D+H RZN 4503-T Troubleshooting Guide

D+H UK
D+H UK (DH Mechatronic UK Ltd), Unit 10, Lawnhurst Trading Estate, Cheadle Heath, Stockport, Cheshire SK3 0SD Page 2 of 2
www.dh-partner.co.uk | +44 (0)161 491 4840 | Registered in England 02670985 | VAT No. 611329279 V3
Operational faults
Fire alarm interface:
• Conrm signal from interface is normally open volt free.
• 1kΩ triggering resistor and 10kΩ end of line resistor installed as detailed on previous page.
Smoke detector:
• 10kΩ end of line resistor is installed as detailed on previous page.
• Turn smoke detector head clockwise until a click is heard and a physical connection is made between head
and base.
Additional breakglass:
• 10kΩ end of line resistor installed and connections as detailed on previous page.
• Conrm the breakglass terminal connector is rmly secured onto the PCB.
Drive:
• Check MOT terminal connections in the control panel and local connection point.
• Test power supply from terminals a and b in control panel, minimum of 24v DC should be present on
operation (re).
• If voltage is present on operation and connections are correct, the issue is with the drive(s) and not the
controls. See drive instructions for assistance.
DIP-Switches:
• For operational set-up (including one-touch reset of system and activation of integrated ventilation buttons)
see information on reverse of white control panel board.
Natural ventilation operation (optional)
Only operates when DIP-Switch 8 is on. Integrated ventilation buttons:
RZN 4503-T Troubleshooting Guide
Light indicates
vent open
Press to
close vent
Press to
open vent

D+H RZN 4503-T Specifications

General

Brand	D+H
Model	RZN 4503-T
Category	Control Panel
Language	English