International Comfort Products CPLOWAMB001A00 Installation Manual
CPLOWAMB001A00
ELECTRIC COOLING AND HEAT PUMP UNITS
Installation Instructions
IMPORTANT: Read these instructions completely before
attempting to install this accessory.
PACKAGE CONTENTS
ITEM QTY CONTENTS
AL56AU216 4 Screws 10B--- 16 x ½ LG
50DK402769 1 Conductive Grease
AU27AS131 2 Lockwashers, #10
50HS500288 1 Bracket
I I K --- C P LO WA M B --- 0 6 1 Instructions
SMALL ROOFTOP UNITS
GAS HEAT/ELECTRIC COOLING,
ACCESSORY MOTORMASTERR II
HEAD PRESSURE CONTROLLER 60Hz
3to12---1/2tons
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance
operations on unit, turn off main power switch to
unit and install lockout tag. Ensure electrical service
to rooftop unit agrees with voltage and amperage
listed on the unit rating plate.
SAFETY CONSIDERATIONS
Installation, start--up and servicing of this equipment can
be hazardous due to system pressures, electrical
components and equipment location (roofs, elevated
structures, etc.)
Untrained personnel can perform the basic maintenance
functions. All other operations should be performed by
trained service personnel. When working on
air--conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other
safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves.
Recognize safety information. This is the safety--alert
symbol
instructions or manuals, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert
symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies a hazard which could result in
personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
. When you see this symbol on the unit and in
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Open all remote disconnects and install lockout tag(s)
before servicing this equipment.
INTRODUCTION
The Motormaster II head pressure controller is a cycle
control device activated by a temperature sensor mounted
on a header tube of the outdoor coil. (See Fig. 1.) It is
designed to cycle the outdoor-fan motors on or off to
maintain the saturated condensing temperature within
normal operating limits of approximately 130_ to 110_F
high, 70_ to 50_F low. The controller maintains working
head pressure at low ambient temperatures down to 0_F.
The controller is activated by a temperature sensor and is
for use with 60 Hz units only. The controller can be used
with both single-phase and 3-phase units.
NOTE: This accessory requires Winter Start package.
Copyright 2011 CAC / BDP D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 12/11
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:IIK --- CPLOWAMB --- 06
R e p la ce s : I I K --- C P LO W A MB --- 0 4
C08282
Fig. 1 -- Motormaster II Controller
1. Disconnect power to unit, install lockout tag.
2. Disconnect outdoor-fan motor (OFM) wires at the
contactor.
3. Remove OFM wires from unit control box.
4. Mount Motormaster II controller on unit. Refer to
Fig. 2.
NOTE: The controller must be mounted vertically with
the leads at the bottom.
Using the template supplied on the last page in this book,
drill mounting holes. To ensure electrical ground, insert
star washers (supplied with the controller) under the heads
of mounting screws.
5. Determine sensor location by referring to Fig. 3-12.
Route sensor wire through bottom of Motormaster II
controller (Fig. 13) to sensor location specified. Prior to installation, apply conductive grease supplied
with accessory to contact surface of sensor.
!
CAUTION
6. Attach sensor to top half of header tube as shown in
Fig. 14. Installed sensor must be left uninsulated.
7. Power wiring must comply with all local and National Electrical Code (NEC) requirements. Refer to
Fig. 15-18 for power wiring connections. Coil up all
excess wire and secure it next to the controller.
8. The transformer is factory wired for 460-v operation. It must be rewired for 208/230-v use. Remove
the black wire from L2 to 460-v black and connect
red wire (208 v) or orange wire (230 v) to L2 for
desired operation. Install wire nuts over wires not in
use.
NOTE: Refer to Fig. 19 for thermistor resistance vs
temperature.
9. Wind baffles are required to prevent wind crosscurrents from causing abnormally low condensing temperatures. Wind baffle fabrication details are described in Fig. 20 and 21.
10. Reconnect power to the unit.
The Motormaster II head pressure controller is equipped
with an alternate operating mode. When this mode is
selected, the controller shifts the fan cycle sequence to
effectively raise the average condensing temperature
approximately 20_F higher than the standard operating
mode. In this alternate mode, the outdoor fan begins
cycling at higher outdoor ambient temperatures. This
mode should only be used if the evaporator coil shows
signs of frosting at low outdoor ambient temperatures.
To select the alternate operating mode, move the jumper
wire on the Motormaster II control board from terminal
T1 to terminal T2.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to
equipment.
Sensor assembly is delicate. Handle with care.
2
MOTORMASTER II
50TC04--07; RAS036--072; 558J04--07
UNITS WITHOUT SINGLE POINT BOX
MOTORMASTER II
MOTORMASTER II
C10715
CONDENSER
OIL
BULKHEAD
COMPRESSORS
50TC08--12; RAS090--121; 558J08--12
UNITS WITH SINGLE POINT BOX
MOTORMASTER III
CONTROLLER
SINGLE POINT
BOX
C10716
MOTORMASTER II
48TC04--07; RGS036--072; 580J04--07
UNITS WITHOUT SINGLE POINT BOX
CONDENSER
OIL
BULKHEAD
COMPRESSORS
50TC08--12; RAS090--121; 558J08--12
UNITS WITHOUT SINGLE POINT BOX
C10718
50TC04--07; RAS036--072; 558J04--07
UNITS WITH SINGLE POINT BOX
MOTORMASTER II
CONTROLLER
C10719
48TC08--12; RGS090--121; 580J08--12
UNITS WITH SINGLE POINT BOX
Fig. 2 -- Motormaster II Controller Location
C10717
MOTORMASTER II
C10720
3
48/50TC04;
C08615
RGS/RAS036;
580J/558J04
Fig. 3 -- MotormasterR II Sensor Locations -- 3 Ton Cooling Units
48/50TC05 and 06;
C08260
RGS/RAS048 and 060;
580J/558J05 and 06
Fig. 4 -- MotormasterR II Sensor Locations -- 4 and 5 Ton Cooling Units
4
48/50TC07;
C08261
RGS/RAS072;
580J/558J07
Fig. 5 -- MotormasterR II Sensor Locations -- 6 Ton Cooling Units
48/50TC08;
C08616
RGS/RAS090, 091;
580J/558J08
Fig. 6 -- MotormasterR II Sensor Locations -- 7--1/2 Ton Cooling Units
5
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