Intermediate Air Temperature

Refrigerant Discharge Temperature — This tem- perature is used by service personnel to analyze the performance of the refrigeration system.

Ambient Air Temperature — If the ambient air tem- perature falls outside the acceptable range, the dryer may fail to achieve the required dew point or dryer shutdown may result due to high refrigerant discharge pressure.

This temperature is used by service personnel to ana- lyze the performance of the refrigeration system. Inter- mediate air temperature is displayed by putting monitor in Scan mode, then pushing and holding down the TIME ADJUST and CLOSED/OPEN buttons si- multaneously for three seconds. The intermediate air temperature will be displayed for 15 seconds. The digital display will then return to its last temperature readout.

Intermediate air temperature varies with operating condi- tions and ambient air temperature. Table VI lists approxi- mate normal ranges of this temperature at various inlet flows and dew point classes.

Table VI

Intermediate Air Temperature

DRYER INLET	APPROXIMATE NORMAL RANGEa
AIRFLOW	33°F - 39°F	50°F - 60°F
(% of rated	33°F - 39°F	50°F - 60°F
(% of rated	Dew Point	Dew Point
capacity)	Dew Point	Dew Point
capacity)

80-100	35°F - 45°F	50°F - 60°F
50-79	45°F - 55°F	60°F - 70°F
25-49	55°F - 65°F	70°F - 80°F
10-24	65°F - 75°F	80°F - 90°F
No airflow	75°F - 100°F	90°F - 100°F

aBased on 90°F-100°F dryer inlet air temperature and 100°F ambient air temperature. These ranges are approximate and may vary with changes in inlet air pressure, ambient temperature and inlet airflow.

Remote Alarm Contacts (Optional)

Dry (unpowered) contact including one normally open set and one normally closed set are provided to signal remote indication, if the CHECK OPERATING CON- DITIONS or SYSTEM ALARM indicators are acti- vated.

RS-232 Serial Port

The RS-232 serial communications port allows for monitoring of current temperature and error flags. Communication is via a series of ASCII characters

sent every second. The baud rate is 4800, 8 bits, no parity.

Message format:

VERSION	PROGRAM

8S	All Models

8S version:

•:Ixxx,Sxxx,Dxxx,Axxx,Oxxx,Nxxx,Lyy,Syy<cr><lf>

Where:

•“:” = colon character

•“,” = comma character

•<cr> = carriage return

•<lf> = line feed

•xxx = temperature in BCD, leading zeros are suppressed (replaced with

•spaces. Out-of-range values are displayed as “---”.

•yy = alarm bits in ASCII HEX format

Each numerical temperature value is preceded with a single alphabetic identifier:

•I = Inlet air

•S = Suction

•D = Discharge

•W = Water*

•A = Ambient*

•O = Operation

•G = Glycol**

•N = Intermediate**

*Water or Ambient is displayed, based on version.

**Intermediate or Glycol is displayed, based on version.

The alarm bits are preceded with either:

•L = Alarm bits

•S = Service Due indication

The HEX characters that follow “L” or “S” convey an eight-bit field which indicates the source of the alarm or service due indicator. A value of all zeros (0x00) in- dicates that no alarm or service due condition exists.

8	Pyramid 8000® Series Purifiers (Bulletin 289)

8000 specifications

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