Specifications

14
RG SERIES ENGINEERING GUIDE
Inside the RG Series cont.
Water-to-Refrigerant Coaxial Heat Exchanger Coil
Large oversized coaxial refrigerant to water heat
exchangers provide unparalleled
efficiency. The coaxes are designed
for low pressure drop and low flow
rates. All coaxes are pressure rated
to 450 psi water side and 600 psi
on the refrigerant side. Optional
ThermaShield coating is available on
the water-to-refrigerant heat exchanger
to prevent condensation in low
temperature loop operation.
Service Connections
and Serviceability
Two Schrader service ports are provided
in every unit. The suction side and
discharge side ports are for field charging
and servicing access. All valves are
7/16 in. SAE connections. All water and
electrical connections are made from the
front of the unit. Unit is designed for front
access serviceability.
4-Way Reversing Valve
Z units feature a reliable all-brass pilot
operated refrigerant reversing valve.
The reversing valve operation is limited
to change of mode by the control to
enhance reliability.
NEW!: All-Aluminum Air Coil
Beginning in Fall of 2013, all models in the
RG line began shipping with all-aluminum
air coils. These air coils are constructed of
lanced fin and rifled tube aluminum that is
not susceptible to formicary corrosion. For
additional condensate runoff and meeting
project specifications, an optional AlumiSeal
e-coating is available.
Blower Motor and Housing
High efficiency low rpm galvanized direct drive blower featuring
3 speed permanently split capacitor (PSC) motor, 5-speed ECM
motor, and optional variable speed ECM blower motor. The variable
speed ECM motor is controlled directly through the unit's Aurora
Base Control. The lower rpm blower also reduces air noise. All PSC
and 5-speed ECM motors have speed selection terminal strip on
the motor for easy speed change. All motors are vibration isolated
to reduce noise. High static options are available in some models
for both PSC and variable speed ECM motor versions. Horizontal
units can be field converted from end to side discharge as well.
NOTE: 460V 5-speed ECM blower motor does not require a
neutral wire.
5-Speed ECM Constant Torque Motors
The 5-speed ECM is a ‘Constant Torque’ ECM motor and delivers air
flow similar to a PSC but operates as efficiently as a variable speed
ECM motor. Because it’s an ECM motor, the 5-speed ECM can
ramp slowly up or down like the variable speed ECM motor. There
are 5 possible speed taps available on the 5-speed ECM motor with
#1 being the lowest airflow and #5 being the highest airflow. These
speed selections are preset at the time of manufacture and are
easily changed in the field if necessary.
5-Speed ECM Benefits:
- High efficiency
- Soft start
- 5 speeds with up to 4 speeds on-line
- Built in logic allows air flow to change with G, Y1, Y2
and W signals
- Super efficient low airflow continuous blower setting (G)
GeoStart
TM
The optional GeoStart single phase
soft starter will reduce the normal
start current (LRA) by 60%. This
allows the heat pump to go off-grid.
Using GeoStart also provides a
substantial reduction in light flicker,
reduces start-up noise, and improves
the compressor's start behavior.
GeoStart is available in a field retrofit kit or as a factory installed
option for all RG Series units.
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