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I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
IV. OPERATING INSTRUCTIONS
Your unit has been pre-set for 1 of 3 control modes:
1.
On/Off
2.
Proportional
3.
Proportional and Integral
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. Below the table is a more detailed description of the setpoint parameters. All setpoints have pre-set default values to
simplify programming. Instructions for adjustment follow.
Setpoint Parameters
Control Setpoint
Limit Setpoint (Note 3)
High Humidity Alarm
Low Humidity Alarm
Capacity Setpoint
Auto Drain
Low Drain Threshold
Steam Output Rating
Electrode Current Rating
High Drain Threshold
Cycle Time
Proportioning Band
Integration Period
Throttling Range (Note 3)
Unit Address
Low Drain Limit
Manual Drain
Leakage Protection
End of Cyl. Life Setpoint
Electrode Run Time
Limit Input (Note 3)
Control Input
Drain Tempering
Notes:
1.
On units where voltage is 380 VAC or greater, the cycle time is 75 seconds. On units where voltage is 240 VAC or less, the cycle time is 90 seconds.
2.
On units where voltage is 380 VAC or greater, the cycle time is 130 seconds. On units where voltage is 240 VAC or less, the cycle time is 150 seconds.
3.
If a unit is ordered with the modulating high limit, the Limit Input will be ENABLED. If an "On/Off" type or no high limit is used, the Limit Input and Throttling Range
screens will have been eliminated.
Parameter Definitions: All Control Modes
• Output Rating - Unit design capacity (lbs/hr).
• Electrode Rating - Current rating that corresponds to unit design capacity.
• Capacity Rating - Output capacity as a % of the output rating.
• Low Drain Threshold - Minimum output capacity % that initiates a drain cycle.
• High Drain Threshold - Maximum output capacity % that initiates a drain cycle.
• Auto Drain - Time in days between system shutdown and cylinder drain.
• Manual Drain - Operator activated cylinder drain
• Drain Tempering - Allows mixing of cool inlet water with drain water for tempering
• Cycle Time - Time in seconds between fill cycles.
• Unit Address -In network installation; "master unit" is "00", slaves "01" to "99".
• Leakage Protection - Electrically disconnect electrodes during drain cycle.
• Electrode Run Time - Hours of cylinder operation.
• Control Input - Space condition humidity input device.
• End of CYL Life Setpoint - Unit has not achieved desired output within specified
time.
H e r r t r o n i c
M D S e r i e s
®
Control Mode
Menu to
Adjust Setpoint Range
Adjust
1
2
3
X
2
X
X
2
X
2
X
2
X
X
X
2
X
X
X
2
X
X
X
2
X
X
X
3
X
X
X
3
X
X
X
3
X
X
X
3
X
3
X
3
X
X
3
X
X
X
3
X
X
X
3
X
X
X
5
X
X
X
5
X
X
X
5
X
X
X
5
X
X
5
X
X
X
5
X
X
X
5
Preset Values
20-98%
20-99%
20-100%
10-98%
10-100%
0-99 Days
50-100%
0-999 lbs/hr.
5-30 lbs/hr.
0-999 Amps
As required
100-120%
30-300 Sec.
75 /(90) See note 1
+/- 2 to 15%
+/- 10%
0-60 Min.
0-25%
0-99
25-75%
Active/Inactive
On/Off
1-500 hrs.
0-999,999 hrs.
Enable / Disable
Enable / Disable
Active/Inactive
Inactive
Specific Control Modes (See Chart)
• Control Setpoint - Desired % RH
• Limit Input - Modulating high limit from a controller or sensor
• Limit Setpoint - Maximum allowable % RH limit
• Low Humidity Alarm - Indication of control humidity level below alarm setpoint.
• High Humidity Alarm - Indication of control humidity level exceeding alarm set-
point.
• Proportioning 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.
All setpoints have pre-set default values to simplify programming -Instructions for
adjustment follow.
w w w. h e r r m i d i f i e r - h v a c . c o m
MDM
MDS/MDD
Preset Values
35%
35%
75%
75%
99%
99%
10%
10%
100%
100%
7 Days
7 Days
85%
80%
10-100 lbs/hr.
As required
110%
110%
130 /(150) See note 2
+/- 10%
30 Min.
30 Min.
10%
10%
01
01 MDS (00, 01 MDD)
50%
50%
Active
Active
Off
Off
6 hrs.
6hrs.
0
0
Enable
Enable
Enable
Enable
Inactive
13
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