Tradewins Furniture RNC15 User's Manual

MODELS RNC15/RNC25
TM
HEAT RECOVERY VENTILATOR
INSTALLATION INSTRUCTION FOR HEAT RECOVERY VENTILATOR (HRV)
Shipping and Packing List
Application
Package 1 of 1 contains:
1 - Assembled ventilator
1 - Bag assembly containing:
2 - Drain spout assemblies (HRV units only)
4 - Hanging straps
1 - Installation manual
Heat Recovery Ventilators (HRV) are designed to provide
fresh air while exhausting an equal amount of stale air.
The HRV is equipped with an aluminum core. The device
uses the stale air that is being exhausted to condition the
fresh air as it is being brought in.
General
Required Tools
Installation Tools
•
•
•
•
•
•
•
•
tin snips
assorted screw drivers
electric drill
hammer
wire strippers
knife
caulking gun
smoke pencil
•
•
•
•
•
•
large zip ties
fabric flexible duct
- class II rated
mastic tape
alum. foil duct tape
zip ties
1/2” I.D. drain hose
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
Table of Contents
Shipping and Packaging List .................................................1
Required Tools ......................................................................1
Application .............................................................................1
General..................................................................................1
Balancing Tools
•
•
Pitot Tube Balancing Kit
[Case, 8 ft. vinyl tubing, Pitot tube,
magnehelic gauge (0 - 0.25”), and mounting plate]
Pitot Tube with instructions
and Digital Manometer (with resolution of
0 - 0.25” - must read to 1/100ths of an inch)
Optional Accessories
•
•
•
•
20 Minute Fan Timer
Wall Mounted Dehumidistat
Weather hood Kit
Round Diffuser
4” (100mm)
5” (125mm)
6” (150mm)
8” (200mm)
• Kitchen Grille
- may be required by code for kitchen applications
- contains removable grease filter
Engineering Data................................................................2-3
Clearances & Requirements..................................................4
Installation ..........................................................................4-7
Installation Diagrams .............................................................8
Electrical ...............................................................................9
Optional Controls.................................................................10
Operation.............................................................................11
Wiring Diagrams ..................................................................12
Interlocking HRV to Furnace ...............................................13
Air Flow Balancing..........................................................15-16
Troubleshooting...................................................................17
Maintenance .......................................................................18
* LEAVE FOR HOMEOWNER
NOTE: Due to ongoing research and product development, specifications,
ratings and dimensions are subject to change without notice.
TW-25
1206
Engineering Data - HRV
RNC15
THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE
The cross-flow heat recovery core transfers heat between the two air streams.
It is easily removed for cleaning or service.
MOTORS AND BLOWERS
Each air stream has one centrifugal blower driven by a common PSC motor.
FILTERS
Washable air filters in exhaust and supply air streams.
MOUNTING THE HRV
Four threaded inserts at corners of case designed to accept four PVC reinforced
polyester straps that are supplied with the unit.
DEFROST
Damper defrost system; defrosts automatically as the outdoor temperature falls.
CASE
Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD.
WEIGHT
87 lbs. (39.5 kg)
SHIPPING WEIGHT
89 lbs. (40.5 kg)
CONTROLS
HRV System Control
HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting
remote controls to designated terminals inside electrical box of HRV.
Standard LOW SPEED SETTING can be increased by manipulating switches in electrical box.
OFF(Standby)/LOW or OFF/HIGH speed operation also available by manipulating switches.
OPTIONAL ACCESSORIES
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.)
99-186
Weather Hoods, 2 - 6" (150mm) c/w 1/4" (6mm) screen
99-116
Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130
Dehumidistat Control - Dehumidistat
Performance
Net supply air flow in cfm (L/s) against external static pressure
E.S.P
RNC15
(external static pressure)
[cfm (L/s)]
@ 0.1" (25 Pa)
@ 0.2" (50 Pa)
@ 0.3" (75 Pa)
@ 0.4" (100 Pa)
@ 0.5" (125 Pa)
177 (83)
164 (77)
156 (73)
143 (67)
123 (58)
Max.Sensible Effectiveness
78%
-13°F (-25°C) outdoor air
72°F (22°C) 40% RH indoor air
Test Parameters
67cfm (32L/s)
Sensible Effectiveness 32°F (0°C)
76%
*Sensible Efficiency 32°F (0°C)
66%
*Sensible Efficiency -13°F (-25°C)
60%
**Latent Efficiency 95°F (35°C)
Total Efficiency 95°F (35°C)
0%
20%
VAC @ 60HZ
120
WATTS / [email protected]” W.C.
173
WATTS / Low @.3” W.C.
63
*Sensible Efficiency - thermal **Latent Efficiency - moisture
Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - includes parasitic losses from fan and defrosting
All units conform to CSA and UL standards.
Dimensions RNC15 inches (mm)
BLOWERS
STALE AIR
FROM INSIDE
26.5"
(673)
FRESH AIR
FROM OUTSIDE
DAMPER
*NOTE: Front clearance
of 25 inches (635 mm)
is recommended
for servicing unit.
DEFROST
PORT
CONDENSATE DRAINS
23.5"
(597)
STALE AIR
TO OUTSIDE
FRESH AIR
TO INSIDE
*All Duct Connections 6" (150mm)
FRONT VIEW
TOP VIEW
22.5"
(572)
SIDE VIEW
Warranty
Two year parts.
TM
Fifteen year aluminum core.
HEAT RECOVERY VENTILATOR
2
TW-03
0204
Engineering Data - HRV
RNC25
THERMALLY CONDUCTIVE, PATENTED ALUMINUM CORE
The cross-flow heat recovery core transfers heat between the two air streams.
It is easily removed for cleaning or service.
MOTORS AND BLOWERS
Each air stream has one centrifugal blower driven by a common PSC motor.
FILTERS
Washable air filters in exhaust and supply air streams.
MOUNTING THE HRV
Four threaded inserts at corners of case designed to accept four PVC reinforced polyester straps
that are supplied with the unit.
DEFROST
Damper defrost system; defrosts automatically as the outdoor temperature falls.
CASE
Twenty gauge prepainted galvanized steel (G60) for superior corrosion resistance. Insulated to
prevent exterior condensation. Drain connections two - 1/2" (12mm) OD.
WEIGHT
63 lbs. (28.7 kg)
SHIPPING WEIGHT
67 lbs. (30.4 kg)
CONTROLS
HRV System Control
HRV defaults to LOW SPEED when plugged in. HIGH SPEED option is accessible by connecting
remote controls to designated terminals inside electrical box of HRV.
Standard LOW SPEED SETTING can be increased by manipulating switches in electrical box.
OFF(Standby)/LOW or OFF/HIGH speed operation also available by manipulating switches.
OPTIONAL ACCESSORIES
99-132 20 Minute Fan Timer - (3 wire) 20 gauge wire (min.) 100’ length (max.)
99-186
Weather Hoods, 2 - 6" (150mm) c/w 1/4" (6mm) screen
99-116
Dehumidistat Ventilation Control - Dehumidistat with ON/OFF
99-130
Dehumidistat Control - Dehumidistat
Performance
Net supply air flow in cfm (L/s) against external static pressure
E.S.P
RNC25
(external static pressure)
[cfm (L/s)]
@ 0.1" (25 Pa)
@ 0.2" (50 Pa)
@ 0.3" (75 Pa)
@ 0.4" (100 Pa)
@ 0.5" (125 Pa)
214 (101)
206 (97)
193 (91)
184 (87)
170 (80)
Max.Sensible Effectiveness
69%
-13°F (-25°C) outdoor air
72°F (22°C) 40% RH indoor air
Test Parameters
127cfm (60L/s)
Sensible Effectiveness 32°F (0°C)
67%
*Sensible Efficiency 32°F (0°C)
60%
*Sensible Efficiency -13°F (-25°C)
59%
**Latent Efficiency 95°F (35°C)
Total Efficiency 95°F (35°C)
0%
20%
VAC @ 60HZ
120
WATTS / [email protected]” W.C.
182
WATTS / Low @.3” W.C.
70
*Sensible Efficiency - thermal **Latent Efficiency - moisture
Note: Effectiveness - based on temp. differential between the 2 airstreams
Efficiency - includes parasitic losses from fan and defrosting
All units conform to CSA and UL standards.
Dimensions RNC25 inches (mm)
BLOWERS
STALE AIR
FROM INSIDE
26.5"
(673)
FRESH AIR
FROM OUTSIDE
DAMPER
*NOTE: Front clearance
of 25 inches (635 mm)
is recommended
for servicing unit.
DEFROST
PORT
CONDENSATE DRAINS
23.5"
(597)
STALE AIR
TO OUTSIDE
FRESH AIR
TO INSIDE
*All Duct Connections 6" (150mm)
FRONT VIEW
TOP VIEW
22.5"
(572)
SIDE VIEW
Warranty
Two year parts.
TM
Fifteen year aluminum core.
HEAT RECOVERY VENTILATOR
3
0204
Clearances and Requirements
Connecting Appliances to the HRV
The following appliances should not be connected to the
HRV:
WARNING
Before installation, careful consideration must
be given to how this system will operate if
connected to any other piece of mechanical
equipment, i.e. a forced air furnace or air handler,
operating at a higher static. After installation, the
compatibility of the two pieces of equipment
must be confirmed, by measuring the air flows of
the ventilator, by using the balancing procedure
found in this manual.
• clothes dryer
• range top
• stovetop fan
• central vacuum system
CAUTION
Lint, dust or grease will collect in the HRV
damaging the unit.
It is always important to assess how the operation
of any HRV may interact with vented combustion
equipment (i.e. Gas Furnaces, Oil Furnaces,
Wood Stoves, etc.)
NOTE: Connecting any of these to the HRV will
invalidate your warranty.
NEVER install a ventilator in a situation where its
normal operation, lack of operation or partial
failure may result in the backdrafting or improper
functioning of vented combustion equipment!
Installation
The HRV unit must be installed in a horizontal position as
shown in the illustration below. The unit should be suspended using the provided hanging straps. If necessary,
the unit may be installed on a platform: however, the cabinet should be isolated from the platform to prevent
vibration transmission. The unit must be level. Sufficient
clearance at the front of the access door is required for
servicing the air filters and core. A minimum of 25"
(635mm) clearance is recommended so the door can be
opened. Four PVC reinforced polyester hanging straps are
provided for hanging the HRV from the basement floor
joists.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, personal injury or loss of life.
Installation and service must be performed by a
qualified installer or service agency.
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF
at disconnect switch(es). Unit may
have multiple power supplies.
Suspending the Unit
The hanging straps should be attached to the unit at the
top end corners (mounting screws are already located on
the HRV case). Securely fasten the other end of the straps
to the floor joists with wide head nails (not supplied), making sure the UNIT IS LEVEL. The straps are designed to
reduce the possibility of noise, resonance or harmonics;
therefore using the full length of the strap between the
HRV and the floor joists is recommended.
Location Selection
The HRV must be located in a heated space where it will
be possible to conveniently service the unit. Typically the
HRV would be located in the mechanical room or an area
close to the outside wall where the weather hoods will be
mounted. If a basement area is not convenient or does not
exist, a utility or laundry room may be used.
Weatherhood Location and Installation
Weatherhood kit includes two fixed-cover hoods with a
1/4” (6mm) mesh screen.
Exhaust Weatherhood Requirements
• At least 6' (2 m) from the ventilation air intake*
Attic installations are not normally recommended due to:
A) the complexity of work to install
• At least 18" (457mm) above ground or above the
depth of expected snow accumulation*
B) freezing conditions in the attic
C) difficulty of access for service and cleaning
4
Weatherhood Installation
CAUTION
SCREEN
(sideview)
Unit must be installed level to ensure proper
condensate drainage. Due to the broad range of
installation and operational conditions,
consideration must be given for the possibility
of condensation forming on the unit or
connecting ducting.
Objects below the
installation may be exposed to condensate.
COLLARISSUPPLIEDTO
ENSUREVAPOURBARRIER
IS100%SEALEDTO
WALLPLATE
12"galvanized
pipesupplied
• At least 3' (1 m) away from the corner of the building*
1/4"(6mm)SCREEN
(frontview)
• At least 3’ away from gas meter, electric meter or a
walkway where fog or ice could create a hazard*
EXTERIOR
WALL
1. ThermalCollarslidesovergalvanized
sleeveofWeatherhood.
2. FastenThermalCollartoBelt.
3. SlidetheInsulatedFlexibleDuctingover
theWeatherhood'sgalvanizedsleeveand
fastenittotheThermalCollar.
4. Hoodishingedtoallowforeasyaccess
forcleaningofbirdscreen.
• Not into a garage, workshop or other unheated space
When installing the weatherhood, its outside perimeter
must be sealed with exterior caulking.
* Local code may require greater distances.
Intake Weatherhood Requirements
• Should be located upstream (if there are prevailing
winds) from the exhaust outlet
• At least 6' (2 m) from the exhaust weatherhood *
• At least 6' (2 m) away from dryer vents and air handler
exhaust (medium or high efficiency furnaces)*
• A minimum of at least 6' (2 m) from driveways, oil fill
pipes, gas meters, or garbage containers, swimming
pools*
• At least 18" (457mm) above the ground, or above the
depth of expected snow accumulation*
• At least 3' (1 m) from the inside/outside corner of the
building*
• Do not locate in a garage, attic or crawl space
* Local code may require greater distances.
Weatherhood Clearances
OUTSIDE CORNER
36" (1m)
recommended min.
36" (1m)
recommended min.
INSIDE CORNER
CAUTION
Weatherhood arrangement - requires a minimum of 6'
(2m) separation and a minimum of 18" (460mm)
clearance above the higher of the grade or anticipated
snow level.
6' (2m)
recommended min.
INTAKE
18" (460mm) min.
EXHAUST
18" (460mm) min.
5
Air Duct Design and Installation
A well designed and installed ducting system will allow the
HRV to operate at its maximum efficiency.
WARNING
Include a short length of fabric, flex duct or
other non-metallic connector in the “Fresh Air to
Building” hard ducted line in order to keep the
HRV separately grounded (electrically) from the
air handler. This will avoid a possible shock
hazard to service people if a short to ground
develops in one of the devices.
Always try to keep duct runs as short and straight as possible. See Installation Diagrams for various installation
options.
The inner and outer liners of the flexible insulated duct
must be clamped to the sleeve of the weather hoods (as
close to the outside as possible) and the appropriate port
on the HRV. It is very important that the fresh air intake
line be given special attention to make sure it is well
sealed. A good bead of high quality caulking (preferably
Grilles that diffuse the air comfortably such as the Round
Diffuser are recommended.
If the floor is the only option available, then special care
should be taken in locating grilles. Areas such as under
baseboard heaters will help to temper the air. Also optional inline duct heaters are available for mounting in the
supply duct work to add heat if required.
silicone sealant) will seal the inner flexible duct to both the
HRV port and the weather hood prior to clamping with a
large zip tie.
To minimize air flow restriction, the flexible insulated duct
that connects the two outside weather hoods to the HRV
should be stretched tightly and be as short as possible.
Direct Connection to Air Handler Duct System
Should you wish to hard duct the fresh air from the HRV
directly into the cold air return of the air handler, remember to check the air flow balance of the HRV with the air
handler fan both "ON" and "OFF" to determine that it does
not imbalance the unit more than 10%.
Twisting or folding the duct will severely restrict air flow.
See below for the recommended connection of flexible
insulated ducts to the the outside weather hoods and the
HRV.
Installing the Ducting Between
the HRV & Living Areas in the House
To maximize airflow in the duct system, all ducts should
be kept short and have as few bends or elbows as possible. Forty-five degree elbows are preferred to 90° elbows.
Use “Y” tees instead of 90° elbows whenever possible.
Indirect Connection to Air Handler Duct System
If permitted by local codes, an indirect connection may be
made between the HRV fresh air duct and the air handler
return plenum. The fresh air from the unit may be directed
at a grille installed in the cold air return duct of the air handler. The fresh air outlet from the HRV should be no closer
than 4 inches (100mm) and no more than 12 inches
(300mm) from the grille.
All duct joints must be fastened with screws, rivets or duct
sealant and wrapped with mastic or a quality duct tape to
prevent leakage. Mastic is preferred but if duct tape is
used, we recommend aluminum foil duct tape.
Galvanized ducting from the HRV to the living areas in the
house is recommended whenever possible, although flexible duct can be used in moderation if necessary.
FRESH AIR
FROM HRV
To avoid possible noise transfer through the duct system,
a short length (approximately 12 inches or 300mm) of nonmetallic flexible insulated duct should be connected
between the HRV and the supply/exhaust duct system.
4" MINIMUM
12" MAXIMUM
V
HR
The main supply and return lines to/from the HRV must be
6 inches (150mm) minimum. Branch lines to the individual
rooms may be as small as 4 inches (100mm), but 5 inch
(125mm) lines are preferred .
All ducts running through attics and unheated spaces must
be sealed and insulated to code.
Fresh Air Ducting
In applications that do not include an air handler, fresh air
should be supplied to all bedrooms and living areas,
excluding bathrooms, kitchen and utility areas. Grilles
should be located high on a wall or in ceiling locations.
6
RETURN AIR
DUCT FOR
AIR HANDLER
Stale Air Exhaust System
The stale air exhaust system draws air from the points in
the house where the worst air quality problems occur.
Stale air ducts should be installed in the bathroom,
kitchen, and laundry room. Applications such as greenhouses, atriums, swimming pools, saunas, etc. have
unique ventilation requirements which should be
addressed with an isolated ventilation system. Also, the air
handler return duct may be used to exhaust from. In this
method, the exhaust air is not ducted back to the HRV
with "dedicated lines" from bathrooms, kitchens, etc.
Instead, the exhaust air is drawn out of the cold air return
of the air handler. The air handler blower must be running when the unit is operating for this system to be
effective.
Drain Connection (HRV Only)
During a defrost cycle, the HRV may produce some condensation. This water should flow into a nearby drain, or
be taken away by a condensate pump.
CAUTION
The HRV and all condensate lines must be
installed in a space where the temperature is
maintained above the freezing point or freeze
protection must be provided.
The HRV cabinet has prepunched holes for the drain (see
below). Insert the drain spout through the hole in the drain
pan. Do not forget the “O ring” which seals each spout to
the pan. REMEMBER TO HAND TIGHTEN ONLY the
washer and lock nut which hold the drain spout in place.
CAUTION
Construct a P-Trap using the plastic tee connector. Cut
two lengths of hose and connect each piece to an end of
the “T” fitting, then connect the other ends to the two drain
spouts. Position the "T" fitting to point upward, andconnect
the drain line. Tape or fasten base to avoid any kinks. This
creates a “trap” which will hold some condensate and prevent odors from being drawn up the hose and into the
fresh air supply of the HRV.
Balancing Dampers and Grilles
Balancing dampers and/or adjustable grilles should be
used to balance the flow rates into and out of various
rooms.
Grilles or diffusers should be positioned high on the wall or
in the ceiling. Kitchen exhaust grilles must never be connected to a range hood. They should be installed at least 4
feet (1.2m) horizontally away from the stove. A hinged
6”X10” (150 X 250mm) rectangular kitchen exhaust grille
is available as part number. This grille includes a removable grease filter. Canadian building codes require that
kitchen grilles be equipped with washable filters.
"P" Trap (HRV only)
DRAIN HOSE PLUMBING
PRE-PUNCHED HOLES (2)
DRAIN PAN
DRAIN PAN
DRAIN
SPOUT
Field-supplied balancing dampers should be installed
external to the unit to balance the amount of stale air
being exhausted with the amount of fresh air being
brought into the house. Refer to Air flow Balancing section.
DRAIN
SPOUT
ZIP TIE
TEE
CONNECTOR
1/2 " I.D.
DRAIN HOSE
TO DRAIN
HARD PIPE PLUMBING
Kitchen Grille
PRE-PUNCHED HOLES (2)
REMOVABLE
FILTER
DRAIN PAN
DRAIN
SPOUT
The Round Diffuser is available in
4" (100mm)
5” (125mm)
6" (150mm)
8" (200mm)
DRAIN PAN
1/2" HARD PIPE
TEE
JOINT
Round
Diffusers
DRAIN
SPOUT
TO DRAIN
Note: Secondary drain pan may be required to
protect from condensate leakage.
7
Installation Diagrams
HRV
DIRECT CONNECTION of the SUPPLY AIR STREAM to the FURNACE COLD AIR RETURN
EXHAUST AIR
from various parts of
home. (i.e. bathrooms, kitchens)
Return Air
3’ min.
recommended
Outdoors
Cool Air
Return
Forced Air
Furnace
NOTES:
1. Furnace blower is required to operate when HRV is ON to provide good air distribution.
2. No separation requirements necessary between direct connection point and furnace.
3. Weatherhood arrangement is for drawing purposes only. 6' (2 m) minimum separation required.
18" (460 mm) above grade minimum.
4. Due to the differences in pressure between the HRV and the epuipment it is being
connected to, the HRV's airflow must be confirmed on site, using the balancing
procedure found in this manual.
*Unit is normally balanced on HIGH speed
with furnace blower ON.
DIRECT CONNECTION of the SUPPLY AIR STREAM to the FURNACE COLD AIR RETURN
Return Air
EXHAUST AIR
from various parts of
home. (i.e. bathrooms, kitchens)
Balancing
damper*
3’ min.
recommended
Outdoors
Balancing
damper*
Cool Air
Return
*Unit is normally balanced on HIGH speed
with furnace blower ON.
NOTES:
1. Furnace blower is required to operate when ventilation from HRV is require. The furnace should be set to run continuously.
2. A minimum separation of 40 inches (1 m) is required between the two direct connections.
3. The exhaust air connection should be upstream of the supply air connection to prevent exhausting any fresh air.
4. Weatherhood arrangement is for drawing purposes only. 6' (2 m) minimum separation required. 18" (460 mm) above grade minimum.
5. Due to the differences in pressure between the HRV and the epuipment it is being
connected to, the HRV's airflow must be confirmed on site, using the balancing procedure found in this manual.
8
Forced Air
Furnace
Electrical
The HRV unit should be plugged into a standard designated (120VAC) electrical outlet with a ground. The outlet
should be serviced by a separate 15 amp/120V circuit. An
extension cord should not be used with this appliance. A
qualified service technician should make any required
electrical connections.
WARNING
In order to prevent electric shock when cleaning
or servicing the HRV, it is extremely important to
confirm the polarity of the power line that is
switched by the safety (disconnect) switch. The
hot line (black) is the proper line to be switched.
To confirm the proper polarity, use a voltmeter
or test lamp to ensure there is no power after
the switch when the door is open. Check
between that point and ground (on the cabinet).
Always make sure that the HRV is properly
grounded.
Remote Control Connections
Low voltage connections between the remote controls, the
dehumidistat, or the fan timer should be made by a qualified service technician. Low voltage wires from the remote
controls are connected to the HRV micro-processor board.
9
Optional Controls
Optional Remote Control Devices
Low Voltage
DEHUMIDISTAT VENTILATION CONTROL (D.V.C.)
AT
DEHUMIDIST
* remove jumper on circuit board
when using this control
** requires 3 wires
• Designed for a central location
• Ventilation control turns HRV system ON and OFF
• Dehumidistat increases ventilation when required
• High speed override switch
• Great for building code requirements
• Low voltage
• Connect one per HRV only
• Connects to red, black and orange
Part No. 99-116
REMOTE DEHUMIDISTAT
*requires 2 wires
• anywhere humidity is a concern
• provides high speed ventilation when ..humidity level exceeds
selected setting
• Connects to red and black
Part No. 99-130 White
20 MINUTE TIMER
*requires 3 wires
• provides high speed for 20 minutes
• maximum wire length 100’
• connect up to 4
• connects to red, black and green terminals
Part No. 99-132
10
Operation
For most installations the HRV will normally be set to operate continuously on low speed. To suit various lifestyles,
the HRV offers a selection of operating modes.
Self Test
The ventilator will automatically initiate a self test
sequence when power is applied. Fan motor is cycled and
then damper motor is cycled. Duration: Approximately 1.5
mins.
Method of Operation
Good -
intermittent operation at all times
How much ventilation do I need?
Better-
During seasons when your windows and doors are closed
(winter and summer if air conditioned) the HRV should
operate continuously when the dwelling is occupied, and
either continuously or intermittently when not occupied.
continuous operation during day or occupied
conditions, intermittent at night or unoccupied
Best -
recommended continuous operation of both
HRV and furnace/air handler blower
Mode DIP Switch Settings
Figure 1 - Factory DIP Switch Settings
Figure 2-DIP Switch Settings for Standby (When
using a Remote Control Device that has an
ON/OFF Switch)
The factory setting of the DIP switches (located on the circuit board) provides continuous low speed ventilation.
Optional Remote Controls will initiate high speed ventilation.
This DIP Switch Setting can be adjusted when using a
system control that has an ON/OFF switch (refer to
"Remote Control Devices" in this manual). "STANDBY" is
achieved when the Remote Control Switch is in the "OFF"
position. The Dehumidistat and Timers will initiate high
speed ventilation regardless of the "ON/OFF" switch position when this DIP switch configuration is used.
Remote controls with an ON/OFF switch (refer to "Remote
Control Devices" in this manual) will shut the entire system down when the remote control is in the OFF position.
Changing the remote control from OFF to STANDBY can
be achieved by Setting the DIP Switch as per Figure 2.
ON
Figure 2
Figure 1
ON
HS
REMOTE
HS
DFR2
REMOTE
DFR3
DFR2
DFR3
ATTENTION
Figure 2 may not meet building code conformance
in certain geographical areas. Check with your
local building authority.
Increasing Low Speed to Medium Low
The ventilator automatically operates on its lowest speed
when plugged in or switched on. This setting is factory
supplied from an autotransformer with two selectable low
speeds. To switch to a continuous medium low speed, an
installing contractor must interchange the red and blue
wires from the autotransformer inside the electrical box.
Whether or not this change is made, the HRV will only be
able to access a single selected low speed.
High speed is available with the use of optional remote
controls connected to the appropriate terminals inside the
electrical box.
11
Wiring Diagrams
RNC3WIRINGDIAGRAM
LEGEND
HIGHVOLTAGE
12VLOWVOLTAGE
AUTO
TRANSFORMER
120V
POWER
SUPPLY
RED
BLACK
BLUE
WHITE
WHITE
FANMOTORDETAILS
INTERFACE
RELAYCONTACTS
BLACK
FIELDINSTALLED
12VLOWVOLTAGE
TO
MOTOR
BLACK
T6
T9
GREEN
GREEN
AUTOTRANS
ORANGE
YELLOW
CAPACITOR
T2
ITE
WH
D
RE
T3
T4
T5 T6
SPARE
NEUTRAL
T8
T7
LINE
T9
FAN O/P
N/C COMMON N/O
T10
T11
T12
8
K4
T1
C4
SEE
DEFROST
DETAIL
C5
GROUND
P1
VDR2
DIRECTMOUNTEDCAPACITOR
VDR3
K1
ModelRNC5(Only)
PCBPLUG-IN
1
3/4AMPFUSE
DEFROSTDETAILS
BLACK
ORANGE
ORANGE
RED
BLACK
DEHUMIDISTAT
-
+
C1
2
BI-DIRECTIONAL
DAMPERMOTOR
3
GREEN
LEDDRIVE
RECIRCULATE
CR1
4
BLUE
P3
THERMISTOR
LOWFAN
ON
12VAC
P4
PIN1-RED
PIN2-ORANGE
PIN3-BLACK
PIN4-SPARE
RED
+12V
ORANGE
OBCS
VDR1
P1
BLACK
K3
FACTORY
INSTALLED
JUMPER
PLUGIN
CONNECTOR
RED
K2
GREEN
GROUND
HS
REMOTE
DFR2
DFR3
RED
NONFUNCTIONAL
FUTURE USE
TERMINALS
COMMS
1 P5
P2
DEHUMIDISTAT
SW1
PCBPLUG-IN
1
2
P1
PLUGIN
CONNECTOR
BI-DIRECTIONAL
DAMPERMOTOR
BLACK
BLACK
ORANGE
ORANGE
RED
RED
3
4
INTERNAL
DEHUMIDISTAT
(IFAPPLICABLE)
PIN1-BLACK
PIN2-ORANGE
PIN3-RED
PIN4-SPARE
WALLMOUNTEDDEHUMIDISTAT
20MINUTEFANTIMER
DVC
*Removefactoryinstalled
jumperoncircuitboard
BlacktoBlack(Dehumidistat)
distat
Dehumi
to
Relative
Setting
ns
Conditio
Outside
:
WINTER at
idist
Setdehum to40%.
30%
between
stoodry, .
Ifhomei
tting
higherse id,
adjustto
hum
stoo
Ifhomei
tting.
lowerse
adjustto
TAT
DEHUMIDIS
RedtoRed(12V)
RedtoRed(12V)
BlacktoBlack(Dehumidistat)
BlacktoBlack(Dehumidistat)
RedtoRed(12V)
GreentoGreen(LEDDrive)
OrangetoOrange(OBCS)
:
SUMMER at
idist
Setdehum
toOFF.
98-RNC3-001INSHRV
0104
12
Interlocking HRV Operation to an Airhandler/Furnace Blower
When using the Interface relay contacts to initiate blower operation on a furnace, certain thermostats will initiate the outdoor cooling condenser when
R and G are closed.
Use this wiring configuration to prevent the Interface relay contacts from initializing
the condenser unit. This problem can occur at the thermostat because the Y terminal is connected to the G terminal internal to the stat. When R and G are closed at
the furnace (by dehumidistat or relay) 24 Volts is sent to G at thermostat. 24 Volts is
then sent through Y which will initiate outdoor condenser.
13
Dehumidistat Operation (HRV only)
The optional HRV remote controls include a dehumidistat
which controls humidity levels during the heating season.
The control has a selector knob with set points ranging
from 20% to 80% relative humidity (RH). Most people are
comfortable when indoor relative humidity levels are in a
range from 30 to 45%.
The dehumidistat switches the ventilator to high speed
when the moisture level in the building exceeds the
desired setpoint. The dehumidistat switches the HRV back
to low speed ventilation when the humidity has been
reduced below the setpoint. The dehumdistat should
only be used during the heating season. It must be set
to OFF position throughout the rest of the year.
Defrost Operation
Damper Defrost
The damper defrost HRV has an electronically controlled
damper defrost mechanism. The defrost timer is activated
when the outside temperature drops below 27°F (-3°C). A
motor driven damper door mechanism closes off the supply air from ouside allowing the exhaust air to recirculate
through the unit. After the defrost period, the damper operates in the opposite direction to reopen the fresh air port.
Defrost cycle repeats until the temperature again rises
above 27°F (-3°C).
CAUTION
Lengthening the run time may result in ice
buildup on the core.
Defrost Cycle DIP Switch Settings
Defrost DIP Switch Settings (located on the circuit board)
can be adjusted to increase the unit’s run (ventilation)
time. The three minute defrost time cannot change.
Factory Setting
3 minute defrost time
17 minute run time
Option 1*
3 minute defrost time
25 minute run time
ON
Option 2*
3 minute defrost time
30 minute run time
ON
ON
HS
HS
HS
REMOTE
REMOTE
REMOTE
DFR2
DFR2
DFR2
DFR3
OFF
SW1
DFR3
ON
SW1
OFF
DFR3
ON
SW1
*Lengthening the run time may result in ice build-up on the core.
14
Air Flow Balancing
The first step is to operate all mechanical systems on high
speed, which have an influence on the ventilation system, i.e.
the HRV itself and the air handler, if applicable. This will provide the maximum pressure that the HRV will need to
overcome, and allow for a more accurate balance of the unit.
Drill a small hole in the duct (about 3/16"), three feet downstream of any elbows or bends, and one foot upstream of any
elbows or bends. These are recommended distances but the
actual installation may limit the amount of straight duct.
The Pitot tube should be connected to a magnehelic gauge or
digital manometer capable of reading from 0 to 0.25 in. (0-62
Pa) of water, preferably to 3 digits of resolution. The tube
coming out of the end of the Pitot is connected to the high
pressure side of the gauge. The tube coming out of the
branch of the Pitot is connected to the low pressure or reference side of the gauge.
Insert the Pitot tube into the duct; pointing the tip into the air
flow.
For general balancing it is sufficient to move the Pitot tube
around in the duct and take an average or typical reading.
Repeat this procedure in the other (supply or return) duct.
Determine which duct has the highest air flow (highest reading on the gauge). Then damper that air flow back to match
the lower reading from the other duct. The flow should now
be balanced.
Actual air flow can be determined from the gauge reading.
The value read on the gauge is called the velocity pressure.
The Pitot tube comes with a chart that will give the air flow
velocity based on the velocity pressure indicated by the
gauge. This velocity will be in either feet per minute or meters
per second. To determine the actual air flow, the velocity is
multiplied by the cross sectional area of the duct being measured.
This is an example for determining the air flow in a 6" duct.
The Pitot tube reading was 0.025 inches of water.
From the chart, this is 640 feet per minute.
The 6" duct has a cross sectional area of
= [3.14 x (6"÷12)2]÷4
= 0.2 square feet
The air flow is then:
640 ft./min. x 0.2 square feet = 128 cfm
For your convenience, the cross sectional area of some common round duct is listed below:
It is necessary to have balanced air flow in an HRV. The volume of air brought in from the outside must equal the volume
of air exhausted by the unit. If the air flow is not properly balanced, then:
• The HRV may not operate at its maximum efficiency
• A negative or positive air pressure may occur in the house
• The unit may not defrost properly
• Failure to balance HRV properly may void warranty
CAUTION
Ensure balanced air flow in HRV. Excessive
positive pressure may drive moist indoor air into
the external walls of the building where it may
condense (in cold weather) and degrade
structural components. May also cause key
holes to freeze up.
Excessive negative pressure may have several undesirable
effects. In some geographic locations, soil gases such as
methane and radon gas may be drawn into the home through
basement/ground contact areas.
WARNING
Ensure balanced air flow in HRV/ERV. Excessive
negative pressure may also cause the backdrafting of vented combustion equipment.
Read the Application Warning in Clearances & Requirements section of this manual!
Prior to balancing, ensure that:
1. All sealing of the duct system has been completed.
2. All of the HRV’s components are in place and
functioning properly.
3. Balancing dampers are fully open.
4. Unit is on HIGH speed.
5. Air flow in branch lines to specific areas of the house
should be adjusted first prior to balancing the unit. A
smoke pencil used at the grilles is a good indicator of
each branch line's relative air flow.
6. After taking readings of both the stale air to the HRV duct
and fresh air to the house duct, the duct with the lower
CFM ([L/s] velocity) reading should be left alone, while the
duct with the higher reading should be dampered back to
match the lower reading.
7. Return unit to appropriate fan speed for normal operation
DUCT DIAM. (inches)
5
6
7
CROSS SECTION AREA (sq. ft.)
0.14
0.20
0.27
The accuracy of the air flow reading will be affected by how
close to any elbows or bends the readings are taken.
Accuracy can be increased by taking an average of multiple
readings as outlined in the literature supplied with the Pitot
tube.
8. A field-supplied balancing damper for the stale air side
is required for system balancing.
Balancing Procedure
The following is a method of field balancing an HRV using a
Pitot tube, which is advantageous in situations when flow stations are not installed in the duct system. Procedure should
be performed with the HRV on high speed.
15
Pitot Tube and Gauge
Pitot Tube Air Flow
Balancing Kit
DUCT
with magnehelic gauge,
Pitot tube, hose and
carry case.
AIR
FLOW
Pitot tube
Magnehelic gauge
High Pressure Side
IC
EL
MAGNEH
Low Pressure Side
Placement of Pitot Tube HRV
NOTE: Graphic is for illustrative purposes only.
Duct connection ports may vary.
Place pitot tube a minimum of 18" from blower or elbows
Outdoors
Note: Duct connections may vary,
depending on model.
Pitot
tube
MAGNEHELIC
Field-supplied
Balancing Damper
(optional)
Magnehelic
gauge
Balancing
Damper
Pitot
tube
Magnehelic
gauge
MAGNEHELIC
NOTE: Apply use of balancing dampers as required.
16
Troubleshooting
Symptom
Cause
Solution
Poor Air Flow
•
•
•
•
•
•
•
•
•
• clean exterior hoods or vents
• remove and clean filter
• remove and clean core
• check and open grilles
• open and adjust dampers
• have electrician check supply voltage at house
• check duct installation
• increase the speed of the HRV
• have contractor balance HRV
Supply air feels cold
• poor location of supply grilles, the air flow may irritate
the occupant
1/4” (6mm) mesh on the outside hoods is plugged
filters plugged
core obstructed
house grilles closed or blocked
dampers are closed if installed
poor power supply at site
duct is restricting HRV
improper speed control setting
HRV air flow improperly balanced
• outdoor temperature extremely cold
• locate the grilles high on the walls or under the baseboards,
install ceiling mounted diffuser or grilles so as not to directly
spill the supply air on the occupant (eg. over a sofa)
• turn down the HRV supply speed. A small duct heater
(1kw) could be used to temper the supply air
• placement of furniture or closed doors is restricting themovement of air in the home
• if supply air is ducted into air handler return, the air handler
fan may need to run continuously to distribute ventilation air
comfortably
Dehumidistat is not Operating
• improper connection to ventilator
• external low voltage is shortened out by a staple or nail
• check dehumidistat setting it may be on OFF
• check that the correct terminals have been used
• check external wiring for a short
• set the dehumidistat at the desired setting
Humidity Levels are too High in Winter
Condensation is appearing on the
windows
• dehumidistat is set too high
.• lifestyle of the occupants
• set dehumidistat lower
• avoid hanging clothes to dry, storing wood and venting
clothes dryer inside. Heating wood may have to be moved
outside
• vent crawl space and place a vapor barrier on the floor of the
crawl space
• ducts from the washroom/bathroom should be sized to
remove moist air as effectively as possible, use of a washroom/bathroom fan for short periods will remove additional
moisture
• timer or fan can be added to washroom/bathroom exhaust
• on humid days, as the seasons change, some condensation
may appear but the home’s air quality will remain high with
some HRV use
• increase speed of the HRV
• moisture coming into the home from an unvented or
unheated crawl space
• moisture is remaining in the washroom/bathroom and
kitchen areas
• condensation seems to form in the spring and fall
• HRV is set at too low a speed
Humidity Levels are too Low
•
•
•
•
dehumidistat control set too low
blower speed of HRV is too high
lifestyle of occupants
HRV air flow may be improperly balanced
HRV and / or Ducts Frosting up
• HRV air flow is improperly balanced
• malfunction of the HRV defrost system
• set dehumidistat higher
• decrease HRV blower speed
• humidity may have to be added through the use of humidifiers
• have a contractor balance HRV air flow
• Note: minimal frost build-up is expected on cores before
unit initiates defrost cycle functions
• have HVAC contractor balance the HRV
• ensure working properly.
Condensation or Ice Build Up in
Insulated Duct to the Outside
• incomplete vapor barrier around insulated duct
• a hole or tear in outer duct covering
• tape and seal all joints
• tape any holes or tears made in the outer duct covering
• ensure that the vapor barrier is completely sealed
Water in the bottom of the HRV
•
•
•
•
•
• ensure O-Ring on drain nozzle sits properly
• look for kinks in line
• check water drain connections
• make sure water drains properly from pan
drain pans plugged
improper connection of HRV drain lines
HRV is not level
drain lines are obstructed
HRV heat exchange core is not properly installed
17
Maintenance
HRV
1. Inspect Exterior Hoods at least once a month.
Make sure exhaust and fresh air supply hoods are not
blocked or restricted by leaves, grass, or snow. In winter, it
is especially important to make sure snow is not blocking
the hoods or that frost has not built up on the wire mesh
(bird screen).
6. Clean Duct System if Required
The duct system running to and from the HRV may accumulate dirt. Wipe and vacuum the duct once every year.
You may wish to contact a Heating/Ventilation company to
do this.
WARNING: Blockage of hoods may cause an imbalance.
Wipe down the inside of the cabinet with a damp cloth to
remove dirt, bugs and debris that may be present.
7. General Maintenance - Twice a Year
2. Clean Air Filters - Twice a Year
The standard filters equipped with your HRV are removable and washable.
a) simply open access door and slide core out
8. Cleaning the Fans
Fans may accumulate dirt causing an imbalance and/or
excessive vibration of the HRV. A reduction in the air flow
may also occur. In new construction this may result within
the first year due to heavy dust and may occur periodically
after that over time depending on the outdoor conditions.
b) remove filter clips
c) once clips are removed filters can be taken off the
core to be rinsed with water or a combination of mild
soap and water. Do not clean in the dishwasher
d) to re-assemble, place clean filter(s) (wet or dry) back
into their positions against the core and return clips to
their original position
•
unplug the HRV and open the service door
•
remove the core
•
remove ducting (metal and/or flexible insulated type)
from the red and/or blue ports which are connected
immediately inline with the fan assembly
•
use a small brush, such as a toothbrush or pipe
cleaner, and insert first
e) slide core back into its original position
3. Clean Core - Twice a Year
a) open access door
b) carefully grip ends of core and pull evenly outward.
-core may be snug, but will slide out of the channel
(a) through the large opening of the fan assembly and
then
c) once removed from the cabinet remove filters
(b) through the smaller opening in the end of the fan
assembly
d) wash core in warm soapy water
(do not use dishwasher)
•
scrub individual fan blades until clean. Avoid moving or
damaging balancing flat weight, clip is usually found on
one or more of the fan blades
Note: Core installation label on the outer end of the core.
•
vacuum and wipe
To install the clean core:
•
reassemble making sure ducting is reattached firmly
and insulation and moisture barrier are sealed and
taped
e) install the clean filters
f)
install clean core
a) first mount the bottom flange of the core guide into the
bottom H channel approximately 1/4” (6mm)
Before attempting this task, thought should be given
to having a qualified service technician complete the
service work.
b) mount the left or right side flange of the core guide
approximately 1/4” (6mm) followed by the other side
c) mount the top flange of the core guide into the top H
channel approximately 1/4” (6mm)
d) with all four corners in place and the core straight and
even, push hard in the center of the core until the core
stops on the back of the cabinet
NOTE: Core will appear to stick out from cabinet approximately 1/8” (3mm). This is designed this way so that the
access door will fit tight against the core.
4. Motors - Maintenance Free
5. Drain (condensate) Line - Clean Once a Year
Inspect drain line, drain spout and “P” trap for blockage,
mold or kinks. Flush with warm soapy water and replace if
worn, bent or unable to clean.
18