Trane Fan-Powered Low-Height Parallel Instalační manuál stáhnout pdf (Strana 3)

3

VAV-SVX02B-EN

Thermostat

Specifications

TP970 Series Pneumatic T-stats

Maximum Safe Air Pressure:

25psi (172 kPa)

Maximum Safe Air Temperature:

150°F (66°C)

Throttling Range:

2–10°F (1–5°C)

Gain:

2.5 psi/°F Adjustable

Operation

Pneumatic thermostats modulate

output air pressure in response to room

air temperature. Pneumatic thermo-

stats fall into two categories: direct-

acting or reverse-acting. This section

describes how thermostat output

pressure responds to changes in room

temperature.

Figure 3 graphically illustrates the

relationship between room

temperature and output pressure of a

direct-acting thermostat. The graph in

Figure 3 shows that as the room

temperature increases, so does the

output pressure of the thermostat.

Figure 4 illustrates the pressure/

temperature characteristics for a

reverse-acting thermostat. As room

temperature increases, the thermostat

output pressure decreases.

A thermostat in proper working order

will be able to output a pressure

ranging from approximately .5 psi to

supply air pressure depending on

distance from indicated setpoint.

Figure 4–Reverse-Acting

Thermostat Response

Output Pressure

Input

Input

Temperat

emperat

ure

Figure 3–Direct-Acting

Thermostat Response

Output Pressure

Input Temperat

emperat

ure

1 2 3 4 5 6 7 8 ... 15 16

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