Use default settings to fulfill most cases. Configure the following three additional functions if required.
Optional function 1#: Overtemperature protection for electric reheater
This AF has a heating coil over-temperature detection input (HclOvrTDet) from a high temperature cut-out switch. When the switch activates, the coil is commanded off at equipment protection priority and a signal is sent to the source of air flow to hold / maintain air flow. A timer prevents the source of air flow from stopping until the timer expires.
- Enable overtemperature detector input (EnOvrTDetIn)
- “EnOvrTDetIn” must be set to 1:Yes to enable the functionality.
- When electric heating coil over-temperature detector is closed, the heating coil device mode will turn Off at priority (4:Protection).
- When heating coil over temperature detector is open, the heating coil device mode will be released to priority (15: Automatic mode).
- Note: The functionality must work together with on-board input Heating coil overtemperature detector.
Optional function 2#: Nominal electric power
The nominal electric power usage of the electric heating coil is provided for energy monitoring and coordination with other devices.
- Stage electric:
- When the coil is on, HclElPwr = NomElPwr. No power is used when coil is off.
- 2-Stage electric:
- When one electric heat coil stage is on, HclElPwr = NomElPwr / 2
- When both stages are on, HclElPwr = NomElPwr
- 3-Stage electric:
- When one electric heat coil stage is on, HclElPwr = NomElPwr / 3
- When two stages are on, HclElPwr = NomElPwr * (2/3)
- When all three stages are on, HclElPwr = NomElPwr
Optional function 3#: Lockout heating coil at high outside air temperature
If users want to lock out the heating coil for energy saving purpose when outside temperature is greater than a defined temperature, enable this function using the following two parameters:
- Enable lockout heating coil at high outside air temperature (EnLockHclTOaHi)
- If “EnLockHclTOaHi” is Yes AND the outside air temperature is greater than “LockHclTOaHi” and is valid, the device mode is set to Off.
- If “EnLockHclTOaHi” is No OR the outside air temperature is less than “LockHclTOaHi” minus “HysTOaLockHcl” OR is invalid, this function has no effect on the device mode.
- Lockout heating coil at high outside air temperature (LockHclTOaHi). See Enable lockout heating coil at high outside air temperature for functionality.
Note: This function must coordinate with central function “Central weather station” in DXR2.x18\PXC4\PXC5\PXC7 serials.