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Unit Startup
Tracer ZN010 and ZN510
Controllers
Tracer ZN010 controller is a stand-alone microprocessor
controller that controls fan coils and cabinet heaters.
Tracer ZN510 controller is a discrete speed controller that
can be used in a stand-alone application or can
communicate with a building automation system using
®
LonTalk
communications.
ZN510 Stand-Alone Operation
The factory pre-programs the Tracer ZN510 with default
values to control the temperature and unit airflow. Use
Tracer Summit building automation system or Rover™
software to change the default values. For more
information, refer to:
•
CNT-IOP-1 ComfortLink 10 Controller: Installation,
Operation and Programming Guide for Tracer ZN510
Follow the procedure below to operate the Tracer ZN510 in
a stand-alone operation:
1. Turn power on at the disconnect switch option.
2. Position the fan mode switch to either high, medium,
low, or the auto position.
3. Rotate the setpoint dial on the zone sensor module to
55°F for cooling or 85°F for heating.
The appropriate control valve will actuate assuming the
following conditions:
•
Room temperature should be greater than 55°F and
less than 85°F .
•
For a 2-pipe fan-coil unit with an automatic changeover
sensor, the water temperature input is appropriate for
the demand placed on the unit. For example, cooling
operation is requested and cold water (5° lower than
room temperature) flows into the unit.
•
Select the correct temperature setpoint.
Note: Select and enable zone sensor temperature
settings to prevent freeze damage to unit.
ZN010 and ZN510 Operation
Fan Mode Switch
Off - Fan is turned off, two-position damper option spring-
returns closed.
Hi, Med, Lo - Fan runs continuously at the selected speed.
The two-position damper option opens to an adjustable
mechanical stop position.
Controller
Off - Fan is off; control valves and fresh air damper option
close. Low air temperature detection option is still active.
UNT-SVX07E-EN
Auto (Fan Cycling) - Fan and fresh air damper cycle with
control valve option to maintain setpoint temperature. In
cooling mode, the fan cycles from off to medium and in
heating mode it cycles from off to low. When no heating or
cooling is required, the fan is off and the fresh air damper
option closes.
Low/Med/High (Continuous Fan) - Fan operates
continuously while control valve option cycles to maintain
setpoint temperature. Fresh air damper option is open.
Sequence of Operation
Power-Up Sequence
When 24 Vac power is initially applied to the controller, the
following sequence occurs:
1. All outputs are controlled off.
2. Controller reads all input values to determine initial
values.
3. The random start time (0-25 seconds) expires.
4. Normal operation begins.
Water Temperature Sampling Function
The controller uses an entering water temperature
sampling function to test for the correct water temperature
for the unit operating mode. For all applications not
involving changeover, the water temperature does not
affect unit operation.
The entering water temperature sampling function opens
the main hydronic valve, waits no more than three minutes
to allow the water temperature to stabilize, then measures
the entering water temperature to see if the correct water
temperature is available.
The entering water must be five degrees or more above
the space temperature to allow hydronic heating and five
degrees or more below the space temperature to allow
hydronic cooling.
If the correct water temperature is available, the unit
begins normal heating or cooling operation. If the
measured entering water temperature is too low or high,
the controller closes the valve and waits 60 minutes before
attempting to sample the entering water. Refer to
Table 43. Unit mode as related to water temperature
EWT
Sensor
Unit Type
Required? Coil Water Temperature
2-pipe changeover
Yes
4-pipe changeover
Yes
2-pipe heating only
No
2-pipe cooling only
No
4 pipe (2 pipe heat
No
and 2 pipe cool)
Startup
Table
COOLS if: Space temp - EWT ≥ 5°F
HEATS if: EWT - space temp ≥ 5°F
COOLS if: Space temp - EWT ≥ 5°F
HEATS if: EWT - space temp≥ 5°F
Hot water assumed
Cold water assumed
Cold water assumed in main coil
Hot water assumed in aux. coil
43.
103
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Troubleshooting
