with one of 2 Compensated Setback room temp. (M1.6-7) ;
– FROSTPROT xx.x c = with Compensated Frostprot room temp. (M1.8) ;
– FIXED POINT 1-2 XX.C = with one of the 2 temp. boiler Fixed Point (M1.9-10) ;
– OFF = always Off.
When in place of programme there appears:
– ZONES = M6.1 is ZONES
– ECO OFF = Eco Off is active
– SUMMER = summer period in use (dates in (date in M2.19).
– HOLIDAY = one of holiday periods in use (M2.17).
– SPECIAL = Special period in use.
– REMOTE NORMAL 1 = remote control A is on "NORMAL 1".
– REMOTE SETBACK 1 = remote control A is on "SETBACK 1".
– REMOTE FLOW 1 = remote control A is on"FLOW 1".
– REMOTE FROSTPROT = remote control A is on "FROSTPROT".
– REMOTEOFF = remote control A is on "OFF".
The operating mode depends on programme set in M0.2 o or by the external controls:
• Mode = operating mode in use :
– Zones = M6.1 is ZONES
– Normal = with one of the 5 Compensated Normal room temp.
– Setback = with one of the 2 Compensated Setback room temp.
– Frostprot = with Compensated Frosprot room temp.
– Fixed point = with one of 2 temp. boiler Fixed Point ;
– Off = boiler switched off by programme.
• Tv xx.x c = value of desired temp.
• Var ± x.x c = variation in desired temp. (room max ±3.0°C, flow max ± 50.0 °C).
14.6 Eco Off function
This function permits switching off the boiler when outside temperature above value set and switching
it on again when it is 2°C below value set.
• Burner Off : – NO : function not enabled ; – YES: function enabled
• Outside T : x,x c : value of outside temp. for switching off boiler.
M6.1
T y p e o f c o n t r o l
Z O N E S
M1.12
I n c r e a s e T B o i l e r
f o r z o n e s : x x . x c
M4.5
F l o w T l i m i t s
M i n : x x c M a x : x x c
M0.2
P r o g r a m :
2 4 H O U R 1
M0.3
M o d e : N O R M AL
T d 2 0 . 0 c V a r ± 0 . 0 c
M1.13
B u r n e r O f f : N O
O u t s i d e T : 3 . 0 c

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15. CONTROLS
The controller is able to control the modulating burner (E), the boiler shut-off valve (Y) if present and
the pump (M) for the boiler, manifold or heating plant.
15.1 Control burner E
To control the burner the controller uses output switches 1-2 and 3-4 for burner modulation and
switch 11-12 for On-Off.
The controller compares the desired temperature (T°d) of the current mode with the temperature
measured by the boiler detector (B4) and produces the PI mode control action in relation to the
temperature deviation and the following parameters:
• Proportional Band: fixed value equal to detector measurement
range
• Integral Time: value fixed at 20 minutes
• Time for modulating actuator to go from minimum to maximum
power. Enables controller to calculate the control times “In-
crease and “Decrease”
• Temperature differential On-Off of modulating burner when it
is at minimum power.
In order to prevent a too rapid increase in desired boiler temperature from triggering the safety ther-
mostats, it is possible to program a maximum gradient for this temperature in C° per minute.
15.2 Control shut-off valve Y
When several boilers use a single manifold it often happens that the boilers are shut off by valves
that allow isolating the unused boilers. DTC 628 can control the shut-off valve by means of SPDT
switch 5-6-7.
• Boiler valve : – MAN : valve is always open (6-7 closed; 5-7 open).
– AUT : the valve is closed (6-7 open; 5-7 closed) in Off mode and with desi-
red temp. zones = 0. It is opened (6-7closed; 5-7 open) in any other
mode.
• Delay Off : xx min : delay in closing valve (after switching off burner) to avoid overheating
of boiler because of residual heat in the combustion chamber.
15.3 Control pump for recycle boiler, manifold or heating plant M
The SPDT switch 8-9-10 can control :
- the boiler recycle pump
- the manifold pump (with several boilers use the switches of the various DTC 628 connected
together in parallel)
- the heating plant pump (Examples plants12.1).
• Pump Summer: NO: pump not used in summer; - YES: pump used in summer.
• Pump use program : – 7DAY 1-2 : set in M2.9…15
– 24HOUR 1...7: set in M2.2…7
– FOLLOWS BOILER : follows program chosen in M0.2
– ALWAYS ON : pump always on
– ALWAYS OFF : pump always off
• Pump Delay Off : – NO : pump switched off without delay.
– YES: pump switched off with delay of 5 minutes.
14.7 CDB 301 automatic remote control
CDB 301 remote control permits changing the controller programming by the closure of external
voltage-free switches. e.g. boiler, with compensated control, which has to operate at higher tempe-
rature because of demand from DHW storage.
The functions are :
– Input CC - M = boiler OFF with priority over all other programming.
– Input 1 - M = not used
– Input 2 - M = boiler controlled on FROSTPROT
– Input 3 - M = boiler controlled on SETBACK 1 room temp.
– Input 4 - M = boiler controlled on NORMAL 1 room temp.
– Input 5 - M = boiler controlled at Fixed Temp. FIXED POINT 1
The input CC-M “OFF” has absolute priority over all the other programs and consequently when CC
is switched to M it does not matter if some other switch is closed.
All the other controls (2…5) are exclusive and two switches cannot be closed at the same time.
With all the switches open the controller programming is operative.
M1.11
P u m p S u m me r : Y E S
F O L L O W S B O I L E R
M5.2
O n - O f f d i f f e r e n t
b u r n e r : x x . x c
M5.1
B u r n e r M o d u l a t i o n
t i m e : x x x s
M4.6
B o i l e r v a l v e : A U T
D e l a y O f f : x x m i n
M4.7
P u m p
D e l a y O f f : N O
M1.14
S p e e d I n c r e a s e
D e s B o l T : 9 9 . 0 c / m