Herrmidifier Herrmidicool - Manual (Page 6)

Herrmidicool IOS Manual
I n s t a l l a t i o n , O p e r a t i o n & S e r v i c e M a n u a l
6 www.herrmidifier-hvac.com
Control Circuit Connections
I. Mode 1--On/Off (OPTIONAL – Limited Application)
1. Control Input - Unit will operate with any two-position
device. Demand for humidity will close the contact.
2. Limit Input - Unit will operate with any two-position
device. The humidistat contact will open on humidity
rise.
II. Mode 2 -- Proportional (Optional – Limited Application)
A. Control Input - Interpreted by the humidifier as a
demand of output signal. Input device should be linear.
Unit can accept any VDC or mADC signal within a
range of 0-20 VDC or mADC.
B. Limit Input - Unit may accept any modulating input
within the same ranges as the control inputs listed
above.
1. Proportional VDC or mADC
2. Resistive
3. Two position device
Additionally, a P + I sensor may be used as a limit input.
1. VDC
2. mADC
III. Mode 3 - Proportional + Integral Configuration
1. Control Input - Unit will accept any sensor input that
provides a VDC or mADC signal within a range of 0-20
VDC or mADC that is proportional to the humidity level
in the air. The sensor may be direct or indirect acting
but must not have impedance greater than 500 ohms,
and should be linear. Example - A direct acting 2 - 10
VDC wall sensor will send a 2 VDC signal if the R.H.
level in the space is 10%; it would send a 10 VDC
signal if the R.H. level is 90%. The humidifier receives
this input and compares it to the setpoint that has
been programmed into the unit. The microprocessor
modulates the output capacity of the atomizer. The
adjustable integration period will review performance
over the given time and will make tuning adjustments
by shifting the proportional bandwidth to correct for
over or under humidification offsets automatically.
2. Limit Input - Unit can accept any two-position device or
any sensor input as specified above.
1. Two position device
2. VDC sensor input.
3. MADC sensor input.
Operating Instructions
Setpoint Parameters
Your AH-1200 Series unit has been preset for 1 of 3
control modes.
1. On/Off
2. Proportional
3. Proportional + Integral (Standard)
With each control mode, there is a specific set of operating
parameters and setpoints that apply. All of the setpoints have
been preset at the factory to simplify the start-up procedure.
The following table identifies the parameters, setpoints and
preset values that apply to each mode.
Standard units have the modulating limit feature enabled. If
for some unique application, an “On/Off” type or no high limit
is used, the “Limit Input” and “Throttling Range” screens will
not be visible or used.
Parameter Definitions: All Control Modes
Output Rating – Unit design capacity (lbs/hr.)
Capacity Setpoint – Output capacity as a % of the output
rating.
Unit Address – In network installation; “master” is “00”,
“slaves” “01” to “99”.
Run Time – Hours of operation
Control Input – Space or Return Air humidity input
device.
Specific Control Modes (See Chart Page 7)
Control Humidity Setpoint – Desired %RH
Limit Humidity Setpoint – Maximum allowable %RH
Low Humidity Alarm – Indication humidity levels beneath
alarm setpoint.
Proportional Band – Humidity span around control
setpoint where modulation occurs.
Integration Period – Length of time period for %RH
evaluation and adjustment
Throttling Range – Humidity range below limit setpoint
where modulation occurs.
Limit Input – Modulating high limit from a controller or
sensor.
High Humidity Alarm – Indication of humidity levels
exceeding alarm setpoint.
All setpoints have preset default values to simplify
programming – Instructions for adjustment are following.