Herrtronic
®
MD Series
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
16
www.herrmidifier-hvac.com
Start-up with Check List
After all programming is completed (and the total installation is
complete), the Herrtronic MD system is ready to start. At the
end of START-UP section is a CHECK-LIST. The CHECK-LIST
is intended to highlight critical installation points. A poor installa-
tion frequently results in start-up difficulties, and always results
in less than ideal operation of the humidifier.
IMPORTANT- Before any Herrmidifier representative or the
factory is contacted with a start-up problem; please have the
checklist completed as far as possible.
1. Set all controls to their lowest setting (control and high limit
if applicable). In systems using distributor pipes, make sure
the fan is operating. By placing the controls at their lowest
setting and turning the unit “ON” at the “ON/OFF” button,
the unit should not try to initiate production of steam. On
MDD units it is necessary to turn the Slave “on” through the
communications, Menu 4.
Find the lowest setting in each Control Mode as follows:
•
Mode 1 (On-Off)-Turn the dial to the OFF position or
its lowest setting.
•
Mode 2 (Proportional) - Set the controller to send the
lowest signal in the range (i.e. 4 mA in a direct 4-20
mA range).
•
Mode 3 (P + I) - Set “Control Setpoint” through Menu
2 at least 11% below the “Control RH” displayed in
Menu 1.
2. Set high limit to its highest setting (all control modes).
3. Set CONTROL input to get the Herrtronic MD to attempt
100% of capacity as follows:
•
Mode 1 (On-Off) - An audible “click” will be heard
when the humidistat is asking for full output.
•
Mode 2 (Proportional) - Set controller to send
Herrtronic MD a full signal (i.e. 20 mA in a direct 4-20
mA output range).
•
Mode 3 (P + I) – Set “Control Setpoint” through Menu
2 20% Above “Control RH” displayed in Menu 1.
4. TURN UNIT ”ON”. (ON MDD UNITS, BOTH MASTER AND
SLAVE BOARDS MUST BE TURNED “ON”.) Slave units
can be turned on via the Master board through communica-
tions or directly from the slave circuit board. Once the unit
gets the signal to run and unit is turned “On”, the contactor
will pull in within 5 seconds, followed by the fill valve be
-
ing energized. The unit will attempt to fill to FULL OUTPUT
(100%) or CYLINDER FULL. If the unit fails to reach 75%
of capacity on the initial fill (as shown by CYLINDER FULL
light illuminated and <75% Output), you should use the
jumper wires enclosed in the accessory envelope and ar-
range them as shown on the diagrams on Figure 28, page
21. Be sure to disconnect power first and re-tighten each of
the electrode knobs.
NOTE!
THIS WILL NOT BE POSSIBLE ON UNITS WHICH AL-
READY HAVE POWER TO EACH ELECTRODE OR ANY
MDM. Before restarting the unit, drain half the water from the
cylinder using “Manual Drain” found in Menu 5.
5. If low conductivity water is being supplied, as indicated by
a low percentage of output (70% and under) and the CYL-
INDER FULL light is illuminated, you may want to artificially
increase the output. This is accomplished by the following
procedure:
•
Drain 1/2 the water from the tank using the manual
drain option in Menu 5.
•
Add 1 Alka-Seltzer tablet
•
Restart
•
Repeat if needed
6. Fill System (Fig. 20) Check Points
•
No leaks in system
•
Virtually all the water entering the FILL TEE should
be going down the FILL TUBE as opposed to the
OVERFLOW TUBE. A slight adjustment may be
needed to the Metering Screw (Fig. 21) if water sup-
ply pressure is too high. Turn the screw clockwise to
close, or counter clockwise to open.
Figure 20
7. If you need to “TEMPER” the drain water because of lo-
cal codes or low temperature drain piping is used, activate
“DRAIN TEMPERING” (Menu 5)
NOTE!
The drain water is TEMPERED or COOLED by the addition of
fresh water while the drain solenoid is open. The proper rate
of fresh water will cool the drain water and still allow the hu-
midifier to drain freely. Use the fill valve adjusting screw (Fig.
21) to regulate the flowrate of the cool inlet water. The amount
of tempering will depend on incoming temperature and pres-
sure of the water supply.
8. Once the water is boiling and steam is being produced,
check the following:
•
No leaks in the steam distribution lines or connec-
tions.
•
The steam has a clear path from the cylinder to its
distribution points. Any low spots in the steam distri-
bution line must be trapped. (See Fig. 6)
9. Unit needs to drain hot water to check proper drain line in-
stallation. Unit may be draining through normal operation,
but if not, initiate a drain through the MANUAL DRAIN in
