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SECTION 8: CONTROL M ETHODS
27
CORAYVAC
®
Modulating system. The system will
modulate based on the temperature sensed at the
modulating thermostat, not outdoor temperature. The
modulating controls offer many features like 7 day
programmability, four time periods per day (2
occupied, 2 unoccupied), temporary temperature
setpoint override, keypad lockout security and more.
Remote sensors or outdoor sensors are optional, not
required. Remote sensors will allow for zone
temperature averaging, if required.
8.3.1 Analog Signal Modulating Thermostat
A programmable, 7-day programming, modulating
thermostat can be installed to supply an analog (4-
20mA) or (2-10Vdc with 500 Ohm resistor) control
signal to dictate the speed of the pump. Optional
room sensors (P/N 10081520) and outdoor air
sensors (P/N 10081521) are available.
Room temperature averaging networks can be
created with up to nine room sensors (P/N
10081520). Refer to thermostat installation
instructions for wiring.
8.3.2 Analog Signal Modulating Thermostat with
LonWorks
®
Communication
If LonWorks
®
communication is required, a
modulating thermostat can be installed to supply an
analog (4-20 mA or 2-10 Vdc) signal to control the
pump speed. An optional room sensor (P/N
10081520) and outdoor air sensors
(P/N 10081521) are available for this thermostat as
well.
The modulating thermostat with LonWorks
®
provides
networking capability in a LonWorks
®
system. With
communications port running at 78 kilobits per
second (kbs), this thermostat can be configured to
perform a variety of activities in which data is sent or
received via LonWorks
®
. Information that can be
shared, viewed and modified with the network
includes:
• Current year, month, day, hour, minute, second.
• System Mode.
• Space Temperature
• Outdoor air temperature
• Current setpoint
• Occupied/Unoccupied schedule commands.
• Space Temperature
8.3.3 Analog signal Modulating with BACnet
®
Programmable Thermostat
If BACnet
®
communication is required, a BACnet
®
enabled modulating thermostat can be installed to
supply an analog output (0-10VDC) signal control to
dictate the speed of the pump.
This thermostat is a flexible, wall-mounted stand-
alone control with combined controller/sensor.
BACnet
®
connections allow integral peer to peer
BACnet
®
MS/TP LAN network communications with
configurable baud rates and can easily integrate with
a building automation system.
MS/TP Wiring
Connect the -A terminal in parallel with all other -A
terminals on the network and the +B terminal in
parallel with other +B terminals. Connect the shield
of cable (Belden cable #82760 or equivalent).
Connect the cable shield to a good earth ground at
one end only.
8.4 SPST Transformer Relay Kit (P/N 90417600K)
The transformer relay can be used to control an EP-
100 or EP-201 pump CORAYVAC
®
system. The
single pole relay can only be used to control one
zone of burners. The electrical circuit is a 120 V AC
(20 A) supply. The transformer 24 V AC output for the
thermostat is rated at 40 V A. Thermostats used with
the transformer must not exceed this power
requirement.
A transformer relay operated system will not give any
post purge pump operation to completely exhaust
products of combustion from the system or provide
indication of operating conditions.
8.5 SPDT Transformer Relay (P/N 90436300)
The transformer relay can be used to control an EP-
100 or EP-201 pump CORAYVAC
®
system. The dou-
ble pole relay can only be used to control two zones
of burners. The electrical circuit is a 120 V AC (20 A)
supply. The transformer 24 V AC output for the ther-
mostat is rated at 40 VA. Thermostats used with the
transformer must not exceed this power requirement.
A transformer relay operated system will not give any
post purge pump operation to completely exhaust
products of combustion from the system or provide
indication of operating conditions.
8.6 Pressure Switch
A pressure switch is required to confirm pump opera-
tion on all systems.
A pressure switch is also required on the inlet duct of a
non-pressurized air supply.