Econar GeoSource 2000 Operations Instructions download pdf (Page 15)

that drives the suction pressure below cutout conditions).

Hydronic side limits in cooling fall into the 25

F entering

water temperature range.

VII. ELECTRICAL SERVICE

The main electrical service must be protected by a fuse or

circuit breaker, and be capable of providing the amperes

required by the unit at nameplate voltage. All wiring

shall comply with the national electrical code and/or any

local codes that may apply. Access to the line voltage

contactor is gained through the knockouts provided on

either side of the heat pump next to the front corner.

Route EMT or flexible conduit with appropriate 3-

conductor wire to the contactor.

1WARNING - The unit must be properly grounded!1

,CAUTION: Three-phase units MUST be wired

properly to insure proper compressor rotation. Improper

phasing may result in compressor damage. An electronic

phase sequence indicator must be used to check supply-

wiring phase. Also, the “Wild” leg of the three-phase

power must be connected to the middle leg on the

contactor.

When supplying power to external water pumps with the

heat pump’s power supply, use only impedance protected

motors. An ECONAR PumpPAK can be wired directly

to the contactor and grounded in the grounding lug. A

pump relay and a terminal block (BP) are supplied in the

electrical box for the hydronic side pump (not available

on GW380’s). The relay will start the pump with a call

from the aquastat or thermostat. The pump relay is

activated by power to Y on the terminal strip of hydronic

units (wire Y to X). The use of impedance protected

pumps eliminates the need for additional fusing. Do not

connect more than a 1/3 horsepower pump to the internal

pump relay.

If larger pumps are required, a separate power supply is

required to supply the pump. To start this pump use a 24-

volt relay pulled in from the Y and X terminals.

VIII. 24 VOLT CONTROL

CIRCUIT

The wiring diagrams in Figures 7 and 8 show the low

voltage controls of the heat pump and some generic

external control schemes. This section will break down

the three basic components of the low voltage circuit;

transformer, thermostat/aquastat, and controller.

A. Transformer

Electrical diagrams are provided in Figures 7 and 8, and

also on the electrical box cover panel of the heat pump.

An internal 24-volt, 55 VA transformer (100 VA on

GW380’s) is provided to operate all control features of

the heat pump. Even though the 55 VA transformer is

larger than the industry standard 40 VA transformer, it

can still be overloaded quickly when using it for control

equipment like zone valves or fan coil relays. Table 4

shows the transformer usage for the hydronic heat pumps.

Table 4 – Transformer Usage (VA)

Component 29-67 98, 120 380

Contactor 7 7 x 2 14 x 2

Pump Relay 3 3 N/A

Reversing Valve 4 4 9

Controller 1 1 1

Thermostat 1 1 1

Total 16 VA 23 VA 39 VA

Available 39 VA 32 VA 61 VA

If the system’s external controls require more than the VA

available for external use from the transformer, an

external transformer must be used. You can see that in

Figure 5, the heat pump’s internal transformer can easily

power the external 24-Volt system. In contrast, Figure 4

shows a fan coil system with its own power supply, which

must be coupled to the heat pump to put the heat pump

into the cooling mode. This can be accomplished using

an isolation relay which isolates the fan coil power supply

from the heat pump's transformer (e.g. use the fan coils

independent power supply to energize the coil of a relay,

passing a signal across the N.O. contacts from the heat

pump's transformer).

The heat pump's transformer can generally power simpler

control systems consisting of a few relays or zone valves

(depending, of course, on the VA draw of the

components). On more complicated control systems the

transformers capacity is used up very quickly.

)Note: For units operating on 208V electrical service,

the transformer must be switched to the correct lead (see

electrical diagram – Figures 7 and 8). Units are factory

shipped with the transformer set for 240V service.

Operating a unit on 208V with the transformer set to

240V will cause the unit to operate with lower than

normal control voltage.

B. Thermostat/Aquastat

Consult the instructions in the thermostat box for proper

mounting and thermostat operation.

, CAUTION- miswiring of control voltage on system

controls can result in transformer burnout.

)Note: If a single thermostat controls multiple heat

pumps, the control wiring of the heat pumps must be

isolated from each other. This will prevent the heat

1 ... 14 15 16 ... 28

Comments to this Manuals

Scott jones 17 Apr 2024 | 22:42:08

I hate this never works

Econar GeoSource 2000 Operations Instructions Page 15

Comments to this Manuals

Related products and manuals for Heat pumps Econar GeoSource 2000