Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28 Installation And Service Instructions Manual page 42
Single package rooftop units electric cooling/gas heating with electromechanical controls and puron (r-410a) refrigerant
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Also See for SINGLE PACKAGE ROOFTOP UNITS 48PG20-28:
- User's information manual (11 pages) ,
- Controls, start-up, operation, service and troubleshooting instructions (112 pages) ,
- User's information manual (10 pages)
Table of Contents
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CONTROL
CONTROL POINT
CURVE
A
B
C
D
Fig. 28 — EconoMi$er IV Controller Potentiometer
and LED Locations
APPROX. °F (°C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
60
(16)
A
55
(13)
B
50
C
(10)
D
45
(7)
40
(4)
35
(2)
35
40
45
50
55
60
(2)
(4)
(7)
(10)
(13)
(16)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
Fig. 27 — Enthalpy Changeover Set Points
85
90
95
(29)
(32)
(35)
80
(27)
75
(24)
70
(21)
65
(18)
A
B
C
D
65
70
75
80
85
90
95
(18)
(21)
(24)
(27)
(29)
(32)
(35)
CO SENSOR MAX RANGE SETTING
6000
5000
4000
3000
2000
1000
0
2
DAMPER VOLTAGE FOR MAX VENTILATION RATE
Fig. 29 — CO
42
100
105
110
(38)
(41)
(43)
HIGH LIMIT
CURVE
100
105
110
(38)
(41)
(43)
2
3
4
5
6
7
Sensor Maximum Range Setting
2
800 ppm
900 ppm
1000 ppm
1100 ppm
8
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Troubleshooting
