Voyager II and III Energy Recovery Modules Operation

Voyager II and III  Energy Recovery Modules Operation

Voyager II and III Energy Recovery Modules Operation and Control Ingersoll Rand 2009 Ph.TISSERAND October 2010 1 Energy Recovery Module installation Easy installation of the two sub-assemblies Rooftop unit is designed to receive Energy Recovery Module (ERM). Rooftop will contain all control equipment : TR1-2800 , Economizer Module (ECA), Connection Terminal, Temperature sensors, defrost pressure switch/timer relay. Rooftop Ingersoll Rand 2009 ERM 2 Energy Recovery Module installation Easy electrical connection into the rooftop Exhaust fan power cables and actuator motor cables prepared Ingersoll Rand 2009 ERM Installation and startup procedure described in document RT-SVX42A

3 Cables connected to terminal block inside the rooftop Voyager II / Voyager III concept Voyager II Mixing between return and fresh air is not managed in the rooftop but in the ERM Return air duct is connected to ERM Voyager III In PHE version, the mixing between return and fresh air is done inside the rooftop. Return air duct is located as the same place as standard rooftop unit. In ERW version, mixing between return air and fresh air is done inside the ERM PHE Exhaust fan treat only exhaust air flow. Exhaust fan is variable speed according to fresh air % Standard : a defrost pressure switch that initiate defrost cycle (bypass of PHE) during a pre-set timer sequence Condensation evacuate via drain pipe. ERW Ingersoll Rand 2009

Exhaust fan treat 100% of the air flow (Return fan). Exhaust fan airflow as to be set at commissioning, but remains fixed speed during operation. No condensate to evacuate, moisture transferred between the 2 airflow. 4 Voyager II PHE 125-155-175-200-250-265-290-340 GDR HTX FRD ROOFTOP EXF BPD MXD FLT ERW 125-155-175-200-250-265-290-340 LVR HTX FLT ROOFTOP Ingersoll Rand 2009 MXD

EXF GDR 5 Voyager III PHE 275-300-350-400-500-600 GDR ROOFTOP BPD HTX EXF FLT ERW 275-300-350-400-500-600 ROOFTOP HTX LVR FLT MXD Ingersoll Rand 2009 EXF GDR 6 Legend FRD

MXD GDR Modulating Fresh air damper Modulating Mixed air damper With 0-10VDC / 24VAC actuator Gravity exhaust damper HTX Heat recovery exchanger BPD By-pass damper With 24VAC ON/OFF actuator EXF Exhaust fan Mixed air flow FLT Fresh air flow EU3 Air filter Ingersoll Rand 2009 LVR Fresh air weather louver 7

Return air flow Key control components - PHE version Rooftop Supply fan Indoor rooftop supply fan (ON-OFF) VarioTrane TR1-2800 (Speed inverter) Reliatel controller (RTRM-RTOM) Power IN Power OUT Outdoor air T 2-10 VDC input Return air T Mixed air T ECA module (Economizer Control Actuator) 2-10 VDC input Ingersoll Rand 2009 ON-OFF input

By-pass damper actuator (ON in free-cooling mode) 8 Mixing/Fresh air damper actuator (Voyager II only) Defrost pressure switch / timer relay Exhaust fan Key control components - ERW version Indoor rooftop supply fan (ON-OFF) Rooftop Supply fan VarioTrane TR1-2800 (Speed inverter) Reliatel controller (RTRM-RTOM) Power IN Power OUT Outdoor air T Fixed Reference Return air T Mixed air T ECA module (Economizer Control Actuator)

2-10 VDC input Ingersoll Rand 2009 ON-OFF input Heat wheel motor (OFF in free-cooling mode) 9 Mixing damper actuator Return fan Energy Recovery Module operation ERM operation is following the rooftop fan and economizer operation ERM Exhaust fan Unit status Rooftop Supply fan Economizer Fresh air damper Unit Fan THP 03 Unit OFF OFF

OFF 0% Ventilation mode Cooling mode Heating mode Unit ON Min % (PHE) 100% (ERW) ON Min % Unit in free cooling Free cooling 100% ON 100% Ingersoll Rand 2009 Fan AUTO Without cooling / heating demand 10 Ventilation mode Fresh air setting

The minimum fresh air opening is setup through the ECA minimum opening onboard potentiometer (0 to 50%). Minimum opening setting could also be given by Tracker / BCU or LON BMS. CO2 sensor option has to be used to adjust fresh air % according to occupancy. On PHE version, exhaust fan motor minimum frequency has to be adjusted through TR1-2800 parameter Mechanical Cooling - Heating Unit controls cooling and heating stages with the same logic as a unit without Energy recovery option. VarioTrane ECA Example for 20% fresh air setting on PHE Voyager III version 3.6VDC 20% By-pass damper OFF ROOFTOP 20 20 20 Ingersoll Rand 2009 11

100 100 20 80 1 0 0 Defrost pressure switch / timer relay INACTIVE 20 20 Free cooling mode Free cooling initiation If the zone is calling from cooling, if Outdoor air temperature is lower than return air temperature, the free cooling will be enabled. In free cooling operation, the ECA will drive fresh air damper modulating from minimum opening to 100% depending of zone cooling need and mixed air temperature. Energy Recovery control The plate heat exchanger by-pass damper is controlled in open/close position depending of fresh air damper position. In free cooling mode, the by-pass damper will open, causing fresh air to flow beside the plate heat exchanger. So, Fresh air temperature will not modified by the heat exchanger. On PHE version, as fresh air introduction increased, the exhaust fan speed increased up to 100% in order to avoid

building pressurization. ECA Example of 100% free cooling on PHE Voyager III version Defrost pressure switch / timer relay INACTIVE VarioTrane 10VDC 100% By-pass damper ON 10 0 100 12 100 Ingersoll Rand 2009 100 1 0 0 10 0 100

100 ROOFTOP 100 Defrost mode (PHE versions only) Defrost During cold period of winter, entering fresh air is at negative temperature. Condensate water on the exhaust side of the PHE could freeze causing pressure drop to increase. A differential pressure switch will sense the pressure drop on the exhaust air side of the PHE. When threshold set point is reached (Frozen PHE), the pressure switch initiate a 5 minutes timer relay that activates the by-pass damper actuator. In absence of heat exchange, exhaust air flow will melt the ice on the heat exchanger. During defrost cycle , the fresh air flow remains at minimum setting in order to be mixed with return air . Tempered air is introduced in the zone. VarioTrane ECA Example of defrost cycle on PHE Voyager III version Defrost pressure switch / timer relay ACTIVE 3.6VDC 20% By-pass damper ON

ROOFTOP 20 20 20 100 13 20 100 Ingersoll Rand 2009 20 80 1 0 0 Water evacuation 20 Ingersoll Rand 2009 Thank you! 14

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