Modine Manufacturing MCP15-542.0 Service Manual

MCP15-542.0

5H081676A

October, 2011

IMPORTANT

1. Disconnect power supply before installing the
accessory to prevent the unit from operating during
installation.

2. The use of this manual is specifically intended for a
qualified installation and service agency. All installation
and service of these kits must be performed by a
qualified installation and service agency.

3. These instructions must also be used in conjunction
with the Installation and Service Manual originally
shipped with the appliance, in addition to any other
accompanying component supplier literature.

Power Supply Input:

24 Vac (powered from unit)

Power Consumption:

1 Watt Maximum

Operating Conditions:

 32°F to 122°F
 10 to 85% Relative Humidity

(non-condensing)

Index of Protection:

IP30 (NEMA Type 1)

Carel pAD Digital Wall Stat/Humidity Sensor

INSTALLATION INSTRUCTIONS

Carel pAD digital wall stat/humidity sensor

commercial packaged ventilation system units

model MPR

Application

The Carel pAD (Ambient Display) wall thermostat/humidity
sensor is used in conjunction with the Carel pCO3 controller
mounted on model MPR Packaged Rooftop Commercial
Ventilation units.

Functions of the pAD include:

 Change temperature and humidity set points
 Clock display
 Alarm indication
 Time clock override
 Display of icons (refer to page 3)

Specifications

THIS MANUAL IS THE PROPERTY OF THE OWNER.

PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

INSTALLATION – Carel pAD Digital Wall Stat/Humidity Sensor

Terminal on pAD

Terminal on Main Unit or

pCO3 Controller

G (24 Vac)

503 (on unit)

G0 (ground)

500 (on unit)

Rx/Tx+ (positive pLAN)

Rx/Tx+ (on pCO3 – J11 block)

Rx/Tx- (negative pLAN)

Rx/Tx- (on pCO3 – J11 block)

1 – Cooling Mode
2 – Heating Mode
3 – Auto 
4 – Dehumidification Mode
5 – Humidification Mode 
6 – Fan Speed
7 – Units of Measure

8 – Temp/Humidity Setpoint
9 – Day of the Week
10 – Time/Temp/Humidity Setpoint
11 – ON/OFF Time 
12 – Occupied Override Time
13 – pAD Locked
14 – Active Alarm Indication

Installation

1. Separate the sensor from its base by pushing the white
tab at the bottom of the sensor and pull the white body
from the gray base by hinging it up from the bottom.
Refer to Figure 2.1.

Figure 2.1 – Separating the Sensor from the Base

2. Locate and mount the sensor in the conditioned space,
considering the following:

 Mount in a location representative of the space

temperature. Do not locate on an outside wall or
near supply grills, windows, or other devices that
could cause incorrect temperature readings.

 Mounting height will depend on personal

preferences and applicable codes.

 If required, the sensor can be mounted in a well-

ventilated thermostat cover.

 The sensor base will mount on a standard 2” x 4”

electrical box mounted sideways.

3. Connect the control wiring to the base terminals,
running the wiring through the hole in the center of the
base. The recommended control cable is 18-22 AWG
4-Core Twisted Pairs. Refer to Figure 2.2.

Figure 2.2 – Control Wiring to pAD Sensor Base

4. Connect the control wiring to the terminals on the model
MPR unit, or on the pCO3 controller mounted on the
model MPR unit, using Table 2.1 to cross-reference the
correct connections.

Table 2.1 – Terminal to Terminal Wiring Connection

5. Holding the sensor on the outer edge of the enclosure,
reinstall the sensor on the base by hooking the top of
the sensor into the base and hinge down, making sure
the pins line up. DO NOT force the sensor into place or
touch the components on the back of the sensor.

6. For the pAD Sensor to function correctly, the pAD
setting must be enabled in the pCO3 microprocessor
controller. This can be found under “Manufacturing
Settings” using the keypad (See pCO3 manual).

Display Features

Figure 2.3 shows the operation icons on the display of the
pAD and what they indicate. Note that not all are used with
model MPR applications.

Figure 2.3 – pAD Display Features

2 MCP15-542.0

 Not used with model MPR.