10/2012
506944-01
*2P102012*
*P506944-01*
Page 1
LITHO U.S.A.
506944-01
10/2012
Supersedes 2/2012
HOT WATER HEAT KIT
KITS COMMON TO AIR HANDLERS
INSTALLATION INSTRUCTION FOR HOT WATER HEAT KIT (90W84)
E
2012 Lennox Industries Inc.
Dallas, Texas, USA
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.
Line voltage is present at all components
when unit is not in operation on units with
single‐pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
Shipping and Packing List
Check unit for shipping damage. Consult last carrier
immediately if damage is found.
Catalog
Number
Part Names
Part
Numbers
Qty.
90W84
DC Relay, 22VDC
102297-01
1
3PDT Relay
67K6601
1
Delay-On-Make Relay
99P41
1
9-Pin Wiring Harness
609345-01
1
Wiring Diagram
537516-01
1
Field-Provided Supplies
The following field-provided supplies may be required.
S
1/4” quick connects
S
Control wiring (various lengths)
General
Hot water heat kit (90W84) adapts CBX32MV and
CBX40UHV units for use with a boiler to provide hot water
heating in select applications. When used with an air
conditioner, the hot water provides first-stage heating.
When used with a heat pump, the hot water provides
second-stage heating.
This kit is only approved for use in systems using either the
ComfortSense
®
7000 thermostat or icomfort
t
thermostat. Wiring modifications shown are in addition to
field wiring detailed in the instructions provided with the air
handler.
Thermostat Configuration
HEAT PUMP APPLICATIONS
The ComfortSense
®
7000 will need to be reconfigured for
use with:
S
Heat pump with hot water heat (see figure 7).
S
Compressor low balance set point of 40ºF.
Since the hot water coil is downstream of the coil, the heat
pump and boiler can be operated simultaneously. In
emergency heat mode, the blower CFM drops to the lower
heat table CFM setting.
AIR CONDITIONER APPLICATIONS
In applications with condensing units, configure
ComfortSense
®
7000 for hot water heat (see figure 7).
In icomfort
t
-enabled systems, see figure 7 for heat
discovery procedures and the icomfort
t
thermostat
installer guide to configure the thermostat.
Kit Installation
This kit can be installed for any of the following variations:
S
Air handler - hot water heat and air conditioner
S
Air handler - hot water heat and heat pump
FREEZESTAT INSTALLATION
Since the hot water coil is downstream of the indoor a
freezestat will need to be installed to protect the indoor
coil during summer air conditioning operation.
1. All units will require one field-provided properly sized
freezestat (S49) for use with this kit. Order part using
table 1.
