Accessory List

THC-2, THC-3, THCR-4
266
© Copyright 2006 TAC. All Rights Reserved. F-27382-1
Two-Position Enthalpy Controller
Model Chart
Specifications
This controller provides on-off (two-position) low
voltage control of the amount of air brought into
the cooling system with respect to the “total heat”
(enthalpy) of the outside air. THC-3 and THCR-4
controllers replace Honeywell H250A series.
Features:
• Direct acting and reverse acting applications from all units.
• Long life nylon element.
• 1/2 in. conduit units available.
• Competitive replacement units listed.
• Fail safe design.
Model No.
Control Settings
Replaces Honeywell
Dial Setting 10% RH
20%
RH
50%
RH
80%
RH
THC-2
A
88°F
(31°C)
⎯
83°F (28°C) 74°F (23°C)
⎯
B
83°F
(28°C)
78°F (26°C) 70°F (21°C)
C
78°F
(26°C)
73°F (23°C) 64°F (18°C)
D
73°F
(23°C)
68°F (20°C) 59°F (15°C)
THC-3
A
⎯
78°F (26°C) 73°F (23°C) 68°F (20°C)
⎯
B73°F (23°C68°F (20
°C) 63°F (17°C)
C68°F (20°C) 63°F (17°C) 59°F (15°C)
D62°F (17°C) 58°F (14°C) 53°F (12°C)
THCR-4
A
⎯
78°F (26°C) 73°F (23°C) 68°F (20°C)
H205A-1012
H205A-1061
B73°F (23°C68°F (20°C) 63°F (17°C)
C68°F (20°C) 63°F (17°C) 59°F (15°C)
D62°F (17°C) 58°F (14°C) 53°F (12°C)
Control dial settings Refer to Model Chart. Intermediate settings are available.
Sensing elements
Humidity Nylon ribbon. (Controller will function as a dry bulb control if the nylon element should fail.)
Temperature Bimetal.
Differentials 8% RH (approximately) and 2F degrees (1C degrees).
Environment
Ambient temperature limits
Shipping and storage: -40 to 150
°F (-40 to 65°C).
Operating: 40 to 150°F (4 to 65°C).
Humidity 5 to 95% RH, non-condensing.
Locations NEMA Type 1, Indoor only.
Electrical switch
Snap acting SPDT will run the outdoor air damper to the minimum position whenever the total heat in
the outdoor air renders it unsuitable for cooling.
Rating 100 mA to 2.5 amps at 24 Vac.
THC
-
2
,
THC-3,
THCR-4
A
C
D
TH
C
-
2
B
C
D
TH
C
-
3
D
TH
C
R-
4