Maritime Geothermal EMWT-65-HACW-P-1T, Инструкция по установке и обслуживанию

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01 MAR 2012 Page 7 000662MAN-03
LOOP TERMINOLOGY
The following terms are used to describe the various
“loops” of the EMWT heat pump system:
•
Outdoor Loop— Connections for the ground loop
exchanger or ground water system.
•
Hot Zone Loop—Connections for building heating
zone loop. The Hot Zone
Circulator provides flow for this
loop.
•
Cold Zone Loop—Connections for building cooling
zone loop. The Cold Zone
Circulator provides flow for this
loop.
•
Hot Indoor Loop—Hot water loop between the
condenser and the Hot buffer
tank (inside the unit).
•
Cold Indoor Loop—Cold water loop between the
evaporator and the Cold buffer
tank (inside the unit).
•
DHW Loop—Connections for the Domestic Hot Water.
INTERNAL HYDRONIC COMPONENTS
The EMWT-Series unit has virtually everything required for
a hydronic installation built into it, including the following:
•
50 USGAL (189L) Hot buffer tank with electric backup
•
50 USGAL (189L) Cold buffer tank
•
Pre-charged expansion tank
•
75PSIG pressure relief valve
•
Hot Zone Circulator (B&G NRF-36) with isolation
valves
•
Cold Zone Circulator (B&G NRF-36) with isolation
valves
•
Pressure gauges
•
Shutoff valves and boiler drains for purging
•
Individual heating and cooling tank aquastats
Refer to
Diagram B for the locations of the components. The
pump curve for the Heating and Cooling zone circulators is
shown in
Diagram A.
ELECTRIC HEAT
The Hot Tank contains electric elements for the purpose
of auxiliary / backup heat. The control for the electric heat
comes from the Heating Aquastat Stage 2 signal. The signal
passes through a 0– 2H timer before reaching the electric heat
contactor coil. The timer is set to 1H ( one hour) at the factory.
The unit is shipped with the electric heat breaker in the off
position. IT IS VERY IMPORTANT THAT THE INDOOR LOOP
IS FLOODED AND PRESSURIZED BEFORE TURNING ON
THE ELECTRIC HEAT BREAKER.
An electric element that is
not under water will burn out in a matter of seconds. There is a
safety pressure switch mounted to the side of the Hot Tank,
the
electric heat contactor will not engage unless the pressure
in the indoor loop is above 10PSIG.
Should the heat pump
require service, the compressor breaker should be turned off.
This prevents the refrigeration section from operating but allows
the electric heat to continue operating until the unit can be re-
paired.
HEATING ZONE CONNECTIONS
The Heating Zone ports are 1” FPT brass fittings (refer to
CASE DETAILS ). The heating zone header pipes can be con-
nected to these ports. The Heating Zone Circulator is activated
by connecting R and HZ together via dry contacts.
COOLING ZONE CONNECTIONS
The Cooling Zone ports are 1” FPT brass fittings (refer to
CASE DETAILS ). The cooling zone header pipes can be con-
nected to these ports. The Cooling Zone Circulator is activated
by connecting R and CZ together via dry contacts.
PURGING THE INDOOR SYSTEM
There are ball valves and boiler drains inside the unit to
facilitate filling and purging. Refer to DIAGRAM B and drawing
000421RCD for component locations. Once the system has
been filled with the desired fluid, purging may be done in the
following manner:
1. Connect a fill hose to the Hot Zone Boiler Drain.
2. Connect a drain hose to the Hot Indoor Boiler Drain.
3. Close the top isolation valve of the Hot Zone Circulator.
4. Close the top isolation valve of the Hot Indoor Circulator.
5. Open the Hot Zone and Hot Indoor Boiler Drains.
6. Open the fill hose valve.
7. Purge until no air can be heard leaving the drain hose.
8. Close the Hot Zone Ball Valve and the Hot Indoor Ball
Valve.
9. Open the top isolation valve of the Hot Zone and Hot Indoor
Circulators.
10. Close the Cold Indoor Ball Valve.
11. Purge until no air can be heard leaving the drain hose.
12. Close the Hot Zone and Hot Indoor Boiler Drains.
13. Move the drain hose to the Cold Indoor Boiler Drain.
14. Open the Cold Indoor Boiler Drain.
15. Close the top isolation valve of the Cold Indoor Circulator.
16. Open the Cold Indoor Ball Valve.
17. Open the Hot Zone Boiler Drain.
18. Purge until no air can be heard leaving the system.
19. Close the Cold Indoor Ball Valve.
20. Close the fill hose valve.
21. Close the Hot Zone Boiler Drain and the Cold Indoor Boiler
Drain.
22. Move the fill hose to the Cold Zone Boiler Drain.
23. Close the top isolation valve of the Cold Zone Circulator.
24. Open the Cold Zone and Cold Indoor Boiler Drains.
DIAGRAM A - B&G NRF-36 Pump Curve