Honeywell ZG 215N User manual

OPERATION AND PUTTING INTO SERVICE
Comfort Compact Controller ZG 215N
C
CB50266
P1
CBA
20
1476
CB
L1 L2 P1 A
S
5
P1 ACB
ZG215N
-8
4
50
auto
10 12 14 16 18 20 22 24 26 28 30
20 16 12 8 6 4 2 Xp
°C
%
100
90
80
70
60
50
40
30
20
10
0
A
2
4
6
8
10
12
14
16
18
20
20 ...9 0 °C
1,4
2,8
4,2
5,5
7,0
8,2
9,6
10,9
12,4
13,9
8311.7352
B
2
A
3

Hot Water Heating with Room Control
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P
VF
ZG215N
TW
ZR
VM
CBZG117.cdr
ZG Control Unit
VM Servomotor
ZR Heating mixing valve
VF Flow sensor
TW Temperature selector
with room sensor
PHeating circuit pump

Operation as a Heating Control
(Fig. left)
The remote control (TF) is composed of a temperature sensor
and atemperature selector. (If desired also two separated devices
can be used.)
nThe temperature sensor measures the actual room temperature.
nThe desired value for the room temperature is to be set on
the temperature selector.
On the basis of both of these values the control unit calculates the
necessary water temperature (flow temperature). It is measured by
the flow sensor (VF). If the flow temperature differs from the set
value, the control unit adjusts themixing valve (ZR) with the ser-
vomotor (VM) so that the right heat input is provided to the radi-
ators.
Themixing valve determines the flow temperature by mixing the
hot water from the boiler with the colder return water.
Theheating circuit pump (P) provides for the circulation of the
hot water. It is not operated by the control unit.
Thetemperature selector (TF) is used as a remote control, e.g. if
the control unit is mounted in the cellar: by means of the selector
knob P2 the room temperature can be changed. With the party
switch S1 the night economy option can be suspended.

Air-handling system with mixing chamber
ZG Control Unit
VM Servomotor
ZR Heating mixing valve
LF Air duct sensor
TW Temperature selector
FT Frost protection thermo -
//
FT
VM
LF
LF
ZG 215N
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CB2283
TW
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Air-handling system with heating coil
//
FT
VM
LF
LF
ZG 215N
///
CB2286
TW
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//
ZG Control Unit
VM Servomotor
ZR Heating mixing valve
LF Air duct sensor
TW Temperature selector
FT Frost protection thermo -

Operation as an Air-handling Control
(fig. left both)
The operation of the air-handling control is basically the same as
for warm water heating. Instead of the flow temperature, the air
temperature in the supply duct is measured.
The control unit calculates the necessary heat demand and regula-
tes the drive motor so that the desired room temperature is reached.
Depending on the layout of the air-handling system, the drive mo-
tor operates on a different part of the system:
nIn case of a mixing chamber system the blinds for the inco-
ming and outgoing air are set.
nIn case of heating coil control the hot water temperature is
set for air heating.
In both of types of system, the supply of heat is regulated so that the
room temperature set with the temperature selector is maintained.

Operating and Display Components
Pos.Function Basic Setting
A
B
Proportional Range
Operating point setting
4
50
CReduced Mode -8
P1 Sensitivity 5
SOperating mode selector auto
L1 “Hotter” LED (red)
L2 “Colder” LED (green)
1Instructions compartment
2Heating curve diagram
3Basic Settings
4Reserve trip pins
5Inserted trip pins
6Timer (optional)
7Pointer for current time
Settings on the Temperature Selector
P2 Selector knob 0
S1 Party switch auto

Operating mode selector
manu the control unit is deactivated (the timer runs). The mixing
valve can be set manually (by hand). The pump is switched on.
auto Recommended setting for greater energy saving: automatic
change between day and reduced mode according to the timer with
night switch-off.
Manual day mode, timer inactive.
Manual night mode according to the settings on the
setting knobs Bminus C, the timer remains inactive.
LED’s
L1 L2
Both LED’s light up:
“neutral”
– mixing valve stops
only red LED lights up:
“hotter”
– mixing valve opens
only green LED lights up:
“colder”
– mixing valve closes
In the manu settings of the operating mode selector Sthere is no
LED display.

Putting into service
nSet the timer 6with the current time.
nSet the operating mode selector Sto auto .
The remaining basic factory settings are printed under 3on the
control unit.
Timer for reduced mode 6
With the aid of the timer, the room temperature during idle periods
can be reduced automatically to save on 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.
nPull 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 inserted in a red/blue
alternate order. Thered trip pin switches
on day mode, while the blue pin activates
reduced mode.
CB5044.7.cdr

In order to make sure that the rooms are heated well in the morning,
the heating system’s day mode should be activated between 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 capaci-
ty 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 4and insert
them at the desired time.
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 day 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 dialing 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 and
turned clockwise until the indication on the setting marker 7
matches with the current time.

Optimization of the Settings
Basic Setting
(for hot water heating operating with temperature between
20 and 90 °C)
Aè4Bè50 Cè-8
nDuring the regulation procedure open the radiator valves
completely. (Set the thermostat valves at the maximum va-
lue).
nIf in the test room (room where the temperature sensor is
located) radiator valves are installed, these must be left
open always.
nClose all windows and doors.
nProceed gradually by making only small changes.
nWait 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, mixing cham-
ber regulation – and depending on the layout of the heating surfa-
ces various flow or supply temperatures are needed to reach the
right room temperature – and hence also different settings on the
setting knobs.

Proportional range: Setting knob A
To make sure that the control unit maintains the desired room tem-
perature, an operating range (regulation range) is to be given. The
operating range defines the relation between the room temperature
and flow temperature or the setting of the regulating unit. Since
there is always a specific relation (proportion) between the room
and flow temperature in the operating range, it is also called
proportional range Xp. For most 90/70 hot water heating systems,
Aè4is correct as the basic setting.
If with this setting (Aè4) a constant room temperature is obtai -
ned and the mixing valve position remains more or less the same
over a long period of time, no correction is necessary.
If, however, periodic room temperature oscillations occur, becau-
se the mixing valve opens and closes intermittently, a larger pro-
portional range is to be set (e. g. Aè5).
Description of the Operating Diagram
With the setting knob Athe proportional range can be set. The
numeric value set on setting knob Ameans a proportional range in
% (or °C) for an operating range of the actuator of 0 to 100 %. The
smaller the numeric value on the setting knob A, the steeper the
operating characteristic curve of the regulation is. A steep opera-
ting characteristic curve implies that already at a small room tem-
perature oscillation a relatively intense heat convection to the
room occurs.

With large numeric values on the setting knob Athe operating
characteristic curve of the control unit is more level. For a small
deviation in the set room temperature, the supply of heat to the
room is hence changed only slightly and for fine dosing.
All the characteristic curves split in the operating point to indicate
the rotation of the operating characteristic curve when turning the
setting knob A. The illustrated characteristic curves Aè4and
Aè9,5 correspond to the setting values 4and 9.5 on the set-
ting knob A. The operating point (settable with setting knob B)
is to be located for usual heating modes halfway between the lar-
gest required and the least possible heating flow temperature.
Setting knob
A
2468101214161820
Xp100in%2468101214161820
Xp 70 in °C 1.4 2.8 4.2 5.5 7.0 8.2 9.6 10.9 12.4 13.9
Xp 30 in °C 0.6 1.2 1.9 2.4 2.8 3.4 4.0 4.7 5.2 6.0
Xp 20 in °C 0.4 0.8 1.2 1.6 2.0 2.2 2.6 3.2 3.6 4.0
Setting of the operating point: Setting knob B
With setting knob Bthe operating point of the operating charac-
teristic point can be moved. The corresponding scale is planned in
“°C flow temperature” or “% valve position”. Basically, the
operating point is to be moved with setting knob Bto the middle
of the system’s operating range. It is for example 45 °C for a hea-
ting system in which the execution value matches the standard

design value and which at the lowest outdoor temperature requires
a maximum heating water temperature of approx. 70 °C and a mi-
nimum temperature of approx. 20 °C. Experience shows that most
systems are quite oversized. For the usual 70/50 radiator heating
systems, the basic setting Bè45 (instead of 50 °C) is correct.
Night decrease: Setting knob C
On setting knob Cthe size of the reduction to be triggered by the
timer is to be set. The setting of Cgives a parallel shift of the ope-
rating characteristic curve to the left (see dotted curve II). This le-
ads to a decrease in the room temperature. The scale division of C
corresponds to a room temperature decrease of approx. K (°C). “0”
means no decrease.
Example: Cè-8 means that the nighttime room temperature
target value is lower by 8 K compared to the daytime value, so that
the room temperature at night can decrease to approx. 8 K below
the set daytime temperature and hence
e. g. to 12 °C (20 °C -8 K = 12°C).
The recommended setting Cat -8 makes 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
about -5 or to switch on day mode earlier.
Examples with other operating ranges:

n1) Low temperature heating
maximum flow temperature 50 °C,
minimum flow temperature 20 °C,
average operating temperature (50 + 20):2=35°C;
The operating point of the operating characteristic curve is to
be set at 35 °C.
Bè35
Aè5
n2) Ventilation and air conditioning systems:
maximum supply temperature 40 °C
minimum supply temperature 20 °C
average operating temperature (40 + 20):2=30°C
The operating point of the operating characteristic curve
is to be set at 30 °C.
Bè30
Aè10
n3) Mixing chamber:
Valve setting AL 100 %, AL at
valve setting AL 0 %, AL to
Bè50
Aè8
(S1 èK,S2 è1)
When using separated temperature sensors and target va-
lue setting devices (TW 21...23), the function selector on
the back of the control unit S2 is to be set always on 1.
These target value setting devices are gaged in °C.

Remote Control TF 22 (optional)
Setting the Room Temperature
On setting knob P2 the setting of the room temperature can be
fine tuned. The setting without the remote control is always 20 °C.
With the respective remote control another setvalue may be tuned.
The scale on the selector is divided from -7 to +7 and corresponds
more or less to the variation in degrees.
+èIncreasing the Room Temperature
–èLowering the Room Temperature
The values of the selector knob P2 and of the setting knob Bon
the control unit are added to the controllers basic setting of 20 °C.
With the controls TW 21A ... TW 23A it is possible to set other
control temperatures also.
P2
S1

Examples TF 22 TW 23A
Selector knob P2 -1 0+1+22021 2223
Room temp. [°C] 19 20 21 22 20 21 22 23
If no temperature selector is available, the desired room tempera-
ture can be set only on the setting knob Bof the control unit.
Party switch S1
The temperature selector’s party switch has the following settings:
auto automatic change to day mode or 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.

Instructions for the Technician (only!)
Removing the Timer (see also the install. instructions)
Operating steps:
n1. Pull out the instructions case.
n2. Hold the timer by the two white stems and turn to the left
until the connector is released.
n3. Remove the timer.
(To install the timer proceed in the opposite order.)
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 è10.
In case of unstable regulation, set higher values.
Setting potentiometer (for special cases)
nBelow the timer you will find the two potentiometers P6
and P8 (see fig.). After removing the timer these can be set
with a screwdriver. The factory basic setting is correct in
most cases and needs to be reset only in special cases and
only by a technician.

nPotentiomer P6 : Minimum limit
In case of air-handling sys-
tems minimum outside air
rates or mini- mum flow
temperatures are necessa-
ry. P6 deter- mines the
minimum opening of the
setting valves between
0...70 %. For heating sys-
tems mini- mum flow tem-
peratures of 0...70 °C can
be set.
Factory basic setting: P6 è0
nPotentiometer P8 : Feedback balancing
In heating systems without flow sensor (e. g. quantity regulation in
the flow) or in air-handling systems, the control unite works with a
potentiometer feedback of the servomotor. Changes in special
cases, if e. g. with valve actuation the motor’s switch-off point and
the valve’s cut-off point do not match.
Factory basic setting: P8 è0
Changes are to be made only by specialized personnel!
Make sure that:
1. Shifting towards +the closing angle increases
– the regulating unit is closed further
2. Shifting towards –increases the opening angle
– the regulating unit is opened further
P8 P6