Installation

© 2001 D 364 - 07/01 16 of 36
BOILER OPERATION
When the 364 determines boiler operation is required, the Boiler contact terminals (15 and 16) close. While the Boiler contact is
closed, the burner segment in the LCD is displayed.
BOILER PURGE (PURGE P1)
After all of the demands are satisfied, the 364 continues to operate the primary pump (P1, terminal 8) for a period of time. The
length of time that the primary pump continues to run is adjustable (PURGE P1). This setting allows any excess heat to be purged
out of the boiler after the burner is shut off. This also helps to prevent the water in the boiler from flashing into steam after the
boiler is shut off. The primary pump (P1) continues to run either until the purging time has elapsed or the Boil SUP temperature has
dropped more than a differential below the Boil MIN setting. However, there must not be any motorized valves that will restrict water
flow through the pump and boiler.
BOILER SENSOR ON THE RETURN (RET)
The boiler sensor should be located on the boiler return if the 364 is one of many con-
trols that can call for boiler operation. When in the return mode, the 364 provides a boiler
enable. The 364 no longer tries to control the boiler supply water temperature directly,
but allows the boiler to operate at the operating aquastat setting. If this mode of opera-
tion is selected, the primary pump should not be operated by the operating aquastat
as this may lead to improper cycling of the boiler because of inconsistent flow past the
boiler sensor.
When the mixing device begins to ramp up or either a boiler demand, DHW demand or setpoint demand is present, the Boiler
contact on the 364 closes. The Boiler contact remains closed until all the demands no longer require heat. With the sensor on the
boiler return, the 364 is still capable of providing boiler protection as described in section D1.
NO BOILER SENSOR (NONE)
The 364 is capable of operating without a boiler sensor if desired. Without a boiler
sensor, the 364 is unable to provide boiler protection. The Boiler contact still functions
without the boiler sensor. When the mixing device begins to ramp up or a boiler demand,
DHW demand or setpoint demand is present, the Boiler contact on the 364 closes. The
Boiler contact remains closed until all of the demands no longer require heat. This type
of application is typical if the 364 is drawing heat from a heat source that already incor-
porates some form of boiler protection.
Section F2: Boiler Return Sensor
Section F3: No Boiler Sensor
Installation
CAUTION
Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury. It
is your responsibility to ensure that this control is safely installed to all applicable codes and standards. This electronic control is
not intended for use as a primary limit control. Other controls that are intended and certified as safety limits must be placed into
the control circuit.
STEP ONE
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GETTING READY
Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or tekmar
sales representative for assistance.
Type 364 includes: One Universal Reset Control 364, One Outdoor Sensor 070, Two Universal Sensors 071,
Data Brochures D 364, D 070, D 001, User Brochure U 364, Application Brochure A 364, Essays E 003, E 021.
Note: Carefully read the details of the Sequence of Operation to ensure that you have chosen the proper control for your application.
STEP TWO
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MOUNTING THE BASE
Remove the control from its base by pressing down on the release clip in the wiring chamber and sliding the control away from it.
The base is then mounted in accordance with the instructions in the Data Brochure D 001.