62
YORK INTERNATIONAL
Loading/Unloading of cylinders is accomplished in re-
sponse to return chilled water temperature as sensed
by the Micro Logic Board and Cooling Range selection.
A typical example is illustrated below (4 stages).
DUAL CIRCUIT UNITS
STANDARD RETURN WATER TEMPERATURE (RWT) CONTROL
LOADING/UNLOADING
*10°F (5.6°C)
¸
8 stages = 1.25°F (.7°C) between stages of loading.
**If optional 6 or 7 stage loading/unloading is included, Stage 3 loading and unloading is not included on one or both compressor. Therefore, in
the example above, no system response will take place on loading at 50°F (10.0°C) and/or 55°F (12.8°C) and no system response will take
place on unloading at 53.75°F (12.1°C) and 48.75°F (9.3°C).
If optional 6, 7 or 8 stages of unloading is included, typical load-
ing and unloading is illustrated below.
RWT Setpoint
= 55°F (12.8°C)
Cooling Range
= 10°F (5.6°C)
System Switches = Both ON
SYS 1
= LEAD
Sw. 5 on Micro
= ON (Optional 6 or 8 stages of unloading)
Sw. 3 on Micro
= OFF (RWT Control)
RWT Setpoint
= 55°F (12.8°C)
Cooling Range
= 10°F (–12.2°C)
System Switches = Both ON
SYS 1
= LEAD
Sw. 5 on Micro
= OFF
(Typical 4 stages of unloading)
Sw. 3 on Micro
= OFF (RWT Control)
Return Water
Temp. °F (°C)
55 (12.8) -----------
---------
Lag Compressor Loads Stage 2 -------
---------------------------------------
Cooling
52.5 (11.4) ---------
---------
Lag Compressor Starts (Unloaded) --
– Lag Compr. Unloads Stage 2
Range
50.0 (10.00) -------
---------
Lead Compressor Loads Stage 2 -----
– Lag Compressor OFF
*10°F (5.6°C)
47.5 (8.6) ----------
---------
Lead Compressor Starts (Unloaded) -
– Lead Compr. Unloads Stage 2
45 (7.2) -------------
---------
Both Compressor OFF -------------------
– Lead Compressor OFF
*10°F (5.6°C)
¸
4 stages = 2.5°F (1.4°C) between stages of loading.
Temperature
Fall
Temperature
Rise
Return Water
Temp. °F (°C)
55 (12.8) -----------
---------
Lag Compressor Loads Stage 4** ----
-------------------------------------
53.75 (12.1) -------
---------
Lag Compressor Loads Stage 3 -------
– Lag Compr. Unloads Stage 4**
52.5 (11.4) ---------
---------
Lag Compressor Loads Stage 2 -------
– Lag Compr. Unloads Stage 3
Cooling
51.25 (10.7) -------
---------
Lag Compr. Starts (Unloaded) Stage 1
– Lag Compr. Unloads Stage 2
Range
50.0 (10.00) -------
---------
Lead Compressor Loads Stage 4** ---
– Lag Compr. OFF (Stage 1)
*10°F (5.6°C)
48.75 (9.3) ---------
---------
Lead Compressor Loads Stage 3 -----
– Lead Compr. Unloads Stage 4**
47.5 (8.6) ----------
---------
Lead Compressor Loads Stage 2 -----
– Lead Compr. Unloads Stage 3
46.25 (7.9) ---------
---------
Lead Compr. Starts (Unloaded) Stage 1
– Lead Compr. Unloaded Stage 2
45.0 (7.2) ----------
---------
Both Compressors OFF -----------------
– Lead Compr. OFF (Stage 1)
Temperature
Fall
Temperature
Rise
Содержание YCAG18
Страница 11: ...YORK INTERNATIONAL 11 FORM 150 40 NM25 SINGLE CIRCUIT UNITS LD01712 ELEMENTARY DIAGRAM FIG 4 CONTINUED...
Страница 12: ...12 YORK INTERNATIONAL SINGLE CIRCUIT UNITS FIG 4 CONTINUED LD01713 CONNECTION DIAGRAM ELECTRICAL BOX...
Страница 43: ...YORK INTERNATIONAL 43 FORM 150 40 NM25 DUAL CIRCUIT UNITS FIG 29 CONTINUED ELEMENTARY DIAGRAM LD01716...
Страница 44: ...44 YORK INTERNATIONAL DUAL CIRCUIT UNITS FIG 29 CONTINUED CONNECTION DIAGRAM ELECTRICAL BOX LD01717...
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