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148 RT-SVD03L-EN
Verification of the RH setpoint can be determined by
measuring the dc voltage at TB1 and TB2 on the RTOM.
Table 100. Verification of humidity setpoint
Setpoint (%) Voltage (vdc)
40 0
41 0.238
42 0.455
43 0.652
44 0.833
45 1
46 1.15
47 1.3
48 1.43
49 1.55
50 1.67
51 1.77
52 1.88
53 1.97
54 2.06
55 2.14
56 2.22
57 2.3
58 2.37
59 2.44
60 2.5
Calculation to convert mA to RH = (mA reading - 4) *
6.25
4mA = 0%
20mA = 100%
Example: (12mA - 4) * 6.25 = 50% RH
To measure the mA input current from the humidity
sensor, disconnect sensor wire that is connected to
terminal 18 of LTB. Connect amp meter in series with
the wire and terminal 18 of the LTB.
Table 101. Humidity sensor measurements
mA %
4 0
5 6.25
6 12.5
7 18.75
8 25
9 31.25
10 37.5
11 43.75
12 50
13 56.25
14 62.5
15 68.75
16 75
17 81.25
18 87.5
19 93.75
20 100
Dehumidification/reheat is disabled if any of these
conditions exist:
• Active unit mode = Off with zone sensor
• Humidistat active OPEN from humidity stat
• Active humidity < Active humidity set point –5%
• Outdoor air temperature < 40º F or Invalid or >
100ºF and 1 compressor
• Compressor 1 (or 2 for multi-compressor units)
Auto or manual reset lockout
• Active call for heating
• Slave mode is active and requesting the supply fan
off.
• Dehumidification setpoint is set to 0% (Tracer®
Override)
• If using a zone sensor and unit mode is set to
manual/heat and active zone temp > or equal to
active zone cool setpoint
• If using a zone sensor and unit mode is set to
manual/cool and active zone temp < active zone
heat se 0.5º F.
Modulating Dehumidification
with Hot Gas Reheat (27.5 to 50
Tons)
Controls Overview
• Reheat LPC (RTDM input)
• Manual lockout after four trips.
• Additional 60# low pressure cutout ignored for the
first 10 minutes of compressor run time in reheat
mode.
• Will also be active during service test.
• Two modulating valves are controlled by the
leaving unit temperature sensor
• Cooling mode: Cooling valve 100% open, Reheat
valve 0% open.
• Reheat mode: Cooling and reheat valves open/close
inverse of each other. Reheat valve allowed to
operate from 15 to 85% open.
• Reheat pump out solenoid
• Energized when in cooling mode. It is inactive in all
other modes.
• A three minutes purge cycle will take place after
one continuous hour (hard coded) of operation in
reheat or cooling mode.
• Entering evaporator temperature (overrides
Frostat
™ during reheat)
• During reheat operation if the temp is below 35º F
for 10 minutes the control will shed compressors
(or circuits).
• The unit will not be allowed to stage up until
leaving reheat.
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