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Accustat Thermostats

The Accustat Temperature Control System

One of the most dependable ways of controlling the temperature is to use a non-adjustable sensor on your controls. Accustat controls feature a factory preset mercury thermometer that does the sensing.

The major advantages are:

  • Factory set
  • Nonadjustable
  • Operates in any position
  • No temperature drift
  • Precalibrated
  • High accuracy
  • Fast response
  • Unaffected by vibration

 

 

ACCUSTAT NONADJUSTABLE SENSORS
S-35 S-55 S-68 S-78
S-37 S-60 S-70 S-80
S-39 S-62 S-72 S-82
S-40 S-64 S-74 S-84
S-45 S-65 S-75 S-86
S-50 S-66 S-76 S-88

ACCUSTAT ADJUSTABLE SENSOR
ORDER # RANGE
AS-90 -40 to 90°F

The wiring enclosure/bases feature an exclusive locking system as standard. Limiter models don’t have any external thermometers or switches to encourage meddling.

The wide variety of models include:

• Single setpoint
• Programmable
• Adjustable
• Digital line volt
• High/Low setpoint
• PTAC controls
• Adjustable with limiter
• Low volt
• Multistage
• Heat pump stats
• Duct limiters
• Millivolt
• Microamp
• Outdoor sensors

The Accustat Sensor
How it Works: Accutherm sensors use a mercury thermometer to sense the ambient temperature. As the temperature rises, the mercury expands and completes a circuit between the two rings on the thermometer. These rings are connected with the mercury column by a platinum wire embedded in the glass tube. These sensors snap into pre-wired holding clips mounted on the thermostat base. The factory preset sensors are completely nonadjustable and can be mounted almost anywhere. They are extremely durable and not normally sensitive to vibration.

 


Digital Line Voltage Energy Control

This new microprocessor based control is designed to provide economic control for zoned baseboard and radiant heating systems. Utilizing a thermistor type sensor, as opposed to a traditional bimetal, this design lends far more precise control over the life of the system. Energy savings can come in as high as 30% by using this control. Batteries are not required. User set points are maintained through power outages of up to 10 seconds. Default set points are factory set at 55˚F for the economy mode and 68˚F for the comfort mode. Single and double pole models are available. Double pole models incorporate a power on/off switch; single pole models do not.

Features:

  • Digital set point display
  • 3 button easy operation
  • Temperature range of 40˚ to 90˚F
  • UL Approved
  • Designed in conjunction with the Electrical Power Research Institute
  • Patented Intella-Sens system ensures stable and precise temperature control, eliminating temperature swings, while preventing rapid cycling.
  • Load rating 22 amps maximum
  • Meets Power Smart‚ guidelines for energy efficiency
  • No batteries required
ORDERING INFORMATION
ORDER # POWER RELAY DEFAULT SET POINT
LV-120HS/55NL 120 VAC Single Pole 55 degrees F
LV-120HS/68NL 68 degrees F
LV-230HS/55NL 208/240 VAC 55 degrees F
LV-230HS/68NL 68 degrees F
LV-240HD/55NL 240 VAC Double Pole 55 degrees F
LV-240HD/68NL 68 degrees F


E-Accustat with Electronic Sensing

The newly designed E-Accustat‚ contains all of the features of the original with the addition of an adjustable electronic temperature sensor. Just turn the stepper to the desired selectable temperature setting, replace the cover and you’re there…dependable and secure temperature control. The cycle rate can also be set over a range of 3 cycles per hour up to 6 cycles per hour. Remote sensing of up to 3 sensors with averaging can be achieved with this series. A setback model is available to provide economy settings, using a remote timer, light sensing device, computer or any device that can activate a 24VAC signal.

Features:

  • Rugged case design
  • Locking Mechanism
  • Solid State Switching
  • Electronic Sensing
  • Averaging of up to 3 sensors
  • Adjustable cycle rate
  • Single or Multiple Stages
  • Dual Set Points
  • Adjustable economy offset (setback)

Specifications:

  • Power: 24V
  • Temp. Range: 65˚ to 80˚ F
  • Rating: 1.2 amps per stage
  • ΔT: 2˚ between stages
ORDERING INFORMATION
ORDER # STAGES SYSTEM SWITCHES FAN SWITCHES REMOTE SENSING
LEMS2-AH11 2-Cool/2-Heat On/Off HT Auto/CL Auto/On
No
LEMS2-AH11-R
Yes
LEMS2-AH22 2-Cool/2-Heat
No
LEMS2-AH22-R
Yes
HEAT PUMP MODULE
LEHP2-AH12 1-Cool/2-Heat EmHt/Heat/Auto/Cool Auto/On No
LEHP2-AH12AS-RD Yes
SETBACK MODEL
LEMS-AHSSAS-HD 2-Cool/2-Heat On/Off HT Auto/CL Auto/On
Yes

ACCESSORIES
ORDER # DESCRIPTION
SRT-3 Remote Sensor for E-Accustat
T24-7 Remote 7 day Programmable Timer for Setback Scheduling (24V)
L24-1 Remote Light Sensor


Energy Guard Limiter Thermostats

Whether heating or cooling, these thermostats can hold the line on temperature abuse.

Energy Guard thermostats do more than just control room temperature. Special sensor(s) concealed inside limit maximum heating and/or minimum cooling room temperatures regardless of where the thermostat is set.Savings can be astronomical—in some cases as much as 50% or more.

Adjustable Thermostat with Built-in Limiter

This wall thermostat features an adjustable (AS-90) sensor and a snap-in limiter clip for a non-adjustable sensor for limiting the setpoint of either heating, cooling or heat/cool stats.

ORDERING INFORMATION
ORDER # SETTINGS SWITCHES
T30H-L 1-heat None
T32AH-L 1-heat / 1-cool Heat-Off-Cool / Fan-Auto-On

Operation:

The limiter sensor overrides at the selected setpoint regardless of where the adjustable sensor is set. This gives thermostats fiddlers a dial to set wherever they want while the actual control is prevented from exceeding your selected limit.

Features:

  • Both adjustable and limited
  • No leveling
  • No thermometer on the cover
  • Standard terminal markings
  • No calibrating
  • No anticipator adjustments


Accustat Thermostat Bases

Accustat wiring bases have pre-wired solid state relays connected to the thermostat mounting clips. These relays perform the desired Heat/Cool switching functions in either 24, 120 or 240Vac circuits, depending on the model you select.

NOTE: The multiple sensor models shown above (LH-2, LA-2, LAH-22) are not multistage. The second sensor is accessible through the high/low switch only and is not automatic. Use for selecting day/night, occupied/unoccupied or any other two-temperature control mode you need. For multistage models, see the LMS order chart below.

ORDERING INFORMATION
ORDER # SETTINGS SYSTEM FAN
LH-1 1 Heat Off-On
LH-2 Hi-Low Heat Low-Off-Hi
LA-1 1 Cool Off-On Auto-On
LA-2 Hi-Low Cool Low-Off-High Auto-On
LAH-11 1 Heat-1 Cool Heat-Off-Cool Auto-On (heat only)
LAH-11E 1 Heat-1 Cool Heat-Off-Cool Auto-On
LAH-22 High-Low Heat
High-Low Cool
Heat-Off-Cool
Low-High
Auto-On (heat only)
LAH-22E High-Low Heat
High-Low Cool
Heat-Off Cool
High-Low
Auto-On


Accustat Multistage Thermostats

Accustat multistage thermostats feature independent sensor/circuits for each stage. Each stage can be individually “fine-tuned” for maximum performance.

Since no anticipator devices are used, a major cause of multistage control inefficiency is eliminated. In the auto changeover mode, the dead band temperature zone is precise and drift free. A minimum dead band of 4° between the first stage heating and cooling is recommended, and 2° minimum between first and second stages where applicable. These thermostats use standard single stage preset sensors. Adjustable sensors are not recommended. order sensor separately.

 

ORDERING INFORMATION
ORDER # STAGES SWITCHES
LMS-H2 2 Heat Off-On
LMS-A2 2 Cool Off-On
LMS-AH11 1 Heat-1 Cool Heat-Auto-Cool
On-Off
LMS-AH22 2 Heat-2 Cool Heat-Off-Auto-Cool
LMS-AH22NS 2 Heat-2 Cool Heat-Auto-Cool
On-Off
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