Bell & Gossett P80925B Zone Trol Zone Pump Controller ZT-6 - Manual (Page 6)

OPERATION
The circulators wired to the ZoneTrol pump controller are con-
trolled by a low voltage thermostat or any other low voltage
controller having a SPST switch. The relays provide intermedi-
ate switching to permit line voltage to the circulators. The
ZoneTrol will operate with most digital/programmable ther-
mostats. The isolated end switch relay (terminals XX) has a full
10 amp rating. The resetable fuse protects the ZoneTrol from
overloading conditions.
The following sequence occurs when the ZT-4 has a call for
heat:
1. Isolated switch relay closes.
2. XX switch is closed.
3. XX indicator light turns on.
4. Control relay closes. (ZC and ZR connection required either
by factory installed jumper or through aquastat)
OPERATION
5. ZC indicator light turns on.
6. Zone circulator starts.
7. Respective zone light indicator turns on.
If priority switch is in ON position:
1. Zone 1 becomes priority zone.
2. When priority zone 1 circulator is actuated, the other circu-
lators will not operate.
3. The ZoneTrol has a 30 minute timer on the priority zone.
After 30 minutes of continuous operation, the priority zone
will default to allow all other zone to operate in order to pre-
vent house freeze up. The timer is reset after the priority
zone is satisfied.
100% factory tested –
limited 5 year warranty.
Separate XX isolated end switch and ZC/ZR
relays protect boiler aquastat. Can be used with
“tankless coil” or “cold start” applications.
Replaceable, standard “ice cube” type relays allow
up to 10 amps, 1 /
3
HP per individual zone.
Powerful 30 VA transformer operates
up to 6 zones.
Switchable priority adds versatility and ease
of installation.
30 minute built-in safety priority timer helps prevent
house freeze up – no additional plug-in cards required.
Automatically resetable fuse protects controller
from overload – Eliminate “no heat” call backs due
to blown fuse.
LED dianostic lights for easy trouble shooting are
installed internally for heating professional’s use –
no more calls from curious homeowners inquiring
about flashing lights.
24 volt I/O terminal for connection of 3 wire thermostats
or field replacement of transformer.
Clearly marked terminals and plenty of clearance make
for easy, fast hook-up.
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8200 N. Austin Avenue
Morton Grove, IL 60053
Phone: (847) 966-3700
Fax: (847) 966-9052
http://www.bellgossett.com
© COPYRIGHT 2006 BY
PRINTED IN U.S.A. 12-06