Model 2H2C Digital Thermostat; Furnace Operation; Fan Operation - Atwood 79 Series Service Manual

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ENGLISH, FRANCAIS
THIS THERMOSTAT HAS BEEN DESIGNED TO OPERATE STANDARD AIR CONDITIONING UNITS IN CONJUNCTION WITH AN EXCALIBUR
Screw Mounting Holes
1
12VDC
7.5V
Ground
System Slide Switch
SCROLL ORDER OF
LEFT
RIGHT
DISPLAYED MODES
Scroll Order of Displayed Modes
COOL
OFF
HEAT
FAN
AU
COOL
OFF
HEAT
FAN
Scroll Order of Displayed Modes
AU
Scroll Order of Displayed Modes
COOL
OFF
HEAT
FAN
COOL
OFF
HEAT
FAN
Scroll Order of Displayed Modes
OF
Specifications
Operating Voltage
Power Consumption
Operating Temperature
(et Canada)
2
3
4
5
6
+12VDC
RELAY
A/C
A/C
A/C
COM
COM-
HI
LOW
*
PRESSOR
FAN
FAN
OPERATION

Furnace Operation

Furnace automatically switches between high and low BTU valve and high
and low speed fan when cycling to satisfy set point.
HI
Furnace high BTU valve and high speed furnace fan cycle to satisfy set point.
LO
Furnace low BTU valve and low speed furnace fan cycle to satisfy set point.
HF
Furnace fan runs at high speed to circulate air. Air conditioner fan does not run.
LF
Furnace fan runs at low speed to circulate air. Air conditioner fan does not run.
Air Conditioner Operation
Air conditioner automatically switches compressor and high and low speed fan when
cycling to satisfy set point.
HI
Air conditioner compressor and high speed fan operate to satisfy set point.
LO
Air conditioner compressor and low speed fan operate to satisfy set point.
HF
Air conditioner fan runs at high speed to circulate air. Furnace fan does not run.
LF
Air conditioner fan runs at low speed to circulate air. Furnace fan does not run.

Fan Operation

HI
Air conditioner fan and furnace fan run at high speed to circulate air.
LO
Air conditioner fan and furnace fan run at low speed to circulate air.
Off
No operation occurs.
9VDC to 18VDC
......................
................................
-40F to +185F
..................
Mode
Temperature
Set
Display
Set
(OFF)
OFF
HEAT
(CHAUFFAGE)
M
(CLIM) COOL
FAN (VENTIL.)
System Switch
* Note: Move jumper
from positions 3 and 4 to
7
8
positions 2 and 4 for use
TH FROM
FURNACE
with some 7.5V switching
analog relay kits.
Room Temperature Range
100mA
Room Temperature Display Range
15
Thermostat Accuracy
LITERATURE NUMBER
hydro flame
Two Stage Furnace
Digital Thermostat
FOR TWO STAGE FURNACE
•Installation •Operation
THERMOSTAT INSTALLATION
Thermostat is very sensitive.
HANDLE WITH CARE AT ALL TIMES
Locate thermostat 48˝ to 54˝ above floor on an
Pick a dry area where air circulation is good.
location must have a 3/4˝ spacer between thermostat and
exterior wall.
1. Be sure all electrical power has been disconnected from
the air conditioner, furnace and the power supply.
2. Do not install the thermostat where there are unusual
heating conditions: such as direct sunlight, heat
producing appliances (television, radio, wall lamp, etc.)
or a furnace or air conditioner supply register.
3.
. Separate the thermostat
ATTACHING THE WALL THERMOSTAT
body from the sub-base by gently squeezing the top and
bottom. Pull wires through access hole in base plate.
Attach thermostat sub-base to the wall at the desired
mounting location. Mount the sub-base to the wall before
connecting the wires.
+55F to +90F
..............
+35F to +99F
..
................................
MPD 38914
TM
Model 2H2C
Effective 2/4/02
-
.
2
STAGE FURNACE
.
wall.
INTERIOR
wall
EXTERIOR
+/- 1F

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