Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual download pdf (Page 31)

* Net Manifold Pressure equals the measured manifold pressure minus the chamber

pressure. See Figure 31 to measure the Net Manifold Pressure.

POOL HEATER PIPING

INSTALLATION

Install piping from the filter system to the pool heater as shown

in the pool heater piping diagrams. See Figures 34 - 38.

Minimum pipe diameter to and from the installed pool heater

to the filter system piping on models 500,000 - 750,000 Btu/hr

is 2" and on models 990,000 - 2,070,000 Btu/hr the minimum

is 2-1/2". The piping from the filter system to the pool heater

may be PVC, CPVC or Copper Pipe. The piping from the

pool heater back to the filter system will carry water with

temperatures in excess of 110°F and must be CPVC or

Copper Pipe. The temperature of the heated water from the

pool heater will be substantially cooled as it is mixed back into

the pool water from the filter system and returned to the pool.

The mix of heated water and pool water from the filtration

system should only be slightly warmer than the pool water

before the connections from the pool heater.

Auxiliary Mixed Water Limit Control

Ensure that the auxiliary 110°F mixed water limit control (and

optional pool supply sensor, if used) are installed in the filter

system piping. Install the auxiliary limit a minimum of three

feet downstream from the point where the heated water from

the pool heater is added to the filtration system. See Figures

34 - 38. The limit and sensor may be mounted in 3/8" NPT

tapped fittings installed in the filtration system piping or they

may be installed directly into tapped openings in the PVC filter

system piping. Turn off the filter system pump when installing

the auxiliary limit and sensor in the filtration system piping.

Tapped openings can be added to the PVC pipe by first drilling

9/16" pilot holes in the PVC pipe at least three feet

downstream of the point where the heated water from the pool

heater is added to the filter piping. The drilled pilot holes can

now be carefully threaded with a 3/8" NPT taper tap. After the

pipe threads have been cut into the PVC pipe wall, the limit

and bulbwell can be inserted into the tapped openings. Apply a

small amount of a high quality RTV silicone sealant to the

threads to prevent leaks and install the limit and bulbwell into

the threaded openings in the pipe. Install the limit control and

bulbwell and tighten to seal. Do not over tighten either part

into the threaded openings in the PVC pipe. Over tightening

can damage the parts and/or strip the threads cut into the

plastic pipe. Install the pool supply sensor into the bulbwell

and connect it to the pool heater circuit as shown in the wiring

diagram for your model. Wire the limit into the pool heater

control circuit as shown in the wiring diagram. If additional

wire length is needed, use 18 GA wire for distances up to 30 ft.

For longer distances, size the wire per Table M, page 37. Use

weatherproof connections for outdoor installation.

Pumped Automatic Bypass

This is a high efficiency pool heater which requires a special

pumped bypass for proper operation. The bypass assembly

supplied with the pool heater includes a pump and a 3-way

mixing valve. All piping to connect the filter system to the

pool heater is made directly to the bypass piping on the pool

heater.

Outdoor Operation - Outdoor 3-Way

Automatic Bypass Valve Cover

The pump supplied on the pool heater bypass has a sealed

motor suitable for outdoor installations. When installing the

3-way automatic bypass valve outdoors, an outdoor valve

cover is required. An outdoor valve cover is supplied with an

optional outdoor vent kit (see Table H, page 26 of this manual).

To install the outdoor valve cover, follow the steps below:

1. Turn off power to the unit.

2. Remove the plastic actuator cover from the 3-way

automatic bypass valve by loosening the screw above the

conduit fitting (Figure 32).

3. Grasp the cover on the screw side and lift the cover up and

away from the valve.

4. Disconnect the wires at the terminal block (if connected).

5. Unscrew the plastic conduit cap from the conduit fitting

(Figure 32) and pull the plastic conduit hose and wires

from the valve.

6. Feed the plastic conduit hose through the opening of the

valve cover end cap (JKD6654) (see Figure. 32) and slide

the end cap approximately one foot up the conduit.

7. Reconnect the wires to the 3-way valve circuit board as

shown in Figure 33.

8. Feed the conduit hose into the conduit fitting and

reinstall the conduit cap.

Installation and Service Manual

500,000 - 750,000

Nat. Gas 1.8" w.c.

LP Gas 4.6" w.c.

990,000 - 2,070,000

Nat. Gas 1.2" w.c.

LP Gas 4.6" w.c.

TABLE-L

Net Manifold Pressure

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 59 60

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Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual Page 31

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