Nortec NHTC - Manual (Page 75)

10-20
Page 67
2008-10-01
m Manual capacity output adjustment range of 20-100%.
n Humidifier model, capacity, software version.
o Cylinder model # and capacity rating.
p Humidifier run time weighted hours.
q Date and time (year, month, day, hour and minute).
r Stand by heating to increase steam production response time.
s Rapid modulation capability reduces response time upon start-up.
t Short cycling detection and correction diagnostics.
u Foam detection and correction capability.
v Scroll through start-up and troubleshooting checklist on graphical display.
w Self-diagnostics during start-up to system test to prevent unsafe operation
of the unit(s).
x User adjustable drain/flush frequency.
HUMIDIFIER CONTROLS NHPC
(b) Proportional Controller microprocessor with following features or functions:
1 Graphic function display with user interface with touch type key pad.
2 Acceptance of industry standard [analogue continuous control demand signal
[0-1Vdc] [1-5Vdc] [0-10 Vdc] [2-10 Vdc] [0-16 Vdc] [0-20 mA]
3 Keypad/Display to monitor and control humidifier parameters.
a System demand in lbs/hr (kg/hr).
b Security loop status open/close.
c Control Channel 1 demand %.
d Manual capacity output adjustment range of 20-100%.
e Self-diagnostics during start-up to system test to prevent undase
operation of the Unit[s].
f Control signal type.
g Software version.
(c)
1 Internal communications via Modbus RTU protocol provides monitoring and
control allowing humidifier(s) to communicate to Building Management
System (BMS). Supporting a RS485 port with a configuration of 9600bps,
8-bits, no parity, one stop bit shall support the following variables:
a Change Cylinder – Indicates cylinder needs to be replaced (read).
b Channel 1 Input – Humidifier input value being supplied to channel 0-
100% (read/write).
c Channel 1 Set point – Control channel 1 setpoint for relative humidity in
space 0-100% (read/write).
d Channel 2 Input – Humidifier input value being supplied to channel 0-
100% (read/write).