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19
NOTE
: If accessory electric heat is installed, and the electric heat
fan speed is chosen to be the same as the normal cooling fan speed,
the dry airflow must meet or exceed the minimum airflow speed
specified in Table 2 for the specific size unit.
Two Cooling Fan Speeds Set-up (Dehumidification
feature used)
IMPORTANT
: Dehumidification control must open control
circuit on humidity rise above set point.
Use of the dehumidification cooling fan speed requires use of
either a 24 VAC dehumidistat or a thermostat which includes
control of a 24 VAC dehumidistat connection. In either case, the
dehumidification control must open the control circuit on humidity
rise above the dehumidification set point.
1. Using Fig. 16, 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 Fig. 16).
3. Determine correct normal cooling fan speed for unit and
application. Add the wet coil pressure drop in Table 8 to
the system static to determine the correct cooling airflow
speed in Table 4 that will deliver the nominal cooling
airflow as listed in Table 1 for each size.
NOTE
: If accessory electric heat is installed, the dry
airflow must meet or exceed the minimum airflow speed
specified in Table 2 for the 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) to determine allowable
speeds for the dehumidification cooling fan speed. In Table
4, 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. 16) 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.
3. Select speed tap from Table 4 that will achieve required
airflow 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).
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 2.
!
CAUTION
Table 3 – Color Coding for Indoor Fan Motor Leads
Black = High Speed
Orange = Med--High Speed
Red = Med Speed
Pink = Med--Low Speed
Blue = Low Speed
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.
!
WARNING
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. 16).
COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering De vice
Arrow indicates direction of flo
w
TXV in Metering
Position
Bypass
Position
HP S
C03011
Fig. 15 -- Typical Heat Pump Operation, Cooling Mode
50V
T
--
C
Summary of Contents for Comfort 50VT C Series
Page 3: ...3 Fig 2 24 30 Unit Dimensions 50VT C...
Page 4: ...4 Fig 3 36 60 Unit Dimensions 50VT C...
Page 11: ...11 A150518 Fig 12 Connection Wiring Schematics 208 230 1 60 50VT C...
Page 12: ...12 A150519 Fig 12 Cont Ladder Wiring Schematics 208 230 1 60 50VT C...
Page 13: ...13 A150520 Fig 13 Connection Wiring Schematics 208 230 3 60 50VT C...
Page 14: ...14 A150521 Fig 13 Cont Ladder Wiring Schematics 208 230 3 60 50VT C...
Page 15: ...15 A150522 Fig 14 Connection Wiring Diagram 460 3 60 50VT C...
Page 16: ...16 A150523 Fig 14 Cont Ladder Wiring Diagram 460 3 60 50VT C...