Lennox 90W84 Installation Instruction

E2012 Lennox Industries Inc.
Dallas, Texas, USA
INSTALLATION INSTRUCTION FOR HOT WATER HEAT KIT (90W84)
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
Part Names
Number
DC Relay, 22VDC
3PDT Relay
Delay-On-Make Relay
90W84
9-Pin Wiring Harness
Wiring Diagram
10/2012
*2P102012*
KITS COMMON TO AIR HANDLERS
506944-01
10/2012
Supersedes 2/2012

Field-Provided Supplies

The following field-provided supplies may be required.
S
S

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
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
use with:
S
S
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
ComfortSense
In icomfortt-enabled systems, see figure 7 for heat
discovery procedures and the icomfortt thermostat
installer guide to configure the thermostat.

Kit Installation

This kit can be installed for any of the following variations:
S
S
Part
Qty.
Numbers

FREEZESTAT INSTALLATION

102297-01 1 Since the hot water coil is downstream of the indoor a
freezestat will need to be installed to protect the indoor
67K6601 1
coil during summer air conditioning operation.
99P41 1
1. All units will require one field-provided properly sized
609345-01 1
537516-01 1
Page 1
HOT WATER HEAT KIT
1/4" quick connects
Control wiring (various lengths)
®
7000 thermostat
®
7000 will need to be reconfigured for
Heat pump with hot water heat (see figure 7).
Compressor low balance set point of 40ºF.
applications with condensing
®
7000 for hot water heat (see figure 7).
Air handler - hot water heat and air conditioner
Air handler - hot water heat and heat pump
freezestat (S49) for use with this kit. Order part using
table 1.
*P506944-01*
LITHO U.S.A.
or icomfortt
units, configure
506944-01