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.
• 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.
DESCRIPTION
The Bell & Gossett ZoneTrol II and McDonnell & Miller Zone-
Smart Pump Controllers are designed to control 120 VAC
circulating pumps in hydronic systems.
Max.
T-stat
Number of
Max.
Model
Current
Zones
HP/Pump
Z-4 / ZS-4
0.085
4
1/3
Z-6 / ZS-6
6
Bell & Gossett
®
ZoneTrol II
™
Models Z-4, Z-4B, Z-4M, Z-6, Z-6B, Z-6M
McDonnell & Miller ZoneSmart
™
Models ZS-4, ZS-4B, ZS-4M, ZS-6, ZS-6B, ZS-6M
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.
INSTALLER:
PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
DIP SWITCH SETTINGS
Switch
ON
OFF
1
Slave
Master
Priority Off
Priority On
2
Purge On
Purge Off
3
Priority 30 minutes
Priority 60 minutes
4
Exercise On
Exercise Off
5
Reset
Normal
6
Power Delay On
Power Delay Off
OUTDOOR RESET
For controllers with intergal outdoor reset controller,
please refer to Instruction Manual 210668. This document
can be downloaded at www.bellgossett.com or
www.mcdonnellmiller.com.
MECHANICAL INSTALLATION INSTRUCTIONS
The pump controller should be securely mounted on a wall
near the pumps using four #8 screws (not included).
ELECTRICAL INSTALLATION INSTRUCTIONS
1. Disconnect the electrical supply to the pump before
installing the controller.
2. Refer to the applicable wiring diagram
- Figure 1A: Cold Start Boiler
- Figure 1B: Tankless Coil
3. Verify that the circulator(s) do not exceed the electrical rat-
ing of the controller.
WARNING: Electrical Shock Hazard
Electrical connections are to be made by a qualified
electrician in accordance with all applicable codes, ordi-
nances and good practices Disconnect and lock out the
power before making electrical connections. Failure to fol-
low these instructions could result in serious personal injury
and/or death.
UL
®
C
US
LISTED
20 amps maximum combined load.
INSTRUCTION MANUAL
210667C
