Lennox Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42) Installation guide

Lennox
Brand
Lennox
Model
Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42)
Category
Wall & ceiling mounts accessories
Type
Installation guide

Lennox Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42) is designed to interrupt cooling operation when excessive condensate collects in the drain pan. The kit includes an overflow (float) switch, float switch mounting bracket, overflow switch delay, overflow switch relay, wire harness, screws, and wire ties. The float switch is a N.O. switch that is controlled by K220 and DL46 relays. When the overflow switch closes, 24VAC power is interrupted and after a five-second delay unit compressors are de-energized.

Lennox Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42) is designed to interrupt cooling operation when excessive condensate collects in the drain pan. The kit includes an overflow (float) switch, float switch mounting bracket, overflow switch delay, overflow switch relay, wire harness, screws, and wire ties. The float switch is a N.O. switch that is controlled by K220 and DL46 relays. When the overflow switch closes, 24VAC power is interrupted and after a five-second delay unit compressors are de-energized.

Page 1
Litho U.S.A.
507418-01
10/2014
Supersedes 507136-01
E2014
FLOAT SWITCH KIT
ROOFTOP UNIT KITS
AND ACCESSORIES
INSTALLATION INSTRUCTIONS FOR FLOAT SWITCH KIT
(602799-04 & 06; 74W42 & 10C24) USED WITH KG/KC/KH 024-300 UNITS
Shipping and Packing List
Package 1 of 1 contains:
1- Overflow (float) switch (S149)
1- Float switch mounting bracket
1- Overflow switch delay (DL46)
1- Overflow switch relay (K220)
1- Wire harness
2- Screws #10-32 X 1/2”
2- Screws #10-16 X 5/8” SDST
1- Screws #8-32 X 1” TFS
2- Wire nuts
15- Wire ties
Application
This kit is used on KG/KC/KH 024-300 units.
The overflow switch is used to interrupt cooling
operation when excessive condensate collects in the
drain pan. The N.O. overflow switch is controlled by
K220 and DL46 relays, provided in this kit. When the
overflow switch closes, 24VAC power is interrupted and
after a five-second delay unit compressors are
de-energized. Once the condensate level drops below
the set level, the switch will open. After a five-minute
delay the compressor will be energized.
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a qualified installer, ser
vice agency or the gas supplier
Installation
1- Disconnect all electrical power to unit and open
control access door.
2- Remove panel covering the condensate drain pipe.
3- Secure float switch to bracket. See figure 1. Secure
bracket to drain pan. See figure 2 for plastic drain
pans and figure 3 for stainless steel drain pans.
IMPORTANT - 024-150 UNITS ONLY - When condensate
drainage is required through the back of the unit: remove
drain pan, install float switch assembly on the left side of
the drain pan nipple and install with switch oriented
toward the back of the unit. See figure 4. Route wire
harness between the drain pan and heat section.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
FIGURE 1
SECURE SWITCH TO BRACKET
TWO NUTS
UNDER
BRACKET
BRACKET
FIGURE 2
FLOAT ASSEMBLY - PLASTIC DRAIN PANS
DRAIN PAN
FLOAT
SWITCH
BRACKET
Page 2
FIGURE 3
FLOAT ASSEMBLY - METAL DRAIN PANS
DRAIN PAN
FLOAT
SWITCH
BRACKET
FIGURE 4
SWITCH ASSEMBLY WITH DRAIN PAN REVERSED
(024-150 UNITS ONLY)
INSTALL SWITCH
ASSEMBLY ON LEFT SIDE
OF DRAIN PAN NIPPLE
Installation
1- Install two relays on control panel with screws
provided in kit. See figure 5 for 024-090 units, figure
6 for 092-150 units and figure 7 for 156-300 units.
2- Route wiring as shown in figure 8 for 024-090 units,
figure 9 for 092-150 units and figure 7 and 10 for
156-300 units. Secure wiring to existing harnesses
with wire ties.
3- Route wires marked S149 to float switch on drain
pan. Bundle excess wire and secure to insulated
suction pipe with provided wire ties.
4- Locate pink wire marked P35-1/96 in control area.
Cut wire, strip ends and connect kit harness as shown
in figure 11. Wires are stamped with the appropriate
marking.
5- 024-090 Unit Only -
Cut quick connect terminals off of ground wires, strip
and secure to ground lug.
6- 092-300 Units Only -
Connect the ground wires to ground terminal strip or
ground lug.
7- Reinstall panels and restore power to unit.
FIGURE 5
INSTALL RELAYS - 024-090 UNITS
DL46 RELAY
K220 RELAY
PINK WIRE
MARKED
96/P35-1
Page 3
FIGURE 6
INSTALL RELAYS - 092-150 UNITS
DL46 RELAY
K220 RELAY
PINK WIRE
MARKED
96/P35-1
Page 4
FIGURE 7
INSTALL RELAYS - 156-300 UNITS
Page 5
FIGURE 8
ROUTE AND SECURE WIRING - 024-090 UNITS
FIGURE 9
ROUTE AND SECURE WIRING - 092-150 UNITS
Page 6
FIGURE 10
ROUTE AND SECURE WIRING - 156-300 UNITS
Page 7
FIGURE 11
CONNECT WIRE HARNESS - ALL UNITS
024-090 UNITS:
CUT QUICK CONNECT
TERMINAL OFF OF
WIRE AND ATTACH
TO GROUND LUG
P35-1 96
K220-2
96P35-1
TO S149
S149
S149
GND
GND
DL46-2
DL46-1
024-090 UNITS:
CUT QUICK CONNECT
TERMINAL OFF OF
WIRE AND ATTACH
TO GROUND LUG DL46-5
KIT HARNESS
FACTORY WIRING
CUT PINK WIRE
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Lennox Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42) Installation guide

Lennox
Brand
Lennox
Model
Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42)
Category
Wall & ceiling mounts accessories
Type
Installation guide

Lennox Float Switch Kit (Drain Pan Overflow) -- KC/KG/KH 024-300 (74W42) is designed to interrupt cooling operation when excessive condensate collects in the drain pan. The kit includes an overflow (float) switch, float switch mounting bracket, overflow switch delay, overflow switch relay, wire harness, screws, and wire ties. The float switch is a N.O. switch that is controlled by K220 and DL46 relays. When the overflow switch closes, 24VAC power is interrupted and after a five-second delay unit compressors are de-energized.

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