Bell & Gossett 210668B Z-4M - Manual

NOTICE: This instruction manual is a supplement to, not a
contact the point of purchase or download the necessary
manuals at www.bellgossett.com.
DESCRIPTION
The outdoor reset modules are integrated into the
McDonnell & Miller ZoneSmart or Bell & Gossett ZoneTrol II
zone controllers. By monitoring outdoor temperature and
indexing the system supply water to the varying heatloss of
the building, the reset controllers minimize fuel consumption
while maximizing occupant comfort.
The
Boiler Reset Control is designed to control a single
stage, non modulating heat source in order to provide outdoor
reset.
The
Mix Reset Control is designed to control the supply water
temperature to a hydronic system in order to provide outdoor
reset or setpoint operation. The control uses a variable speed
injection pump to regulate the supply water temperature, while
protecting the boiler against flue gas condensation.
Bell & Gossett
®
ZoneTrol II
™
Models Z-4B, Z-4M, Z-6B, Z-6M,
ZV-4B, ZV-4M, ZV-6B, ZV-6M
McDonnell & Miller ZoneSmart
™
Models ZS-4B, ZS-4M, ZS-6B, ZS-6M,
ZSV-4B, ZSV-4M, ZSV-6B, ZSV-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.
Sensors Included
The Outdoor Temperature Sensor includes a
10 kΩ thermistor which provides an accurate
measurement of the outdoor temperature. The
sensor is protected by a white U.V. resistant
PVC plastic enclosure.
The Water Temperature Sensors have a zinc
sleeve for fast response and a wide operating
range. The sensors are supplied with 10 inches
(250mm) of two conductor wire.
SENSOR INSTALLATION INSTRUCTIONS
Outdoor Air Temperature Sensor
• Remove the screw and pull the front cover off the sensor
enclosure.
• The sensor can either be mounted directly onto a wall or a
2" x 4" electrical box.
• When the sensor is wall mounted, the wiring should enter
through the back or bottom of the enclosure. Do not mount
the sensor with the conduit knockout facing upwards as
water could enter the enclosure and damage the sensor.
• In order to prevent heat transmitted through the wall from
affecting the sensor reading, it may be necessary to install
an insulating barrier behind the enclosure.
• The sensor should be mounted on a wall which best repre-
sents the heat load on the building (a northern wall for most
buildings and a southern facing wall for buildings with large
south facing glass areas). The sensor should not be
exposed to heat sources such as ventilation or window
openings.
UL
®
C US
LISTED
replacement for Instruction Manual 210667. If you do
not have all manuals necessary for installation, please
INSTRUCTION MANUAL
210668B