MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
15 EN1Z-1076GE51 R0722
INPUT / OUTPUT WIRING
Wiring Requirements
NOTE:
When attaching two or more wires to the same terminal, other than 14 AWG (2.0 mm2), be sure to twist them
together. Deviation from this rule can result in improper electrical contact, see Fig. 15 below.
Each terminal can accommodate the following gauge of wire:
•
Single wire: From 22 AWG (0.3 mm2) to 18 AWG (1 mm2) solid or stranded
• Multiple wires: Up to two 18 AWG (1 mm2) stranded, with 1/4 watt wire-wound resistor
— Prepare wiring for the terminal blocks, as follows:
— Strip 1/2 in. (13 mm) insulation from the conductor.
— Cut a single wire to 3/16 in. (5 mm). Insert the wire in the required terminal location and tighten the screw.
— If two or more wires are being inserted into one terminal location, twist the wires together a minimum of three turns
before inserting them, see Fig. 15 below.
— Cut the twisted end of the wires to 3/16 in. (5 mm) before inserting them into the terminal and tightening the screw.
— Pull on each wire in all terminals to check for good mechanical connection.
NOTE:
Do not over-tighten the terminal screws to avoid deformation and damage of the terminal block. The maximum torque
for the terminal screws 4.4 lb.-in. (0.5 Nm).
Fig. 15. Attaching two or more wires at terminal block
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