Trane GRAA Installation, Operation And Maintenance Manual
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Trane GRAA Installation, Operation And Maintenance Manual

Trane GRAA Installation, Operation And Maintenance Manual

Outdoor rooftop gas-fired duct furnace
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Installation, Operation, and Maintenance
Outdoor Rooftop Gas-Fired Duct
Furnace
Natural or Power Vented
M M o o d d e e l l s s : :
GRAA
GRDA
GRBA
GFAA
GRCA
GFBA
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning
equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person
could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that
are attached to the equipment.
August 2020
GFCA
GFDA
S S A A F F E E T T Y Y W W A A R R N N I I N N G G
M M U U A A - - S S V V X X 0 0 0 0 4 4 B B - - E E N N

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  • Page 1 Installation, Operation, and Maintenance Outdoor Rooftop Gas-Fired Duct Furnace Natural or Power Vented M M o o d d e e l l s s : : GRAA GRDA GFCA GRBA GFAA GFDA GRCA GFBA S S A A F F E E T T Y Y W W A A R R N N I I N N G G Only qualified personnel should install and service the equipment.
  • Page 2 CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs. Important Responsible Refrigerant Practices Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified.
  • Page 3 S S t t a a t t e e o o f f C C a a l l i i f f o o r r n n i i a a t t o o c c a a u u s s e e c c a a n n c c e e r r t t h h r r o o u u g g h h i i n n h h a a l l a a t t i i o o n n . . Copyright This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.

  • Page 4: Table Of Contents

    Table of Contents Receiving Instructions ............6 Pre-Installation Instructions.
  • Page 5 T T a a b b l l e e o o f f C C o o n n t t e e n n t t s s Air Filters (On Mated Air Moving Device)........32 Lighting.

  • Page 6: Receiving Instructions

    Receiving Instructions Inspect shipment immediately when received to determine if any damage has occurred to the crate during shipment. After the unit has been uncrated, check for any visible damage to the unit. Check motor position and turn blower wheel to determine if damage has occurred to these critical parts. If any damage is found, the cosignee should sign the bill of lading indicating such damage and immediately file claim for damage with transportation company.

  • Page 7: General Safety Information

    General Safety Information W W A A R R N N I I N N G G H H a a z z a a r r d d o o u u s s S S e e r r v v i i c c e e P P r r o o c c e e d d u u r r e e s s ! ! F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w a a l l l l p p r r e e c c a a u u t t i i o o n n s s i i n n t t h h i i s s m m a a n n u u a a l l a a n n d d o o n n t t h h e e t t a a g g s s , , s s t t i i c c k k e e r r s s , , a a n n d d l l a a b b e e l l s s c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y .
  • Page 8 G G e e n n e e r r a a l l S S a a f f e e t t y y I I n n f f o o r r m m a a t t i i o o n n upwards on the tracks, and push up into the top lip;...

  • Page 9: Specifications

    Specifications Figure 1. Standard Natural Vented Outdoor Duct Furnace 1" (25) 26" Typ. (660) C (Typ.) Vent Cap Is Shipped In Separate Carton 19" 1-1/8" (29) (483) Typ. Duct 39" Flange Opening (991) Connection Electrical 10-1/8" Connections (257) 5-1/16" (129) 5/8"...
  • Page 10 S S p p e e c c i i f f i i c c a a t t i i o o n n s s Figure 2. Standard Power Vented Outdoor Duct Furnace 1" (25) 26" Typ. (660) Flue Product...
  • Page 11 S S p p e e c c i i f f i i c c a a t t i i o o n n s s Table 2. Performance and Specification Data INPUT OUTPUT Temp. Rise Min. Shipping CAPACITY RATING RATING...

  • Page 12: Performance Data Curves

    Performance Data Curves Figure 3. High Temperature Rise Duct Furnace — 30–90°F (17–50°C) • Pressure drop through the heat exchanger is based on the CFM throughput. The desired data is obtained in the following manner: – Select heater size based on heat loss of the building to be heated. –...
  • Page 13 P P e e r r f f o o r r m m a a n n c c e e D D a a t t a a C C u u r r v v e e s s Figure 4.

  • Page 14: Bypass Sizing Information

    Bypass Sizing Information Built On the Job (Not Furnished by Factory) On occasion when a duct furnace is incorporated in an air handling system, it may be desirable to handle a total of more CFM than the duct furnace will pass at a given static pressure drop and temperature rise.

  • Page 15: Installation

    Installation W W A A R R N N I I N N G G H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! ! F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y .
  • Page 16 I I n n s s t t a a l l l l a a t t i i o o n n Figure 6. Minimum Clearances to Combustible Material or Obstructions Power Vent Units required 36" 18" (457) clearance above top of unit.

  • Page 17: Venting

    Venting N N o o t t e e : : All venting installations shall be in accordance with the latest edition of “Part 7, Venting of Equipment of the National Fuel Gas Code, ANSI Z223.1 (NFPA 54), or applicable provisions of local building codes”.

  • Page 18: Field Installation Instructions

    V V e e n n t t i i n n g g Field Installation Instructions 1. Remove “Side Access Panel”. 2. Insert Vent Sleeve of “Vent Cap Assembly” (Item 1) thru “Top Panel Assembly” (Item 2), and over Vent Collar of “Flue Collector Assembly” (Item 3). 3.
  • Page 19 V V e e n n t t i i n n g g Figure 10. Power Venter Discharge Location 3 MUA-SVX004B-EN...

  • Page 20: Duct Specifications

    Duct Specifications • Ductwork which is outdoors must be insulated and sealed to prevent water from entering either furnace or building through the duct. I I m m p p o o r r t t a a n n t t : : Do not alter the flange connection for the duct attachment; air may bypass and cause combustion problems.

  • Page 21: Gas Connections

    Gas Connections All gas piping should be installed in accordance with local codes. It is required that a ground union be installed adjacent to the manifold for easy servicing. On vertical runs, a drip leg should be provided upstream of the control manifold (See Figure 11, p.
  • Page 22 G G a a s s C C o o n n n n e e c c t t i i o o n n s s Figure 11. Drip Leg Installation Figure 12. Field Piping Recommendations • For the most satisfactory piping installation, the following procedure should be followed. Make piping layout of the whole installation and calculate the cubic feet of gas that each supply pipe will carry.
  • Page 23 G G a a s s C C o o n n n n e e c c t t i i o o n n s s • 250 cfh is supplied from B to D, requiring 1 inch pipe. •...
  • Page 24 G G a a s s C C o o n n n n e e c c t t i i o o n n s s N N o o t t e e s s : : •...

  • Page 25: Electrical Connections

    Electrical Connections W W A A R R N N I I N N G G H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! ! F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y .

  • Page 26: Operation

    Operation General Information • All units are equipped with intermittent pilot ignition systems. This system is 100% pilot burner shut off. See for burner/gas controls. The pilot is lit and extinguished during every cycle of operation. There is no burning standing pilot. •...
  • Page 27 O O p p e e r r a a t t i i o o n n Table 4. Gas Supply Pressure Propane Gas Natural Gas Heating Value 1075 Btu/Ft (40.1 MJ/m 2500 Btu/Ft (93.1 MJ/m Manifold Pressure Single Stage Application 3.5 inch WC (0.87 kPa) 10.0 inch WC (2.49 kPa) Two Stage Application - High Fire...

  • Page 28: Controls

    Controls • Electronic modulating gas firing is available from the factory on natural and propane gas units. • Do not use a thermostatic fan control switch when either two-stage firing or modulated gas controls are used. A fan time delay switch can be used, however, and is available as an option on outdoor duct furnaces.

  • Page 29: Gas Controls

    Gas Controls Single Stage Control Gas heating units are factory provided with an automatic single-stage gas valve. This valve is an on/off type control, typically activated by a low voltage single-stage thermostat. 1. The thermostat calls for heat. 2. The pilot valve opens. 3.
  • Page 30 G G a a s s C C o o n n t t r r o o l l s s With power applied to the unit, this system operates in the following manner: 1. The thermostat calls for heat. 2.

  • Page 31: Air Distribution

    Air Distribution Two basic air control systems are used to deliver conditioned air to the occupied space: “constant” fan operation and “intermittent” fan operation. Intermittent Fan Operation This air control system is available on duct furnaces when the fan time delay relay is ordered (optional).

  • Page 32: Air Throughput

    Air Throughput Static Pressure through the duct furnace should not exceed 2.0 inches (0.50 kPa) water column. The standard outdoor duct furnaces are operated at a temperature rise range of 20° to 60°F (11° to 33°C) rise. The furnaces are also available at a higher temperature rise range of 30° - 90°F (17° - 50°C).

  • Page 33: Lighting

    Lighting I I m m p p o o r r t t a a n n t t : : Purge the gas line of air before attempting to light the pilot in the unit. Wait 5 minutes for unburned gas to vent. Check for gas leaks. W W A A R R N N I I N N G G E E x x p p l l o o s s i i o o n n H H a a z z a a r r d d ! ! F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w s s a a f f e e l l e e a a k k t t e e s s t t p p r r o o c c e e d d u u r r e e s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y o o r r...
  • Page 34 L L i i g g h h t t i i n n g g Table 5. Main Burner Orifice Schedule* STD. TEMP. RISE HIGH TEMP. RISE FURNACE (20°-60°F) FURNACE (30°-90°F) TYPE OF GAS NATURAL PROPANE NATURAL PROPANE 1075 BTU/Ft 2500 BTU/Ft 1075 BTU/Ft 2500 BTU/Ft...

  • Page 35: Primary Air Shutter Adjustment

    Primary Air Shutter Adjustment • After the unit has been operated for at least 15 minutes, adjust the primary air flow to the burners. Turn the friction-locked, manually-rotated air shutters clockwise to close, or counterclockwise to open. • For correct air adjustment, close the air shutter until yellow tips in the flame appear. Then open the air shutter to the point just beyond the position where yellow tipping disappears.

  • Page 36: Pilot Adjustment

    Pilot Adjustment 1. With unit firing, remove the pilot adjustment cap. 2. Adjust the pilot screw to provide properly-sized flame. 3. A proper pilot flame is a soft steady flame that envelopes 3/8 to 1/2 inch (9.5 to 12.7 mm) of the flame sensor.

  • Page 37: Gas Input Adjustment

    Gas Input Adjustment When shipped from the factory, all gas fired units are equipped for the average BTU of the gas stamped on the rating plate. N N O O T T I I C C E E H H e e a a t t E E x x c c h h a a n n g g e e r r D D a a m m a a g g e e ! ! F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n h h e e a a t t e e x x c c h h a a n n g g e e r r d d a a m m a a g g e e .

  • Page 38: Start-Up

    Start-Up Before starting the rooftop gas heating unit, use the “Installation Check Sheet” (found at the end of this manual) in conjunction with the procedures outlined below to ensure that the unit is completely and properly installed and ready for start-up. 1.

  • Page 39: Maintenance

    Maintenance W W A A R R N N I I N N G G H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! ! F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g c c o o u u l l d d r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y .
  • Page 40 M M a a i i n n t t e e n n a a n n c c e e from the locating slot while retaining spring is still compressed. Pull the burners upward and out. 7. Remove any dirt, dust or other foreign matter from the burners using a wire brush and/or compressed air.
  • Page 41 M M a a i i n n t t e e n n a a n n c c e e Figure 16. Natural Vent Duct Furnace Figure 17. Power Vent Duct Furnace MUA-SVX004B-EN...

  • Page 42: Troubleshooting

    Troubleshooting Symptoms Possible Causes Corrective Actions Gas odor Shut off gas supply Inspect all gas piping and immediately. repair. Blocked heat exchanger. Clean heat exchanger. Drafts around heater. Eliminate Drafts. Refer to installation. Negative pressure in the building. See installation. Blocked draft hood/flue Clean draft hood/flue collector.
  • Page 43 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g Symptoms Possible Causes Corrective Actions Main burners will not light Main gas off.
  • Page 44 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g Symptoms Possible Causes Corrective Actions Floating flame Blocked heat exchanger. Clean heat exchanger.
  • Page 45 T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g Symptoms Possible Causes Corrective Actions *Power venter motor will not start Lack of power at unit.

  • Page 46: Gas Equipment Start-Up

    Gas Equipment Start-Up Customer ____________________________________ Job Name & Number _________________________ PRE-INSPECTION INFORMATION With power and gas off. Type of Equip: Unit Heater Duct Furnace Indoor Rooftop Serial Number _________________________ Model Number __________________________ Name Plate Voltage: _____________ Name Plate Amperage: _____________ Type of Gas: Natural Tank Capacity...
  • Page 47 N N o o t t e e s s MUA-SVX004B-EN...
  • Page 48 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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