Sequence Of Operations; Checkout & Troubleshooting; Led Description - TCS Basys Controls SZ2165 Product Manual

Sequence of Operation
HOT WATER
SUPPLY TEMP
140°F
OUTDOOR AIR
TEMPERATURE
60°F
HYSTERESIS
CHILLED WATER
SUPPLY TEMP
45°F
OUTDOOR AIR
TEMPERATURE
BOILER PUMP 1
HYSTERESIS
60°F
BOILER PUMP 2
HYSTERESIS
20°F
Checkout & Troubleshooting
CheCKoUt
1. Be sure to check and verify all wiring before powering the
SZ2165.
2. Turn power on. The SZ2165 "Power" LED should light up. Then
the Service LED will blink for 15 seconds while the electronics
stabilize.
3. If the SZ2165 has not been pre-programmed, It should be pro-
grammed at this time.
C3545_REV2
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
OFFSET
TYPICAL OF HEATING
DIFFERENTIAL
MIXING
VALVE
PROPORTIONAL
BAND (PID)
BOILER STAGE 4
BOILER STAGE 3
BOILER STAGE 2
BOILER STAGE 1
CHILLER ENABLE /
CHILLER STAGE 1
CHILLER STAGE 1
CHILLER STAGE 2
PROPORTIONAL
BAND (PID)
MIXING
VALVE
DIFFERENTIAL
TYPICAL OF COOLING
OFFSET
4. Increase and decrease the Heat and Cool setpoints. This must be
done from a PC. Observe the operation of the relay stages and or
analog ouput(s).
5. Note that the operation of the SZ2165 will depend on how it is
programmed.
The SZ2165 is now ready for operation.
tRoUBLeShooting
Power Led will not come on
Check for 24 VAC on terminals "24 VAC" and "GND". The rest of
the trouble shooting must be done with a PC and the Revelation
Professional software.
no communications
Make sure baud rate selection jumper for the QD1010 and the
SZ2165 are the same, and that Revelation is configured for that
same baud rate. Address 248 will always work provided that the
SZ2165 is NOT connected to a network.
inputs do not read correctly
The SZ2165 is calibrated at the factory. For the loop supply tem-
perature and other temperature readings make slight adjustments
(+/- 12% of the input span). on "Screen D" of the SZ2165 program-
ming screens. (See Temperature Input Calibration on page 6.)
output operation is not correct
Check programmed parameters, in particular "Reverse" and "Direct"
acting selections and "Heat" or "Cool" selections for the analog out-
puts, and "Offset"and "Differential" selections and "Delay Times" for
the relay outputs. Check wiring.
A pump won't turn on
If a pump will not turn on when it should, DI1, DI2 or DI5 may be set
for a pump proving function. If a pump fails, DI1, DI2 or DI5 must be
momentarily shorted in order to restart the respective pump.

LED Description

Sixteen LEDs on the unit allow the occupant to view the current
operating status of the SZ2165.
PoWeR: This LED will be lit whenever the unit has power.
digitAL oUtPUtS: These LEDs will be lit when the corre-
sponding relay outputs are on. Relaly outputs include pumps, boiler
stages, chiller stages, etc.
oCC: This LED will be on whenever the unit is operating in the
occupied mode.
SeRViCe: This LED will be on whenever the unit has a service
condition. This LED also blinks on powerup until the electronics sta-
bilize.
dAtA: This LED will blink when the unit is being accessed by a
PC.
R
8
Rev: 0911