Honeywell MicroniK 200 R7426A Installation & Start-Up Instructions page 9

Table 9. Control point reference and calculation
Application
Main Temperature Control
Limit Control
Cascade Control (Submaster)
Temperature Sequence
1)
Control
Temperature Cascade
(Subm.) Sequence Control
Economizer Modes
Mixed Air Dampers
Energy Recovery System
1)
Control with Heating, Mixed Air Dampers or Energy
Recovery and Cooling
2)
CTRP1 = W1 + XOFFS + CPA + OAT
3)
CTRP2 = W
lim
4)
CTRP2 = W + XOFFS - R
cas
XOFFS = -OFFS for heating control if Dir/RevY1 = Rev
XOFFS = +OFFS for cooling control if Dir/RevY1 = Dir
5)
CTRP1 = W1 + CPA + OAT
6)
CTRPC = W1 + OFFS + CPA + OAT
7)
CTRPH = W1 - OFFS + CPA + OAT
8)
CTRP2 = W - R 0.5 + YMaster
•
cas cas
9) 8)
CTRPC = CTRP2 + OFFS + Xp2
10) 8)
CTRPH = CTRP2 - OFFS - Xp2
For occupied function OFFS = 0.
OAT = Compensation Reset Effect
Comp
Calibration of Temperature Sensors
T1CAL, T2CAL or T3CAL (P.17...P.19)
The controllers include a calibration setting and are factory
calibrated. In case of an offset as a result of long wiring
lengths the temperature sensor inputs (T1, T2 and T3) can
be adjusted separately by the control parameters T1CAL,
T2CAL and T3CAL.
Return Air Offset RetOffs (P.20)
The control parameter RetOffs is available only on
R7426B,C controllers and is used to activate economizer
mode (RetOffs ≠ OFF) for mixed air damper or energy
recovery system control.
If the main temperature sensor (T1) is installed in the exhaust
air the control parameter RetOffs should be set to 0. In
applications with the main sensor installed in the room and
with a constant offset between room and exhaust air
conditions, this offset value can be adjusted within 0...5 K by
the control parameter RetOffs. This will be added to the
actual measured room temperature value to simulate exhaust
air conditions.
The economizer mode is disabled, if the value of the control
parameter RetOffs is programmed to OFF or, if no outdoor
air temperature sensor is connected.
Minimum Position MINPOS (P.14)
The control parameter adjustment MINPOS is available on
R7426B,C controllers only and determines the minimum
CTRP1 CTRP2 CTRPC CTRPH
2)
x
3)
x
4)
x
5) 6)
x x
8) 9)
x x
1)
x
x
Comp
0.5 + YMaster R /100
• •
cas cas
Comp
+ Xp1 0.5
•
Comp
- Xp1 0.5
•
Comp
R /100
•
cas
0.5
•
0.5
•
open position to which an outdoor air damper actuator can be
driven from the controller. In mixed air damper applications it
maintains the minimum outdoor air damper setting, even
though the temperature input condition calls for a fully closed
position.
Minimum position is overridden by the external plant/system
7)
x
ON/OFF input for plant/system shut off and the damper is
driven into the fully closed position at OFF condition together
10)
with the heating and cooling valve actuators.
x
Runtimex, x = Y1, Y2 or Y3 (P.21...P.23)
The control parameters Runtimex (x = Y1, Y2 or Y3) are
available only on R7426A, B controllers.
For three-position floating control of actuators, the controller
converts the deviation signal to a proportional output pulse
which drives the actuators depending on the Runtimex
(x = Y1, Y2 or Y3) parameter value.
An automatic synchronization function ensures correct
positioning of the actuators. The run time for synchronization
is derived by control parameter Runtimex (x = Y1, Y2 or Y3)
multiplied by 1.25.
By selection of the output Y1 or Y3 to pwm mode the pulse
width modulated output is suitable for driving electric heat
current valves and is controlled from the heating signal. The
interval and total cycle time is set by the control parameter
RuntimeY1 or RuntimeY3.
9
R7426A,B.C Temperature Controller
EN1B-0206GE51 R0602