103142-YIM-A-1204
6
Unitary Products Group
DEHUMIDIFICATION CONTROL
A dehumidification control accessory 2HU06700124 may be used with
variable speed air handlers or furnaces in high humidity areas. This
control works with the variable speed indoor unit to provide cooling at a
reduced air flow, lowering evaporator temperature and increasing latent
capacity. The humidistat in this control opens the humidistat contacts on
humidity rise. To install, refer to instructions packaged with the acces-
sory and Figures 7-9. Prior to the installation of the dehumidification
control, the jumper across the HUMIDISTAT terminals on the indoor
variable speed air handler or furnace CFM selection board must be
removed.
During cooling, if the relative humidity in the space is higher than the
desired set point of the dehumidification control, the variable speed
blower motor will operate at lower speed until the dehumidification con-
trol is satisfied. A 40-60% relative humidity level is recommended to
achieve optimum comfort.
If a dehumidification control is installed, it is recommended that a mini-
mum air flow of 325 cfm/ton be supplied at all times.
SECTION VI: EVACUATION
It will be necessary to evacuate the system to 500 microns or less. If a
leak is suspected, leak test with dry nitrogen to locate the leak. Repair
the leak and test again.
To verify that the system has no leaks, simply close the valve to the vac-
uum pump suction to isolate the pump and hold the system under vac-
uum. Watch the micron gauge for a few minutes. If the micron gauge
indicates a steady and continuous rise, it’s an indication of a leak. If the
gauge shows a rise, then levels off after a few minutes and remains
fairly constant, it’s an indication that the system is leak free but still con-
tains moisture and may require further evacuation if the reading is
above 500 microns.
SECTION VII: SYSTEM CHARGE
The factory charge in the outdoor unit includes enough charge for the
unit, a 15 ft. line set and the smallest rated indoor coil match-up. Some
indoor coil matches may require additional charge. See tabular data
sheet provided in unit literature packet for charge requirements.
The “TOTAL SYSTEM CHARGE” must be permanently stamped on the
unit data plate.
Total system charge is determined as follows:
1.
Determine outdoor unit charge from tabular data sheet.
2.
Determine indoor coil adjustment from tabular data sheet.
3.
Calculate the line charge using the tabular data sheet if line length
is greater than 15 feet.
4.
Total system charge = item 1 + item 2 + item 3.
5.
Permanently stamp the unit data plate with the total amount of
refrigerant in the system.
Use the following subcooling charging method whenever additional
refrigerant is required for the system charge. A superheat charging
method is not suitable for TXV equipped systems.
FIGURE 7:
Typical Variable Speed Air Handler Thermostat Wiring
FIGURE 8:
Typical Variable Speed Furnace Thermostat Wiring
FIGURE 9:
Typical Previous Generation Variable Speed Furnace
Thermostat Wiring
VARIABLE
SPEED
AIR HANDLER
2 -STAGE
AIR CONDITIONER
C
Y1
R
W
O
G
C
Y1
R
O
Y
W2
W1
G
X/L
X/L
1
2
1
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
JUMPER ON CFM SELECTION BOARD MUST BE
.
HUMIDISTAT
REMOVED
2
Y1, Y2, AND HUM LOCATED ON CFM SELECTION BOARD.
THERMOSTAT
E
Y2
Y2
HUM
BLU/YEL
YEL
BLK
RED
1
VARIABLE
SPEED
FURNACE
2-STAGE
AIR CONDITIONER
C
Y1
R
W
O
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
JUMPER MUST BE IN
POSITION.
HUMIDISTAT INSTALLED?
YES
G
C
Y1
R
O
Y2/Y
W2
W1/W
G
HUM
X/L
X/L
1
2
THERMOSTAT
Y2
BLK
YEL
BLU/YEL
RED
2
HUM LOCATED ON CFM SELECTION BOARD.
E
1
VARIABLE
SPEED
FURNACE
2-STAGE
AIR CONDITONER
C
Y1
R
W
O
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
JUMPER ON CFM SELECTION BOARD MUST BE
.
HUMIDISTAT
REMOVED
G
C
Y1
R
O
Y
W2
W1
G
HUM
X/L
X/L
1
THERMOSTAT
Y2
BLK
YEL
BLU/YEL
RED
E
Y2
R-410A refrigerant cylinders are rose colored, and have a dip tube
which allows liquid to flow out of the cylinder in the Upright Posi-
tion. Always charge the system slowly with the tank in the upright
position.
Do not leave the system open to the atmosphere. Unit damage
could occur due to moisture being absorbed by the POE oil in the
system. This type of oil is highly susceptible to moisture absorp-
tion.
