Roberts Gorden CRV-B-4 - Manual (Page 33)

SECTION 8: C ONTROL M ETHODS
27
Buildings today demand all sorts of control options
based on the user’s preference. ULTRAVAC™
controls offer a host of communication options for
integration with controls’ networks to best serve
individual needs:
BACnet
® : Interface ULTRAVAC™ with other building
management control platforms with our BACnet
option.
TCP/IP (LAN): Connect to ULTRAVAC™ via your
local area network of computers. Load ULTRAVAC™
software onto any computer on the network and
control and view your heating system from your
computer.
MODEM: Dial into ULTRAVAC™ from anywhere in
the world via modem. Supplied as standard on all
central controllers!
RS-485: Hard wire ULTRAVAC™ directly to your
computer.
There are references in this manual to various trademarks. All
trademarks mentioned herein, whether registered or not, are the
property of their respective owners. Roberts-Gordon is not
sponsored by or affiliated with any of the trademark or registered
trademark owners, and make no representations about them,
their owners, their products or services.
Roberts-Gordon LLC is not sponsored by or affiliated with
BACnet®.
8.3 SPST Transformer Relay (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 ther-
mostat 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. The transformer
relay wiring diagram is shown in the CORAYVAC
®
Installation, Operation and Service Manual (P/N
127102NA).
8.4 DPST Transformer Relay (P/N 90436300)
The transformer relay can be used to control an EP-
100 or EP-201 pump CORAYVAC
® system. The double
pole relay can only be used to control two zones of
burners. The electrical circuit is a 120 V AC (20A) sup-
ply. The transformer 24 V AC output for the thermostat
is rated at 40 VA. Thermostats used with the trans-
former 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. The transformer
relay wiring diagram is shown in the CORAYVAC
®
Installation, Operation and Service Manual (P/N
127102NA).
8.5 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.