Dantherm HAC 1 Service Manual

Also see for HAC 1: Service manual

Contents

Dantherm HAC 1 Service Manual Manual pdf 17 page image

17Connecting external accessories: Alternating inputsenAlternating inputsIn case fire protection system is desired it is possible to connect fire thermostat(s) to thesystem on terminal J2. It can be recommended in combination with damper solutions. (seesection damper control)The Fire thermostat is fitted with a jumper wire from factory. The +24VDC from J1 (damper24VDC input) is routed through this jumper, and direct to damper 1 output (spring returnTF24). This ensures immediate damper shut down, if fire burns down the HAC controller.Fire alarms are signalled to the ventilation unit that shuts down as well, and can only be resetby re-booting the ventilation unit. No user interaction applies.Connect with a NO (normally open) relay as shown. Power on the relay coil makes the relayactive, and no fire input. If this circuit is broken due to fire OR smoke detector removes thepower from the coil, the input will disconnect, and in any case close the dampers, and stopthe unitThe fire thermostat carries a maximum of 24V DC / 300 mA.Pre-heat/coolAfterheaterAlarmInputCO₂AuxAftercoolerJ6J11J7J8J9J10J12J13Power In24VDC24VDC24VDC12VUSB FailOKStatusElec.0V0VD+D-TFireTherm+ - + -Input Damper 1OpenOpenDamper 2 ModBus1+ 2+ +16VStandbySwitchHygro-statFailAlarmFilterAlarm+12VSDASCL0 - 10V0 V0 V0 VJ1 J2 J3 J4 J5A1A212A1A2132Coil driverFig. 13The unit can be set to standby mode using closed contact on J8. The unit will stay in standbymode until the contact is open again.CAUTION: It is only allowed to stop the ventilation unit for 4 hours, unless dampers areinstalled to avoid drafting air which can cause condense problems and cold draft issues. Thesupplier cannot be held responsible for any unwanted usage of this input.The input will sink a maximum of 12V DC/ 1 mAConnection:• Connect a potential free normally open (NO) switch to connector J8, between pin 3 andpin 4.• When the switch is active, the ventilation unit is stopped.• When the switch is released, the ventilation unit resumes previous operation.No user interaction appliesAlternative connect an OC output circuit (Open Collector) that can sink minimum 1 mAFire thermostatStandby switch