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SDRIOM-2
PN# 94.2000.03
P
HVAC PRODUCTS
4830 TRANSPORT DRIVE, DALLAS,TX 75247
PHONE: 214-638-6010 FAX: 214-905-0806 www.sterlinghvac.com
INSTALLATION, OPERATION AND MAINTENANCE MANUAL FOR
SDR MODEL DIRECT GAS-FIRED HEATERS
ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY
BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS UNIT! CHECK UNIT RATING
PLATE FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE
AGREE WITH THOSE AT POINT OF INSTALLATION
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SECTION I - FORWARD I.As is the case with any fine piece of equipment, care must Table Of Contents be taken to provide the proper attention to the operation Section I: Forward and Table of Contents........................ 2 and maintenance details of this machine. Section II: General Information........................................... 2 Section III: Installation............................................................ 3 This manual of instructions has been prepared in order for Section IV:
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SECTION III - INSTALLATION This equipment must be installed and wired in accordance Recirculation of room air is not permitted. All air must be with regulations of the National Board of Fire Under- ducted from the outdoors. writers, National Electrical Code, and local governing bodies. The following recommendations are not intended to If in doubt regarding the application of this appliance, supplant any requirements of federal, state, or local codes consult the factory. having jurisdiction. Auth
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D. Electrical Connections DANGER: Never use an open flame to detect gas leaks. Explosive conditions may exist which WARNING: Open all disconnect switches and would result in personal injury or death. secure in that position before wiring unit. Failure to do so may result in personal injury or death from electrical shock. WARNING: To avoid equipment damage or possible personal injury, do not connect gas piping to this unit until a supply line pressure/leak test WARNING: Controls must be protect
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SECTION IV - PRE START-UP A. Pre Start-Up 6. Check set screws on all bearings, pulleys and fans for All equipment has been factory tested, adjusted, metered tightness. and inspected to meet conditions set at the time the order 7. Check voltage supplied to disconnect switch. The was placed. Only minimal adjustments should be required. maximum voltage variation should not exceed ±10%. All information in this service manual is typical. All products Phase voltage unbalance must not exceed 2%. are s
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SECTION V - UNIT START-UP Close or replace all doors and service panels. Unit will run for 5 seconds before ignition trial. Turn main disconnect switch off. Verify the incoming line NOTE: 3 OR 4 TRIALS MAY BE NEEDED TO voltage matches the unit nameplate rating. If the voltage is PURGE AIR FROM GAS LINE. over ±10% of nameplate rating or phase voltage unbalance is over 2%, notify the contractor or power company. United Technologies Electronic Controls Spark Ignitor Watch microammeter carefully. Th
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C. Gas Pressure Switches - Operate unit in Heat mode. When checking operation of air pressure switches on The low pressure switch will trip out and must be reset systems without pilot the heat switch will have to be before resuming operation when the inlet gas valve is turned off approximately five seconds to reset the igni- turned off during operation.The high pressure switch tion control. may be checked out by reducing the setting of its trip point below unit operating pressure. It should th
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SECTION VII – TROUBLESHOOTING System without Pilot Symptom Cause Remedy A. If blower does not operate. 1. Low or no voltage. 1. Check power source. 2. Fuse(s) blown. 2. Check and replace. 3. Customer interlock not closed 3. Close or connect customer or connected. interlock. 4. Fan Off-On switch in Off position. 4. Switch to On position. 5. Time clock, night setback thermo- 5. Check time clock, night setback stat or field installed controls thermostat and field installed open. controls for prop
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SECTION VII – TROUBLESHOOTING System without Pilot continued Symptom Cause Remedy C. continued 9. Defective gas valve or actuator. 9. Check power to gas valves. If gas pressure matches unit rating plate and valve does not open, replace gas valve or actuator. 10. Defective spark rod or out of 10. Make sure spark rod is producing position. (see spark rod diagram a sufficient spark to light off #P-001004) burner, make sure porcelain is not cracked. Check wiring or replace if necessary. 11. Flame
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SECTION VII – TROUBLESHOOTING P-001004 P-001003 10
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United T echnologies Electronics Controls all outputs and enters lockout. Reset is accomplished by Operation of the Series 1016-400 Direct Spark cycling the power off for a minimum of 5 seconds. Ignition Control If flame is lost once it has been established, the control will On a call for heat a five second pre-purge is initiated. shut off the gas valve within 0.8 seconds and locks out. Upon completion of the pre-purge, the gas valve and 60 Hz spark are energized. When flame is detected, the con
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TROUBLESHOOTING GUIDE Series 14 Discharge Temperature Control continued Reproduced with permission from Maxitrol® Company Symptom Possible Cause Field T est Remedy E. Continuous High 1. Short circuit in TD114 1. Inspect for shorts at or 1. Correct wiring if shorts exist. Fire (Electronics Remote Temperature between Amplifier terminals Problem). Selector circuit or wiring. 1 & 2 or TD114 terminals 1 & 3. 2. Open circuit in 2. Check TS114/TS1007 for 2. If modulating voltages are TS114/TS1007 open
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TROUBLESHOOTING GUIDE Series 14 Discharge Temperature Control continued Reproduced with permission from Maxitrol® Company Symptom Possible Cause Field T est Remedy H. continued 4. Faulty Amplifier or 4. With test resistor 4. If erratic or unstable D.C. erratic voltage supply. connected (per item H2) voltages are obtained and TD114 locally throughout the modulating connected (per item H3) range, the amplifier may be turn TD114 selector dial assumed faulty. Replace. If through entire modulating er
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TROUBLESHOOTING GUIDE Series 44 Room Temperature Control Reproduced with permission from Maxitrol® Company Field T est Remedy Symptom Possible Cause A. No Gas Flow. 1. Valve improperly 1. Arrow on side of valve 1. Install properly. installed. should point in direction of gas flow. B. Continuous Low 1. Open circuit in 1. Remove wires connected 1. If proper resistance values Fire (Electronics modulator coil. to amplifier terminals 6 &7 are not observed, replace OK). and measure resistance. mo
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TROUBLESHOOTING GUIDE Series 44 Room Temperature Control continued Reproduced with permission from Maxitrol® Company Field T est Remedy Symptom Possible Cause E. continued 3. Incorrect space 3. Follow procedures outlined 3. If proper action is obtained, temperature calibration. in “Preliminary Circuit first check item E2. Analysis” in Section IX. Recalibrate if necessary. F. Incorrect 1. Improper TS144 1. Compare sensed 1. Move TS144 to location Maximum or location. temperature reading at where
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TROUBLESHOOTING GUIDE Series 44 Room Temperature Control continued Reproduced with permission from Maxitrol® Company L. Incorrect Space 1. Incorrect maximum 1. Check to see if heater is 1. If desired temperature is Temperature discharge air delivering air at maximum not reached, increase temperature setting discharge air setting. maximum discharge air (A1044). temperature setting. 2. Incorrect minimum 2. Check to see if heater is 2. If desired space temperature discharge air delivering air at mi
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1. Turn off gas supply. 5. After the module locks out, open the manual gas cock 2. Set thermostat or controller above room temperature and make sure no gas is flowing to the pilot or main to call for heat. burner. With modules that continue to spark until the pilot 3. Watch for ignition spark or for glow at hot surface lights or the system shuts down manually, the pilot should igniter either immediately or following prepurge. See IP light when the manual gas control knob is opened. module specif
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B. Lubrication Instructions A slight showing of grease at the seals with accompanying normal bearing temperature indicates proper lubrication. Item Manufacturer Bearing Type Normal temperature can range from “cool” to “hot to the touch” depending on size, speed and surrounding All 3 phase fan U.S., Baldor or Single row ball conditions. Excessive bearing temperature indicates faulty motors (1 HP to equal bearings lubrication. An insufficient amount of grease is suggested 20 HP) ODP,TEFC
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D. Belt T ension and Adjustment B Section Belt Pounds Pounds Belt tension is adjusted during the initial run-in and test small Manufacturer & Force for Force for periods at the factory. However, the belts are run as slack pulley Type Belt Normal 11/2 times as possible to prevent excessive damage to the bearings, diameter Tension Normal yet tight enough to prevent slippage. range in Tension inches It is necessary, therefore, to check belt tension during the 3.4-4.2 Gates Hi-Power 4.4 6.6 first fe
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c. Put system back into operation and view burner 3. Replace all access panels, which have been removed, while cycling through full firing range. This will give and operate the unit for a test period. Check for a visual check for blocked burner ports. Clean normal response and function of all controls. burner ports as necessary using a #47 drill. Burner plates should be cleaned with a wire brush at least 4. Check all gas piping for possible leaks using a soap once a year. bubble solution. 2. Ins
