GeneralAire DH70 Dehumidifier - Manual (Page 4)

4
F. Installation in a Structure with No Existing Forced Air HVAC System (Whole House Dehumidification)
When installing the DH70 in a structure that does not have a forced air HVAC system, a single return for the DH70
should be installed in central open area of the structure.
DO NOT locate the return in a bathroom or a kitchen. The
supply of the DH70 should be located in the remote areas of the structure (such as bedrooms, den, etc.). By ducting
this way, the air inside the structure will circulate through the DH70 to be filtered and dehumidified. 5” diameter duct is
recommended for branches to the bedrooms, 6” diameter duct is recommended for branches to larger areas.
G. Installation in a Sealed Crawl Space or Sealed Attic (Spot Dehumidification)
When installing the DH70 in sealed crawlspace or sealed attic, a single return for the DH70 should be installed in
central open area of the structure. If the area is open without partitions return ducting is not necessary. Supply
ducting is recommended to enhance the performance of the system, a minimum length of supply duct, 3’ to 6’ will
aid in air distribution. If the area(s) being served are divided by walls or partitions, a supply and return duct system is
recommended. In all cases sound duct design practices must be followed such as those provided in ACCA manual “D”,
or ASHRAE’s “Fundamentals of Air System Design”.
Wiring Unit Schematic
Freeze
Stat
Blower Motor
Compressor
S
R
C
Fan Relay
Compressor
Run Capacitor
120 Volt 60Hz 15 Amp
1 Phase Power Supply
Compressor Relay
7 8
GT
GF
RF D G C R
Humidistat / Ventilation Control
Blower InterLock Connections (Low Voltage)
Fan Coil / Air Handler
Control Thermostat (Typ)
G
R
W
Y
G
R
W
Y
Existing Field Supplied
Control Wiring (Typ)
Field Supplied Control Wiring
Disconnect Existing Control Wiring
From Fan (G) Control Terminal
Reconnect to Blue Wire From DVA
Connect Brown Wire From DVA
To Fan (G) Terminal
Org Brn
Blu
Wiring Connections Line and Low Voltage
GT
GF
RF
Red Wht Gry Yel Org Brn Blu
3
5
1
4
6
2
Blower Motor
Run Capacitor
7 8
3
5
1
4
6
2
Low Voltage Terminal
Transformer
Humidistat
OPTIONAL
*
*
* Remove Jumper If Fan Control Is Used
Molex 50-84-1040