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Honeywell T641A, Installation Instructions Manual, Page: 3 / 6

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Honeywell T641A Installation Instructions Manual Download Page 3

3

62-0101

Fig. 3—Thermostat components and leveling procedure

80
70
60
50

WARM

COOL

HONEYWELL PART NO. 221618

ACCESSORY WALLPLATE

THERMOSTAT BASE

MOUNTING

SCREWS (4)

THERMOSTAT COVER

M6111

EXTERNAL
SET POINT LEVER

Fig. 4—Mounting T641 using the accessory wallplate.

Y

C

X

W

R

80

70

60

50

OFF

ON

SYSTEM OVERRIDE

;;;;;

SPIRIT LEVEL

WALLPLATE

HEATING
CONTACT

MOUNTING
HOLES (4)

COOLING
CONTACT

INTERNAL
SET POINT
LEVER

MOUNTING
HOLES (4)

WIRING
TERMINAL
(UP TO 5)

M 965

FRONT OF THERMOSTAT

(COVER REMOVED)

BACK OF THERMOSTAT

Summary of Contents for T641A

Page 1: ... is sized to handle an average peak load notthesumoftheindividualpeaks Aseachzonepeaks at a different time of day extra air is borrowed from the off peak zones This transfer from low load to high load zones occurs only in true VAV systems Pressure dependent systems do not incorporate an indi vidual zone air flow sensor and depend on a stable system pressure to maintain flow These systems require s...

Page 2: ... and ordinances The T641 utilizes a four wire opera tion so an additional transformer common wire must be present for correct wiring and operation See Fig 2 for functional schematic of T641 Screw terminals are on the back of the thermostat See Fig 3 Thepartno 221618CoverPlateisavailablewhenreplac ing a competitive device that has left marks on the wall See Fig 4 1 Grasp the thermostat cover at the...

Page 3: ...NG SCREWS 4 THERMOSTAT COVER M6111 EXTERNAL SET POINT LEVER Fig 4 Mounting T641 using the accessory wallplate Y C X W R 80 70 60 50 OFF ON SYSTEM OVERRIDE SPIRIT LEVEL WALLPLATE HEATING CONTACT MOUNTING HOLES 4 COOLING CONTACT INTERNAL SET POINT LEVER MOUNTING HOLES 4 WIRING TERMINAL UP TO 5 M 965 FRONT OF THERMOSTAT COVER REMOVED BACK OF THERMOSTAT ...

Page 4: ...les and tighten 7 Replace the thermostat cover WARNING Because the cooling anticipator operates continu ously in the floating band the T641 incorporates a factory offset that calibrates the thermostat The offset causes the T641 to appear to be switching 10 5 F lower when not powered compared to actual operation The cooling anticipator is needed to provide proper thermostat cycling by matching the ...

Page 5: ...o close Replace the ML6161 if the motor does not run in either direction With the T641 controlling the ML6161 or equivalent actuator lower the set point of the thermostat to call for cooling Observe the operation of the motor If the damper is closed it should begin to open If not adjust the set point of the T641 higher to determine if the wiring is correct If no movement is observed check for the ...

Page 6: ...6 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 6 ...

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