ITT Bell & Gossett ZoneTrol II Z-2 Installation, Operation And Service Instructions

U L
C US
®
LISTED
Installation, Operation and Service Instructions
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER'S USE.
SAFETY
INSTRUCTION
This safety alert symbol will be used in this manual and on the
unit safety instructions decal to draw attention to safety related
instructions. When used, the safety alert symbol means ATTEN-
TION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
FAILURE TO FOLLOW THE INSTRUCTIONS MAY RESULT
IN A SAFETY HAZARD.

DESCRIPTION

The Bell & Gossett ZoneTrol II and McDonnell & Miller Zone-
Smart Pump Controllers are designed to control 120 VAC
circulating pumps in hydronic systems.
T-stat
Model Current
Z-2 / ZS-2
0.085
Z-3 / ZS-3
15 amps maximum combined load.

FEATURES

• Indicator lights visible without removing cover.
Power LED will illuminate when input power is applied to the
controller. Zone LEDs will illuminate when relay is energized.
Bell & Gossett
Models Z-2, Z-3
McDonnell & Miller ZoneSmart
Models ZS-2, ZS-3
Max.
Number of Max. HP
Zones per Pump
2
1/3
3
Instruction Manual 210712
® ZoneTrol II
• PRIORITY: This is typically used in domestic hot water
applications where it may be desirable to give hot water
production a priority over space heating requirements for a
certain period of time. Zone 1 is the priority zone and the
functionality is enabled via DIP switch 1. The priority timer is
selectable for 30 or 60 minutes, via DIP switch 3.
• PURGE: In normal operation, the last circulator will stop and
the boiler will shut down as soon as there is no longer a call
for heat. If the purge functionality is enabled via DIP switch
2, the boiler will shut down, but the circulator will continue
to run for 90 seconds to extract additional BTUs from the
boiler.
• EXERCISE: When the exercise functionality is enabled via
DIP switch 4, each circulator will run for 10 seconds after
every 72 hours of inactivity. This prevents scale and other
deposits from accumulating around the rotating parts and
ensures a trouble free start up at the beginning of each
heating season.

DIP SWITCH SETTINGS

Switch ON
1 Priority OFF
2 Purge On
3 Priority 30 minutes
4 Exercise On
5 Not Used
6 Power Delay On
MECHANICAL INSTALLATION
INSTRUCTIONS
The pump controller should be securely mounted on a wall
near the pumps using four #8 screws (not included).
REVISION B
™
™
OFF
Priority ON
Purge Off
Priority 60 minutes
Exercise Off
Not Used
Power Delay Off