Table of Contents
Advertisement
Quick Links
Installation and Service Manual
EMWT-HACW Series
Two-Stage R410a
Model Sizes 65-75
Two Tank Hydronic
Geothermal Heat Pumps
Maritime Geothermal Ltd.
Email: info@nordicghp.com
P.O. Box 2555
Web: www.nordicghp.com
Petitcodiac, N.B.
E4Z 6H4
Document Number: 000662MAN-03
Ph. (506) 756-8135
REVISION DATE: 01 MAR 2012
01 MAR 2012
Page 1
000662MAN-03
Advertisement
Table of Contents
Related Manuals for Maritime Geothermal EMWT-65-HACW-P-1T
Summary of Contents for Maritime Geothermal EMWT-65-HACW-P-1T
- Page 1 Installation and Service Manual EMWT-HACW Series Two-Stage R410a Model Sizes 65-75 Two Tank Hydronic Geothermal Heat Pumps Maritime Geothermal Ltd. Email: info@nordicghp.com P.O. Box 2555 Web: www.nordicghp.com Petitcodiac, N.B. E4Z 6H4 Document Number: 000662MAN-03 Ph. (506) 756-8135 REVISION DATE: 01 MAR 2012...
- Page 2 SAFETY PRECAUTIONS WARNING: Ensure all access panels are in place and properly secured before applying power to the unit. Failure to do so may cause risk of electrical shock. WARNING: Before performing service or maintenance on the heat pump system, ensure all power sources are DISCONNECTED.
-
Page 3: Table Of Contents
Table of Contents INSTALLATION INFORMATION: ……………………...……….……………………………………………………………… PAGE 5 Unit description: …………………………………………………………………………………………………..…... Page 5 Unpacking the unit: …………………………………………………………………………………………………... Page 5 Optimum Placement: …………………………………………………………………………………………………. Page 5 Electrical Provisions: ………………………………………………………………………………………………… Page 5 Circulator Pump Module Wiring (Ground Loop Only): …………………………………………………………. Page 5 Control Requirements: ……………………………………………………………………………………………..Page 5 Safety Controls: ………………………………………………………………………………………………………. - Page 4 Tables, Diagrams and Drawings TABLES Table 1 - Control Signal Description: …….………………………………………………………………..……..Page 5 Table 2 - Typical Aquastat Settings: ……………….……………………………………………………………... Page 6 Table 3 - Control Board Fault Codes: ……..……………………………………………………….……………... Page 6 Table 4 - Indicator Lights: …………………………………………………………………………………………… Page 6 Table 5 - Compressor Truth Table (Heating Priority): …..………………………………….…………………...
-
Page 5: Installation Information
Installation Information UNIT DESCRIPTION CIRCULATOR PUMP MODULE WIRING (GROUND LOOP ONLY) The EMWT-Series unit is a high efficiency R410a refriger- ant two-stage geothermal heat pump with a hot and cold buffer The heat pump has provisions for connecting the circulator tank, zone circulators, expansion tank, valves and gauges, and pump module so that the pumps will be turned on whenever the controls. -
Page 6: Safety Controls
tank temperature rate of change is reduced when only Stage 1 is active. 1. Low or no Hot Indoor loop flow. • 2. High Hot Indoor loop entering liquid temperature. Prolonged Stage 1 runtime leads to increased overall effi- 3. Dirty or fouled Hot Indoor loop heat exchanger. ciency as Stage 1 has a higher COP than Stage 2. -
Page 7: Loop Terminology
LOOP TERMINOLOGY ELECTRIC HEAT The following terms are used to describe the various The Hot Tank contains electric elements for the purpose “loops” of the EMWT heat pump system: of auxiliary / backup heat. The control for the electric heat comes from the Heating Aquastat Stage 2 signal. -
Page 8: Domestic Hot Water Connections
25. Open the fill hose valve. 26. Purge until no air can be heard leaving the system. CAUTION: the domestic hot water pump is water 27. Close the Cold Zone Ball Valve lubricated; damage will occur to the pump if it is 28. - Page 9 01 MAR 2012 Page 9 000662MAN-03...
- Page 10 000662MAN-03 Page 10 01 MAR 2012...
-
Page 11: Theory Of Operation
Theory of Operation TABLE 5 - Compressor Truth Table SYSTEM DESCRIPTION (Heating Priority) The EMWT-HACW heat pump is a stand alone reversing Heating Cooling Compressor system which contains both a hot and cold buffer tank. The unit Stage 1 Stage 2 Stage 1 Stage 2 Stage 1 Stage 2 Mode will maintain each of the tanks at the desired setpoint by auto- matically switching modes between heating and cooling. -
Page 12: Sizing And Hydronic Information
Sizing and Hydronic Information HYDRONIC SYSTEMS - GENERAL HEAT PUMP SIZING TABLE 7 depicts a rough guideline as to the size of home Hydronic systems typically provide heat through two different each heat pump size can handle for ground loop installations. types of media: •... - Page 13 01 MAR 2012 Page 13 000662MAN-03...
-
Page 14: Ground Water System Information
Ground Water System Information GENERAL REQUIREMENTS Another more common method of regulating the flow is by the use of a DOLE Valve. This valve will automatically control The temperature of the well water should be a minimum the amount of water flowing through it by varying the diameter of of 39°F (4°C), and should normally be 45+°F (7°C) a flexible rubber orifice through which the water passes. - Page 15 A return well should be a minimum of 80 ft. from the supply When snow comes it will usually cover the entire process well for residential applications. The water returned to the well much like a small spring. It is recommended that the pipe be will not necessarily be pumped into the same aquifer, depend- below the frost line when possible for maximum freeze protec- ing on underground conditions.
- Page 16 000662MAN-03 Page 16 01 MAR 2012...
-
Page 17: Ground Loop System Information
Optional fittings with P/T ports are available for the circulator pump modules sold by Maritime CIRCULATOR PUMP MODULE Geothermal Ltd.. Maritime Geothermal Ltd. has compact pump modules with FLUSHING & PURGING THE GROUND built in three way valves to facilitate filling and purging the LOOP ground loop. -
Page 18: Adding Antifreeze Solution
Once the lines have been filled and no more air bubbles are TABLE 11 - Volume of fluid per 100 ft. of pipe appearing in the line, adjust the circulator pump module valves Volume /100ft. to circulate water through the heat pump using the same technique as described above. - Page 19 01 MAR 2012 Page 19 000662MAN-03...
-
Page 20: Startup Procedure
A completed copy should be left on site, a copy kept on file by the installer and a copy should be sent to Maritime Geothermal Ltd. Check the boxes or fill in the data as each step is completed. For data boxes, circle the appropriate units. Fill in the top section of all three copies, or one copy if photocopies can be made after the startup has been completed. -
Page 21: Unit Startup
1. The installer shall sign and date the bottom of the Startup Record and then have the homeowner sign as well. The installer shall leave the Startup Record with the homeowner, retain a copy for filing and send a copy to Maritime Geothermal Ltd. for warranty registration. -
Page 22: Startup Record
Cooling S1 Setpoint, S1 Delta, S2 Setpoint, S2 Delta °F °C Date: Installer Signa- Homeowner Signa- ture: ture: A total of three copies are required, one for the homeowner, one for the installer and on to be sent to Maritime Geothermal Ltd. 000662MAN-03 Page 22 01 MAR 2012... -
Page 23: General Maintenance
General Maintenance GENERAL MAINTENANCE SCHEDULE Item Interval Procedure Contactor 1 year Inspect for pitted or burned points. Replace if necessary. Heat exchangers As required* Clean as per HEAT EXHCANGER FLUSING PROCEDURE below. Circulators 1 year Inspect for corrosion or leaks Expansion Tank 1 year Inspect for corrosion or leaks, verify bladder pressure. -
Page 24: Troubleshooting Guide
Troubleshooting Guide The following steps are for troubleshooting the geothermal heat pump. If the problem is with the domestic hot water or the auxilliary/backup electric heat, proceed to the relevant section at the end of the troubleshooting guide. STEP 1: Verify that the display is present on the heating or cooling aquastat. If it is not present on either, proceed to POWER SUPPLY TROUBLE SHOOTING, otherwise proceed to STEP 2. - Page 25 AQUASTAT TROUBLESHOOTING Fault Possible Cause Verification Recommended Action No signal to Y of Incorrect aquastat setup. Aquastat does not indicate S1 on Correct the setup. safety board the display. Faulty aquastat. No 24VAC between Stage 1 NO Replace aquastat. and COM of the aquastat when S1 is indicated on the aquastat display.
- Page 26 COMPRESSOR TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Compressor will Tripped or faulty compres- Reset if tripped. If not tripped verify Determine why breaker was not start sor breaker that there is 230VAC across L1 and tripped. Replace breaker if faulty. L3 of the compressor contactor.
- Page 27 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High Discharge Aquastat set too high. Verify aquastat setting Lower aquastat setting to recom- Pressure mended value of 115°F (46°C) Low or no flow in heat ex- Check that isolation flanges and Ensure flow path is unrestricted.
- Page 28 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High Suction Leaking reversing valve. Reversing valve is the same tempera- Replace reversing valve. Pressure ture on both ends of body, common (may appear to suction line is warm, compressor is not be pumping) running hot.
- Page 29 OPERATION TROUBLESHOOTING - COOLING MODE Fault Possible Cause Verification Recommended Action High Discharge Unit is overcharged. High sub-cooling, low delta T Remove 1/2lb of refrigerant at a pressure (Only possible if unit has across water coil. time and verify that the discharge been opened in the field pressure reduces.
- Page 30 ELECTRIC HEAT TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action No Electric Heat Tripped or faulty electric Reset if tripped. If not tripped verify Determine why breaker was heat breaker. that there is 230VAC across L1 and tripped. Replace breaker if faulty. L3 of the electric heat contactor.
- Page 31 ZONE TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action No hot water to Faulty zone thermostat, No 24VAC signal present across T Locate the problem and correct it. individual wiring or zone valve and C of the heat pump terminal heating zone head(s) strip.
- Page 32 DOMESTIC HOT WATER (DHW) TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action Insufficient hot Thermostat on hot water Visually inspect the setting. Readjust the setting to 120°F. water tank set too low. Should (140°F if required by local code) (Tank Problem) be set at 120°F.
-
Page 33: Repair Procedures
The heat pump is now ready for repairs. Always ensure nitrogen is flowing through the system during any soldering procedures to prevent soot buildup inside the pipes. Maritime Geothermal Ltd. recommends re- placing the liquid line filter-drier anytime the refrigeration system has been exposed to the atmosphere. -
Page 34: Refrigeration Circuit Diagrams
REFRIGERATION CIRCUIT DIAGRAM 000662MAN-03 Page 34 01 MAR 2012... - Page 35 REFRIGERATION CIRCUIT DIAGRAM (continued) 01 MAR 2012 Page 35 000662MAN-03...
-
Page 36: Model Specific Information
Model Specific Information This section provides general information particular to each model. For complete specifications please see the specifications This section provides information particular to each model. For complete specifications please see the specifications docu- document for the desired model. ment for the desired model. -
Page 37: Table 16 - Standard Capacity Ratings - Ground Loop Cooling 60Hz
Table 16 - Standard Capacity Ratings - Ground Loop Cooling* 60Hz STAGE 1 - ELT 68°F (20°C) EWT 53.6°F (12°C) STAGE 2 - ELT 77°F (25°C) Liquid Flow Outdoor Input Model Size Mode Capacity (Outdoor & Indoor) Pressure Drop Energy Tons IGAL Watts... -
Page 38: Capacity Ratings
CAPACITY RATINGS Heating Mode EMWT-65-HACW-P-1T Nominal 5 ton R410a 60 Hz Source Data (Outdoor Loop) Power Consumption Sink Data (Indoor Loop) Evap. Cond. Flow Delta T Total Effective COPh Flow LWT Delta T Temp Temp. Output °F °F Igpm °F °F... - Page 39 CAPACITY RATINGS - continued Heating Mode EMWT-75-HACW-P-1T Nominal 6 ton R410a 60 Hz Source Data (Outdoor Loop) Power Consumption Sink Data (Indoor Loop) Evap. Cond. Flow Delta T Total Effective COPh Flow LWT Delta T Temp Temp. Output °F °F Igpm °F °F...
-
Page 40: Electrical Tables
Table 18 - Heat Pump Electrical Information (230-1-60) Internal Electric Outdoor Max Fuse/ Wire Model Size Compressor Circulators Elements Circulators Breaker Size Tons Amps Amps Max A Amps Amps Amps 28.6 84.9 104.1 #1-3 30.4 86.7 106.3 #1-3 Table 19 - Heat Pump Electrical Information (208-3-60) Internal Electric Outdoor... -
Page 41: Electrical Diagrams (230-1-60)
ELECTRICAL DIAGRAMS (230-1-60) 01 MAR 2012 Page 41 000662MAN-03... - Page 42 ELECTRICAL DIAGRAMS (230-1-60) - continued 000662MAN-03 Page 42 01 MAR 2012...
-
Page 43: Case Details
CASE DETAILS Front View Back View Right Side View 01 MAR 2012 Page 43 000662MAN-03... -
Page 44: Warranty Information
LIMITED EXPRESS WARRANTY It is expressly understood that unless a statement is specifically identified as a warranty, statements made by Maritime Geothermal Ltd., a corporation registered in New Brunswick, Canada, (“MG”) or its representatives, relating to MG’s products, whether oral, written or contained in any sales literature, catalogue or agreement, are not express warranties and do not form a part of the basis of the bargain, but are merely MG’s opinion or commendation of MG’s products.