Installation, Operating, Maintenance
and After Sales Manual.
®
WHISPA III
5000, 9000 & 12000 RCU
heatingthroughinnovation.
Product Serial Number:
Installation Date:
Part Number: 1371056
01.06.2009 ISSUE 1
Issue 1
Tested to UL & CSA Standards
Contents
1.0 General Information 03
2.0 Heating System Design 03
3.0 Selection and Sizing for Heating 03
4.0 Location 03
5.0 Preparation 04
6.0 Electrical Connection 05
7.0 Water Connection 06
8.0 Technical Data 08
9.0 Operating Instructions 09
10.0 Troubleshooting 10
11.0 Maintenance 11
1.0 General Information
WHISPA III
®
5000, 9000 & 12000 RCU
03
G This MYSON WHISPA III®recessed commercial unit (RCU) is
designed for recessed wall applications where the use of
surface mounted units would not be appropriate. All units
have a one piece low profile front cover.
G WHISPA III
®
RCU fan convectors are designed to be used with
mono-flo Tees from a series loop, on a two pipe system, or as
a stand alone zone.
G WHISPA III
®
RCU fan convectors are available in three sizes,
and before proceeding with the installation the heating
system design must be considered and the unit correctly
selected to meet the heat loss requirement of the room.
G WHISPA III
®
RCU fan convectors are supplied with a fan speed
selector switch mounted on the front of the unit.
G WHISPA III
®
RCU fan convectors are supplied with built in
½" compression shut off valves for both the supply and
return.
G WHISPA III
®
RCU fan convectors are supplied with high
volume purge valve - air vents.
2.0 Heating System Design
The WHISPA III
mono-flo or venturi Tees, on a two pipe system or as a stand
alone zone.
For optimum fan convector performance the system must be
capable of providing sufficient hot water through the heat
exchanger. This means that:
1. Care must be taken in sizing both the pump and piping.
The minimum pipe size from the boiler to the fan convector
must be 1/2" copper tube.
2. Where the WHISPA III
emitters, mono-flo Tees or diverter Tees should be used to
provide adequate water flow.
®
RCU can be fitted on a series loop with
®
RCU is fitted on to a system with other
G WHISPA III
®
RCU fan convectors are supplied with an integral
combi - zone control and flow control valve, with a factory
fitted insert set to give 1 GPM. The flow rate through the unit
will not exceed this value, however, other inserts of 2 GPM or
3 GPM can be fitted by the installer to give higher flow rates.
G A low limit thermostat prevents the fan from operating if the
water temperature in the unit is below 110°F
G WHISPA III
®
RCU fan convectors are not designed for use with
steam.
G A 24V room thermostat, On – Off or set back type, can be
wired to this unit to give room temperature control.
G A time control can be wired to WHISPA III RCU fan convectors
to provide occasional coil purging flow through the coil if
considered necessary.
G All waterways are of copper. No lead brazing materials are
used to assemble this unit.
3. The system water must be above 110°F for fan to switch on,
and best results the mean water temperature should not be
below 140°F.
4. Optimum performance will require effective balancing of the
whole system.
5. The WHISPA III
®
RCU should not be used to replace a
radiator in an existing system unless an adequate flow of
water can be guaranteed through the unit.
6. The loop must be pumped. WHISPA III®RCU fan convectors
are not suitable for gravity circulation systems.
1.0
2.0
3.04.0
3.0 Selection and Sizing for Heating
G Heat output performance figures for the three sizes of
WHISPA III
Data section of this manual.
G Since WHISPA III
speed control, it is important to size the unit to match the
calculated heat loss requirements of the room with the unit
operating at the low fan speed (I).
®
RCU fan convectors are given in the Technical
®
RCU fan convectors are supplied with fan
4.0 Location
G The WHISPA III®RCU fan convector is designed for recessed
wall applications.
G WHISPA III
2" x 4" stud wall framing, with 5/16" thick cover
extending beyond the wall surface once installed.
®
RCU fan convectors are designed for normal
G The higher fan speed can then be used for more rapid
heating from cold in extreme conditions.
G When establishing the temperature difference, i.e. entering
water to room temperature, allowance should be made for
temperature drop in the system. It is the water temperature
at the fan convector that dictates the output.
G The size of the opening required to be cut for installation is
shown in Fig 1.
04
WHISPA III
®
5000, 9000 & 12000 RCU
5.0 Preparation
Before proceeding with the installation, unpack the carton
contents and check against the checklist below:
1. WHISPA III
2. Instruction manual.
3. Front cover.
4. Screw fixing kit.
G The WHISPA III
piping and wiring connections are made within the cabinet of
the unit itself. The installer should inspect the unit and note
that the ½" piping should enter on the lower right corner of
the unit and the 110V AC wiring for the unit enters on the
lower left hand corner of the unit, see Fig 2.
Dimensions of opening to be cut in wall
®
RCU.
®
RCU fan convector is designed so that the
141/2"
241/2"
G Prepare the opening in the wall to accept the unit as shown
in Fig. 1. Depending on the wall framing layout, the 9,000 and
12,000 models may require re-framing of the opening to
ensure proper support.
G Do not fit the unit at this stage.
195/16"
241/2"
5000 RCU
241/2"
Fig. 1
Note: All models require a depth of at least 3½".
9000 RCU
313/4"
12000 RCU
6.0 Electrical Connection
Line
(Supply) Ground
Neutral
T1 T2
Ground
Actu
Tr Ac T
WARNING: This appliance must be grounded.
WHISPA III
®
5000, 9000 & 12000 RCU
05
G The electrical installation must comply with local or national
wiring regulations.
G A hole is provided at the lower left hand corner of the unit
for a BX or Romex connector.
G Make electrical connection to the terminal block:
Black Lead – Hot 110V 60Hz
White lead – Neutral
Green – Ground
Do not energize the electrical supply until the remaining stages of the installation have been completed.
5.0
Fig. 2
6.0
06
C
B
A
WHISPA III
®
5000, 9000 & 12000 RCU
7.0 Water Connection
G This unit is supplied with ½" compression isolating valves.
Bring ½ " copper tubing to the unit and make the
compression joints. Connect the supply to the left hand
isolating valve. This is necessary to allow proper venting and
purging of the fan convector.
G The WHISPA III
regulator set at 1 GPM maximum. If another pre-set
maximum flowrate is required then the insert can be changed
at this stage. Unscrew the insert cap on the flow control valve.
Remove the insert and replace with the alternative. Replace
cap and tighten.
G Many installers are now beginning to use flexible heat tubing
to make these connections. Ensure prior to use that the
tubing selected is appropriate for the water temperature to
be supplied.
®
RCU fan convector is fitted with a flow
G Once the connections to the heating loop are complete, the
unit must be vented using the air purge valve. Fit a length of
hose to the purge valve so that any water from the heating
circuit escaping during the venting process can be directed
to waste, see Fig 3. Open the air purge valve by loosening
the screw.
G Open the left hand valve at the bottom of the unit and purge
the unit for 1-2 minutes. Close the LH valve and then open
the RH valve. Switch on the supply to the unit and energise
the flow control valve by switching on the room thermostat.
Purge the air from the unit, then close the RH valve and switch
off the room thermostat. Close the purge valve, disconnect
the hose and open both valves.
G When the operation of the unit has been tested, align and
secure the front cover (eight screws), see Fig 4.
Dimensions (in)
Model A B C
5000 143/16 135/8 103/8
7000 191/8 171/8 151/16
9000 315/8 291/4 271/8
Note: dimensions in inches.
Fig. 3
7.0 Water Connection (continued...)
Front cover
fixing screws
WHISPA III
®
5000, 9000 & 12000 RCU
07
Fig. 4
7.0
08
WHISPA III
®
5000, 9000 & 12000 RCU
8.0 Technical Data
Heating Performance Data
Model
5000 RCU
9000 RCU
12000 RCU
Fan Setting
High (II)
Low (I)
High (II)
Low (I)
High (II)
Low (I)
High (II)
Low (I)
High (II)
Low (I)
High (II)
Low (I)
Flowrate
(gpm)
3
1
3
1
3
1
Heat Output (Btu/h)
Entering Water Temperature (°F), Entering Air Temperature (65°F)
110 120 130 140 150 160 170 180 190 200
2040 2516 2997 3480 3967 4457 4949 5443 5939 6437
1749 2096 2437 2773 3104 3432 3756 4078 4397 4713
1795 2214 2637 3063 3491 3922 4355 4790 5226 5664
1539 1844 2144 2440 2732 3020 3306 3589 3869 4147
3759 4629 5504 6385 7271 8160 9053 9949 10848 11750
3266 3916 4556 5185 5807 6422 7031 7634 8233 8827
3308 4073 4844 5619 6398 7181 7967 8755 9546 10340
2874 3446 4009 4563 5110 5652 6187 6718 7245 7767
4369 5437 6524 7623 8739 9866 11003 12149 13307 14472
3019 3733 4454 5180 5911 6649 7389 8136 8887 9640
3845 4785 5740 6709 7690 8682 9682 10692 11709 12734
2657 3284 3918 4558 5202 5851 6504 7160 7819 8482
Maximum inlet water temperature 200°F
Heat outputs tested in accordance with BS 4856 Part 1
Electrical supply: 110V 60Hz
Max working pressure: 145psi
Water connections:
1
"
Sweat
/
2
Approximate Hydraulic Resistance through Units
g/min
3 4.90 6.89 13.1
1 0.75 1.07 1.4
5000 9000 12000
ft wg
Weight, Water Content and Motor Power
Model
5000 25 5 9.5
9000 40 11.5 14.2
12000 62 18.9 19
Motor
Power (W)
Water
Content (fl oz)
Unit Weight
(lbs)
Fig. 5 Wiring diagram
9.0 Operating Instructions
WHISPA III
®
5000, 9000 & 12000 RCU
09
WHISPA III®RCU fan convectors are controlled by the switch on
the front of the unit.
Ensure the electricity supply is switched on.
Heating Mode
The fan will only operate when
The central heating boiler is on
•
The pump is running
•
The system water temperature is greater than 110°F.
•
The room thermostat linked to the unit is switched on.
•
Ensure boiler is on, and set timer, boiler controls and room
thermostats as necessary.
G Set the fan speed switch to the LOW (I) position.
G The unit will now run on low fan speed. For satisfactory
operation the mean water temperature should not be below
140°F.
Operating Sequence
Power On
Timer On
Boiler On
Pump running
Select fan speed
Turn up room
thermostat
Solenoid valve
energises and valve
(1-2 seconds)
Temperature Control
The room thermostat setting should be adjusted to obtain the
desired temperature.
The fan speed can be set to boost by switching the fan speed
switch to II.
A low speed setting is recommended for normal operation with
the higher speeds for boost heating when required.
Low Limit Operation
The low limit thermostat fitted to the WHISPA III®RCU will
ensure that the fan stops after the heating system is switched
off and the water flow stops. If left in an operating position the
unit will automatically restart when the heating system is
reheated.
Off Position
Set the fan speed selector switch to the off position.
opens
Warm water flows
into coil. After 1-2
mins low limit stat
makes as coil
temperature rises
and fan starts.
Unit cycles on room
thermostat through
similar sequence
while heating is on.
8.09.0
10
WHISPA III
®
5000, 9000 & 12000 RCU
10.0 Troubleshooting
Once installed, this fan convector becomes an integral part of
the heating system that will also include boiler, pump, other
emitters such as radiators and fan convectors, and a number of
heating controls depending on system complexity. An apparent
Problem Remedy
Possible Causes
Room thermostat not calling for heat
Unit not switched on at breaker panel
Breaker tripped at panel
Heating Mode -
No Fan
Heating Mode
Water temperature reaching unit
below 110°F
Low water temperature to unit Turn up boiler thermostat
poor heating
performance and/or
unit cycles on
Poor water flow Vent air from heating system
low limit thermostat
problem with this unit may be the result of system controls being
incorrectly set, and can be solved easily without calling out your
installer or MYSON. Before calling out your installer or MYSON,
please carry out the checklist below.
Turn up room thermostat
Switch on breaker
Check all wiring, reset breaker
Check boiler -
Programmer ON
Boiler ON and set to high
Circulating pump running
Note: Operation of fan convector can be checked by
switching to summer setting
If the fan convector is still faulty after checking the above, call your installer or MYSON.
Common Installation Faults
For optimum performance, this unit must be correctly sized to
match the heat loss requirements of the space it is required to
Problem
Poor heating
performance
Unit incorrectly sized for heat loss of room
heat, and the heating system must be correctly designed to
provide adequate flow of hot water to the unit (see section 2). If
the recommendations in section 2 are not followed problems
may arise as detailed below.
Possible Causes
Boiler thermostat set too low
Lack of flow to fan convector Poor heating
performance
(unit may cycle on
low limit thermostat
System incorrectly balanced with unit starved of hot water flow
Pump set on low setting
Isolating valves not fully open
Pipe sizing to unit too small
Other Faults
Problem Remedy
No flow through unit,
and fan not operating
Possible Causes
Solenoid valve not energised
Solenoid valve not opening
Check room thermostat set correctly and
functioning
Check transformer output 24V
Check 24V actuator
11.0 Maintenance
WHISPA III
®
5000, 9000 & 12000 RCU
11
Before undertaking any maintenance activity isolate the
electrical supply.
Maintenance should be restricted to occasional removal of dust
and lint around the front cover plate.
The unit should be serviced periodically by a competent person.
Spares List
Motor / Fan Assembly WHISPA III® 5000 RCU 7100088 1
Motor / Fan Assembly WHISPA III®9000 RCU 7100090 1
Motor / Fan Assembly WHISPA III
Switch, 3 way 1300025 1
Low Limit Thermostat 1260007 1
Cover plate Whispa III 5000 RCU TBA 1
Cover plate Whispa III 9000 RCU TBA 1
Cover plate Whispa III 12000 RCU TBA 1
24V Actuator TBA 1
®
12000 RCU TBA 1
This should involve internal cleaning of the heat exchanger using
a soft brush or vacuum cleaner, taking care not to damage the
fan or heat exchanger.
Part NumberDescription Quantity
Transformer TBA 1
10.0
11.0
MYSON Inc. 948 Hercules Drive, Suite 5, Colchester, Vermont VT05446
T: (802) 654-7500, F: (802) 654 7022, info@mysoninc.com, www.mysoninc.com
heatingthroughinnovation.
01.06.2009 ISSUE 1
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