Model Hfh 2000 Bi Metal Thermostat; Installation & Operation - Atwood AFS Series Training Manual

Model HFH 2000 Bi Metal Thermostat

 Disconnect electricity to the appliance before installation or service. Reconnect then
through.
 DO NOT short control terminals at appliance t test system. The room thermostat will
be damaged
 DO NOT locate thermostat in a humid area. The life expectancy will be reduced.
 Wiring must conform to local codes and ordinances.
 When appliances have time delay controls the system operation will lag behind the
thermostat call for heat.
DESCRIPTION
The HFH-2000 Room Thermostat controls a gas heating system. It senses the room temperature and automatically opens or
closes the ignition circuit to the valve or a relay in a heating appliance.
There are two main assemblies, a cover and a base. The cover has a decorative face and comes with a thermometer. The
temperature scales are Fahrenheit and Celsius. There are four internal ribs which fit into guides in the base for centering and
holding the cover to the base.
The base mounts to the wall with two #6 screws. Leveling is not required for the unit to function. The system wiring is connected to
the thermostat with two screws provided on the back of the base. On the base face side is located the bimetal coil, a magnet,
contacts, adjustable anticipator, a temperature setting lever and an "OFF" switch. The thermostat can be adjusted for more even
heat; the thermostat heat anticipator can be set. The lever at the base of the thermostat is used to set the temperature to the
desired comfort level. Starting from the left side with the coolest setting and increasing temperature setting as you move to the right
as indicated by the increase in bar height shown on the thermostat cover.
Color – White Part No. 38453
Color – Brown Part No. 38452
Electrical Rating 24 VAC volt nominal (30 VAC 1.0 AMP maximum 12 VDC nominal
Application Two wire heating only
Anticipation 0.1 to 1.0 AMP adjustable
Temperature range 50°F to 90°F, 10°C to 30°C
Temperature differential 4°F, 2°C
Size 3" X 3-1/8" X 1-1/2" approximately
INSTALLATION & OPERATION
For accurate temperature control and comfort, correct location is very important.
New Installation – Thermostat Location
 Locate the thermostat on an inside wall about 48" – 54" above the floor, where it is easy to install and adjust it should be in a
room that is used often, such as a living room.
 DO NOT install the thermostat where there are unusual heating conditions such as direct sunlight, close to a lamp, radio,
television, radiator, register, near a fireplace or other heat producing appliance.
 DO NOT locate in unusual cooling conditions, such as on the outside wall, or one separating an unheated room, or in drafts
from stairwells doors or windows.
 DO NOT locate in a damp or humid area. This can shorten thermostat life due to corrosion.
 DO NOT locate where air circulation is poor, such as in a corner, alcove or behind an open door.
 DO NOT install unit until all construction work and painting have been completed.
Replacement Installation – Thermostat Location
When replacing an old thermostat, install the new one in the same location unless the above conditions suggest are otherwise.
WARNING
PRODUCT DAMAGE
SPECIFICATION – MODEL 1H1C
25