Penn System 450 series User manual

System 450 Series C450CCU Condensing Unit

Control Module Installation Guide

Description

The System 450™ Series condensing unit control module

controls space temperature, scheduled defrost cycles,

evaporator fans, and optional pump down compressor

control on medium and low temperature refrigeration

condensing units.

You can use the C450CCU-4 control module, in conjunction

with optional System 450 relay output expansion modules,

to build a variety of custom condensing unit control

systems for small and medium capacity refrigeration

applications.

The C450CCU-4 condensing unit control system provides

passive, off-cycle defrost control or active, electric heat

defrost control. Depending on the application, you can

terminate defrost cycles based on time or based on

sensed evaporator temperature. You can use a menu

option to manually initiate or terminate a defrost cycle at

any time.

You can also control single-speed or two-speed evaporator

fans, and add an optional pressure transducer for pump

down pressure control of the compressor.

Refer to the System 450 Series C450CCU Condensing

Unit Control System Technical Bulletin (LIT-12013266) for

detailed information about how to set up, operate, and

troubleshoot a System 450 condensing unit control

system.

Application

Important: Use the System 450 Series C450CCU

condensing unit control module only as an

operating control. Where failure or malfunction

of the condensing unit control module could lead

to personal injury or property damage to the

controlled equipment or other property, additional

precautions must be designed into the control

system. Incorporate and maintain other devices,

such as supervisory or alarm systems or safety or

limit controls, intended to warn of or protect against

failure or malfunction of the condensing unit control

module.

Important: Utiliser ce System 450 Series C450CCU

condensing unit control module uniquement en

tant que dispositif de contrôle de fonctionnement.

Lorsqu'une défaillance ou un dysfonctionnement

du régulateur risque de provoquer des blessures

ou d'endommager l'équipement contrôlé ou un

autre équipement, la conception du système de

contrôle doit intégrer des dispositifs de protection

supplémentaires. Veiller dans ce cas à intégrer de

façon permanente d'autres dispositifs, tels que

des systèmes de supervision ou d'alarme, ou des

dispositifs de sécurité ou de limitation, ayant une

fonction d'avertissement ou de protection en cas de

défaillance ou de dysfonctionnement du régulateur.

Installation

Figure 1: System 450 module dimensions, mm (in.)

Table 1: System 450 module dimensions, mm (in.)

Callout Description

1 35 mm DIN rail mount channel

2 12.7 mm (1/2 in.) conduit hole, nominal trade size

Mounting modules and module

assemblies

Observe the following location and mounting guidelines.

• Make sure that the mounting surface can support the

module assembly, DIN rail, mounting hardware, and

any user-supplied panel or enclosure.

• Mount the modules upright and plugged together in a

horizontal row where possible, as shown in Figure 2. It

is best practice to mount the control module on a DIN

rail.

• In direct-mount applications, mount the modules on flat

and even surfaces.

• Allow sufficient space to make connections, run wires,

and view the LCD and LEDs.

• Mount the modules in locations free of corrosive

vapors, and observe the ambient operating conditions

listed in the C450CCU condensing unit control module

technical specifications.

• Do not mount the modules on surfaces that are prone

to vibration or in locations where high-voltage relays

and motor-starters, electromagnetic emissions, or

strong radio frequency may cause interference.

24-7664-03809 Part No. Rev. C

2020-10-21

C450CCU

• Do not install the modules in airtight enclosures.

• Do not install heat generating devices in an enclosure

with the modules that may cause the ambient

temperature to exceed 66°C (150°F).

Mounting modules on DIN rail

Before you begin:

Important: When you mount a module assembly

on a DIN rail, clip the modules on to the DIN rail

individually before you slide and plug the mounted

modules together. If you clip a complete module

assembly that is already plugged together on to the

DIN rail, it can damage the 6 pin modular plugs and

void any warranties.

1. Mount the control module in a suitable location on

a section of 35 mm DIN rail that is longer than the

module assembly width. Use appropriate mounting

hardware.

2. Clip the control module on to the rail, position the

module’s upper DIN rail clips on the top rail, and

gently snap the lower clips on to the bottom of the

rail.

3. Assemble the modules in the correct order. Clip

the remaining modules to the right of the control

module on to the DIN rail and gently slide and plug

the modules together.

Note:

- If you use a C450YNN power module,

you must plug it into the control module.

Plug in any expansion modules for your

control system to the right of the power

module.

- When you power on your module

assembly, you can then set up your

control system in the control module UI

before you wire the sensors or outputs to

your assembly. If you set up the sensors

in the UI but do not connect them, an

SNF sensor failure notification displays.

Direct-mounting modules to wall

surfaces

1. Plug the modules together, remove the module

covers.

2. Place the module assembly horizontally against the

wall surface in a suitable location, and mark the

mount hole locations on the mounting surface.

3. Install appropriate screws or fasteners, and leave

the screw heads approximately one to two turns

away from flush to the mounting surface.

4. Position the assembly mounting slots over the

screw heads, and then carefully tighten the

mounting screws to secure the assembly to the

surface.

Note: If you mount the modules on an uneven

surface, use shims or washers to mount the

module assembly evenly on the surface.

Wiring

See C450CCU condensing unit control module technical

specifications for electrical ratings.

WARNING

Risk of Electric Shock

Disconnect or isolate all power supplies before making

electrical connections. More than one disconnection

or isolation may be required to completely de-energize

equipment. Contact with components carrying

hazardous voltage can cause electric shock and may

result in severe personal injury or death.

AVERTISSEMENT

Risque de décharge électrique

Débrancher ou isoler toute alimentation avant

de réaliser un branchement électrique. Plusieurs

isolations et débranchements sont peut-être

nécessaires pour -couper entièrement l'alimentation

de l'équipement. Tout contact avec des composants

conducteurs de tensions dangereuses risque

d'entraîner une décharge électrique et de provoquer

des blessures graves, voire mortelles.

Important:

• You can connect a System 450 control module

and module assembly to an internal power

source, such as a System 450 power module, or an

external power source, such as 24 VAC/VDC power

that connects to the 24 V and COM terminals on

the control module. Do not connect a control

module to both power sources simultaneously.

If you connect a control module to both internal

and external power sources, you can damage the

modules and void any warranty.

• Use copper conductors only. Make all wiring

connections in accordance with local, national, and

regional regulations.

• Do not exceed the System 450 modules' electrical

ratings. Exceeding electrical ratings can result in

permanent damage to the modules and void any

warranty.

• Run all low-voltage wiring and cables separately

from all high-voltage wiring. It is best practice to

use shielded cable for input sensor cables that

are exposed to high electromagnetic or radio

frequency noise.

• Electrostatic discharge (ESD) can damage System

450 modules. Use proper ESD precautions when

you install and service the modules to avoid

damage to System 450 modules.

System 450 Series C450CCU Condensing Unit Control Module Installation Guide2

• Do not apply power to a C450YNN power module

or the 24 VAC/VDC power source for the System

450 modules before you finish wiring and

checking all wiring connections. Short circuits or

incorrectly connected wires can result in damage

to the modules and void any warranty.

• When you connect System 450 compatible sensors

with shielded cable to a System 450 control

module, connect the cable shield drain lead to one

of the C terminals on the input sensor terminal

block. Do not connect the shield at any other

point along the cable. Isolate and insulate the

shield drain at the sensor end of the cable. If

you connect a cable shield at more than one

point, transient currents can flow through the

sensor cable shield and can cause erratic control

operation.

• Labels are included with the C450CCU controller

that describe the Expansion Module LED and Relay

operation. Place the label or labels below the LED

relay indicator or indicators on the expansion

modules.

Table 2: System 450 wiring terminals and wire sizes

Terminal block

type

Terminal

label

Terminal function Wire sizes

24 V Provides a power terminal to

connect a 24 VAC input when

you do not use the C450YNN

module.

COM Provides a 24 VAC COM

terminal to connect a 24 VAC

COM input when you do not

use a C450YNN module.

This terminal is isolated from

the C terminal by a common

mode choke internal to the

control.

5 V Provides 5 VDC power for a

low-pressure pump down

transducer.

Sn1 Connect to an A99

temperature sensor only.

Sn2 Connect to an A99

temperature sensor or binary

switch input.

Sn3 Connect a specified P499 or

P598 pressure transducer only

for low-pressure pump down

control of the compressor.

Sensor and low-

voltage supply

power terminal

block

All control

modules

C Provides low-voltage common

connections for passive

or active sensors that you

connect to the 5 V, Sn1, and

Sn2 terminals.

The terminals connect

internally.

0.08 mm2 to 1.50 mm2

28 AWG to 16 AWG

Table 2: System 450 wiring terminals and wire sizes

Terminal block

type

Terminal

label

Terminal function Wire sizes

LNC1, LNC2 Connects equipment control

circuit to the line-voltage

normally closed (LNC) contact

on the single-pole, double-

throw (SPDT) relay.

LNC2 terminals are only

on control and expansion

modules with two output

relays.

LNO1,

LNO2

Connects equipment control

circuit to the line-voltage

normally open (LNO) contact

on the SPDT relay.

LNO2 terminals are only

on control and expansion

modules with two output

relays.

Line-voltage

output relay

terminal blocks

Control and

expansion

modules with

relay output

LC1, LC2 You must connect line power

to the line-voltage common

(LC) on the SPDT relay so that

the control module can switch

line voltage between the LNO

or LNC terminals to energize

connected equipment control

circuits.

LC2 terminals are only on

control and expansion

modules with two output

relays.

0.08 mm2 to 2.50 mm2

28 AWG to 14 AWG

240 VAC Left terminal is for one 240

VAC supply power lead.

No label on

the middle

terminal

Middle terminal is the

common connection for either

the 120 VAC or 240 VAC supply

power lead.

Line-voltage

supply power

terminal block

Power modules

only

120 VAC Right terminal is for one 120

VAC supply power lead.

0.34 mm2 to 2.50 mm2

22 AWG to 14 AWG

The following figure shows an example of a C450CCU

condensing unit control system module assembly and

the user-installed field wiring for a low-temperature

refrigeration application with temperature control, active

electric heat defrost control, and low-pressure pump down

control of the compressor.

Refer to the System 450 Series C450CCU Condensing

Unit Control System Technical Bulletin (LIT-12013266) for

additional application wiring diagrams.

Figure 2: C450CCU condensing unit control system

System 450 Series C450CCU Condensing Unit Control Module Installation Guide 3

Table 3: C450CCU condensing unit control system

Callout Description

1 Sn3 low-pressure pump down transducer. To control a compressor or

compressor starter with low pressure, connect a P499 Series pressure

transducer to Sn3, 5V, and C.

2 Sn1 refrigerated space temperature sensor. To control the refrigeration

output, either a compressor or a liquid line solenoid valve, connect an A99

Series temperature sensor to Sn1 and C on the input terminal block.

3 Sn2 defrost termination temperature sensor or switch. To terminate defrost

using evaporator temperature, connect an A99 Series temperature sensor or

user-supplied temperature switch to Sn2 and C on the input terminal block.

4 C450CCU condensing unit control module

5 C450YNN power module

6 C450SCN relay expansion module with two relay outputs

7 C450SCN relay expansion module with two relay outputs

8 OUTR1: output relay 1 terminal block. Connects to and controls the liquid

line solenoid valve based on the temperature sensed at Sn1, the refrigerated

space temperature sensor.

9 OUTR2: output relay 2 terminal block. Connects to and controls either a 1-

speed evaporator fan or the high-speed on a 2-speed evaporator fan, based

on the evaporator fan control selections you configure in the UI.

10 Power module line-voltage supply power terminals. Connect 120VAC

or 240VAC power to the appropriate terminals to provide power to the

condensing unit control system.

11 OUTR3: optional output relay 3 terminal block. Connects to and controls the

low-speed on a 2-speed evaporator fan.

12 OUTR4: output relay 4 terminal block. Connects to and controls the defrost

heater based on the condensing unit’s daily defrost schedule that you

configure. The temperature sensed at the defrost termination sensor or

switch or the configured defrost duration time terminates the defrost cycles.

13 OUTR5: output relay 5 terminal block. Connects to and controls compressor

pump down based on the suction pressure sensed at Sn3, the low-pressure

pump down transducer.

14 OUTR6: output relay 6 terminal block. Connects to and controls an optional

alarm output that may be used to provide an onsite notification of any active

alarm condition within the CCU.

Note: To provide OUTR2, OUTR3, OUTR4, OUTR5, and

OUTR6, you need a C450 expansion module.

Ordering information

Table 4: System 450 modules

Product code Product description

C450CCU-4C Condensing unit control module with LCD, four-button touchpad, UI,

and two SPDT line-voltage relay outputs

Included in the box: quantity of two A99BB-500C temperature sensors

with 5.00 m (16 3/8 ft) cable length

Sensor temperature range: -40ºC to 120ºC (-40ºF to 250ºF)

Cable jacket temperature range: -40ºC to 100ºC (-40ºF to 212ºF)

C450SBN-4C Relay expansion module with one SPDT relay output

C450SCN-4C Relay expansion module with two SPDT relay outputs

C450YNN-1C Power module; provides 24 V to System 450 module assembly; 120 VAC

or 240 VAC supply power input terminals

Note: Refer to the System 450 Series C450CCU

Condensing Unit Control System Technical Bulletin

(LIT-12013266) and the System 450 Series C450CCU

Condensing Unit Control System Catalog Page

(LIT-1901123) for more information.

Table 5: Mounting accessories

Product code Product description

BKT287-1R DIN rail; 0.30 m (12 in.)

BKT287-4R DIN rail; 0.36 m (14 in.)

PLT344-1R DIN rail end clamps (2 clamps)

WHA-C450-100C System 450 module connection extension cable, 100 cm (3.3 ft) long

Table 6: A99 Series temperature sensors

Product code Description

A99BA-200C Positive temperature coefficient (PTC) silicon sensor with shielded

cable; cable length 2 m (6.50 ft)