Honeywell R7426C, R7426B, R7426A dimensions Wiring, Power Supply and Grounding, Terminal

R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK

WIRING

Screwless type, spring loaded terminals are provided on the controllers for panel and field wiring. These terminals are suitable for solid conductors as well as tinned or with multicore cable end, stranded wires up to 1.5 mm2. To make a termination, push the wire into the terminal or insert a small screwdriver from the front of the controller into the spring-release hole and insert the wire. Check for proper connection by short pull on the wire.

Table 1. Terminal Connection

controller to CPA/SPA potentiometer

	T7412B1016	T7412B1057/1008	T7412B1024
R7426A,B,C
		T7412C1030/1006	T7412B1040
terminal 2	terminal 4	terminal 4	terminal 4
terminal 4	terminal 5	terminal 6	terminal 5+6
R7426A,B,C	43193982-001	-	-
terminal 2	terminal 1	-	-
terminal 4	terminal 3	-	-

Table 2. Wire Dimensions

wiring run	type of	length max.
	wires	1.0 mm2	1.5 mm2
from controller to all	local	100 m	150 m
input and output	standard
devices

W303

Fig. 2. Parallel Connection of Compensation Sensor T3

	Table 3. Jumper States
jumper1)	state	description
W303	closed	T3 supplied by this controller
	open	T3 supplied from another
		controller

1)Default jumper position = closed. Cut (open) jumper W303 only if the T3 input is fed from another controller (parallel connection, max. six devices). This disconnects the T3 input from the internal power supply

Wiring should be done only according to the actual job wiring diagrams or wiring diagrams shown in the mounting instruction sheet EN1B-0202GE51. The wiring to the CPA/SPA potentiometers is described in Table 1. All wiring must conform to applicable codes, ordinances, and regulations. The maximum allowed wiring length per wire size are shown in Table 2.

POWER SUPPLY AND GROUNDING

1.Refer to job drawings and verify correct supply voltage to transformer (230 Vac) and controller (24 Vac).

2.Connect line power conductors to transformer primary. Line power must be supplied from a breaker panel with dedicated controller circuit. Do not turn the line power on until all wiring has been checked against job drawings.

3.Connect transformers 24 Vac secondary to the controller terminals 18 and 19. Connect one conductor to terminal marked 24 V∼ and the other to terminal marked 24 V⊥. If controllers are interconnected all terminals 19 must be connected to the same potential 24 V⊥ level.

4.Do not connect the secondary side of the transformer to the installation ground.

EN1B-0203GE51 R0507C 2