White-Rodgers 48M55-751 Instructions D'installation

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
• 48M55-751 Air Handler Control
• Installation Instructions
48M55-751 is an aftermarket OEM Direct replacement control for Carrier and ICP air handlers. The control can be
configured to replace either PSC or ECMx (constant torque) blower motors.
Input Voltage:
24 VAC, 50/60 Hz (Class II transformer)
Operating Temperature Range:
-40° to 176°F (-40° to 80°C)
Humidity Range:
5 to 95% relative humidity (non-condensing)
Timings:
Blower ON
Thermostat Call
Delay
Fan (G) None
Electric Heat (W) None
NOTE: Install all wiring according to local and national
electrical codes and ordinances
1. Prior to removing the old control, mark or take a picture of
the wiring connections.
2. Mount the new control using supplied sheet metal screws,
ensure the indicated ground points are secured.
3. For PSC blower applications, the thermostat and
transformer connections can be made using either the
1/4" spade terminals or the 6-pin inline connector on
the control. Remove the protective cap from the spade
terminals on top of the PSC relay and connect the motor
and power leads.
Blower OFF
Delay (SW1)
0 or 90 seconds
None
INSTALLATION, MOUNTING, AND WIRING
emerson.com/white-rodgers
48M55-751
Carrier / ICP Air Handler Control
for PSC or ECMx Blower Motors
INSTALLATION INSTRUCTIONS
• 4 – 3/4" Sheet Metal Screws
SPECIFICATIONS & TIMINGS
CAUTION
!
Risk of Electric Shock.
Disconnect electric power
to system until installation
is complete. Do not use on
circuit exceeding specified
voltage. Higher voltage will
damage control and could
cause shock or fire hazard.
This control is not intended
for use in locations where
it may come in contact with
water.
4. For ECMx blower applications, the thermostat and
transformer connections are made using the 6-pin inline
connector. Remove the protective cap from the ECMx SPT
terminal and connect the motor lead.
5. Configure the control for PSC applications by placing
the jumper on the pins marked C PSC. Configure the
control for ECMx applications by placing the jumper on
the pins marked W ECMx (default). Note that this setting
configures pin 1 of the inline connector as either C for
PSC motors or W for ECMx motors.
6. Select the blower off delay for fan (G) calls by setting the
dipswitch to either 0 or 90 seconds (default).
PARTS INCLUDED
DESCRIPTION
PART NO. 37-7723001
1929