Sterling outdoor rooftop gas-fired duct furnace Installation And Service Manual

Natural or power vented

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OUTDOOR ROOFTOP GAS-FIRED DUCT FURNACE
ATTENTION:
READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY
BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA
PLATE FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE
AGREE WITH THOSE AT POINT OF INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s)
IN THE SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.
Model No.
The use and storage of gasoline or other flammable vapors and liquids in open
containers in the vicinity of this appliance is hazardous.
Improper installation, adjustment, alteration, service or maintenance can
cause property damage, injury or death. Read the installation, operating and
maintenance instructions thoroughly before installing or servicing this equipment.
Install, operate and maintain unit in accordance with manufacturer's
instructions to avoid exposure to fuel substances or substances from incomplete
combustion which can cause death or serious illness. The state of California has
determined that these substances may cause cancer, birth defects, or other
reproductive harm.
Installer Please Note: This equipment has been test fired and inspected. It has been shipped
free from defects from our factory. However, during shipment and installation, problems such as
loose wires, leaks or loose fasteners may occur. It is the installer's responsibility to inspect
and correct any problems that may be found.
These units are certified by CSA International for operation on either natural or propane gas.
Read this manual and all labels attached to the unit carefully before attempting to install, operate or
Outdoor Rooftop Duct Furnaces: QV(RT/PV)- (100, 150, 200, 250, 300, 350, 400) (H)(M)
*L
ook in the direction of the unit air flow to determine whether the unit is right or left-hand accessible.
INSTALLATION AND SERVICE MANUAL
(NATURAL OR POWER VENTED)
SAVE THIS MANUAL
FOR YOUR SAFETY
FOR YOUR SAFETY
If you smell gas:
1. Don't touch electrical switches.
2. Extinguish any open flame.
3. Immediately call your gas supplier.
INSTALLER'S RESPONSIBILITY
service the following unit models:*
(RT = Natural Vent; PV = Power Vent)
Serial No.
HVAC PRODUCTS
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: (413) 564-5540
http://www.mestek.com
(S) RISM-9
J30-05380A
FAX: (413) 562-5311

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  • Page 1 INSTALLATION AND SERVICE MANUAL (S) RISM-9 J30-05380A OUTDOOR ROOFTOP GAS-FIRED DUCT FURNACE (NATURAL OR POWER VENTED) ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT POINT OF INSTALLATION.
  • Page 2: Table Of Contents

    TABLE OF CONTENTS tracks, and push up into the top lip; swing and lower the panel in place until it engages with the bottom panel. RECEIVING/PRE-INSTALLATION Turn the screwhead on each latch clockwise. The screw INSTRUCTIONS ............ 2 GENERAL SAFETY INFORMATION ....2, 3 must turn freely one quarter turn before resistance is felt SPECIFICATIONS in order for the lock to engage.
  • Page 3: General Safety Information

    GENERAL SAFETY INFORMATION Roofcurb kits for rooftop gas heating units are shipped vent through a protective grille, and the design of the knocked down. A curb kit contains (insulated) curb vent cap is such that the products of combustion are rails, hardware, sealant, self-adhering rubber discharged at the upper section of the cap.
  • Page 4: 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 5 Chart 2 - Performance and Specification Data Nat. L.P. INPUT OUTPUT Temp. Rise Min. Shipping CAPACITY RATING RATING EFF. MIN. MAX. F Deg. Static Clearance Inlet Inlet Weight Weight BTU/Hr BTU/Hr (C Deg.) in. of Water (kW) (kW) (cu. m/s) (cu.
  • Page 6: Performance Data Curves

    PERFORMANCE DATA CURVES Figure 3 - High Temperature Rise Duct Furnaces — 30-90 F° (17-50 C°) 4. Follow vertical line down to select CFM. Pressure drop through the heat exchanger is based on the CFM throughput. The desired data is obtained in 5.
  • Page 7 BYPASS SIZING INFORMATION (BUILT ON THE JOB – NOT FURNISHED BY USE OF BYPASS CURVES FACTORY) The width of the by-pass for CFM in excess of that On occassion when a duct furnace is incorporated in provided through the heater may be found in the an air handling system, it may be desirable to handle a following manner: total of more CFM than the duct furnace will pass at a...
  • Page 8: Installation

    INSTALLATION Ducts connected to duct furnaces shall have removable Open all disconnect switches and access panels on both upstream and downstream sides secure in that position before installing unit. of the unit. These openings shall be accessible when the Failure to do so may result in personal injury or unit is installed in service, and shall be of such size that death from electrical shock.
  • Page 9: Venting

    VENTING All venting installations shall be in accordance with the Power vented models are designed with combustion latest edition of “Part 7, Venting of Equipment of the air inlet and flue products outlet located in the louvered National Fuel Gas Code, ANSI Z223.1-1999, or side access panel.
  • Page 10: Gas Connections

    DUCT SPECIFICATIONS Ductwork which is outdoors must be insulated and Ductwork connected to duct furnaces should have sealed to prevent water from entering either furnace or removable access panels on both the upstream and building through the duct. Do not alter the flange downstream sides of the unit.
  • Page 11 GAS CONNECTIONS (continued) NOTICE: If more than one gas duct furnace is to be For the most satisfactory piping installation, the following served by the same piping arrangement, the total procedure should be followed. Make piping layout of the cu. ft./hr. input and length of pipe must be whole installation and calculate the cubic feet of gas that considered.
  • Page 12: Electrical Connections

    Chart 3 GAS PIPE SIZE Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig (3.5 kPa) or Less, and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa) (Based on a 0.60 Specific Gravity Gas) Nominal Iron Internal...
  • Page 13: Operation

    OPERATION NOTICE: Check gas supply pressure (see chart 4). GENERAL All units are equipped with intermittent pilot ignition Gas valves are suitable to a maximum pressure of 0.5 psi (14 inches water column). If the main gas systems. This system is 100% pilot burner shut off. See Figure 11 for burner/gas controls.
  • Page 14: Gas Controls

    OPERATION continued Chart 4 - Gas Supply Pressure Natural Gas Propane Gas Heating Value 1075 Btu/Ft 2500 Btu/Ft (40.1 MJ/m (93.1 MJ/m Manifold Pressure 3.5 in. W.C. 10.0 in. W.C. (0.87 kPa) (2.49 kPa) Minimum Supply Pressure Single Stage Application 5.0 in.
  • Page 15 GAS CONTROLS continued TWO-STAGE CONTROL The unit is also provided with an automatic electric valve Optional two-stage control is provided with a two-stage in series with the hydraulic modulating valve, which gas valve capable of firing at 100% and 40% of rated typically cycles the unit in response to a low voltage input.
  • Page 16 GAS CONTROLS continued ELECTRONIC MODULATING CONTROL With power applied to the unit, this system operates in the following manner: Units with electronic modulating control are provided 1. The thermostat calls for heat. with an electronic modulating valve capable of firing from 100 percent to 40 percent of rated input.
  • Page 17: Air Distribution/Throughput

    AIR DISTRIBUTION Two basic air control systems are used to deliver CONSTANT FAN OPERATION conditioned air to the occupied space: “constant” fan Duct Furnaces: This air control system is standard on operation and “intermittent” fan operation. duct furnaces without a fan time delay relay. The blower operates constantly, circulating air through the unit, INTERMITTENT FAN OPERATION through the discharge, continuously into the occupied...
  • Page 18: Primary Air Shutter/Pilot Adjustment

    LIGHTING continued 2. Turn on electrical power. The unit should now be Chart 5 - Main Burner Orifice Schedule* under the control of the thermostat. TYPE OF GAS NATURAL PROPANE 3. Turn the thermostat to the high heat reading to see HEATING VALUE 1075 BTU/Ft 2500 BTU/Ft...
  • Page 19: Gas Input Adjustment

    GAS INPUT ADJUSTMENT 250,000 BTU/hr. When shipped from the factory, all gas fired units are INPUT= equipped for the average BTU of the gas stamped on 1000 BTU/cu. ft. x 60 min/hr the rating plate. = 41.7 cu ft. per min. Since the BTU content of gases varies Before checking the unit input, all other gas in many localities, the input must be checked after...
  • Page 20: Maintenance

    START-UP (continued) 2. Disable air handling blower. Fire unit and confirm FINAL CHECKOUT that high limit switch shuts gas off within Run the unit sequentially through its stages of heating. approximately 5 minutes. Re-enable air handling One proper unit operation is verified, perform these final steps: blower.
  • Page 21 Figure 13 - Natural Vent Duct Furance Figure 14 - Power Vent Duct Furnace – 21 –...
  • Page 22 Chart 6 - Trouble Shooting SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTIONS A. Gas odor. 1. Shut off gas supply immedi- 1. Inspect all gas piping and ately. repair. 2. Blocked heat exchanger. 2. Clean heat exchanger. 3. Drafts around heater. 3. Eliminate Drafts. Refer to installation.
  • Page 23 Chart 6 - Trouble Shooting continued SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTION 8. Be sure 115 volts is supplied 8. Defective transformer. to the transformer primary then check for 24 volts at secondary terminal before replacing. 9. Loose wiring. 9. Check and tighten all wiring connections.
  • Page 24 Chart 6 - Trouble Shooting continued SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTION J. Floating flame. 1. Blocked heat exchanger. 1. Clean heat exchanger. 2. Insufficient combustion air. 2. Clean combustion air inlet openings in bottom panel. Refer to installation. 3. Blocked venting. 3.
  • Page 25 Chart 6 - Trouble Shooting continued SYMPTOMS CORRECTIVE ACTION POSSIBLE CAUSES N. Too much heat. 1. Replace thermostat. 1. Thermostat malfunction. 2. Heater runs continuously. a. Improper thermostat or a. Check wiring per diagrams. transformer wiring at gas valve. b. Check operation at valve. Look for short and correct b.
  • Page 26: Warranty

    How to order Replacement Parts Please provide the following information to your local representative: • Models Number • Serial Number (if any) • Part Description and Number as shown in Replacement Parts Literature If further assistance is needed, please contact the manufacturer's customer service department. SERVICE NOTE organization incur a problem, the nature of which is not Due to the many configurations, options and voltage...
  • Page 27 GAS EQUIPMENT START-UP Customer ____________________________________ Job Name & Number _________________________ PRE-INSPECTION INFORMATION With power and gas off. Type of Equip: Rooftop Serial Number _________________________ Model Number __________________________ Name Plate Voltage: _____________ Name Plate Amperage: _____________ Type of Gas: Natural Tank Capacity _______ lbs. Rating: ______ BTU @ ____ F°...
  • Page 28 HVAC PRODUCTS 260 NORTH ELM ST., WESTFIELD, MA 01085 TEL: (413) 564-5540 FAX: (413) 562-5311 http://www.mestek.com...

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