Carrier WeatherMaster 48HC Series Installation Instructions Manual page 50

DEMAND
CONTROLLED
VENTILATION (DCV)
Below CO set
2
Above CO set
2
*With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec-
ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.
†With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2–O after the delay if the call for Y1–I and
Y2–I have not been satisfied.
ECONOMIZING
AVAILABLE
NOT AVAILABLE
TEMPERATURE
ENTHALPY TEMP. DRY
CURVE BULB (F)
ES1
ES2
ES3
ES4
ES5
HL
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Table 18 — Enthalpy Operation with DCV (CO
OUTSIDE AIR
GOOD TO Y1-I Y2-I
ECONOMIZE
Off Off
On Off
No
On On
Off Off
On Off
Yes
On On
Off Off
On Off
No
On On
Off Off
On Off
Yes
On On
Fig. 69 — Single Enthalpy Curve Boundaries
Table 19 — Single Enthalpy and Dual Enthalpy High Limit Curves
TEMP.
DEWPOINT (F)
80 60
75 57
70 54
65 51
60 48
86 66
search engine
Sensor) — 1 Speed Fan
2
FAN
Y1-O Y2-O
SPEED
High 0-v/Off 0-v/Off
High 24-v/On 0-v/Off
High 24-v/On 24-v/On
High 0-v/Off 0-v/Off
High 0-v/Off 0-v/Off
High 24-v/On 0-v/Off†
High 0-v/Off 0-v/Off
High 24-v/On 0-v/Off
High 24-v/On 24-v/On
High 0-v/Off 0-v/Off
High 0-v/Off 0-v/Off
DELAY*
High 0-v/Off†
24-v/On
POINT P1
ENTHALPY
(btu/lb/da)
TEMP. (F)
28.0 80
26.0 75
24.0 70
22.0 65
20.0 60
32.4 86
50
OCCUPIED UNOCCUPIED
VENTMIN
VENTMIN
VENTMIN
VENTMIN
VENTMIN to
Full-Open
VENTMIN to
Full-Open
VENTMIN to
VENTMAX
VENTMIN L to
VENTMAX
VENTMIN H to
VENTMAX
VENTMIN L to
VENTMAX
VENTMIN to
Full-Open
VENTMIN to
Full-Open
DUAL ENTHALPY
HIGH LIMIT
SINGLE ENTHALPY
P2 (T,RH)
P1
(T,RH)
ES4 ES2
ES5 ES3
POINT P2
HUMIDITY
TEMP. (F)
(%RH)
36.8 66.3
39.6 63.3
42.3 59.7
44.8 55.7
46.9 51.3
38.9 72.4
Closed
Closed
Closed
Closed
Closed to
Full-Open
Closed to
Full-Open
Closed
Closed
Closed
Closed
Closed to
Full-Open
Closed to
Full-Open
ES1
HL
HUMIDITY
(%RH)
80.1
80.0
81.4
84.2
88.5
80.3