36
ADDITIONAL SUPPLEMENTARY FEATURES OF THE J+ CONTROL
The J+ control has 3 inputs that can be used to interface with supplemental equipment. These inputs are enabled
when 24VAC is applied.
Energy Recovery
An Energy Recovery Ventilator can use the [ERV] input to have
the J+ unit run the fan. If the fan is already running, the fan will
continue to run at the speed set by the active thermostat inputs.
If the fan is not running the fan will run at the [ERV] fan setting.
Humidifier
The Humidifier [HUM] input can be used to have the J+
control enable an external humidifier by using the
[HUMDFR] relay output. The [HUMDFR] relay output is a
dry set of contacts.If the fan is running already the fan will
continue to run at the speed set by the active thermostat
inputs. If the fan is not running the fan will run at the humid-
ifier [HUM] fan setting.
1 2
3
457
8
9
6
1 HVAC Outputs
2 HVAC Inputs
3 LCD Buttons
4 Temperature
5 Pressure
6 JMP
7 FAN
8 24VAC
9 T-Stat Inputs
HP Defrost
The DFS terminals on the control board are designed to
accept a 24v signal from an outdoor HP during it’s defrost
cycle. For firmware versions (see section on how to check
firmware versions) 1.6 or greater, In this mode, if the fan
is running already the fan will continue to run at the speed
set by the active thermostat inputs. Once the delivered air-
flow is measured with a CFM greater than 300 (verify on
the display screen) the W2 relay output will be enabled. If
the fan is not running the fan will run at the defrost [DFS]
fan settings. In versions 1.5 or less, if there is already a
demand from the thermostat inputs the fan speed will
change to the DFS speed (or static pressure set point)
then change back once DFS call has been removed.
Fault Relay
The fault relay will close under the following conditions.
When the float switch is tripped or if the pressure is less
than 0.1 IWC after the pressure prove time has elapsed.
To Next Page
Loading...