MORTEXPRODUCTSINC.501TERMINALRDFORTWORTH,TEXAS76106 Page14
FIELD INSTALLED SUPPLEMENTAL HEAT
LOCKOUT (SHL) KIT:
Field Installed SHL is to be used with model SEHX and
CEHX models with factory installed electric heat used
with a heat pump system. The temperature switch is to
prevent excessive refrigerant liquid pressures due to the
evaporator coil being located after the electric heaters. If
the electric heater is energized while the heat pump is
operating in the heat mode, the added heat that the
evaporator coil will see will cause the refrigerant liquid
pressures to be excessively high. The SHL temperature
switch will lock out the electric heat until the refrigerant
liquid temperature falls to approximately 109°F causing
the switch to close. The switch resets (opens) at
approximately 120°F.
INSTALLATION:
Use the insulation tape that is provided in the kit. Wrap
sensor on liquid line and secure with the plastic ties that
are provided in the kit, refer to Figure 12. After the
brazing and leak testing of the refrigerant lines is complete
and the lines have cooled off mount the temperature
switch to the liquid line assuring temperature switch has
good contact with the liquid line and not located where it
may be damaged.
WIRING:
One of the pigtail leads are connected in series to the
white pigtail wire on the unit, refer to Figure 12. Secure
the wires with a wire nut. The other pigtail lead is
connected to the white thermostat wire and secured with a
wire nut. This wiring prevents the electric heaters from
energizing until the SHL switch closes. Check outdoor
unit and thermostat diagrams to assure the SHL will
prevent the supplemental electric heat from being
energized.
Figure 11: Proper Mounting of the SHL Temperature
Switch
R
C
G
W
R
C
G
W
SHL
Switch
Temperature
Closes at 110 DEGF
Figure 12: Proper Wiring of the SHL Temperature
Switch
SHL Switch Location
Figure 13 Heat Pump Heating Cycle: SHL switch is
secured to the 3/4” or 7/8” pipe next to the evaporator.
SHL Switch Location
Figure 14 Cooling Cycle: SHL switch is secured to the
3/4” or 7/8” pipe next to the evaporator.
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