Honeywell TROL-A-TEMP T874D User's Manual

Honeywell Thermostats User's Manual - TROL-A-TEMP T874D.
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S. M.  •  Rev. 6-93  •          •  ©Honeywell Inc. 1993  •  Form Number 69-0580—2

M3375

T874A,D Zone Thermostats/

Q674B,D,E Subbases

TABLE 2—THERMOSTAT/SUBBASE SPECIFICATIONS.

Thermostat/

Anticipator Range (A)

Thermostat/Subbase

Switching

Subbase

Heating

Cooling

Order Number

a

System

Fan

Color

(Adj.)

(Fixed)

T874A1465/Q674B1471 HEAT-OFF-COOL

ON-AUTO

White/Gray

Stg. 1—

Stg. 1—

T874A1465/Q674D1123 None

None

White/Gray

0.1 to 1.2

0 to 1.5

T874A1465/Q674E1379 HEAT-OFF-COOL-AUTO ON-AUTO

White/Gray

T874D1801/Q674B1463 HEAT-OFF-COOL

ON-AUTO

Beige/Brown

Stg. 1—

Stg. 1—

T874D1827/Q674B1471 HEAT-OFF-COOL

ON-AUTO

White/Gray

0.1 to 1.2;

0 to 1.2;

T874D1801/Q674D1115 None

None

Beige/Brown

Stg. 2—

Stg. 2—

T874D1827/Q674D1123 None

None

White/Gray

0.1 to 1.0.

0 to 1.0.

T874D1827/Q674E1379 HEAT-OFF-COOL-AUTO ON-AUTO

White/Gray

a Subbase not included with thermostat; order separately.

Operation

On a 2-heat thermostat, the two stages of heat make

sequentially as the temperature drops. Make refers to the
mercury switch initiating a call for heat or cool.

There are about 2

° F [1° C] between stages so that the

second stage makes only when the first stage cannot
handle the load. This is the interstage differential.

Recycling Notice

This control contains mercury in a sealed tube. Do not

place control in the trash at the end of its useful life.

If this control is replacing a control that contains mercury

in a sealed tube, do not place your old control in the trash.

Contact your local waste management authority for

instructions regarding recycling and the proper disposal of
this control, or of an old control containing mercury in a
sealed tube.

If you have questions, call Honeywell at 1-800-468-1502.

M3375

Installation Instructions for the Trained Service Technician.

TABLE 1—THERMOSTAT/SUBBASE AND SYSTEM COMPATIBILITY.

Thermostat/

Application

Subbase Model

Number

a

Mini-Zone

Mabs II, Mabs II-L

Mabs XX

Stages

T874A/Q674B

Zone 1; conventional

Zone 1; conventional

Any zone; conventional heat-cool. Single-stage

heat-cool.

heat-cool.

T874A/Q674D

Zones other than zone 1;

Zones other than zone 1;

Not applicable

Single-stage

conventional heat-cool.

conventional heat-cool.

T874A/Q674E

Not applicable

Not applicable

Any zone; conventional heat-cool. Single-stage

T874D/Q674B

Not applicable

Zone 1; conventional

Any zone; conventional heat-cool. Multistage

heat-cool.

T874D/Q674D

Not applicable

Zones other than zone 1;

Not applicable

Multistage

conventional heat-cool
and heat pump.

T874D/Q674E

Not applicable

Not applicable

Any zone; conventional heat-cool. Multistage

a Subbase not included with thermostat; order separately.

Application

These T874A,D Zone Thermostats and Q674B,D,E

Subbases provide 24 to 30 Vac temperature control in
Honeywell Trol-A-Temp heating/cooling zone systems.

See Table 1 for thermostat/subbase and system compatibil-
ity; see Table 2 for thermostat specifications. For complete
Honeywell Trol-A-Temp System specification and appli-
cation information, refer to the system specification in-
cluded with the control panel.

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