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Honeywell Tradeline Q674A-E, Руководство по установке, Страница: 9 / 12

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9

60-1165—6

9. Firmly tighten the mounting screw.

10. If the HEAT and COOL levers are to be locked in

place at a specific temperature, use the two insulated head
screws supplied instead of the two adjustable lever stop
brackets.

CAUTION

Do not use standard screws that provide metal-to-
metal contact with the stop brackets. Short circuit
and potential equipment damage may result.

Fig. 19—Installing brass insert.

LED WINDOW

BRASS INSERT

INSERT HOLE

BACK OF
THERMOSTAT

M955A

Fig. 20—Installing stop brackets.

MOUNTING THE THERMOSTAT

1. Remove the thermostat cover by pulling the bottom

edge of the cover upward until it snaps free of the cover clip.

NOTE: The cover is hinged at the top and must be removed

by pulling up at the bottom.

2. Carefully remove and discard the polystyrene packing

insert that protects the mercury switches during shipment.

3. Turn over the thermostat base and note the spring

fingers that engage the subbase contacts. Make sure the
spring fingers are NOT bent flat, preventing proper electri-
cal contact with the subbase.

4. Set the adjustable heat anticipator indicators to the

respective current setting for each stage. See Setting the
Heat Anticipator section.

5. Note the two tabs on the top inside edge of the

thermostat base. The tabs fit into corresponding slots on top
of the subbase. Mount the thermostat on the subbase.

6. Align the two captive mounting screws in the ther-

mostat base with the posts on the subbase. See Fig. 21.
Tighten both screws. Do not overtighten screws or damage
to subbase posts can result.

Fig. 21—Mounting thermostat on subbase.

Settings

SETTING THE HEAT ANTICIPATOR

Move the indicator  to match the current rating of the

primary contro. See Fig. 22. When using the T874 Thermo-
stat with two stages of heating, set each heat anticipator to
match its respective primary control current draw. If you
cannot find the current rating on the primary control, or if
further adjustment is necessary, see NOTE and use the
following procedure to determine the current draw of each
stage.

The current draw must be measured with the thermostat

removed from the subbase and the power on to the heating
system.

1. Connect an ac ammeter of appropriate range between

the heating terminals of the subbase:

Stage 1: between W1 and RH or R.
Stage 2: between W2 and RH or R.

HEAT
LEVER

HOLES FOR INSULATED
LOCKING LEVER SCREWS

COOL
LEVER

HOLE WITH
BRASS INSERT

BRACKET
TABS

ADJUSTABLE
LEVER STOP
BRACKETS

BRACKET
SLOTS

MOUNTING 
SCREW

M18682

Содержание Tradeline Q674A-E

Страница 1: ...age 2 To prevent interference with the thermostat linkage keep wire length to a minimum and run wires close as possible to the subbase 3 Do not overtighten thermostat captive mount ing screws because damage to subbase threads can result 4 Do not short across coil terminals on heating relay or gas control This can burn out the thermostat heat anticipator IMPORTANT Thermostats are calibrated at the ...

Страница 2: ...t the system wires to the subbase as shown in Figs 8 through 16 A letter code is located near each terminal for identification The terminal barrier permits straight or conventional wraparound wiring connections See Fig 4 Fig 4 Wiring connections 2 Your Q674 Subbase can require one or more jumpers that may or may not be factory supplied Refer to the wiring diagrams for specific terminals to be jump...

Страница 3: ...he T874D Thermostat is shown with the subbases Thisthermostat subbaseprovides2 stageheat ing and 2 stage cooling connections If using another model see Fig 16 and Table 4 TABLE 4 THERMOSTAT BULB CONFIGURATOIN Model No Heating Bulbs Cooling Bulbs T874A H1 C1 T874B H1 C1 C2 T874C H1 H2 C1 T874D H1 H2 C1 C2 T874E C1 C2 T874F H1 H2 Fig 7 For nonadjacent terminals use jumper supplied with subbase TABLE...

Страница 4: ...FF COOL SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN SWITCH 2 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED JUMPER RH RC FOR SINGLE TRANSFORMER 2 M933C B HEAT CHANGEOVER VALVE L1 HOT L2 1 COOL CHANGEOVER VALVE FAN RELAY COMPRESSOR CONTACTOR 2 COMPRESSOR CONTACTOR 1 1 4 6 8 9 10 11 H2 FALL C2 ANTICIPATOR RISE RISE C1 C2 X1 3 OPTIONAL LED ON SOME MODELS THERM...

Страница 5: ... 6 Fig 10 T874D Q674B in standard heating cooling system with single transformer for heating and cooling Exact replacement for York model no 2TB04700324 Fig 11 T874D E F Q674C in standard heating cooling system ...

Страница 6: ...6 60 1165 6 Fig 12 T874A D F Q674D in standard heating cooling system Fig 13 T874D Q674E in standard heating cooling system ...

Страница 7: ...7 60 1165 6 Fig 14 T874A F Q674G in standard heating cooling system Fig 15 T874C Q674B in standard application ...

Страница 8: ...e locked in place at a specific temperature control point Do not use standard screws that provide metal to metal contact with the lever brackets To install 1 Refer to Fig 20 for screw hole locations 2 Install the two screws with insulated heads in the indicated holes Do not overtighten screws 3 Set the HEAT lever and the COOL lever at desired temperature control points 4 Firmly tighten both screws...

Страница 9: ... each stage See Setting the Heat Anticipator section 5 Note the two tabs on the top inside edge of the thermostat base The tabs fit into corresponding slots on top of the subbase Mount the thermostat on the subbase 6 Align the two captive mounting screws in the ther mostat base with the posts on the subbase See Fig 21 Tighten both screws Do not overtighten screws or damage to subbase posts can res...

Страница 10: ... controlled by the thermostat Cooling system is off COOL Cooling system is automatically controlled by the thermostat Heating system is off FAN SWITCH ON Fan operates continuously AUTO Fan operates with cooling equipment as con trolledbythethermostatorwiththeheatingequip ment as controlled by the plenum switch To move the subbase switches to the desired control positions use thumb and index finger...

Страница 11: ...s the mounting slots 2 Set the thermostat cover on a table near an accurate thermometer 3 Allowtenminutesforcoverthermometertosensearea temperature compare the readings Be careful not to touch the thermometer or breathe on it 4 If the readings are the same replace cover and put the system into operation 5 If the readings are different insert a small screwdriver in the thermometer slot Fig 24 and t...

Страница 12: ...ww honeywell com yourhome Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 ...

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