Greenheck Temperature Control Package v2.0 (461468) - Manual (Page 2)

2
1. Outdoor air sensor detects high enthalpy and
activates summer operation mode.
2. The energy wheel cools and dehumidifies the
outdoor air.
No Room Thermostat or Humidistat
3a. After-coil temperature sensor sends signal to
controller to regulate condensing unit stages or
chilled water valve. DX or chilled water will cool air
to the specified after-coil set point.
3b. Sensor detects discharge air temperature (for
reheat). Controller adjusts hot water valve, electric
heat, or indirect fired furnace stages to meet the
summer heat setting.
Room Thermostat only
3a. When the room temperature set point is met, the
DX or chilled water coil will cool air to the specified
after-coil set point. If the unit is equipped with
reheat, the air will be reheated to the specified
summer heat setting.
3b. When the room temperature is above the summer
set point, the after-coil temperature will drop to
the specified after-coil override setting and the
discharge temperature will drop to the summer
heat override setting (i.e. turn the heater off) .
Room Humidistat only
3a. When the humidity set point is satisfied, the DX or
chilled water coil will cool air to the specified after-
coil set point. If the unit is equipped with reheat,
the air will be reheated to the specified summer
heat setting.
3b. When the humidity in the space is too high, the DX
or chilled water coil will drop to the specified after-
coil override setting with no change in reheat.
Room Thermostat and Humidistat
3a. When the room temperature and humidity set
points are satisfied, the DX or chilled water coil
will cool air to the specified after-coil set point.
If the unit is equipped with reheat, the air will be
reheated to the specified summer heat setting.
3b. If the temperature is met, but the humidity is high,
the after-coil temperature will drop to the specified
after-coil override setting with no change in reheat.
3c. If the temperature is high (regardless of the
humidity conditions in the space), the after-coil
temperature will drop to the specified after-coil
setting and the discharge temperature will drop
to the summer heat override setting (i.e. turn the
heater off).
1. Sensor detects that the outdoor air enthalpy
has fallen below the summer/winter changeover
enthalpy and activates winter operation mode
which disables the unit’s cooling capabilities.
2. The energy wheel heats and humidifies the
outdoor air.
No Room Thermostat
3. Discharge air sensor senses temperature.
Controller adjusts hot water valve, IG furnace, or
electric heat stages to the winter heat setting.
With Thermostat
3a. When room temperature set point is met, the unit
will discharge air at the winter heat setting.
3b. When room temperature is below the set point, the
unit will discharge air at the heat override setting.
Temperature Control Package Description
The Temperature Control Package enables models ERH, ERCH, or ERT to temper outdoor air to desired
temperature and relative humidity. The controller and accompanying sensors are mounted in the unit, wired,
and fully programmed at the factory. Default settings are pre-programmed, but are field adjustable. This unit
has been programmed for either discharge or room control. Discharge control will temper the outdoor air to the
desired discharge condition. Room control will temper the outdoor air to meet the desired room air conditions
with the use of a remote thermostat. An optional humidistat is available for tighter control of room humidity
conditions.
Summer Sequence of Operation
Winter Sequence of Operation
Sensor locations
1 4 3 2
2
1
3
4
Outdoor air sensor
(summer/winter changeover)
After-wheel temperature sensor
(energy savings readout, coil freeze protection)
After-coil cooling temperature sensor (on units
with cooling)
Discharge temperature sensor
1
3
4
1
4