Carrier WeatherMaster 48HC Series - Page 50

50
*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.
Fig. 69 — Single Enthalpy Curve Boundaries
Table 18 — Enthalpy Operation with DCV (CO
2
Sensor) — 1 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I Y2-I
FAN
SPEED
Y1-O Y2-O OCCUPIED UNOCCUPIED
Below CO
2
set
No
Off Off High 0-v/Off 0-v/Off VENTMIN Closed
On Off High 24-v/On 0-v/Off VENTMIN Closed
On On High 24-v/On 24-v/On VENTMIN Closed
Yes
Off Off High 0-v/Off 0-v/Off VENTMIN Closed
On Off High 0-v/Off 0-v/Off
VENTMIN to
Full-Open
Closed to
Full-Open
On On High 24-v/On 0-v/Off†
VENTMIN to
Full-Open
Closed to
Full-Open
Above CO
2
set
No
Off Off High 0-v/Off 0-v/Off
VENTMIN to
VENTMAX
Closed
On Off High 24-v/On 0-v/Off
VENTMIN L to
VENTMAX
Closed
On On High 24-v/On 24-v/On
VENTMIN H to
VENTMAX
Closed
Yes
Off Off High 0-v/Off 0-v/Off
VENTMIN L to
VENTMAX
Closed
On Off High 0-v/Off 0-v/Off
VENTMIN to
Full-Open
Closed to
Full-Open
On On High
DELAY*
24-v/On
0-v/Off†
VENTMIN to
Full-Open
Closed to
Full-Open
ECONOMIZING
AVAILABLE
NOT AVAILABLE
ENTHALPY
RA HUM (%RH)
RA TEMP
TEMPERATURE
ABSOLUTE HUMIDITY
ES5
ES4
ES3
ES2 ES1
HL
P1
(T,RH)
P2 (T,RH)
SINGLE ENTHALPY
DUAL ENTHALPY
HIGH LIMIT
Table 19 — Single Enthalpy and Dual Enthalpy High Limit Curves
ENTHALPY
CURVE
TEMP. DRY
BULB (F)
TEMP.
DEWPOINT (F)
ENTHALPY
(btu/lb/da)
POINT P1 POINT P2
TEMP. (F)
HUMIDITY
(%RH)
TEMP. (F)
HUMIDITY
(%RH)
ES1 80 60 28.0 80 36.8 66.3 80.1
ES2 75 57 26.0 75 39.6 63.3 80.0
ES3 70 54 24.0 70 42.3 59.7 81.4
ES4 65 51 22.0 65 44.8 55.7 84.2
ES5 60 48 20.0 60 46.9 51.3 88.5
HL 86 66 32.4 86 38.9 72.4 80.3
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