Table of Contents
Advertisement
MC Series Gas-Fired
Circulating Heater
INSTALLATION
START-UP
MAINTENANCE
PARTS
Models
MC50 / MC80
MC99 / MC120
When installing models manufactured after July 7, 2008, you will notice additional selections on the control installer menu that will not
apply to this unit. DO NOT CHANGE THESE FACTORY SETTINGS. Refer to the Control Program Reference Chart within this manual
for selections that apply to this model.
This manual must be used by a qualified installer/service technician. Read all instructions in this manual before installing. Perform steps
in the given order. Failure to comply could result in substantial property damage, severe personal injury, or death.
NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors
in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
120 Braley Rd. P.O. Box 429
East Freetown, MA 02717-0429
www.htproducts.com
LP-171 Rev. 3.3.15
Advertisement
Table of Contents
Related Manuals for HTP MC50
Summary of Contents for HTP MC50
- Page 1 Failure to comply could result in substantial property damage, severe personal injury, or death. NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature.
- Page 2 IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT, CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE. DO NOT STORE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER HEATER. WHAT TO DO IF YOU SMELL GAS ...
- Page 3 In some circumstances, the property owner or his/her agent assumes the role, and at government installations, the commanding officer or departmental official may be the AHJ. NOTE: HTP, Inc. reserves the right to modify product technical specifications and components without prior notice. FOR THE INSTALLER This manual must only be used by a qualified heating installer/service technician.
-
Page 4: Table Of Contents
The latest version of the National Electrical Code, NFPA No. 70. NOTE: The gas manifold and controls met safe lighting and other performance criteria when undergoing tests specified in ANSI Z21.10.3 – latest edition. The hydronic supply and return connections of these products are for installation in closed loop systems ONLY! Use of this product in any manner other than described in this manual may result in premature product failure, substantial property damage, severe personal injury, or death. - Page 5 F. CIRCULATORS..................................17 G. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE HEATERS ............ 18 H. CIRCULATOR SIZING ................................18 I. ZONING WITH ZONE VALVES..............................19 J. ZONING WITH CIRCULATORS ..............................19 K. MULTIPLE HEATERS ................................19 L. FILL AND PURGE HEATING SYSTEM ............................ 20 M.
-
Page 6: Part 1 - General Safety Information
HEATER START-UP REPORT ..............................74 MAINTENANCE REPORT ................................. 74 MAINTENANCE NOTES ......................................78 HTP CUSTOMER INSTALLATION RECORD FORM ............................. 79 PART 1 – GENERAL SAFETY INFORMATION A. PRECAUTIONS This heater is for indoor installations only. Clearance to combustible materials: 0” top, bottom, sides and back. Front must have room for service, 24”... -
Page 7: Improper Combustion
When the heater is used to supply potable water, do not connect it to any heating system or component(s) previously used with a non-potable water-heating heater. NOTE: Damages resulting from incorrect installation or from use of products not approved by HTP, Inc. ARE NOT covered by warranty. F. WATER CHEMISTRY* ... -
Page 8: Winterizing
Water pH between 6.0 and 8.0 Maintain water pH between 6.0 and 8.0. Check with litmus paper or have it chemically analyzed by water treatment company. If the pH differs from above, consult local water treatment company for treatment needed. ... - Page 9 HTP.) In addition, local authorities may require a condensate neutralizer to neutralize the condensate. Condensate neutralizers are made up of lime crystals, marble or phosphate chips. Neutralizers can be installed in the field by the installer and purchased from HTP (p/n N1100).
-
Page 10: Optional Equipment
C. OPTIONAL EQUIPMENT Below is a list of optional equipment available from HTP. These additional options may be purchased through your HTP distributor: Indirect Tank Sensor (Part # 7250P-325) Outdoor sensor (Part # 7250P-319) 2” Stainless Steel Outside Termination Vent Kit (V500) ... -
Page 11: Leveling
Failure to keep heater area clear and free of combustible materials, liquids, and vapors can result in substantial property damage, severe personal injury, or death. 4. Gas control system components must be protected from dripping water during operation and service. 5. -
Page 12: Clearances For Service Access
C. CLEARANCES FOR SERVICE ACCESS See Figure 2 for recommended service clearances. If you do not provide the minimum clearances shown, it may not be possible to service the heater without removing it from the space. Figure 2 – Required Clearances Space must be provided with combustion/ventilation air openings correctly sized for all other appliances located in the same space as the heater. -
Page 13: Prevent Combustion Air Contamination
Failure to vent the appliance properly will result in serious personal injury or death. Vents must be properly supported. Appliance exhaust and intake connections are not designed to carry heavy weight. Vent support brackets must be within 1’ of the appliance and the balance at 4’ intervals. Appliance must be readily accessible for visual inspection for the first 3’... -
Page 14: Part 4 - Prepare Heater
Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe personal injury or death. When removing an existing heater, follow the steps below with each appliance remaining connected to the common venting system in operation, while other appliances remaining connected to common venting system are not operating. -
Page 15: Wall Mounting Instructions
Plumbing of this product should only be done by a qualified, licensed plumber in accordance with all local plumbing codes. The heater may be connected to a storage tank to supply domestic hot water. HTP offers 60/80/119/175 gallon size storage tanks in either stainless steel or glass-lined construction. -
Page 16: Relief Valve
1. The water supply should be shut off while connecting the heater. A manual control valve must be placed on the inlet connection to the heater. Unions can be used on both the hot and cold water lines for future servicing and disconnection of the unit. 2. -
Page 17: Separate Low Water Cutoff
All piping methods shown in this manual use primary/secondary connection to the heater loop. This is to avoid the possibility of noise or actuator problems in zone valves because of the high-head heater circulator. For other piping methods, consult your local HTP representative or refer to separate piping details in this manual. -
Page 18: Hydronic Piping With Circulators, Zone Valves, And Multiple Heaters
SIZING SPACE HEAT SYSTEM PIPING 1. See Piping Details in this section. In all diagrams, the space heating system is isolated from the heating loop by the primary/secondary connection. 2. Size the piping and components in the space heating system using recognized design methods. G. -
Page 19: Zoning With Zone Valves
The chart below represents various system temperatures and their respective flows and friction loss through the heater, which will aid circulator selection. Figure 4 – Pressure Drop Graph and Temperature Rise Chart – LP-171-F NOTE: The recommended circulators are based on 1 gpm per 10,000 btu/hr with 20∆t. -
Page 20: Fill And Purge Heating System
L. FILL AND PURGE HEATING SYSTEM Attach the hose to balance and purge hose connector or drain valve and run hose to nearest drain. Close the other side of the balance and purge valve or the shut off valve after the drain. ... -
Page 21: Piping Details
M. PIPING DETAILS Figure 5 LP-171 Rev. 3.3.15... - Page 22 Figure 6 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 23 Figure 7 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 24 Figure 8 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 25 Figure 9 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 26 Figure 10 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 27 Figure 11 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
-
Page 28: Part 6 - Piping With Optional Vision 1 System
PART 6 – PIPING WITH OPTIONAL VISION 1 SYSTEM (DHW PRIORITY WITH OUTDOOR RESET) A. VISION 1 SYSTEM PIPING It is important that the system piping is done correctly when using the Vision 1 System. Follow the piping diagrams 2A through 3G when piping your heater. -
Page 29: Piping Details With The Vision 1 System
D. PIPING DETAILS WITH THE VISION 1 SYSTEM Figure 12 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. - Page 30 Figure 13 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 31 Figure 14 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 32 Figure 15 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 33 Figure 16 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 34 Figure 17 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 35 Figure 18 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 36 Figure 19 – NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 37 Figure 20 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
- Page 38 Figure 21 NOTES: 1. This drawing is meant to demonstrate system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
-
Page 39: Part 7 - Venting, Combustion Air, And Condensate Removal
PART 7 – VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL The heater must be vented as detailed in this Venting Section. Ensure exhaust vent and intake piping complies with these instructions regarding vent system. Inspect finished exhaust vent and intake piping thoroughly to ensure all joints are well secured, airtight, and comply with all applicable code requirements, as well as with the instructions provided in this manual. -
Page 40: Approved Materials For Exhaust Vent And Intake Pipe
When installing AL29-4C vent piping, install a PVC-to-stainless adapter at the heater vent connection, and at the termination when using an HTP PVC termination kit. DO NOT mix AL-29-4C piping from different manufacturers unless using adapters specifically designed for the purpose by the manufacturer. -
Page 41: Exhaust Vent And Intake Pipe Location
D. EXHAUST VENT AND INTAKE PIPE LOCATION – ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1 for Canada – Exit Terminals for Direct-Vent Venting Systems Figure 22 DETERMINE EXHAUST VENT AND INTAKE PIPE LOCATION – FIGURE 22 NOTES: A. - Page 42 (kit p/n 554200 available from HTP). If the heater condensate outlet is lower than the drain, you must use a condensate removal pump.
- Page 43 Figure 23 – Condensate Details NOTES: 1. Condensate line must be pitched at least 1/4" per foot to properly drain. If this cannot be done, or a very long length of condensate hose is used, you must increase the condensate line to a minimum of 1” ID and place a tee in the line after the condensate neutralizer to properly reduce vacuum lock in the drain line.
-
Page 44: Rotating The Flue Adapter
Figure 24 – Piping Exhaust around Obstructions – Suggested Condensate Removal E. ROTATING THE FLUE ADAPTER The flue adapter on the top of the heater can be rotated 180 degrees to position the air inlet in the optimum location for most venting and air inlet needs. -
Page 45: Exhaust Vent And Intake Pipe Sizing
4. Check again to make sure the red wires and clear plastic hose connected to the flue adapter are properly connected and routed. F. EXHAUST VENT AND INTAKE PIPE SIZING 1. The exhaust vent and intake pipe size is 2" or greater. 2. -
Page 46: Exhaust Vent And Intake Pipe Installation
15. A screened straight coupling is provided with the heater for use as an outside exhaust termination. 16. A screened inlet air tee is provided with the heater to be used as an outside intake termination. The following information on Table 7 lists optional intake air/exhaust vent terminations available from HTP. DESCRIPTION STOCK CODE 2”... - Page 47 Equipment in Venting Section). The exhaust vent and intake piping lengths, routing and termination methods must all comply with the methods and limits given in the Venting section of this manual. When installing a combustion air intake from outdoors, care must be taken to utilize uncontaminated combustion air. NOTE: To prevent combustion air contamination, see Table 1.
-
Page 48: Part 8 - Gas Piping
Figure 27 – Venting with Optional Kits (NOT INCLUDED WITH THE WATER HEATER) NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required by local codes. All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼” per foot back to the heater to allow drainage of condensate. - Page 49 The gas supply shall have a maximum inlet pressure of less than 14" water column (350 mm), ½ pound pressure (3.5 kPa), and a minimum of 3.5" water column. The entire piping system, gas meter and regulator must be sized properly to prevent pressure drop greater than 0.5"...
-
Page 50: Gas Piping
B. GAS PIPING 1. Run the gas supply line in accordance with all applicable codes. 2. Locate and install manual shutoff valves in accordance with state and local requirements. 3. In Canada, the Manual Shutoff must be identified by the installing contractor. -
Page 51: Gas Valve
Ensure the pressure tap screw is properly tightened to prevent gas leaks. Failure to do so could cause substantial property damage, severe personal injury, or death. The gas piping must be sized for the proper flow and length of pipe to avoid pressure drop. The gas meter and regulator must be properly sized for the total gas load. -
Page 52: Part 9 - Field Wiring
Do not do a gas conversion on this heater without an officially approved conversion kit and instructions supplied by HTP. Failure to use a conversion kit when converting the heater to fire on Natural or LP gas will result in extremely dangerous burner operation, leading to fire, explosion, severe injury or death. - Page 53 Figure 30 LP-171 Rev. 3.3.15...
- Page 54 Figure 31 – NOTE: A resistor is provided between Bus Lines A and B. DO NOT REMOVE THIS RESISTOR! DOING SO WILL EFFECT HEATER OPERATION AND VOID WARRANTY! LP-171 Rev. 3.3.15...
-
Page 55: Part 10 - Field Wiring - Vision 1 Option
Figure 32 – MC Series Internal Connection Diagram PART 10 – FIELD WIRING – VISION 1 OPTION Outdoor Sensor Function The user can program the desired supply temperature based on the heat transmitter (baseboard, radiant floor, air handler) that will be used in the installation. - Page 56 Connected in the heater junction box, the Outdoor Sensor allows the user to automatically change the temperature going to the central heating loop. Route wires from the heater terminal strip to your outdoor sensor. Place the sensor preferably to the north or northwest or to the side which will be affected by changing weather conditions outside.
-
Page 57: Part 11 - Start-Up Preparation
Connection Specification – Wire 18 AWG maximum. Length of wire run cannot exceed 100 feet. PART 11 – START-UP PREPARATION Thoroughly clean and flush any system that has used glycol before installing the heater. Provide the customer with a material safety data sheet (MSDS) on the fluid used. -
Page 58: Freeze Protection (When Used)
B. FREEZE PROTECTION (WHEN USED) NEVER use automotive or standard glycol antifreeze, or ethylene glycol made for hydronic systems. System water, including additives, must be non-toxic, having a toxicity rating or Class of 1, as listed in Clinical Toxicology of Commercial Products. Use only freeze- prevention fluids certified by fluid manufacturer as suitable for use with stainless steel heaters, verified in fluid manufacturer literature. -
Page 59: Purge Air From Water System
1. Take the 5/16" flexible clear tube (rated for maximum temperature of 120°F) provided with the heater and place it over the barbed nipple on the manual air vent as shown in Fig. 31. 2. Fasten the tie wrap (provided) securely around the tube fastened to the barbed nipple on the manual air vent to keep the plastic tube from separating from the barbed nipple while purging the system. -
Page 60: Check For Gas Leaks
If the condensate outlet is lower than the drain, you must use a condensate removal pump, available at HTP (#554200). This pump is equipped with two leads that can be connected to an alarm or another type of warning device to alert residents of a condensate overflow, which, if not corrected, could cause property damage. -
Page 61: Part 12 - Start-Up Procedure
3. Fill condensate trap with water. 4. Verify electrical connections are correct and securely attached. Inspect exhaust vent and intake piping for signs of deterioration from corrosion, physical damage or sagging. PART 12 – START-UP PROCEDURE FOR YOUR OWN SAFETY READ BEFORE OPERATING 1. -
Page 62: Status Menu
To adjust, press either {S1} (Decrease Value) or {S2} (Increase Value) Ranges 5°F to 30°F. Press {S3} again and you will see the Indirect Setting de and an alternative value of 119 (with Vision Systems option). To adjust, press either {S1} (Decrease Value) or {S2}... -
Page 63: Programming The Vision I Option
water heater is satisfied, the Vision I system will switch back to the central heating circuit to continue to heat the living space at a temperature based on outside temperature. This gives you a higher comfort level and further increases heater efficiency. A. - Page 64 Step Modulation – Regulates the burner output in 6 steps in one-minute intervals. This reduces short cycling. 1 = on, 0 = off Indirect heater set point (flow) Temperature default = 119 to 180 Not applicable NOTE: The maximum water temperature leaving the heater is limited to 185 Table 11 - *Central Heating Curve Function Central heating demand is detected when the room thermostat closes.
-
Page 65: Part 14 - Troubleshooting
PART 14 – TROUBLESHOOTING A. ERROR CODE An error code may occur in the installation of the heater. This condition may lead to a lock out condition of the controller, which will need to be manually reset through the {S4}. These temporary codes will help the CONTROL PROGRAM REFERENCE CHART installer correct the problem before going into a lock out condition, which will require a DEFAULT... - Page 66 926 CONTROL BOARD ERROR CODES CODE DESCRIPTION DURATION CORRECTIVE ACTION 1. Disconnect the outdoor sensor from the wiring and measure its resistance. Compare the measured resistance to the table in this manual to see if it Outdoor sensor is open, corresponds to the temperature of the sensor.
-
Page 67: Part 15 - Maintenance
1. Watch the igniter through the observation window provided. No flame detected – The 2. If there is no spark, check the spark electrode for the proper ¼” gap by holding two quarters together and heater will make three sliding them through the gap. attempts at ignition before 3. -
Page 68: Maintenance Schedule For The Service Technician
heater. Installer must also inform the owner that the lack of proper care and maintenance of the heater may result in a hazardous condition. The installer should discuss the contents of the User's Information Manual with the owner. BEFORE EACH HEATING SEASON a trained and qualified service technician should perform the inspections and maintenance procedures as identified in this manual. -
Page 69: Maintenance Schedule For The Owner
2. Using a spray bottle filled with calcium and lime deposit remover, spray liberally on the coils, making sure the solution penetrates and funnels down through the condensate hose. If the condensate hose is blocked, let the chemical penetrate for at least 15 minutes or until it drains. - Page 70 Visually inspect the primary pressure relief valve and discharge pipe for signs of weeping or leakage. If the pressure relief valve often weeps, the expansion tank may not be operating properly. Immediately contact a qualified service technician to inspect the unit and system. ...
- Page 71 Figure 34 LP-171 Rev. 3.3.15...
- Page 72 Figure 35 LP-171 Rev. 3.3.15...
- Page 73 Figure 36 LP-171 Rev. 3.3.15...
-
Page 74: Heater Start-Up Report
HEATER START-UP REPORT LIGHT OFF ACTIVITIES DATE COMPLETED ________________ 1) Fill the Check all piping and gas connections, verify all heating system are tight Pressurize system (12-15 PSI) ____ PSI Add water to prime condensate cup What percentage of propylene glycol is ____ % installed in the system (0-50%) Verify near heater piping is properly supported... - Page 75 INSPECTION ACTIVITIES DATE LAST COMPLETED PIPING YEAR YEAR YEAR YEAR* Near heater piping Check heater and system piping for any sign of leakage, make sure they are properly supported. Vent Check condition of all vent pipes and joints. Check Gas piping, test for leaks and signs of aging. Make sure all pipes are properly supported.
- Page 76 LP-171 Rev. 3.3.15...
- Page 77 LP-171 Rev. 3.3.15...
-
Page 78: Maintenance Notes
MAINTENANCE NOTES LP-171 Rev. 3.3.15... -
Page 79: Htp Customer Installation Record Form
HTP CUSTOMER INSTALLATION RECORD FORM The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty claim. After reading the important notes at the bottom of the page, please also sign this document.
Need help?
Do you have a question about the MC50 and is the answer not in the manual?
Questions and answers
What size fuse, I need replacement fuse and can’t determine the suze
The replacement fuse for the HTP MC50 is 110 volts, 6.3 amps.
This answer is automatically generated