Reznor RXH (Outdoor PreevA) Unit Installation Manual - Manual (Page 31)

Form I-RDH/REH/RHH/RXH (12-14), P/N 215210 R14, Page 31
FIGURE 24B -
Economizer
Logic Module
Setpoint and
LED Locations
Exhaust Fan Setpoint
LED lights when exhaust fan is on.
Minimum Damper Position Setting
Maximum Damper Demand Control Ventilation Setpoint
LED lights when Demand Control is above the setpoint.
Demand Control Ventilation Setpoint
LED lights when outdoor air is suitable for free cooling.
Enthalpy Changeover Setpoint
FIGURE 24C - Partial
Psychometric Chart
for Setting Economizer
Logic Module
(Reprinted with
permission from
Honeywell)
CONTROL
CURVE
A
B
C
D
CONTROL POINT
APPROX. °F (°C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
90 10
0
80
70
60
50
40
30
20
10
ENTHALPY—BTU PER POUND DR
Y AIR
85
(29)
90
(32)
95
(35)
100
(38)
105
(41)
110
(43)
35
(2)
35
(2)
40
(4)
40
(4)
105
(41)
110
(43)
45
(7)
45
(7)
50
(10)
50
(10)
55
(13)
55
(13)
60
(16)
60
(16)
65
(18)
65
(18)
70
(21)
70
(21)
75
(24)
75
(24)
80
(27)
80
(27)
85
(29)
90
(32)
95
(35)
100
(38)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
A
A
B
B
C
C
D
D
M11160C
RELA
TIVE HUMIDIT
Y
(%)
1
1
HIGH LIMIT CURVE FOR W7210D, W7212, W7213, W7214, W7340B.
• Option GE21 - Use this chart to set
economizer logic module.
• Option GE22 - Set economizer logic
module to “D” as shown on chart.
6.5 Optional
Evaporative
Cooling Module
(factory installed)
6.5.1 Supply and Drain Water Connections
The evaporative cooling module is factory-installed as the “entering air” cabinet on the
system base. The evaporative cooling module must be connected to a water supply
and to a drain.
Depending on how it was ordered, the cooler has either a recirculating float and pump
water control system (Option ECD2) or an AquaSaver microprocessor timed water
control system (Option ECD1). All coolers are equipped with 12” cellulose or glass fiber
media and may have optional 1” or 2” aluminium pre-filters.