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RT-SVX073A-EN
– Exhaust Bypass Dampers - Open (if so equipped)
• PURGE sequence “D”
Possibly this sequence could be used for purging
the air out of a building before coming out of
Unoccupied mode of operation on VAV units or for
the purging of smoke or stale air if required after a
fire.
– Supply Fan - On
– Supply Fan VFD - Max (if so equipped)
– Exhaust Fan - On; Exhaust Dampers - Open (if so
equipped)
– OA Dampers - Open; Return Damper - Closed
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output - Energized
– VOM Relay - Energized
– Preheat Output - Off
– Return Fan - On; Exhaust Dampers - Open (if so
equipped)
– Return VFD - Max (if so equipped)
– OA Bypass Dampers - Open (if so equipped)
– Exhaust Bypass Dampers - Open (if so equipped)
• PURGE with duct pressure control sequence “E”
This sequence can be used when supply air control
is required for smoke control.
– Supply Fan - On
– Supply Fan VFD - (If so equipped) Controlled by
Supply Air Pressure Control function; Supply Air
Pressure High Limit disabled
– Exhaust Fan - On; Exhaust Dampers Open (if so
equipped)
– OA Dampers - Open; Return Damper - Closed
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output - Energized
– VOM Relay - Energized
– Preheat Output - Off
– Return Fan - On; Exhaust Dampers - Open (if so
equipped)
– Return VFD - Max (if so equipped)
– OA Bypass Dampers - Open (if so equipped)
– Exhaust Bypass Dampers - Open (if so equipped)
Temperature vs. Resistance Coefficient
The UCM network relies on various sensors located
throughout the system to provide temperature information
in the form of an analog input. All of the sensors used have
the same temperature vs. resistance co-efficient and are
made from Keystone Carbon D97 material with a 1 degree
Centigrade tolerance.
Table 31. Temp vs. resistance
Temp (°F)
Resistance (in.
1000 Ohms) Temp (°F)
Resistance (in.
1000 Ohms)
-40 346.10 71 11.60
-30 241.70 72 11.31
-20 170.10 73 11.03
-10 121.40 74 10.76
-5 103.00 75 10.50
0 87.56 76 10.25
5 74.65 77 10.00
10 63.80 78 9.76
15 54.66 79 9.53
20 46.94 80 9.30
25 40.40 85 8.25
30 34.85 90 7.33
35 30.18 100 5.82
40 26.22 105 5.21
45 22.85 110 4.66
50 19.96 120 3.76
55 17.47 130 3.05
60 15.33 140 2.50
65 13.49 150 2.05
66 13.15 160 1.69
67 12.82 170 1.40
68 12.5 180 1.17
69 12.19 190 0.98
70 11.89 200 0.83
Emergency Stop Input
A normally closed (N.C.) switch wired to the customer
connection (1KF11) and 1XD24 may be used during
emergency situations to shut down all unit operations.
When opened, an immediate shutdown occurs. An
emergency stop diagnostic is entered into the user
interface. The unit must be manually reset. Refer to the
appropriate illustrations in and for the proper connection
terminals in the unit control panel. The switch must be
rated for 12 ma @ 24 VDC minimum.
Occupied/Unoccupied Contacts
To provide Night Setback control if a remote panel with
NSB was not ordered, a field supplied contact must be
installed. This binary input provides the Occupied/
Unoccupied status information of the building to the
Symbio 800. It can be initiated by a time clock, or a Building
Installation
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