Rickard VSW 150 User manual

WBD WITH DEDICATED HEATER FITTED

FEATURES

FORM FACTOR

RICKARD diffusers are fitted with electric re-heaters that are either

housed in a modular sleeve (VCD1, VSD1, CCD3, CSD3, VSW1 &

CSW3’s) or fitted directly to the unit (WBD, VLN). The heaters are

energised when additional heating is required in a room.

Electric heating can be considered to save energy when they are

used to heat isolated offices that wouldn’t be efficiently heated by

raising the central plants temperature. The most efficient scenario in

heating is for the central plant to supply sufficient heated air to allow

most of the zones to be in control when the diffusers damper is

close to minimum position. Zones that are colder are controlled by

the diffuser opening further. Zones that cannot be satisfied by the

diffuser supplying warm air at full volume are toped up with supple-

mentary heating.

The most efficient scenario in cooling is for the central plant to sup-

ply sufficient cool air to allow most of the zones to be in control

when the diffuser dampers are close to minimum position. Zones

that are warmer can be controlled by the diffuser opening further.

Zones that cannot be warmed sufficiently by reducing the cold air

supply can be controlled by heating this reduced volume of air.

If the room temperature were to fall by 0.5°C below set point, the

Triac Controller will commence energizing the heater proportionally

and will fully energize the heater when the room temperature is ap-

proximately 1.5°C below set point.

To ensure a building is efficiently heated it is necessary to integrate

the Rickard VAV diffuser system with the central plant BMS. This is

possible by using Rickard’s MLM BMS Compatible Controls.

PROPORTIONAL HEATING

For accurate control of room temperature, the electric re-heater is

controlled on a step-less, proportional basis. In addition to having a

proportional output signal for cooling control, the temperature con-

troller also has a proportional output signal for heating.

This is done by means of a triac switching set (current valve) which

varies the heater output capacity by cycling the power supply to the

heater on and off –Pulse Width Modulation (PWM). This switching

takes place over a cycle of approximately 2 seconds and always oc-

curs at zero voltage to avoid radio frequency interference and volt-

age spikes. The “on” and “off” periods are varied in proportion to

the amount of heating required, i.e. a required heating capacity of

75% will result in an “on” period of 1.5 seconds and an “off” period

of 0.5 seconds.

CONTROLS

In a situation where multiple diffusers are controlled from a single

controller, each diffuser will be fitted with its own triac that will re-

ceive a heating signal from the Primary controller. From the table

“Maximum Recommended Heater Output (Watts)” at the end of this

section, notice that for each neck total pressure there is a specific

heater output quoted. For each diffuser size a standard heater capac-

ity is referenced e.g. in the case of a VCD 250 diffuser, the re-heater

sleeve would be factory fitted with a 1500 watt heater. By utilizing

the RICKARD MLM or MLM Interoperable BMS Compatible Controls,

the heater can be electronically set for an output from 100 to 1500W

to match the design engineer’s requirements. If the diffuser neck

total pressure were to be set to 50Pa and the minimum desired air

flow was 30% of maximum with a 17°C temperature rise, the heater

output for a VCD 250 should be set to 1350 watts. Please refer to

the MLM software help section for setup information.

IMPORTANT ELECTRICAL INFORMATION: Electrical reticulation

should be designed to manage the heaters full capacity i.e. when a

heater is set to 50%, the heater element draws the same current as it

would when set to 100% but only draws it for 50% of the time.

VAV PLATE DIFFUSER FITTED WITH MODULAR HEATER SPIGOT

SELECTION GUIDELINES

When calculating heater capacities for VAV diffusers, please keep in

mind that heating in the cooling mode takes place when the

diffuser is supplying minimum air flow. Care must therefore be

taken to ensure that excessive supply air temperature rises are

avoided. Discharge temperatures in excess of 32°C are likely to

cause stratification within the room. As a guide-line, the

temperature of the air leaving the diffuser should not be more than

10°C above room temperature. Please refer to the “Maximum

Recommended Heater Output (Watts)” table on page 3 for each

diffuser size. These heater output ratings calculated to ensure that

the heat rise is no more than 15°C in VAV diffusers and 10°C in CAV

diffusers. Please note that these values are a guide and are

calculated at 30% volume for VAV diffusers and 100% volume for

CAV diffusers.

IMPORTANT: These maximum capacities do not take into account

limitations of the triac which are rated at 12A maximum. This

reduces the capacity of the triac at low voltage supply.

ELECTRICAL AND OVERHEAT SAFETIES

NOTE: The following safeties should not exclude ducting airflow

safeties and a dedicated heater electrical circuit. Please see the

following Installation guidelines section.

Every Heater Module is fitted with a coiled electrical element inside

a Galvanised sheet metal enclosure. The heater elements is

constructed from an Incaloy material that does not glow when

energised. This element is selected to reduce the risk of combustible

materials igniting should they come into contact with the heater

element itself. No combustible materials are used in the

construction of a Rickard Diffuser or Heater Module. Rickard

diffusers use a high spec flame retardant, self extinguishing

polycarbonate plastic that is chlorine and bromine free with a UL94

V-0 rating at 1.5mm. The Heater modules are fitted with their own

Triac/Heater driver and receive a proportional signal from the

diffuser controls when heating is required. The Triac receives its

power from a separate power circuit. Dedicated plug tops can be

fitted to the heater module on request.

Each heater modules is fitted with a number of safeties to reduce

the risk of failure. The Triac is fitted inside an electrically grounded

metal enclosure that is physically attached to the heater module

enclosure. This increases the electrical safety of the device should a

short circuit occur. A fuse offers additional protection against large

current surges and shorts. A Transient suppressor prevents the Triac

from failing closed and therefore driving the heater permanently if a

voltage surge has occurred.

In some cases when no flow or very low flows occur in the ducting,

it is necessary to limit the heaters output to avoid excessive heat

build up in the diffuser. For this reason the triac is fitted with a

temperature sensor and controls to limit the triac so that the supply

air exiting the diffuser never rises above 50°C or 122°F.

As an added safety an auto-reset 65°±5°C or 149±9°F(10 000 cycles)

safety cut-out is fitted as standard. The reset temperatures indicates

the air temperature inside the overheat safety cut-out casing at

which it operates. Rickard heater modules are designed so that the

overheat safety cut-outs trigger when the neck Total pressure is

approximately 30Pa or below. The trigger point can vary depending

on a number of factors namely, excessively squashed or bent flex,

neck size, heater size and damper position. Rickard controls do not

activate its heaters below 20% flow damper position, thereby

reducing the likelihood of the overheat safeties not triggering in the

range described. Push-button type manual reset safeties are not

recommended in conjunction with diffuser re-heaters.

For additional safety, RICKARD offer an Airflow Switch to interrupt

power to the re-heater controls when there is insufficient airflow

across the heater element. The switch is calibrated to disable the

heater current valve below a static pressure of 12Pa (+/- 5Pa).

The switch operates as a dead man switch i.e. if the cable between

the switch and the heater controls is unplugged, the heater will not

operate.

TESTING

All electrical wiring associated with the re-heater is carried out in

the factory and all units are carefully tested for correct operation.

OPTIONS

• Heaters are available in various capacities, ranging from

0.5kW to 2.5kW.

• Airflow Switch to interrupt power to the re-heater controls

when there is insufficient airflow across the heater element.

STANDARD SAFETIES FITTED TO ALL VAV DIFFUSER TYPE

(VCD1, VSD1, CCD3, CSD3, VSW1, CSW, WBD’s , CLN’s and VLN’s )

Air flow Switch

Triac/current valve

Auto-reset Cut-out

OPTIONAL AIRFLOW CUT-OUT/SWITCH

Safety Temperature Sensor

INSTALLATION GUIDELINES

Your duct design should supply between 30 and 60Pa total pressure at each diffuser to ensure adequate flow across the heaters.

Please ensure the ducting is fitted with an airflow interlock/paddle switch that cuts the power to the electrical reticulation serving the

diffusers in the event of a loss of flow. This will ensure that the diffusers heaters are not energised when the AHU is off.

Rickard recommends a dedicated electrical outlet be fitted to the building heater reticulation and dedicated plug top be fitted to the

diffusers . This will ensure that the airflow interlock always cuts power to the diffusers heaters and not other equipment plugged into the

same circuit. This will also ensure that heaters are always plugged into a protected circuit.

Please see the “Electric Plug Ordering” Document for more details to order the correct plug top for your installation.

VCD

Recommended Heater sengs & sizing for a 15 Degree C Heat Rise @ 30% Open

Pa 20 30 40 50 60 70

Neck

Size

kW kW kW kW kW kW

Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set

150 0.35 0.50 70% 0.34 0.50 68% 0.50 0.50 100% 0.50 0.50 100% 0.60 0.75 80% 0.65 0.75 87%

200 0.60 0.75 80% 0.70 0,75 93% 0.75 0.75 100% 0.90 1.00 90% 1.00 1.00 100% 1.00 1.00 100%

250 0.85 1.00 85% 1.00 1.00 100% 1.15 1.25 92% 1.30 1.50 87% 1.40 1.50 93% 1.50 1.50 100%

300 1.00 1.00 100% 1.25 1.25 100% 1.50 1.50 100% 1.65 2.00 83% 1.75 2.00 88% 2.00 2.00 100%

350 1.30 1.50 87% 1.50 1.50 100% 1.85 2.00 93% 1.85 2.00 93% 2.25 2.50 90% 2.50 2.50 100%

VSW

Recommended Heater sengs & sizing for a 15 Degree C Heat Rise @ 30% Open

Pa 30 40 50 60 70

Neck

Size

kW kW kW kW kW

Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set

150 0,35 0,5 70% 0,4 0,5 80% 0,45 0,5 90% 0,5 0,5 100% 0,55 0,75 73%

200 0,6 0,75 80% 0,7 0,75 93% 0,8 180% 0,85 185% 0,9 190%

250 0,85 185% 11,25 80% 1,1 1,5 73% 1,2 1,25 96% 1,3 1,5 87%

300 11100% 1,2 1,5 80% 1,35 1,5 90% 1,5 1,5 100% 1,6 280%

VLN1

2 Slot

Paern

Recommended Heater sengs & sizing for a 15 Degree C Heat Rise @ 30% Open

Pa 30 40 50 60 70

Length kW kW kW kW kW

Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set

600 0,3 0,5 60% 0,35 0,5 70% 0,35 0,5 70% 0,4 0,5 80% 0,45 0,5 90%

900 0,45 0,5 90% 0,55 0,55 100% 0,6 0,75 80% 0,65 0,75 87% 0,7 0,75 93%

1200 0,65 0,75 87% 0,75 0,75 100% 0,8 180% 0,9 0,9 100% 11100%

1500 0,85 0,85 100% 11100% 1,1 1,25 88% 1,2 1,2 100% 1,3 1,5 87%

WBD

Recommended Heater sengs & sizing for a 15 Degree C Heat Rise @ 30% Open

Pa 20 30 40 50

Size (mm) kW kW kW kW

Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set

300/100 0,4 0,5 80% 0,5 0,5 100% 0,55 0,75 73% 0,6 0,75 80%

350/100 0,55 0,75 73% 0,65 0,75 87% 0,7 0,75 93% 0,75 0,75 100%

400/100 0,6 0,75 80% 0,75 0,75 100% 0,8 180% 0,9 190%

450/100 0,7 0,75 93% 0,8 180% 0,9 190% 11100%

500/100 0,7 0,75 93% 0,85 185% 0,95 195% 1,1 1,25 88%

550/100 0,75 0,75 100% 0,95 195% 1,1 1,25 88% 1,2 1,25 96%

600/100 0,9 190% 11100% 1,2 1,25 96% 1,25 1,25 100%

650/100 0,95 195% 1,15 1,25 92% 1,25 1,25 100% 1,45 1,5 97%

500/150 11100% 1,25 1,25 100% 1,6 280% 1,8 290%

550/150 1,2 1,25 96% 1,4 1,5 93% 1,65 283% 1,85 293%

600/150 1,4 1,5 93% 1,6 280% 1,9 295% 22100%

650/150 1,4 1,5 93% 1,7 285% 22100% 2,2 2,5 88%

700/150 1,5 1,5 100% 1,85 293% 2,2 2,5 88% 2,4 2,5 96%

800/150 1,75 288% 2,1 2,5 84% 2,5 2,5 100% 2,5 2,5 100%

To limit stratification in heating Rickard recommends that the heater outputs be limited to the values published in the tables above. The calculated values will

ensure that the heat rise is no more than 15°C in VAV diffusers and 10°C in CAV diffusers. Please note that these values are a guide and are calculated at 30%

volume for VAV diffusers and 100% volume for CAV diffusers. By adjusting the diffuser damper position down, a smaller volume will create a larger heat rise and

therefore increase the likelihood of stratification. The Fit column indicates the maximum fitted heater size recommended, the Adjust value indicates the maxi-

mum heater setting recommended to achieve a 15°C (VAV) or 10°C (CAV) heat rise and the Set column is the MLM Heater Output % value required to achieve a

15°C (VAV) or 10°C (CAV) heat rise.

To limit stratification in heating Rickard recommends that the heater outputs be limited to the values published in the tables above. The calculated values will

ensure that the heat rise is no more than 15°C in VAV diffusers and 10°C in CAV diffusers. Please note that these values are a guide and are calculated at 30%

volume for VAV diffusers and 100% volume for CAV diffusers. By adjusting the diffuser damper position down, a smaller volume will create a larger heat rise and

therefore increase the likelihood of stratification. The Fit column indicates the maximum fitted heater size recommended, the Adjust value indicates the maxi-

mum heater setting recommended to achieve a 15°C (VAV) or 10°C (CAV) heat rise and the Set column is the MLM Heater Output % value required to achieve a

15°C (VAV) or 10°C (CAV) heat rise.

CCD

Recommended Heater sengs & sizing for a 10 Degree C Heat Rise @ 100% Open

Pa 20 30 40 50 60 70

Neck Size

(mm)

kW kW kW kW kW kW

Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set

150 1.30 1.50 87% 1.50 1.50 60% 1.75 2.00 88% 2.00 2.00 100% 2.25 2.50 90% 2.40 2.50 96%

200 1.80 2.00 90% 2.25 2.50 90% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100%

250 2.30 2.50 92% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100%

300 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100%

350 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 200%

Max Element Size before extending spigot length: 150mm = 0.75kW, 200mm = 1.25kW, 250mm = 1.5kW, 300mm = 2.0kW, 350mm = 2.5kW

CSW

Recommended Heater sengs & sizing for a 10 Degree C Heat Rise @ 100% Open

Pa 20 30 40 50 60 70

Neck Size

(mm)

kW kW kW kW kW kW

Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set Adjust Fit Set

150 0.70 0.75 93% 0.80 1.00 80% 1.00 1.00 100% 1.00 1.00 100% 1.15 1.25 92% 1.25 1.25 100%

200 1.20 1.25 96% 1.30 1.50 87% 1.50 1.50 100% 1.75 2.00 88% 1.90 2.00 95% 2.00 2.00 100%

250 1.80 2.00 90% 2.00 2.00 100% 2.25 2.50 90% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100%

300 2.00 2.00 100% 2.40 2.50 96% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100% 2.50 2.50 100%

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