Unitary products group DSH, DSV, KSV, R-410A, KSH Installation Instructions Manual

MODELS DSH/KSH/DSV/KSV

R-410A LOW-AMBIENT KI T

Supersedes Form145.10-IOM1 (810) Form 145.10-IOM1 (910)

LOW-AMBIENT KIT

MODELS DSH/KSH/DSV/KSV

R-410A AIR CONDITIONING UNITS

INSTALLATION INSTRUCTIONS

IMPORTANT!

READ BEFORE PROCEEDING!

GENERAL SAFETY GUIDLINES

This equipment is a relativ ely complicated apparatus.
During installation, oper ation, maintenance or service,
individuals may be expose d to certain components or
conditions includi ng, but not l imi ted to: ref ri gerant s
materials under pressure, rotating components, and
both high and low voltage. Each of these items has the
potential, if misused or handled improperly, to cause
bodily injury or death. It is the obligation and respon­sibilty of operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure to
comply with any of these requirements could result in
serious damage to the equipment and the property in

SAFETY SYMBOLS

The following symbols are used in this document to alert the reader to areas of potential hazard.

DANGER indicates an imminently haz­ardous situation which, if not avoided,
will result in death or serious injury.

WARNING indicates a potentially haz­ardous situation which, if not avoided,
could result in death or serious injury.

All wiring must be in accordance with published specifi cations and must be per formed ONLY by
qualified service personnel. Johnson Controls will not be responsible for damages/problems
resulting from improper connections to the contr ols or appli ca tion of impr oper contr ol si gnals .
Failure to follow this will void the manufacturers’ warranty and cause serious damage to property
or injury to persons.

, oils,

which it is situated, as well as sever personal injury or
death to themselves and people at the site.

This document is intended for use by owner-authorized
operating/service personnel. It is expected that this
individual possesses independent training that will en­able them to perform their assigned tasks properly and
safely. It is essential that, prior to performing any task
on this equipment, this individual shall have read and
understood t his document a nd any refer enced materi a ls.
This individual shall also be familiar with and comply with
all applicable governmental standards and regulations
pertaining to the task in question.

CAUTION identifies a hazard which
could lead to damage to the machine,
damage to other equipment and/or
environmental pollution. Usually and
instruction will be given, together with a
brief explanation.

NOTE is used to highlight additional in­formation which may be helpful to you.

CHANGEABILITY OF THIS DOCUMENT

In complying with Johnson Controls policy for
continuous product improvement, the information
contained in this document is subject to change
without notice. While Johnson Controls makes no
commitment to up-date or provide current
information automatic ally to the manual owner, that
information, if applicable, can be obtained by
contacting the nearest Johnson Controls service
office.

It is the responsibi lity of operating/serv ice personnel
as to the applicability of these documents to the
equipment in question. If there is any ques tion in the
mind of operating/service personnel as to the
applicability of these documents, then, prior to
working on the equipment, they should verify with
the owner whether the e qui pment has been modif ied
and if current literature is available.

TABLE OF CONTENTS

4 ……General Information

4 ..…..Damper Installation
6 ……Pressure Control Panel Installation
6 ……Pressure Transducer Installation

Before installing this accessory kit, turn off electrical power to the equipment. Failure to do so
could result in electrical shock, resulting in component damage, injury or death.

8 ……Damper Actuator Installation & Wiring
10 ……Actuator Rotation Verific ation
11 ……Interconnection Drawings
13 ……Sequence of Operation
14 ……Schematics

GENERAL INFORMATION

If unit operation is required at outdoor ambient below
45 deg F, the optional Low Ambient Damper kit should
be installed to maintain acceptable condensing
pressure.

In horizontal units, the damper is installed directly over
the intake duct connection. The damper in vertical
units is installed over the exhaust duct connection (as
illustrated below). The damper position is determined
by refrigerant pressure. A direct-coupled electric
damper actuator motor drives the damper open or
closed, depending on the output signal from a
proportional pressure control module. A pressure
transducer senses the high-side refrigerant pressure,
through a service access port, located on the liquid
refrigerant line leaving the condenser. The pressure

controller, complete with terminal connection blocks for
wiring, is attached to a field-installed mounting bracket.
Appropriate mounting hardware for the pressure control
module and the damper actuator motor are provided
with the kit. A routing hole is provided in the condenser
corner panel, near the actuator mounting location, to
allow installation of the plenum-rated cable between the
motor and the control module.

A solid-state timer(s) is provided with the damper kit.
The timer will bypass the low pressure switch during
compressor start-up. The time delay allows the
condensing pressure to rise sufficiently for refrigerant
flow through the evaporator to be established, thereby
eliminating nuisance low-pressure lock-outs.

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On Dual compressor units, the transducer MUST be connected to the #1 circuit liquid line fitting.
Connection to the second stage refrigerant circuit will result in system malfunction.

When installing the transducer, observe all regulations governing the handling and containment of
hazardous or regulated materials (refrigerants or lubricants).

DAMPER INSTALLATION
HORIZONTAL UNITS (DSH / KSH SERIES)

1) Remove the factory installed duct attachment flanges from the condenser intake opening. Retain the two short
(vertical) flanges – these will be used in installation of the damper.

2) The kit contains two long flanges, which reduce the intake opening height to match the damper dimensions.
Attach these replacement flanges using the original holes and screws.

3) Re-attach one of the original vertical flanges as close to the edge of the corner post as possible (approx 1/8”
from edge of corner).

4) Position the damper casing between the two horizontal flanges surface, and butt the drive end of the damper
against the vertical flange at the corner of the unit. Ensure that the damper is orientated as shown – drive shaft
at the top of unit.

5) Secure the damper using the self-drilling screws provided (drive screws the holes in the flanges, into the metal
damper casing).

6) Attach the remaining vertical flange, opposite the drive end of the casing.

7) Ensure that the damper assembly rotates freely, with little or no resistance, by rotating the drive shaft by hand.

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VERTICAL UNITS (DSV / KSV SERIES)

1) The kit includes two vertical and two horizontal factory supplied duct flanges.

2) Locate pilot holes at condenser exhaust and line up duct flanges accordingly.

3) Secure flanges using self-drilling sheet metal screws. The horizontal flanges should be flush with the
condenser exhaust opening.

4) Position the damper inside the flanges and secure with screws.

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