Owners Manual DA2 Series Dehumidifier
Adjust Blower Speed Startup
Dectron, Inc. November 2009 23
Data subject to change without notice.
NOTE: All units must have a minimum three feet of duct connected to the blower outlet. If substantially more duct
is connected to the unit, an air-balance technician must set the airflow to within ±10% of AIR VOLUME as
shown on the unit nameplate.
If only the minimum 3 feet of duct is connected, adjust the airflow as shown below:
1. Monitor the blower-motor current with a clip-on ampmeter (by others). Do not allow the line current(s) to exceed
the FLA shown on the nameplate.
2. Adjust the blower speed using the variable pulley on the blower motor, so that the motor current is at or slightly
below the full-load current (FLA) of the motor, as shown on the nameplate.
NOTE: All access doors and panels must be in place for blower-motor current measurement.
If the motor is 3-phase, check the other lines to be sure that no phase current exceeds the FLA.
3. Check the return-air temperature and the temperature of the air leaving the cooling coil. Depending on the
space temperature and relative humidity, there should be a temperature difference of 19°F (10.5°C) to
25°F (13.9°C) across the cooling coil.
Sample
Actual appearance
may vary.
To prevent compressor
operation during blower-
speed adjustment, raise the
humidistat set point to some
value greater than the
relative humidity of the air in
the space.
Risk of contact with moving parts. Can cause injury or death.
This product contains rotating parts and V-belt drives. Some installation, service, and
maintenance procedures could expose personnel to the risk of injury or death from
contact with these parts.
Using only approved devices (e.g. locking safety switch), disconnect, lockout, and
tagout all sources of electrical energy before working inside the unit cabinet. Allow
adequate time for rotating parts to stop. Follow all applicable safety regulations.
Risk of pinching or crushing. Can cause injury.
Access doors and panels are under a strong negative pressure when the blower(s) is
running. Opening doors may be difficult. Closing doors must be done with a tool to
prevent hands from being pinched or crushed.
WARNING
WARNING
Some units may have an ENABLE switch built into the cabinet.
Other units may have remote ENABLE switches. In either case, turn the ENABLE switch ON.
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