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©2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause property damage,
personal injury or loss of life.
Installation and service must be performed by a li-
censed professional HVAC installer, service agency
or the gas supplier.
Failure to follow safety warnings and these instruc-
tions exactly could result in property damage, dan-
gerous operation, serious injury, or death.
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the ap-
plication needs must be made by a licensed profes-
sional HVAC installer (or equivalent) using factory-
specifi ed parts.
Do not use this system if any part has been under
water. A fl ood-damaged appliance is extremely dan-
gerous. Immediately call a licensed professional
HVAC service technician (or equivalent) to inspect
the system and to replace all controls and electrical
parts that have been wet, or to replace the system, if
deemed necessary.
The State of California has determined that this
product may contain or produce a chemical or
chemicals, in very low doses, which may cause
serious illness or death. It may also cause cancer,
birth defects, or reproductive harm.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
NOTE - VOSA054 and VOSA072 units have special
wiring and piping considerations, see page 17.
INSTALLATION
INSTRUCTION
VOSA Outdoor Air Units
VRF SYSTEMS -- Indoor Units
507447-01
03/2017
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFC's and HCFC's) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for non-compliance.
General
The VOSA dedicated outdoor air concealed ducted
indoor units are matched with an outdoor heat pump
unit (excluding Mini-VRF) to create a VRF (variable
refrigerant fl ow) system that uses HFC-410A refrigerant.
Refer to the Product Specifi cation bulletin (EHB) for
the proper use of these indoor units with specifi c heat
pumps, heat recovery units, mode switching devices,
branch pipes, line sets and controls.
Shipping and Packing List
Check the components for shipping damage. If you fi nd
any damage, immediately contact the last carrier.
Package 1 of 1 contains the following:
1 - Assembled dedicated outdoor air concealed ducted
unit
Refrigerant piping insulation sleeves
2 - VOSA036 and VOSA048
4 - VOSA054 and VOSA072
1 - Flexible condensate connector (VOSA036-048)
1 - Hose clamp (VOSA036-048)
1 - Condensate connection pipe (VOSA054-072)
1 - Roll tape for condensate pipe (VOSA054-072)
1 - Branch pipe kit (VOSA054-096)
Flare Nuts
1 - VOSA036-048
2 - VOSA054-096
2 - Connector for electronic expansion valves and liquid
lines (VOSA054-072)
1 - Resistor
1 - Installation manual
1
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Related Manuals for Lennox VOSA036S4
Summary of Contents for Lennox VOSA036S4
- Page 1 INSTALLATION INSTRUCTION ©2017 Lennox Industries Inc. Dallas, Texas, USA VOSA Outdoor Air Units VRF SYSTEMS -- Indoor Units 507447-01 03/2017 IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s and HCFC’s) as of July 1, 1992.
- Page 2 The LVSS piping report is an engineered design that must be followed. The piping diagram or diagrams included within the LVSS report have been prepared based on the information provided to the Lennox VRF applications department. When the indicated lengths change from the fi gures...
-
Page 3: Unit Dimensions - Inches (Mm)
Unit Dimensions - Inches (mm) VOSA036S4, VOSA048S4 13-3/8 (339) (Duct Opening) 3-1/4 3-1/4 (83) (83) 1-1/4 (38) 42-1/4 (1073) (Duct Opening) 2-1/2 RETURN AIR VIEW (65) RETURN AIR HOLES FOR SUSPENDING (4) RETURN DUCT FLANGE 45-1/4 (1149) 3-1/2 (89) LIQUID... -
Page 4: Left Side View
VOSA036S4, VOSA048S4 27-1/4 PIPE LIQUID (692) PIPE (51) 9-7/8 (251) 13-3/8 ELECTRICAL (Supply (339) CONTROL 16-1/2 Air Duct ELECTRONIC (Return (419) Opening) EXPANSION Air Duct VALVE Opening) 1-3/8 1-5/8 (35) (41) 1/2 (11) 1-5/8 (41) AUXILIARY DRAIN 4-7/8 (124) 7-3/8 (187) - Page 5 Unit Dimensions - Inches (mm) VOSA054S4, VOSA072S4 13-1/2 (343) (Duct Opening) 3-7/8 (98) 2-3/8 (60) 44-1/8 (1121) (Duct Opening) (76) RETURN AIR VIEW HOLES FOR RETURN SUSPENDING (4) RETURN AIR DUCT FLANGE PIPES (2) 50-1/4 (1276) 2-1/4 (57) 2-5/8 (67) LIQUID PIPES (2) (813)
-
Page 6: Front View
Clearances Refer to fi gure 1 for minimum clearance requirements. Wall 20” (508 mm) Minimum Service Clearance Flow Minimum 24” (610 mm) Service Wall Clearance 24” (610 mm) Minimum Service Clearance TOP VIEW Ceiling 1” (25 mm) Minimum Clearance 1” (25 mm) Minimum Clearance Suspended Ceiling FRONT VIEW... -
Page 7: Unit Placement
Unit Placement WARNING AVOID Do not install the unit in the following locations: Use the provided and specifi ed components when • Areas exposed to petrochemicals or petrochemical installing equipment. Failure to do so may result products in unit falling, water leaking or electrical shocks, •... -
Page 8: Installation
NOTE - Threaded rod (requirement correct height. Remove the electrical tape holding the of Lennox warranty program) is the ONLY acceptable upper washers and nuts in place and tighten each method of suspending the unit; do not use chains or of the four nuts above the brackets down onto the straps. -
Page 9: Refrigerant Piping Connections
5. Apply recommended HFC-410A refrigerant lubricant Refrigerant Piping Connections to the outside of the fi eld-provided fl ared line sets (fi gure 5 -- A). WARNING 6. Align the union tube and fl ared refrigerant lines with Refrigerant leaks are unlikely; however, if a each other, then tighten the fl... - Page 10 8. Flared connections should always be accessible and Incoming must be insulated to prevent condensation. See fi gure liquid line connection Table 2. Flare Nut Torque Recommendations Incoming Outside Recommended No torque wrench suction line Diameter Torque available connection Finger tighten and use an appropriately sized wrench to turn an additional:...
- Page 11 3. See fi gure 11 for applications including a single unit Condensate Piping Connections and a single drain. In this case, ensure that the drain line is properly sloped (no less than 1/4 inch per foot) CAUTION and condensate lines are routed to ensure moisture is Make sure that drain piping is properly routed and drained away from the indoor unit.
- Page 12 In the U.S.A., wiring must conform with current local codes Wiring Connections and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the WARNING current Canadian Electrical Code (CEC). Isolate the power supply before accessing unit electrical Refer to unit nameplate for minimum circuit ampacity and terminals.
- Page 13 Tightening torque for the terminal screws Table 3. Terminal Screw Tightening Torque • Use the correct screwdriver for fi ghting the terminal Tightening torque (lb-ft) screws. If the screwdriver blade is too small, the head Terminal base of 0.58-0.72 of the screw might be damaged, and the screw will not remote controller/Signal be properly tightened.
- Page 14 Outdoor unit Outdoor unit Outdoor unit (main unit) (sub1 unit) (sub2 unit) (H1 H2 E) (H1 H2 E) (H1 H2 E) (PQE) Ground cable shield DO NOT connect to E (PQE) Install a terminating resistor at the last indoor unit terminals P and Q of the daisy chain.
- Page 15 Temp sensor T2B error betw een indoor and Water level alarm displayed "E E" displayed or "E1" displayed outdoor unit Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring. Figure 15. VOSA036S4-1 and VOSA048S4-1 Typical Wiring Diagram...
- Page 16 TA (B) TO CCM TA (A) COMM. BUS TO CCM COMM. BUS BLACK BLACK BLACK COMPONENT FM1(FM2) INDOOR FAN BLUE ELECTRONIC EXPANSION VALVE TA(A),TA(B) OUTLET AIR TEMP. T0(A),T0(B) INLET AIR TEMP. EVAP OUTLET TEMP T2B(A),T2B(B) IN COOLING MODE T2(A),T2(B) COIL TEMP. XP0-9 PLUG GROUND...
- Page 17 VOSA054 and 072 Piping and Wiring Connections VOSA054 and 072 units have two control boards in the The additional boards and piping connections require control box and have two gas pipes, two liquid pipes, two special considerations when connecting the piping and branch pipes and two electronic expansion valves (EXV).
- Page 18 Communication (PQE) Wiring NOTE - Control board A is the bottom control board and Control board B is the top control board in the electronic control box. Terminal Block A Terminal Block B Figure 30. VOSA054 and 072 Terminal Block Control Board B - Top Control Board A - Bottom Figure 29.
- Page 19 Connect the incoming PQE wiring to the terminal block for Connecting V0STAT51 Control board A. Connect the V0STAT51 cable to the cable attached to If this is the last indoor unit in the system, no additional Control board A. PQE wiring is needed. Add a resistor between P and Q on Control board B.
- Page 20 • Piping between branch pipe and indoor unit: liquid line Refrigerant Piping = 3/8” and gas line = 5/8“. • Use the provided branch pipe kit to connect both sets of refrigerant line connections. • Consult LVSS piping report diagram for all other piping sizes.