Robertshaw SLIMZONE ENVIRONMENTAL MODULE User Manual

Installation

&

Operating Instructions

for

SLIMZONE

ENVIRONMENTAL MODULE

(SZEM)

TABLE OF CONTENTS

IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Data Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Bypass System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

High and Low Temperature Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Outdoor Temperature Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

SZEM Terminal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Bypass System Operation and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

SZEM Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Pressure Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Bypass Damper Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Bypass System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

High/Low Limits Operation and Installation Operation . . . . . . . . . . . . . . . . . . . . . . . . . .10

Temperature Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Outdoor Temperature Probe Operation and Installation Operation . . . . . . . . . . . . . . . . . .11

Outdoor Temperature Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

IMPORTANT

READ THIS BOOKLET THOROUGHLY IN ORDER TO
UNDERSTAND ALL THE OPERATION FEATURES OF YOUR
ENVIRONMENTAL MODULE.

RECORD THE SERIAL NUMBER IN THE SPACE PROVIDED.

SERIAL NUMBER

DATE OF INSTALLATION

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SLIMZONE ENVIRONMENTAL MODULE (SZEM)

INTRODUCTION

The Slimzone Environmental Module (SZEM) is an optional component in the Slimzone
Premier system. The module provides the following services:

* Bypass Damper control and static pressure sensing
* High/Low temperature limit signaling
* Outdoor temperature measurement

DATA EXCHANGE

All information collected by the SZEM module is
communicated to the Slimzone Premier control mod­ule (SZP) via a RS485 communication port at 1200
baud, 8 bits, no parity, with standard protocol. All
information received by the SZP control module may
be viewed by the user.

BYPASS SYSTEM

In order to maintain proper air flow and static pressure throughout the HVAC system, a
bypass system should be used. In some two zone applications a bypass damper may

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not be required. This is based on duct sizing where either zone is able to handle approximate­ly 75% of the total system CFM (cubic feet/minute). This will result in only slightly higher
air velocity at the discharge grille if only one zone is calling and yet allow for proper CFM
across the cooling coil.
Bypass activities are fully controlled by the SZEM module, which monitors the system static
pressure and modulates a motorized bypass damper accordingly. The static pressure value is
communicated to the SZP control module.

HIGH AND LOW TEMPERATURE LIMITS

When bypassing conditioned air it is important to consider high and low limit control to pre­vent coil freeze up or overheating. The SZEM module also monitors the conditioned air tem­perature and signals the SZP control module when the high and low limits are exceeded.
System air temperature value is communicated to the SZP control module.

OUTDOOR TEMPERATURE MEASUREMENTS

In heat pump applications, the outdoor temperature may be used to determine when to lock
out either the compressor(s) or auxiliary heat (high and low balance points). Outdoor air tem­perature is communicated to the SZP control module; outdoor temperature value may be dis­played at both the SZP module and zone thermostats.

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