Rheem 27 874 Series - Plumbing Connections; Plumbing Connection Sizes; Water Inlet and Outlet Connections

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CONNECTIONS – PLUMBING
CONNECTION SIZES
Model
874 027
Hot water connection R¾/20
Cold water connection R¾/20
Gas inlet connection R¾/20
All plumbing work must be carried out by a qualified person and in accordance with the National Plumbing
Standard AS/NZS 3500.4 and local authority requirements.
All gas work must be carried out by a qualified person and in accordance with the New Zealand Gas
Installations Standard NZS 5261 and local authority requirements.
WATER INLET AND OUTLET
All pipe work must be cleared of foreign matter before
connection and purged before attempting to operate the
water heater. All olive compression fittings must use brass
or copper olives. Use thread sealing tape or approved
thread sealant on all fittings.
A full flow gate valve or ball valve must be installed on the
cold water line or solar preheat water line to the water
heater. A non return valve or stop tap must not be
installed. An acceptable arrangement is shown in the
diagram. Refer also to “Hot Water Delivery” on page 45
and to “Mains Water Supply” on page 44.
A disconnection union must always be provided at the cold
water inlet and hot water outlet on the water heater to
allow for disconnection of the water heater.
Insulation used on the cold and hot water lines must
extend up to the cold water inlet and hot water outlet of the
water heater.
Notes:
• It is essential all pipe connections be correctly aligned,
otherwise component connections within the water
heater may be strained and / or components
themselves misaligned. It is recommended also,
wherever possible, pipe connections be made at the
water heater first and final pipe runs be made in soft
copper pipe to allow some adjustment for
misalignment.
• Use the spanner flats on the water heater fittings and
take care to avoid twisting the water inlet and outlet
pipes inside the jacket.
• 874 series gas booster water heaters do not need to
be installed with a solar bypass valve.
• The maximum supply temperature to the water heater
when used as an in-series gas booster for a solar
preheat water heater is 80°C.
HOT
WATER
POWER
CORD
PRESSURE
LIMITING
VALVE
GATE VALVE
OR
BALL VALVE
GAS
COCK
COLD
WATER
GAS
Gas Water Heater
Cold and Hot Water Connection Details
HOT
WATER
POWER
CORD
GATE VALVE
OR
BALL VALVE
GAS
COCK
SOLAR
PREHEAT
WATER
GAS
Gas Booster for a Solar Preheater
Solar Preheat and Hot Water