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50VT-K: Installation Instruction
must open the control circuit on humidity rise above the
dehumidification set point.
1. Using
Fig.
19, move the two pin DEHUM jumper from the "STD"
position to the "DEHUM" position.
2. Remove fan speed tap wire from the "LOW" terminal on the
interface fan board (IFB) (See
3. Determine correct normal cooling fan speed for unit and
application. Add the wet coil pressure drop in
static to determine the correct cooling airflow speed in
will deliver the nominal cooling airflow as listed in
size.
NOTE: If accessory electric heat is installed, the dry airflow must meet
or exceed the minimum airflow speed specified in
specific size unit. The electric heat fan speed will be the same as the
normal cooling fan speed.
4. Remove the vinyl cap off of the desired speed tap wire (Refer to
Table 3
for color coding) for the normal cooling fan speed and place
desired speed tap wire on "HIGH" on the interface board.
5. Refer to airflow tables
(Table 4
speeds for the dehumidification cooling fan speed. In
Table
6, speeds that are not allowed for dehumidification cooling
are shaded.
6. Remove the vinyl cap off of the desired speed tap wire (Refer to
Table 3
for color coding) for the dehumidification cooling fan speed
and place desired speed tap wire on the "LOW" connection on the
interface board (IFB). Verify that static pressure is in the acceptable
range for the speed tap to be used for dehumidification cooling.
7. Use any spare vinyl plugs to cap any unused speed tap wires.
Single Speed Cooling With Higher Electric Heat Speed
This unit can also be configured to operate with single speed cooling and
a higher speed for an accessory electric heater.
1. Move the two pin DEHUM jumper located on control board (see
Fig.
19) from the "STD" position to the "DEHUM" position.
2. See
Table 2
for minimum airflow for electric heat operation. Add
electric heater and filter pressure drop to duct system static pressure
to determine total external static pressure.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig.
19).
Table 6
to the system
Table 4
Table 1
for each
Table 2
for the
-
Table
6) to determine allowable
Table 4
Fig. 18 – Typical Heat Pump Operation, Cooling Mode
3. Select speed tap from
from
Table
2.
4. Remove the vinyl cap off of the desired speed tap wire (Refer to
Table 3
for color coding).
5. Connect the desired speed tap wire to the "HIGH" terminal on the
interface fan board (IFB).
that
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit component damage or
improper operation.
To use this mode, a speed connection must be made on the "HIGH"
terminal that meets or exceeds the minimum airflow found in
Table 3 – Color Coding for Indoor Fan Motor Leads
-
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect electrical power to the unit and install lockout tag before
changing blower speed.
Continuous Fan Operation
When the DEHUM feature is not used, the continuous fan speed will be
the same as cooling fan speed. When the DEHUM feature is used, the
continuous fan will operate on IFB "LOW" speed when the DH control
lead is not energized, or IFB "HIGH" speed when the DH lead is
energized (see
Fig.
19).
21
Table 4
that will achieve required airflow
CAUTION
!
Black = High Speed
Orange = Med-High Speed
Red = Med Speed
Pink = Med-Low Speed
Blue = Low Speed
WARNING
!
Table
2.
C03011
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