DriSteem DS 301 Safety, Installation, And Operation Manual

Safety, Installation, and Operation Manual
READ COMPLETE INSTALLATION INSTRUCTIONS BEFORE STARTING.
WARNING
This product must be installed by a qualified heating and air conditioning contractor. Failure to do so
could result in serious injury from electrical shock or damage to product and voids product warranty due
to possible product misapplication.
THESE INSTALLATION INSTRUCTIONS ARE FOR THE HUMIDISTAT ONLY!
For DRISTEEM ® Humidifier installation, follow DRISTEEM Humidifier Installation Instructions.
WARNING
1. Contact with energized electrical circuits may cause serious injury
from electrical shock. Disconnect electrical power to the Humidifier
before starting installation.
2. Sharp edges may cause serious injury from cuts. Use care when
cutting plenum openings and handling ductwork.
CAUTION
1. Do not set humidity higher than recommended or moisture can
accumulate, which may cause bacteria and mold growth or dripping
water into building spaces. Dripping water may cause property
damage; bacteria and mold growth may cause illness.
2. Do not set humidity up to recommended levels if there is
condensation on the inside of windows. Condensation damage
may result.
3. Do not mount Humidistat on supply plenum or duct. High supply
temperatures will cause the control to malfunction.
4. When installing Humidistat on downflow furnaces, ensure that
blower continues to run as programmed after a heat call is satisfied
to eliminate high temperatures from damaging the Humidistat.
DRISTEEM Duct Mounted On-Off Humidistat (DS 301)
and Duct Mounted Modulating Humidistat (DS 401)
PRINCIPLES OF OPERATION
The DRISTEEM Duct Mounted On-Off Humidistat (DS 301) and Duct
Mounted Modulating Humidistat (DS 401) are designed to be installed in
the return duct or return plenum only of the HVAC system. The Control
supplies a modulating signal to the humidifier. In terms of outdoor
temperature compensation, the Control can be set up in automatic or
manual mode, regardless of the humidifier model being controlled. The
automatic mode incorporates the supplied Outdoor Temperature Sensor to
automatically adjust the control set-point based on the outdoor
temperature. The manual mode does not require an outdoor temperature
measurement and is used for specific set-point control with the control set-
point manually adjusted by the user. The DRISTEEM Duct Mounted On-Off
Humidistat (DS 301) and Duct Mounted Modulating Humidistat (DS 401) will
accurately control the humidity in the conditioned space within the range of
15% – 55% RH.
CONTROL TYPE
ON-OFF CONTROL
The DRISTEEM Duct Mounted On-Off Humidistat (DS 301) sends a 10 VDC
signal to the humidifier when the measured return air relative humidity is
3% or more below the set-point. This energizes the humidifier at 100%
output. The Humidifier is either on at 100% capacity or it is off.
MODULATING CONTROL
The DRISTEEM Duct Mounted Modulating Humidistat (DS 401) sends a
signal to the humidifier between 0 and 10 VDC based on: a) the difference
between measured relative humidity and set-point relative humidity, and b)
where this difference or 'error' falls within an adjustable proportional
control band. The output of the Control, and therefore the Humidifier, is a
'proportion' of maximum output based on 'a' and 'b' above. See Figure 1
for graphical representation of the output.
1