RT-SVX073A-EN
169
Service and Maintenance
WARNING
Hazardous Voltage and Exposure to
Ultraviolet Radiation!
This product contains components that emit high-
intensity ultraviolet (UV-C) radiation which can be
harmful to unprotected eyes and skin, and cause
serious damage to the equipment.
Failure to disconnect power before servicing could
result in burns or electrocution which could result in
death or serious injury.
Disconnect all electrical power, including remote
disconnects, and make sure the UV lights are off
before servicing. Follow proper lockout/tagout
procedures to ensure the power cannot be
inadvertently energized.
Trane does not recommend field installation of
ultraviolet lights in its equipment for the intended
purpose of improving indoor air quality. Trane accepts
no responsibility for the performance or operation of
our equipment in which ultraviolet devices were
installed outside of the Trane factory or its approved
suppliers.
Table 67. Control settings and time delays
Control
Description
Elec.
Designation
Contacts
Open
Contacts
Closed
Combustion
Airflow Switch
(Gas Heat
Only)
4S25 see note 1
0.1 - 0.25" wc rise
in press diff
Supply Airflow
Switch (Gas
Heat Only)
4S38
0.03 - 0.12"
wc
0.15 + 0.05" wc
rise in press diff
Freezestat
(Hydronic Heat
Only)
4S12
(N.O.) Auto
Reset
40°F
Pre-purge
Timer:
Honeywell
(Gas Heat)
4U18
internal timing
function
2 Stage 850/1100
MBH 60—
seconds/All other
configurations—
30 seconds
Sequencing
Time Delay
Relay (Gas
Heat)
4DL6
N.C. - timed
to close
60 seconds + 20%
Note: The combustion airflow switch (4S25) differential is 0.02" - 0.08"
wc.
Table 68. Gas heat—high limit
Tons
Fan Size (in) Config.
Contacts
Open
Close
2500 MBh High Limit
120-150
40 DF 220 180
40 HZ 340 300
32 DF & HORZ 240 220
1800 MBh High Limit
120-150
32 &40 DF 240 200
32 &40 HZ 220 180
90-105
32 DF & HZ 240 200
36 DF & HZ 240 200
1100 MBh High Limit
120-150
32 DF & HZ 240 200
40 DF & HZ 240 200
90-105
32 DF & HZ 240 200
36 DF & HZ 220 180
850 MBh High Limit
90-105 32 &36 DF & HZ 195 155
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