Emerson 1HDEZ-1521 User Manual

TROUBLESHOOTING

™

Emerson Inspire

1HDEZ-1521

Installation Instructions

Thermostat/Interface

Equipment Control

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE

WARNING

!

CAUTION

!

INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.

To prevent electrical shock and/or equipment damage, disconnect
electric power to system at main fuse or circuit breaker box until
installation is complete.

Thermostat installation and all components of the control system shall
conform to Class II circuits per the NEC code.

ATTENTION: MERCURY NOTICE

This product does not contain mercury. However, this product may replace
a product that contains mercury.

Mercury and products containing mercury must not be discarded in
household trash. Do not touch any spilled mercury. Wearing non-absorbent
gloves, clean up any spilled mercury and place in a sealed container. For
proper disposal of a product containing mercury or a sealed container of
spilled mercury, place it in a suitable shipping container. Refer to www.

thermostat-recycle.org for location to send product containing mercury.

Index Page

Applications and Specications

Installation
Advanced Installer Menu
Main Menu
Troubleshooting

3

4
12
20
26

2

Applications and Speci cations

Con guration

Options

Single Stage Gas, Oil, Electric, Heat Only, Cool Only or

Heat Cool Systems

Multi Stage Gas, Oil, Electric, Heat Only, Cool Only or

Heat Cool Systems

Heat Pump Single or Two Compressor Systems with up

to 2 Stages of Aux / Em Heat

Heat Pump

with Dual Fuel

Single or Two Compressor Systems with up
to 2 Stages of Fossil fuel Heat

Applications Maximum

Stages

1/1

2/2

4/2

4/2

Electrical Rating:

Input-Hardwire .............................. 20 to 30 VAC

Terminal Load ............................... 1.0A per terminal, 2.5A maximum

all terminals combined

Setpoint Range ............................. 45° to 99°F (7° to 37°C)

Di erential (Single Stage) ............. Heat 0.6°F; Cool 1.2°F

Di erential (Multi-Stage) .............. Heat 0.6°F; Cool 1.2°F

Di erential (Heat Pump) ............... Heat 1.2°F; Cool 1.2°F

Operating Ambient ....................... 32°F to +105°F (0° to +41°C)

Operating Humidity ...................... 90% non-condensing max.

Shipping Temperature Range ........ -40° to +150°F (-40° to +65°C)

Dimensions Interface .................... 3-1/4"H x 6-1/8"W x 5/8"D

Dimensions Control ....................... 5-1/2"H x 5-3/4"W x 1-1/2"D

APPLICATIONS

& SPECIFICATIONS

3

Installation

Reduce installation time with a USB

1. Go to www.white-rodgers.com

2. Enter 1HDEZ-1521 in the Model

Number Search  eld

3. Select the link for the USB download

INSTALLATION

tool and follow instructions

Upload pre-con gured thermostat

settings for every job!

Create custom messages for your rou­tine maintenance and service calls!

4

INSTALLATION

Retur

Installation

Equipment Control

Mount on wall or exterior surface of HVAC equipment. Control has four
mounting holes. Wall anchors and screws are provided for mounting on dry­wall. Drill 3/16" hole for drywall mounting.

If mounting on equipment Do Not Mount inside HVAC equipment.
Only mount on outside of HVAC equipment.

n Air Duct

Supply

Duct

Equipment Control

Module

Gas Furnace Equipment

5

INSTALLATION

Installation

Equipment Control Terminals Operation / Function

R ................................................ 24 VAC Transformer

RC .............................................. 24 VAC Cooling Transformer*

RH ............................................. 24 VAC Heating Transformer*

C ................................................ 24 V Transformer Common

W/E ............................................ Heating Stage 1 HP Aux/Em Heat Stage 1

W2 ............................................. Heating Stage 2 HP Aux/Em Heat Stage 2

Y ................................................ Compressor Stage 1

Y2 .............................................. Compressor Stage 2

G ................................................ Fan Relay

L Terminal .................................. System Monitor Compatible with

Comfort Alert Diagnostics

O/B Terminal .............................. Changeover Relay Heat Pump

DHM .......................................... Dehumidication Relay / Connection

DHM2 ........................................ Dehumidication Relay / Connection

HM ............................................. Humidication Relay / Connection

HM2 ........................................... Humidication Relay / Connection

R ................................................ 24 VAC to Interface

1 ................................................. Data to/from Interface

2 ................................................. Data to/from Interface

C ................................................ 24 VAC Common to Interface

RJ11 ........................................... Field conguration hook-up with RJ11

equipped conguration tool

+ ................................................. Voltage to Outdoor Sensor

S ................................................ Outdoor Sensor Temperature Signal

- ................................................. Voltage to Outdoor Sensor

*For 2 transformer systems, cut and tape o one transformer. If transformer

safety circuits are only in one of the systems, remove the transformer of the
system with NO safety circuits. If required, replace remaining transformer
with a 75 VA Class II transformer. After disconnecting one transformer, the
two commons must be jumpered together.

6

INSTALLATION

LED push

Installation

button switch

Wiring to
indoor/outdoor
equipment

Wiring to

Sensor

R and C from HVAC

terminal strip or

system transformer

+
S

-

R
RC
RH

C

W/E

O/B

HM

HM2

W2

Y

Y2

G

L

Wiring to
humidification
equipment

Status/Fault

7-Segment LED

Wiring to

Thermostat

Configuration Plug-In tool

R

1
2

C

RJ-11 Connection for

DHM switch*

HM switch*

DHM

DHM2

Wiring to
dehumidification
equipment

* To use the HVAC transformer to power humidication/dehumidication

switch HM/DHM switches to “SYS” position:

– Connect humidier to HM
– Connect dehumidier to DHM
If humidier or dehumidier have a separate transformer, switch HM or

DHM switch to “DRY” position:

– Connect humidier to HM and HM2 (or)
– Connect dehumidier to DHM and DHM2

7

INSTALLATION

Installation

Fig. 1 - Typical Connection of a Single Stage or Multi-Stage System

*

SYSTEM R RH RC C W/E

Heat N/A Cool N/A Fan N/A System

24 VAC

Common

Heat

Required

mode

Single

Stage

Multi

Stage

24 VAC

Power

24 VAC

Power

24 VAC

Power for

Heating

24 VAC

Power

24 VAC

Power

for Cooling

24 VAC

Power

stage

*Factory installed jumper between RH and RC

Fig. 2 - Typical Connection of Heat Pump System up to 4 Stages
Heat/2 Stages Cool

*

SYSTEM R RH RC C W/E

Heat

24 VAC

24 VAC

Pump

Power

Power for

Heating

24 VAC

Power

for Cooling

*Factory installed jumper between RH and RC
Note: Dual fuel systems W/E is fossil fuel 1

24 VAC

Common

Required

Aux /

Em

1

Stage

Y

1

Y

1

sor

st

st

mode

stage

Stage

-

G O/B L

Y2

Cool

nd

2

G O/B L

Y2

nd

Fan Change

2

Com

-

pres-

sor

over

Valve

W2

Heat

Cool

mode

mode

st

nd

1

2

stage

stage

W2

Aux /

Em

Stage

st

nd

2

Com

Stage

pres-

st

stage and W2 is fossil fuel 2nd stage.

Monitor

-

NEUTRAL

24 VAC

HOT

System

Monitor

NEUTRAL

24 VAC

CLASS II

Transformer

HOT

Transformer

120 VAC

120 VAC

CLASS II

8

INSTALLATION

Installation

Wiring Guide for Equipment Accessories

Fig. 3 - Humidier. HM terminal provides system 24V on call for humidication

RH

HM DRY

HM2

HM

HM2

Non-Powered
Humidier

R

C

Transformer

Fig. 4 - Powered Humidier. With HM DRY switch in HM2 position, HM
and HM2 provide normally open dry contact for low voltage (24V) powered

humidier connection.

RH

HM DRY

HM2

HM

HM2

Non-Powered
Humidier

Fig. 5 - Powered Dehumidier. With DHM DRY switch in DHM2 position,
DHM and DHM2 provide normally open dry contact for low voltage (24V)

whole house powered dehumidier connection.

RH

DHM DRY

DHM2

DHM

DHM2

Powered
Dehumidier

9

INSTALLATION

Installation

Wiring Guide for Equipment Accessories

Fig. 6 - System Dehumidication with variable speed blower. For systems
where low speed requires connect to normally open 24V powered DHM
terminal for low speed connection on air handler/furnace (24V removed

on dehumidication call).

RH

DHM DRY

DHM2

Fig. 7 - System Dehumidication with variable speed blower. For systems
where low speed requires system 24V on dehumidification connect 24V
to DHM2 with DHM DRY switch in DHM2 position and connect DHM
to low speed connection on air handler/ furnace.

DHM

DHM2

Low Speed
Fan

Transformer

10

R

RH

C

DHM DRY

DHM2

DHM

DHM2

Low Speed
Fan