Install Instructions

ManualsBrandsEemax ManualsCooling & Air QualityFlow Controlled Electric Tankless Water Heater With Pipe Compression Fittings On Top Of Unit

2) PLUMBING HOOK-UP

1) The unit is supplied with compression fittings. USE THESE: DO NOT

USE THREADED PIPE FITTINGS. DO NOT USE PIPE DOPE

OR TEFLON TAPE ON THIS INSTALLATION. Ensure the inlet filter supplied

with this unit is in place.

2) Take care to ensure that the pipes are correctly aligned with the inlet and

outlet bosses in order to avoid excessive stress on the heater body molding.

NOTE: Run water through the supply pipe to remove all debris from the

pipe before connecting the heater. Failure to do so could damage the flow

switch.

3) Install isolating valves (full flow ball valve type) on both inlet and outlet

pipes. This allows unit to be isolated for maintenance purposes. (Fig. 2)

4) When all plumbing is complete, fully check the system for water leaks

at all plumbing connections. If leak is present take corrective action. If leak

is at the compression fitting, slowly tighten compression nut until it stops.

Ensure compression fittings are tighten to 18FT.LB

Fully open both inlet and outlet ball valves.

Run all hot water outlets fed by this heater one at a time for a minute or two

until the water flow is continuous, free from “gulping” and from all visible air

pockets.

NOTE:

ALL PLUMBING MUST BE COMPLETED BEFORE YOU

PROCEED WITH THE ELECTRICAL HOOK-UP.

TEST THE INSTALLATION FOR LEAKS BEFORE

CONNECTING THE ELECTRICAL SUPPLY.

4) COMMISSIONING YOUR HEATER

IMPORTANT

Before switching “on” the power at the breaker make sure that the hot

water circuit is free of air pockets or premature failure of the heating element will occur.

To do this open all hot water faucets one at a time for a minute or two until the water flow

is continuous and free from “gulping” and from visible air pockets.

1) With inlet and outlet BALL VALVES fully open, turn on all hot water outlets.

2) Run for 5 minutes, turning faucet “on” and “off” repeatedly.

3) Switch on electric supply at breaker.

4) The power indicator light should now come on (see Fig. 1).

NOTE: At this point water temperature may not be very hot.

5) Using the OUTLET BALL VALVE slowly reduce water flow until desired

temperature is achieved at hot water outlet.

NOTE: The water temperature is proportional to the flow through the heater.

The lower the flow the higher the temperature and vice versa.

6) Check performance of flow switch by opening and closing outlet valve a few times.

The power indicator light should be on ONLY when water is flowing through the unit.

For expected temperature rise at various rates of flow see chart.

NOTE: An EX95 (9.5 kW) unit at 240 V will deliver 1 gallon per minute at 65

temperature rise. For example, with incoming water temperature at 45

F the

unit will produce 1 gallon per minute at 110

7) It is possible that drawing off cold water at comparatively high rates of flow

elsewhere in the building at the same time that the heater is working, could

cause premature element failure. Care should be taken not to starve the unit

of cold water. To prevent this from happening, open fully the main valve on

the cold supply to the building and throttle back the control valves to the other

cold water outlets.

Hot outlet

compression

fitting

DO NOT

SOLDER

Cold inlet

compression

fitting

DO NOT

SOLDER

Fig 1

1 1/2 “

Inlet filter

Note: EX65 “Twin” comes with two faucet mounted aerators, these should

be mounted on both the faucets served by this unit. EX65 “Single” comes

with one faucet mounted aerator and 3/8” compression fittings with integral

flow restrictor.