Bryant R-22 Especificaciones descargar pdf (Pagina 36)

SSP-SVX15C-EN

This indicator is usually used to indicate an airside fan

failure.

The RTRM will ignore the closing of this Normally

Open switch for 2 (±1) minutes. This helps prevent

nuisance SERVICE LED indications.

Temperature Tests

NNoottee:: These procedures are not for programmable or

digital models and are conducted with the Zone

Sensor Module electrically removed from the

system.

Test 1 - Zone Temperature Thermistor

(ZTEMP)

This component can be tested by measuring the

resistance between terminals 1 and 2 on the Zone

Temperature Sensor. See Table 12, p. 36 for typical

indoor temperatures, and corresponding resistive

values.

Table 12. Typical indoor temperatures and values

Zone Temperature

Nominal Resistance

50°F or 10.0°C 19.9 Kohms

55°F or 12.8°C 17.47 Kohms

60°F or 15.6°C 15.3 Kohms

Table 12. Typical indoor temperatures and values

(continued)

Zone Temperature

Nominal Resistance

65°F or 18.3°C 13.49 Kohms

70°F or 21.1°C 11.9 Kohms

75°F or 23.9°C 10.50 Kohms

80°F or 26.7°C 9.3 Kohms

85°F or 29.4°C 8.25 Kohms

90°F or 32.2°C 7.3 Kohms

Test 2 - Cooling Set Point (CSP) and

Heating Set Point (HSP)

CCooooll SSPP = Terminals 2 and 3

Range = 100 to 900 Ohms approximate

HHeeaatt SSPP = Terminals 2 and 5

Range = 100 to 900 Ohms approximate

Test 3 - System Mode and Fan Selection

The combined resistance of the MMOODDEE selection switch

and the FFAANN selection switch can be measured

between terminals 2 and 4 on the Zone Sensor. The

possible switch combinations are listed in Table 13, p.

36 with their corresponding resistance values.

Table 13. Test 3 - system mode and fan selection

Resistance Valves(Ohms)

Zone Sensor Unit/Fan

Mode Local Unit Mode Local Fan Mode

2.32K

Off/Auto

Off Auto

4.87K

Cool/Auto

Cool Auto

7.68K

Auto/Auto

Auto Auto

10.77K

Off/On

Off On

13.32K

Cool/On

Cool On

16.13K

Auto/On

Auto On

19.48K

Heat/Auto

Heat Auto

27.93K

Heat/On

Heat On

35.0K

Emergency Heat/Auto Emergency Heat

Auto

43.45K

Emergency Heat/On Emergency Heat

Out of Range (Short)

INVALID/Short

Invalid (CV), Auto (VAV)

Invalid

Out of Range (Open) INVALID/Open Invalid (CV), Off (VAV)

Invalid

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