Honeywell R7426B Product Data page 9

2-STAGE ON/OFF SEQUENCE CONTROL
The R7426A,B controllers convert the output signal into a
2-stage On/Off sequence output signal suitable for operating
relays. Two relays can be connected to provide sequence
control of two stages (such as electric heat stages).
Parameter setting for Output Switching Position:
• OMode is 0, 1, 2, 3 or 4 (R7426B only).
• OxMode (where x is 1, 2 or 3) is 1.
Fig. 12. 2-stage on/off sequence control.
3-STAGE BINARY ON/OFF SEQUENCE CONTROL
The R7426A,B controllers convert the heating signal into a
3-stage binary On/Off sequence.
Parameter setting for Output Switching Position:
• OMode is 0, 1, 2, 3 or 4 (R7426B only).
• OxMode (where x is 1 or 3) is 2.
Fig. 13. 3-stage binary on/off sequence control.
Table 7. Output Operation and Wiring Connection for
Stage On/Off Sequence Control.
R7426A R7426B
2-stage (Omode = 0) stage
N/A Step1 Step1 Step1
Heat
Step2 Step2 Step2
Step1
a
Cool
Step2
Step1 Damper or Step3 Step5
Energy
Step2 Step4 Step6
Recovery
a
Two-stage or floating.
4- 6- Output
stage (24V) Terminals
OUT1 27,28
O3
OUT2 26,27
Step3 OUT1 24,25
O2
Step4 OUT2 23,24
OUT1 21,22
O1
OUT2 20,21
R7426A,B,C TEMPERATURE CONTROLLER
NOTE: Same connection for 3-stage binary control as for
2-stage control on R7426A and R7426B used for
electric heating control (output O3).
Outputs for R7426B only
4-STAGE ON/OFF ELECTRIC HEATING OR COOLING
When OMode is 2, the output sequence of O3/O1 is controlled
from the heating signal and O2 is controlled from the cooling
signal. When OMode is 3 the output sequence of O3/O1 is
controlled from the cooling signal and O2 is controlled from
the heating signal.
NOTES:
— Mixed air damper operation is not available.
— Output O2 operates in accordance with O2Mode.
— O1Mode and O3Mode are 4.
Fig. 14. 4-stage on/off electric heating or cooling.
6-STAGE ON/OFF SEQUENCE CONTROL HEATING OR COOLING
When OMode is 1, and O1Mode, O2Mode and O3Mode are 4
the output sequence of O3/O2/O1 is controlled from one
output signal (See Main Temperature Control or R7426A
Cascade Control.). Cooling or heating action is selected by
the configuration parameter O1CTRF.
Fig. 15. 6-stage on/off sequence control heating or cooling.
15-STAGE BINARY ON/OFF ELECTRIC HEATING AND COOLING
When OMode is 5 the output sequence of O3/O1 is controlled
from the heating signal. The output sequence of O2 is
controlled from the cooling signal. O2 output is operated in
accordance with O2Mode.
NOTE: The mixed air damper operation is not available.
9 63-2564—1