WBRCLP140W User Manual

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whl-648 Rev. 000 Rel. 003 Date 3.6.18

Table of Contents

Part 1 - General Safety Information 5

A. Operation and Installation Warnings 5

B. Improper Combustion 6

C. Gas 6

D. When Servicing the Appliance 7

E. Appliance System 7

F. Water Chemistry Requirements 7

G. Freeze Protection 7

H. Water Temperature Adjustment and Scalding 8

I. High Elevation Installations 8

Part 2 - Before You Start 9

A. What’s in the Box 9

B. Optional Equipment 9

Part 3 - Prepare the Appliance Installation 10

A. Locating the Appliance 10

B. Leveling 10

C. Clearances for Service Access 11

D. Residential Garage and Closet Installations 11

E. Exhaust Vent and Intake Pipe 11

1. Direct Vent of Exhaust and Intake 12

2. Power Venting, Indoor Combustion Air in Conned or Unconned

Space 12

F. Carbon Monoxide Detectors 12

G. Prevent Combustion Air Contamination 12

H. Removing a Appliance from a Common Vent System 13

I. Technical Specications 14

J. Wall-Mounting (Wall Mount Models Only) 17

K. Flow Restrictor 18

Part 4 - Water Piping 19

A. General Plumbing Guidelines 19

B. Backow Preventer 20

C. Expansion Tank 20

D. Piping the Appliance 20

E. Applications 21

G. CH and DHW Pressure Relief Valves 28

The hydronic supply and return connections of these products

are for installation in closed loop systems ONLY! Use of this

product in any manner other than described in this manual may

result in premature product failure, substantial property damage,

severe personal injury, or death. Damage or failure of this product

(or the system in which it is installed) due to unauthorized use IS

NOT COVERED BY WARRANTY.

IMPORTANT

In accordance with Section 325 (f) (3) of the Energy Policy and

Conservation Act, Westinghouse has provided this appliance

with multiple features designed to save energy by reducing the

appliance water temperature as heating load decreases.

These features include:

tA modulating combustion system that adjusts ring rate

based on heat demand.

tAdjustment of appliance set point based on inferred heat

load as determined by an outdoor sensor. The outdoor

sensor is supplied by Westinghouse with this appliance.

tThis appliance does not include a standing pilot.

tThis appliance is designed and shipped to assure the

highest eciency operation possible. Such high eciency

is achieved by limiting heating circuit water temperature

to 140°F when there is no anticipated heat load, based

upon the outdoor sensor and the Outdoor Reset Curve

(sensor response curve) in the appliance software.

tThis feature may be over-ridden as described below in

specic installations:

tThe appliance control is equipped with an outdoor sensor

override for use with building management systems or in

cascaded systems (for systems with total input of 300,000

BTU/hr or greater).

See statement below for an important notice on the use of the

override.

IMPORTANT

In accordance with Section 325 (f) (3) of the Energy Policy and

Conservation Act, this appliance is equipped with a feature that

saves energy by reducing the appliance water temperature as

the heating load decreases. This feature is equipped with an

override which is provided primarily to permit the use of an

external energy management system that serves the same

function. THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST

ONE OF THE FOLLOWING CONDITIONS IS TRUE:

tAn external energy management system is installed that

reduces the appliance water temperature as the heating

load decreases.

tThis appliance is not used for space heating.

tThis appliance is part of a modular or multiple appliance

system having a total input of 300,000 BTU/hr or greater.

tThis appliance is equipped with a tankless coil.

The CSD-1 ASME Code, Section CW-400 requires that hot water

heating and supply appliances have a) a UL 353 temperature

control device, b) at least one (1) temperature-actuated control

to shut o the fuel supply when system water reaches a preset

operating temperature, c) a high temperature limit control that

prevents the water temperature from exceeding the maximum

allowable temperature by causing a safety shutdown and lockout,

and d) its own sensing element and operating switch.

The temperature control system integrated into the 926

control provided with this heating appliance complies with the

requirements of CSD-1 Section CW-400 as a temperature operation

control. The control monitors the temperature dierence between

the inlet and the outlet sensor, which is aected by appliance water

ow. If this temperature dierence exceeds 55°F (typically because

of low water ow or very low heat load), the control will reduce

the maximum fan speed. If the temperature dierence exceeds

60°F, the control will eectively sense there is little or no water

ow or heat load and shut the appliance down. The controller

will restart automatically once the temperature dierence has

dropped below 55°F and the minimum o time (anti-cycle time)

has expired. In addition, if the control senses that the outlet water

temperature has reached 210°F, the appliance is put into a hard

lockout and requires manual reset to restart.

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User Manual - Page 4