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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).