Comfort Compact Controller ZG 252N

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1 Comfort Compact Controller ZG 252N OPERATION AND PUTTING INTO SERVICE C ,5 3,5 3,0 2,5 2 1,8 1,6 1,4 A 1,2 1 0,8 0,6 0,4 0 ZG 252 N auto1 B C ,6-20 C P1 C B A P1 C B A 20 CB L1 L2 S P1 C B A

2 // //// System diagram AF TW ZG 252N // VF //// P //// VM ZR CBZG037.cdr ZG Control Unit ZR Heating mixing valve VF Flow sensor VM Servomotor AF Outdoor sensor TW Temperature selector (Option) P Heating circuit pump

3 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 determines the necessary hot water temperature (flow temperature). Theflow sensor (VF) measures the water temperature in the heating flow. It senses also the changes that are caused by the oscillations in the boiler or heating return temperature. If the flow temperature 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 remote control, e.g. if the control unit is mounted in the cellar. The room temperature can be changed with selector knob P2. The party switch S1 makes it possible to increase the night-time decrease in temperature. (The temperature selector is not needed necessarily and is not supplied with the compact control unit.)

4 Operating and Display Components Pos. Function Basic Setting A B 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

5 Operating mode selector manu The control unit is deactivated (the timer runs). The mixing valve can be set manually (by hand). The heting circuit pump is switched on. auto 1 Recommended setting for improved energy saving: Automatic change between day and reduced mode according to the timer, with night switch-off. During night mode, the mixing valve remains closed completely at outside temperatures of more than +2 C and the heating circuit pump is switched off. At outside temperatures below +2 C the pump runs for frost protection and the controller works with the night decrease set on the setting knob C. auto 2 Recommended setting for 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 circuit 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.

6 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.

7 Putting into service Set the timer 6 at the current time. Set the operating mode selector S on auto 1 or auto 2. The switch is in position 2 when it leaves 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 remaining factory settings are printed under 3 on the controller. Timer for reduced mode 6 With the aid of the timer, the temperature of the rooms can be automatically 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 switchon time. Push in the trip pins until they reach the stop.

8 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 switchon time. Push in the trip pins until they reach the stop. Owing to the different lengths, the trip pins must always be inserted in a red/blue alternate order. The red trip pin switches on day mode, while the blue pin activates reduced mode. In order to make sure that the rooms are heated well in the morning, the heating system s day mode should be activated between a half 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. If a (second) decrease in temperature is desired in the course of the day to save energy, the program needs to be extended. Take the extra trip pins 4 and insert them at the desired time. CB cdr

9 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 is prepared ex factory for the day program and, if required, it can be changed to week program (see installation instructions). Setting the right time To set the time, the time dial is to be placed on the trip pins andtur - ned clockwise until the indication on the setting marker 7 matches with the current time.

10 Optimization of the Settings Basic settings for a hot water heating system working at water temperatures between 20 C and 90 C: A 1,6 B 0 C -8 I Day mode curve / II 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 depending 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 building must be assigned an optimal heating curve.

11 The lower the maximum flow temperature at basis of the calculation of the heating system and the more numerous the heating surfaces are, the more level the heating curve can be selected and hence the smaller the numeric value to be set on the setting knob A is. Basic setting: A 1.6 (curve I in the diagram). Displacement (room temperature change) With setting knob B, the heating curve set on the setting knob A can be moved in parallel along the room temperature axis (represented obliquely in the diagram). This displacement leads to a change in the room temperature. Basic setting: B 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 0 corresponds approx. to a room temperature of 20 C B +2 corresponds approx. to a room temperature of 22 C Pay attention also to Remote Control TF 22.

12 Night decrease setting knob C On setting knob C, the size of the night decrease to be triggered by the timer is to be set. The setting on setting knob C leads to a parallel shift of the heating curve downward along the room temperature axis (dotted curve II ). The flow temperature and the room temperature are hence reduced. The scale division on setting knob C corresponds approximately to a K ( C) room temperature decrease. 0 means no decrease. Example: C -8 means that the room temperature at night can drop by approx. 8 K below the set day temperature and hence e.g. to 12 C (20 C 8 C = 12 C). The recommended setting C -8makes it possible to save quite 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 -5) or to switch on day mode earlier.

13 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 room temperature is not measured on the temperature selector). The scale on the selector is divided from-7 to +7 and matches more or less to the change in degrees. + Increasing the Room Temperature 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. S1 P2

14 The values on the selector knob P2 and the setting knob B are added on the control unit: Examples B 0 B +1 Selector knob P Room temperature [ C] If no temperature selector is available, the desired room temperature can be set only on the setting knob B of the control unit.

15 Party switch S1 The temperature selector s party switch has the 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.

16 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 economy mode (the anti-freeze protection is hence active.) At the expiry of the selected time, the TFU 22 resets the control unit back to automatic mode. There is no need to remember to reset the switch. Economy mode (night) is possible only if the time is set. P2

17 Adjustments to the Room Temperature If in case of varying outside temperatures the setting of the TF needs to be changed frequently to obtain a steady room temperature, 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 1.6 B b) too cold only with mild outside temperatures: A B c) too cold only at very cold temperatures: A B 0 2. The room temperature is too high: In the rooms there is... a) too hot at any outside temperature: A 1,6 B 1 2 b) too hot only with mild outside temperatures: A 1.8 B 1 2 c) too hot only at very cold temperatures: A B 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.

18 Pump Demand-responsive mode The control unit can switch on the heating circuit pump on a demand- responsive basis. It is switched on only by the control unit 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 auto 2 / B 0 / C -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 ). The heating circuit pump can hence avoid remaining stuck and blocked also during long periods of idleness (summer).

19 Troubleshooting Checklist Are the heater valves (thermostat valves) turned too far? Is the boiler at the required temperature? Read the boiler thermometer. Is the burner ready? Is the burner failure lamp on? 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 A B C and operating mode selector S Is the timer running? Is the displayed time correct? Check the time and switch-on point. If the problem still has not been solved after checking the 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.

20 Manual mode CB cdr

21 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 desired position. After eliminating the problem, the mixing valve is set again to the right position by the control unit in automatic mode.

22 Heating curves Flow temperature[ C] C A I II CB50427E Room temperature change[ C] 0 B C External temperature[ C] -20 C

23 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 forced drive of the heating circuit pump is not desired 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 Mount the timer again. Regulation Stability (Sensitivity) The stability of the regulation can be modified with the setting potentiometer P1. For the regulation technician: By means of P1, set the proportional range of the PD control unit. Recommended basic setting: P1 10. In case of unstable regulation, set higher values.

24 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 Honeywell AG Böblinger Straße 17 D Schönaich Telefon +49 (70 31) Telefax +49 (70 31) Technical data may be changed without prior notice. EN 2H-0215 GE51 R

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