DECTRON
CFM
Dectron, Inc. March 2012
DSH/DSV/RSH/DBH/RBH Series Dehumidifier Owner’s Manual
T.A.B. Test, Adjust, and Balance Airflows
Data subject to change without notice.
196
CFM
Exhaust- Air
Flow Rate
Refer to ANSI / ASHRAE Standard 111-2008.
The following procedure does not apply to units with the Economizer feature(see Appendix M5) or the Purge
feature (see Appendix M6).
If the exhaust system (if any) is by others, then the exhaust airflow should not be allowed to interfere with the
unit airflow or with the air-balancing effort.
1. Following all appropriate safety procedures, adjust blower speed as necessary to cause supply airflow A to
be within ±10% of the value in BOX A. Note that blower current is not
an adequate measure of airflow.
Do not exceed maximum speed of blower. Do not
exceed maximum current of blower motor.
NOTE: Some blower motors may be part-winding start start (2 contactors). In this case, measure the total
blower-motor current, not the part-winding current. Do not confuse part-winding with Y-Δ start (3 contactors).
2. Adjust outdoor volumetric airflow C to be approximately equal to the value shown in BOX C. To do this,
temporarily disconnect power from the unit and move the outdoor-air damper stop (see previous page), then
re-connect power. Measure airflow C and repeat as necessary.
NOTE: For outdoor units with hooded intakes, see notes on following page.
3. Some units may be equipped with an optional exhaust blower. In this case, adjust exhaust volumetric airflow D
to the value shown in BOX D. Note that blower current is not
an adequate measure of airflow.
NOTE: For outdoor units with hooded exhausts, see notes on second page previous.
4. If the exhaust system (if any) is by others, adjust the exhaust volumetric airflow to approximately 110% of air
flow C to maintain a slight negative pressure on the space.
5. Confirm that supply airflow A is still equal to the nameplate value within ±10%. Correct as necessary. Do not
exceed maximum speed of blower. Do not
exceed maximum current of blower motor.
NOTE: Some blower motors may be part-winding start. In this case, measure the total blower-motor current,
not the part-winding current.
6. Airflow A and airflow C (if any) and airflow D (if any) must be correct at the same time. Check again to
be sure. If any airflow is not correct, correct it as necessary and check all airflows again. If all airflows are
correct, proceed to next page.
7. Enter values in checklist at the end of this section.
Sample Only
Actual layout
may vary.
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.
WARNING
CFM
Required Outdoor-Air Flow
Copy BOX C from previous page.
Required Exhaust-Air Flow
Copy BOX D from previous page.
Outdoor- Air Intake
Flow Rate
Supply- Air
Flow Rate
Required Supply-Air Flow
Copy BOX A from previous page.
Measured Outdoor-Air Flow
Measured Exhaust-Air Flow
Measured Supply-Air Flow
T.A.B.
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