Honeywell ZG 252N OPERATION AND PUTTING INTO SERVICE

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

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