1.800.627.4499
DN-Series Integrated Programmable Controls
DOAS
64
This type requires cooling type CW Mod and heating type DualTempCoil. These type settings
are made here or in the
Control Settings
.
6.5.4.1 Dual Temperature Coil Mode
The mode is determined by the OA temperature and the heating and cooling lockout
temperature settings as well as the BMS command. Both heating or cooling demand drive the
same cooling command analog and cooling enable digital output.
6.5.4.2 Dual Temperature Coil Cooling Operation
This type of cooling modulates a 0–10VDC cooling command output using PI control to maintain
the cooling setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling
enable contact is engaged whenever the cooling demand is at 1% or higher.
TEMPERING CONTROL
6.5.4 Dual Temperature Coil
The dual temperature coil is a coil which provides heating in the winter and cooling in the
summer by changing the temperature of the fluid in the coil. To do this, the coil needs to know
what type of fluid (hot or cold) is being provided. It will lock out cooling in heat mode and vice
versa. The only method for this is a BMS command. Therefore, the system must be equipped
with a BMS system for this control.
The BACnet objects for this are:
u
BV 60 BMS_SetHeatCool: 0 = No, 1 = Yes. This enables the control. This can also be set in
the screen below.
u
BV 61 BMS_HeatCoolMode: 0 = Heat, 1 = Cool. This sets the type. The current setting can
be seen in the screen below for troubleshooting.
The Modbus Registers for this are:
u
Coil 4 BMS_SetHeatCool: 0 = No, 1 = Yes. This enables the control. This can also be set in
the screen below.
u
Coil 5 BMS_HeatCoolMode: 0 = Heat, 1 = Cool. This sets the type. The current setting can
be seen in the screen below for troubleshooting.
