Honeywell T874A-F manual

1
2
3
4
5
6
7
8
9
10
11
12

Go to page of

A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of Honeywell T874A-F, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Honeywell T874A-F one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of Honeywell T874A-F. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of Honeywell T874A-F should contain:
- informations concerning technical data of Honeywell T874A-F
- name of the manufacturer and a year of construction of the Honeywell T874A-F item
- rules of operation, control and maintenance of the Honeywell T874A-F item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Honeywell T874A-F alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Honeywell T874A-F, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Honeywell service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Honeywell T874A-F.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the Honeywell T874A-F item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    1 60-1165—6 Q674 Switch Positions Model System Fan A Heat-Auto-Cool Auto-On B Heat-Off-Cool Auto-On C Off-Auto Auto-On D None None E Off-Heat-Auto-Cool Auto-On G Off-Auto None T874A-F Multistage Thermostats/Q674A-E,G Subbases TRADELINE ® Installation Instructions for the Trained Service Technician. Operation On a 2-heat thermostat, the two stage[...]

  • Page 2

    2 60-1165—6 Fig. 1—Installation of subbase on outlet box. 2. Pull electrical wires through the cover plate (if use d) and subbase cable opening (Fig. 3). See Wiring the Subbase section before pulling any wires. IMPORTANT: Use 18 gauge, color-coded thermostat cable for proper wiring. For a wall installation, hold subbase in position and mark hol[...]

  • Page 3

    3 60-1165—6 3. Firmly tighten each terminal screw. 4. Fit wires as close as possible to the subbase. Push exc ess wire back into the hole. 5. Plug hole with nonflammable insulation to prevent drafts from affecting the thermostat. Fig. 5—Jumper RC and RH for single trans- former system. Strip wire 3/4 in. [19 mm]. Fig. 6—Jumper adjacent termin[...]

  • Page 4

    4 60-1165—6 Fig. 8—T874A-D/Q674A in standard heating/cooling system. Fig. 9—T874C,D/Q674B in standard heating/cooling system with separate transformers for heating and cooling. H1 FALL L1 (HOT) L2 1 RH W1 W2 O G Y2 Y1 RC HEAT RELAY 2 HEAT RELAY 1 HEAT OFF COOL SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN SWITCH 2 1 POWER SUPPLY. PR[...]

  • Page 5

    5 60-1165—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.[...]

  • Page 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.[...]

  • Page 7

    7 60-1165—6 Fig. 14—T874A-F/Q674G in standard heating/cooling system. Fig. 15—T874C/Q674B in standard application.[...]

  • Page 8

    8 60-1165—6 Fig. 16—Typical Q674 terminal designations. The thermostat and subbase used determines the number of system components controlled. TEMPERATURE LEVER STOPS Some thermostats have factory-installed temperature lever locking screws (Fig. 17) and/or stop brackets (Fig. 18). Use these only if the HEAT and COOL tempera- ture set point leve[...]

  • Page 9

    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 poten[...]

  • Page 10

    10 60-1165—6 2. Move the system switch to AUTO or HEAT (if used) . 3. After one minute, read the ammeter and record the reading: Stage 1: __________ amperes. Stage 2: __________ amperes. NOTE: If equipment cycles too fast, set the indicator to a higher current rating, not more than one-half division at a time, and recheck cycle rate. Most convent[...]

  • Page 11

    11 60-1165—6 Calibration THERMOSTAT T874 Thermostats are accurately calibrated at the factory. They do not have provision for field calibration. THERMOMETER The thermometer in the thermostat has been accurately calibrated at the factory. The thermometer should need ad- justment only if it has been dropped or shifted due to mishan- dling. If the s[...]

  • Page 12

    12 60-1165—6 www.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[...]