Piping Installation - Johnson Controls JRE Series Installation Operation & Maintenance

Water source heat pumps

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Table of Contents

� WARNING! �

WARNING! Piping must comply with all applicable Codes.

Supply and Return Piping - Follow these piping guidelines.

1. Install a drain valve at the base of each supply and

return riser to facilitate system flushing.

2. Install shut-off/balancing valves and unions at each

unit to permit removal of unit, if required.

3. Place strainers at the inlet of each system circulating

pump to ensure a clean system.

Always insulate where the piping runs through unheated

areas or outside the building. If loop temperature is

maintained between 60°F and 90°F, piping will not

sweat nor lose heat under normal ambient conditions.

Otherwise, insulation is required on loop water piping.

All loop piping above grade must be insulated on any unit

connected to an open or closed geothermal loop (GLHP,

GWHP).

Pipe joint compound is not necessary when Teflon

threaded tape is pre-applied to hose assemblies or when

flared-end connections are used. If pipe joint compound

is preferred, use compound only in small amounts on the

male pipe threads of the fitting adapters. Prevent sealant

from reaching the flared surfaces of the joint.

Maximum allowable torque for brass fittings is 30 foot-

pounds. If a torque wrench is not available, tighten

finger-tight plus one quarter turn. Tighten steel fittings as

necessary.

Note: The manufacturer strongly recommends all piping

connections, both internal and external to the unit, be

pressure tested by an appropriate method prior to any

finishing of the interior space or before access to all

connections is limited. Test pressure may not exceed

the maximum allowable pressure for the unit and all

components within the water system. The manufacturer

will not be responsible or liable for damages from water

leaks due to inadequate or lack of a pressurized leak

test, or damages caused by exceeding the maximum

pressure rating during installation.

T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y

I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e

Condensate Piping - Install a condensate trap at each

unit with the top of the trap positioned below the unit

condensate drain connection.

Design the length of the trap (water-seal) based upon the

amount of positive or negative pressure on the drain pan.

As a general rule, 1 inch of trap is required for each 1 inch

of negative pressure on the unit with a 1.5 inch (38 mm)

minimum. Each unit must be installed with a dedicated

trap for that unit.

Note that condensate may be allowed to drain onto

the roof.

Figure 2: Condensate Drain

1.5"

* Some units include a painted drain connection.

Using a threaded pipe or similar device to clear

any excess paint accumulated inside this fitting

may ease final drain line installation.

� WARNING! �

WARNING! Polyolester Oil, commonly known as POE oil, is

a synthetic oil used in many refrigeration systems including

those with HFC-410A refrigerant. POE oil, if it ever comes

in contact with PVC or CPVC piping, may cause failure of

the PVC/CPVC. PVC/CPVC piping should never be used

as supply or return water piping with water source heat

pump products containing HFC-410A as system failures and

property damage may result.

� CAUTION! �

CAUTION! Corrosive system water requires corrosion-

resistant fittings and hoses and may require water treatment.

JRE - Series

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