Lennox 51M32 - Manual
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Table of Contents:
- Page 2 – Heating Control
- Page 5 – Service Indicator; Thermostat RESET
- Page 6 – IMPORTANT; Thermostat Output Table; NOTE −
- Page 7 – Merit
- Page 11 – Balance Point; Balance Point Setting; Service Indicator Flashing
- Page 12 – Connections
- Page 13 – Service Reminder; OR; LCD Backlight; Activated for 8 seconds when any key is pressed.; Thermostat Operating Conditions
Page 1
®
2003 Lennox Industries Inc.
Dallas, Texas, USA
OPERATION
MANUAL
Merit
R
Series Thermostat
The Lennox Merit
®
Series Thermostat 51M32 is a nonpro-
grammable electronic thermostat that is easy-to-use and
has a large, easy-to-read display and excellent tempera-
ture control. The thermostat also includes a programmable
filter change reminder and a system check indicator. The
system check indicator will notify the user of the need for
equipment service.
Thermostat 51M32 is suitable for non-heat pump, single−
stage heat/single cool applications that are matched with a
gas or electric furnace.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
Introduction
This document describes the operation of Lennox thermostat
51M32. Refer to the installation manual for instructions re-
garding installation and wiring of the thermostat.
Initial Thermostat Power-up
When power is initially applied to the thermostat, the dis-
play will appear as shown in figure 1.
Litho U.S.A.
Merit
®
Series Thermostat
CONTROLS (51M32)
504,865M
09/04
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Table of Contents
Merit
®
Series Thermostat
. . . . . . . . . . . . . . . . . . . . . .
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Thermostat Power-up
. . . . . . . . . . . . . . . . . . . . . .
Heating Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Temperature Setpoint
. . . . . . . . . . . . . . . . . .
Fan Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter Reminder
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Indicator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Thermostat Settings
. . . . . . . . . . . . . . . . . . . . .
Technical Specifications
. . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Output Table
. . . . . . . . . . . . . . . . . . . . . . . .
Display − Initial Power−Up
Figure 1
ROOM
SETPOINT
88
88
FILTER
SERVICE
FAN
ON
AUTO
SYSTEM
COOL
OFF
EMG.
HEAT
All display segments are momentarily activated. This oc-
curs as a normal part of thermostat initialization. Within a
few seconds, the display will appear as shown in figure 2
(figure shows temperature in Fahrenheit units).
"Loading the manual" means you need to wait until the file loads and becomes available for online reading. Some manuals are very large, and the time they take to appear depends on your internet speed.
Summary
Page 2 Display − Home Screen Figure 2 ROOM 70 FAN AUTO SYSTEM HEAT Figure 2 illustrates the HOME screen. Note that an indoorroom temperature of 70°F is initially displayed. After about1 minute of warm−up time, the actual room temperature willbe displayed. HEAT mode is the system default (as indi-cat...
Page 5 Service Indicator When abnormal equipment operation is detected, theSERVICE indicator will flash on the upper-right corner ofthe screen. This indicates that the equipment requires ser-vice from a qualified service technician. The SERVICE indi-cator is shown in figure 13. Figure 13 Service Ind...
Page 6 Equipment Protection Override Both the minimum compressor OFF timer and the mini-mum equipment cycle timer can be over−ridden by press-ing and holding either the HEAT or COOL button down for 4seconds. Over−Temperature Protection Thermal mechanical switch opens W1 at 93°F+/−6°F. Filter Reminde...
