Honeywell ZG 252N OPERATION AND PUTTING INTO SERVICE

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Comfort Compact Controller ZG 252N

OPERATION AND PUTTING INTO SERVICE

142 376

4,5 3,5 3,0 2,5

ZG252 N

auto1

°C

100

+10

-8

-8 1,60

P1 ACB

2 1,8 1,6 1,4

1,2 1 0,8 0,6 0,4

-20°C+5 -10 -15-50

8311.7151

L1 L2 P1

CBA

CB5025.7

System diagram

ZG252N

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ZG Control Unit VF Flow sensor

AF Outdoor sensor TW Temperature selector (Option)

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ZR Heating mixing valve VM Servomotor

P Heating circuit pump

CBZG037.cdr

Operating of the Control

(see figure on the left)

The outdoor sensor (AF) measures the outside temperature. It transmits its measured value to the control unit, which determi

nes the necessary hot water temperature (flow temperature). Theflow sensor (VF) measures the water temperature in the hea

ting flow. Itsenses also the changes that are caused by the oscilla tions inthe boiler orheating return temperature.If the flowtempe

rature differs from the target value, the control unit adjusts the mixing valve (ZR) with the servomotor (VM) so that the right

heat input can be reached.

Themixing valve determines the flow temperature by mixing the boiler’s hot water with the colder return water.

Theheating circuit pump (P) provides for the heating circuit of the hot water. It is switched off by the control unit, if the heating

circuit is necessary. Thetemperature selector(TW) is used as a remotecontrol, e.g. if

the controlunit is mountedin the cellar.The room temperaturecan be changed with selector knob P2 . The party switch S1 makes

it possibleto increase thenight-time decrease intemperature. (The temperature selector is not needed necessarily and is not supplied

with the compact control unit.)

Operating and Display Components

Pos. Function Basic Setting

Heating curve diagram

Parallel shift

C Reduced mode -8 P1 Sensitivity 10 S Operating mode selector auto 1 L1 “Hotter” LED (red) L2 “Colder” LED (green) 1 Instructions compartment 2 Heating curve diagram 3 Basic settings 4 Reserve Trip Pins 5 Inserted trip pins 6 Timer (optional) 7 Pointer for the current time

Settings on the temperature selector

P2 Selector knob 0 S1 Party switch auto

-1.6 0

Operating mode selector

manu The control unit is deactivated (the timer runs).

The mixingvalve can be set manually(by hand). The heting circuit pump is switched on.

auto 1 Recommended setting forimproved energy saving: Auto

matic change between day and reduced mode according to the ti mer, with night switch-off. During night mode, the mixing valve

remains closed completely at outside temperatures of more than +2 °C andthe heating circuit pump isswitched off. At outside tem

peratures below +2 °C the pump runs for frost protection and the controller works withthe nightdecreaseset on the setting knob C.

auto 2 Recommended settingfor automatic change between day

and reduced mode according to the timer. The decrease set on the setting knob C is active.

2 The mixing valve is kept closed constantly and the heating cir

cuit pump is switched off. The timer runs.

Energy saving tip: A particularly great energy savings can be made if the switch position auto 1

is selected. In this switch position it may happen that the heating lasts longer.

LED’s

L1 L2

Both LED’s light up: “neutral” – Mixing valve stops

Only the red LED lights up: “hotter” – Mixing valve opens

Only the green LED lights up: “colder” – Mixing valve closes

In the manu or 2 settings of the operating mode selector S there is no LED display.

Putting into service

Set the timer 6 at the current time.

Set the operating mode selector S on auto 1 or auto 2 .

The switchis in position 2 when itleaves the factory.The pump is hence switched off and is protected against the dry-running of the

empty heating system.

Warning: In switch position 2 the 230V line voltage is between terminals 8 and 11 of the control unit!

(The servo motor closes).

The remainingfactory settings are printed under 3 on the control ler.

Timer for reduced mode 6

With theaid of the timer,the temperature ofthe rooms can beauto matically reduced when they are not used to save on the operating

costs. The timer has a built-in power reserve of approx. 60 hours thanks

to a rechargeable battery.

Changing the program

Factory settings: red pin 6:00, blue pin 22:00.

Pull out the trip pin and insert it again at the desired switch-

on time. Push in the trip pins until they reach the stop.

Owing to the different lengths, the trip pins must always be inser ted in a red/blue alternate order. Thered trip pin switches on day

mode, while the blue pin activates reduced mode. In order tomake surethat the rooms are heated well inthe morning,

the heating system’sday mode should be activated between ahalf an hour and an hour before using the rooms.

Energy saving tip: Reduced mode can be activated up to an hour before the room is left. The storage

capacity of the heating system and building is enough to keep the rooms warm for some time.

Timer with day program

The day program is repeated every 24 hours. Ifa (second) decrease intempera

ture is desired in the course ofthe dayto save energy, the program needs to be

extended. Takethe extra trippins 4 and insert them at the desired time.

CB5044.7.cdr

Example:

Desired time program Normal temperature: 6:00 h to 8:00 h and 16:00 h to 22:00 h

Night decrease: 22:00 h to 6:00 h day decrease: 8:00 h to 16:00 h

Position of the trip pins

red pin 6:00 h – Start day mode (normal temperature)

blue pin 8 :00 h – Start daily decrease

red pin 16:00 h – Start day mode (normal temperature)

blue pin 22:00 h – Start night decrease

Timer with week program

The timer has a changeable dial. With the week program, dialling a different heating program for

each weekday is possible. The dial isprepared exfactory for the day program and,if required,

it can bechanged toweekprogram (see installation instructions).

Setting the right time

To setthe time, the timedial is to beplaced on the trippins andtur

ned clockwise until the indication on the setting marker 7 mat

ches with the current time.

Optimization of the Settings

Basic settings fora hot water heating systemworking at water tem peratures between 20 °C and 90 °C:

A è 1,6 B è 0 C è -8

I è Day mode curve / II è Reduced mode curve

During the optimization, the radiator valves are completely

open. (Set the radiator thermostat valves at the maximum value) Close all windows and doors.

Proceed gradually by making only small changes! Wait for the outcome of the change after each

setting (approx. 1 h).

Depending on the type of system – radiator/convector heating (up to 90 °C), low temperature heating, air heating, – and depen

ding on the layout of the heating surfaces, various flow or supply temperatures are needed to reach the right room temperature and

hence also different settings on the setting knobs.

Heating curve selection (Setting knob A )

The adaptation of the controller to the heating system and to the building characteristics of the house is carried out by setting the heating curve with the setting knob A . The heating curves show

the relation between the outside temperature and the necessary flow temperature. Each buildingmust be assigned an optimalhea

ting curve.

The lowerthe maximum flowtemperature at basisof the calculati on ofthe heating system and themore numerous the heating surfa

ces are, the morelevel the heating curve canbe selectedand hence the smaller thenumeric valuetobe set on the setting knob A is.

Basic setting: A è 1.6 (curve I in the diagram).

Displacement (room temperature change)

With settingknob B , theheating curve seton the settingknob A can be moved in parallel along the room temperature axis (repre

sented obliquely in the diagram). This displacement leads to a change in the room temperature.

Basic setting: B è 0 The scale division on setting knob B corresponds approximately

to the change in the room temperature in K (°C).

+ means “increase the room temperature” – means “lower the room temperature”

B è 0 corresponds approx. to a room temperature of 20 °C B è +2 corresponds approx. to a room temperature of 22 °C

Pay attention also to “Remote Control TF 22”.

Night decrease setting knob C

On setting knob C , the size ofthe nightdecrease to be triggered by the timer is to be set.The settingon setting knob C leads to apar

allel shift of theheating curve downward along the room tempera ture axis (dotted curve II ). The flow temperature and the room

temperature arehence reduced. Thescale division onsetting knob

C corresponds approximately to a °K (°C) room temperature de

crease. 0 means no decrease.

Example:

C è -8 means that the room temperatureat night can drop by ap

prox. 8 K below the set day temperature and hence e.g. to 12 °C (20 °C - 8 °C = 12 °C).

The recommendedsetting C è -8 makes itpossible to savequite a lot of energy with a large nighttime decrease. In some buildings

the rooms may become too cold. In these cases it is recommended to set a night decrease value of

only about 5 °C ( C è -5 ) or to switch on day mode earlier.

Remote control TF 22 (optional)

Setting the Room Temperature

On setting knob P2 , the setting of the room temperature can be fine-tuned.

The normal setting is the room temperature set on the control unit (setting knob B ) (mainly 20 °C to 22 °C,the roomtemperature is

not measured on the temperatureselector). The scale on the selec tor is divided from-7 to +7 and matchesmore or less to thechange

in degrees.

+ è Increasing the Room Temperature – è Lowering the Room Temperature

The functioning of the selector knob P2 corresponds to the functioning of the setting knob B on the control unit and gives a

parallel displacement of the heating curve along the oblique room temperature axis indicated in the diagram.

The valueson the selector knob P2 and the settingknob B are ad ded on the control unit:

Examples

Selector knob P2 −1 0 +1 +2 −1 0 +1 +2

Room temperature [°C]

If no temperature selector is available, the desired room tempera ture can be set only on the setting knob B of the control unit.

B è 0 B è +1

19 20 21 22 20 21 22 23

Party switch S1

The temperature selector’sparty switchhasthe following settings:

auto automatic change to day mode or

to reduced mode according to the timer

manual day mode, timer not active

manual night mode, timer not active (the “night” duration mode is possible only if the

hours are set.)

If, for example, the heating is to stay open longer, the Partyswitch is to be set on manual day mode.

Do not forget to switch back if the automatic mode is to be activated again later on.

Remote control TFU 22 (optional)

When using remote control TFU 22 (instead of TF 22), a time can be pre-set (e. g. 10 days) during which the heating system is to

work in economymode (theanti-freezeprotection is hence active.) At the expiry of the selected time, the TFU 22 resets the control

unit backto automatic mode. There isno need to remember toreset the switch. Economy mode (night) is possible only if the time is

set.

Adjustments to the Room Temperature

If in case of varying outside temperatures the setting of the TF needs tobe changed frequentlyto obtain asteady room temperatu

re, modify the control unit’s setting as follows:

1. The room temperature is too low:

In the rooms it is... a) too cold at any outside temperature:

A è 1.6 B è +1 … +2

b) too cold only with mild outside temperatures:

A è 1.2 … 1.4 B è +1 … +2

c) too cold only at very cold temperatures:

A è 1.8 … 1.9 B è 0

2. The room temperature is too high:

In the rooms there is... a) too hot at any outside temperature:

A è 1,6 B è −1…-2

b) too hot only with mild outside temperatures:

A è 1.8 B è -1…- 2

c) too hot only at very cold temperatures:

A è 1.2 ... 1.4 B è 0

Tendency of correction

A no corr. B increase

A decrease B increase

A increase B no corr.

A no corr. B decrease

A increase B decrease

A decrease B no corr.

Pump

Demand-responsive mode

The control unit can switch on the heating circuit pump on a de mand- responsivebasis. It isswitched on onlyby the controlunit if

a heat input is needed, i. e. if the target value of the heating flow temperature is higher that the target value of the room temperatur

(pump logic).

In case of the frequently usual setting of the control unit

S è auto 2 / B è 0 / C è -8

the heating circuit pump is switched off:

in day mode at outside temperatures over 20 °C

in reduced mode at outside temperatures below 12 °C

In position auto 1 of the operating mode selector, the switch-off times of the pump are longer.

Blocking protection

The timer is equipped at the factory so that the heating circuit pump runs for about a minute every day, even if no heating is

necessary (Requirement: the operating mode selector S is on

auto 1 or auto 2 ). Theheating circuit pump can hence avoidre

maining stuck and blocked also during long periods of idleness (summer).

Troubleshooting Checklist

Are the heater valves (thermostat valves) turned too far?

Is the boiler at the required temperature?

è Read the boiler thermometer.

Is the burner ready?

Is the burner failure lamp on?

è If necessary, press the reset button.

Was the temperature selector set by mistake?

Check the setting of the selector knob P2 or of the Party switch S1 .

Check the setting on the control unit Setting knobs

AB Cand operating mode selector S

Is the timer running? Is the displayed time correct?

è Check the time and switch-on point.

If the problem still has not been solved after checkingthe settings, position the setting knob B on +7

The servomotor should now open the mixing valve and the red LED L2 should light up. If this is not the case, the control system

has failed. Contact your heating technician.

Manual mode

CB5043.7.cdr

Manual mode (left-hand fig.)

In case of the breakdown of the heating mode regulation you can proceed temporarily as follows:

1. Set the operating mode selector S on manu .

2. Open the mixing valve by hand until the desired flow and

room temperatures are reached.

– The coupling incorporated in the mixing valve drive unit

provides for the release of the connection between the motor and the mixing valve.

– Press firmly on the unlock key on the cover of the drive

unit and keep the key pressed (firmly!).

– Use the setting lever to set the mixing valve to the desi

red position.

After eliminating the problem, the mixing valve is set again to the right position by the control unit in

automatic mode.

Heating curves

°C

100

Flow temperature[°C]

+10

Room temperature

change[°C]

4.5 3.5 3.0 2.5

+10

-8

External temperature [°C]

CB50427E

1.8

1.6

1.4

1.2

0.8

0.6

0.4

-20°C+5 -10 -15-50

Instructions for the technician (only!)

Removing the Timer (see also the installation instructions)

1. Pull out the instructions case.

2. Hold the timer by the two white stems and turn to the left

until the connector is released.

3. Remove the timer.

(To install the timer, proceed in the opposite order.)

Pump activation

If the temporary forceddrive ofthe heating circuit pump isnot de sired while the heating system is idle, one of the jumpers on the

back of the timer is to be removed.

1. Remove the timer.

2. Remove jumper 55.

3. Mount the timer again.

Regulation Stability (Sensitivity)

The stability of the regulation canbe modified with the setting po tentiometer P1 .

For the regulation technician: By means of P1 , set the proportional range of the PD control

unit. Recommended basic setting: P1 è 10. In case of unstable regulation, set higher values.

Reference

Installation instructions Compact Control Units ZG 215N / 215 VN / 252 N

GE 1H-0181 GE51

Operating Instructions ZG 252N: EN-2H0215 GE51

ZG 215N: EN-2H0216 GE51 ZG 215VN: EN-2H0217 GE51

“Informationsschrift”(Planning broschure in German) L3 – Komfort-Compact Regler

GE-0H 0327 GE51

Centra Regelungstechnik http://www.honeywell.de/hga Honeywell AG

Böblinger Straße 17 D 71101 Schönaich

Telefon +49 (70 31) 637-01 Telefax +49 (70 31) 637-493

Technical data may be changed without prior notice.

EN 2H-0215 GE51 R1001 7157 561

Honeywell ZG 252N OPERATION AND PUTTING INTO SERVICE

Specifications and Main Features

Frequently Asked Questions

User Manual