Slant/Fin Jaguar Caravan Application Manual

HOT WATER/GAS
MODULAR BOILERS

®

APPLICATION GUIDE

Guidelines for the design, purchase and installation of Slant/Fin Jaguar Caravan gas-fired, hot water modular boiler systems.

CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Recommended Piping . . . . . . . . . . . . . . . . . . . . . .2

Optional factory supply and return headers . . . . . .7

SC- control bill of materials . . . . . . . . . . . . . . . . . .9

Gas piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Field wiring at modules . . . . . . . . . . . . . . . . . . . . .12

SC-3 system wiring . . . . . . . . . . . . . . . . . . . . . . . .12

SC-9 space heating wiring . . . . . . . . . . . . . . . . . .14

SC-9 space and domestic hot water wiring . . . . .16

CODES AND STANDARDS

All Caravan installations must comply to local codes or, in the
absence of local codes, to the National Fuel Gas Code, ANSI,
Z223.1-latest edition.

In addition where required by the authority having jurisdiction, the
installation must conform to American Society of Mechanical
Engineers Safety Codes for controls and safety devices for
automatically fired boilers, No. CSD-1. The installation must also
conform to the additional requirements of Slant/Fin Instruction Book
publication no. J-40 latest edition.

All electrical wiring is to be done in accordance with the National
Electrical Code ANSI/NFPA No. 70-latest edition and all local electri­cal codes. The unit must be electrically grounded if an external

wer source is used.

po

In Canada, the installation must be in accordance with standards
CGA B149.1 and B149.2, installation codes for gas burning
appliances and equipment and/or local codes. All electrical
connections are to be made in accordance with Standard C.S.A.
C22.1 Canadian Electrical Code Part 1 and/or local codes.

INTRODUCTION OF FRESH WATER

Introduction of excessive amounts of fresh water into a system can
cause scaling and leave deposits in the boiler and the surrounding
pipes. This will lead to inefficient boiler operation and breakdown.
Fresh water will enter the system as a result of hidden leaks such
as may occur in underground piping. Relief valves should be piped
to a location that shows visible signs of relief.

Process applications that use fresh water
exchangers. Any process application that results in introduction of

ater into a boiler can cause scaling with deposits for

fresh w
the boiler and surrounding piping. This will damage the boiler.
Introduction of fresh water from leaks will cause similar damage.

In some areas it ma
control the corrosive makeup of the feed water. Check with the local
authority, to determine if the feed water will need a conditioning
treatment before being supplied to the boiler.

y be necessary to use a f

, require the use of heat

ming in

eed water treatment to

Printed in the U.S.A. 1008 Publication No. CJ-10-HWG

www.slantfin.com

Jaguar Caravan Modular Boilers2

INTRODUCTION

This application manual is intended to provide the piping and control
method for applying multiple Jaguar J-390 boilers to a space heat-

ng and domestic hot water heating system. Use this manual, in

i
conjunction with the Jaguar J-390 Installation and Operating
Instructions, publication J-40.

The following sections of the Installation and Operating Instructions
must be adhered to:

1. Boiler location and foundation

2. Clearances to combustibles

3. Contamination prevention
. Air supply and ventilation

4

5. Venting application and materials*

6. Water treatment

7. Condensate disposal

8. Operating instructions

9. Care and Maintenance

*Common venting of these appliances is not permitted. Vent pipes in
a non-direct venting system can be clustered together, at their termi­nation point. Direct vent terminals cannot be clustered together or
stacked vertically. Direct vent terminals can be mounted side by side
horizontally, provided there is a 12" minimum distance between
them.

RECOMMENDED PIPING AND WATER FLOW

Good system design addresses flow rates through boilers. It is
possible to have too little flow and too much flow. Most boiler sys­tem designs are based on a 20˚F to 30˚F temperature rise in the
boiler when it is firing at full input.

When the flow rate is too high through a module the water flow
tends to short circuit from the return tapping to the supply tapping
of a module. When flow rate is too high the boiler efficiency may
drop and there is excess electrical consumption by the circulator.

Primary/secondary piping is recommended for multiple Jaguar

oilers. This method ensures that each boiler will receive the

b
same inlet water temperature, and only the boilers that are firing
will have water flowing through them. Each boiler must have a
dedicated circulator piped on it’s supply. See figures 1a through 4

or the location of components and piping layout.

f

If a single low water cutoff is installed in the common header
water piping to protect all of the boilers, no isolation valves are
permitted on the individual boiler piping between the low water
cutoff and each boiler. See figures 1a and 2a.

If isolation valves are installed in the individual boiuler piping to
the common headers, a dedicated low water cutoff must be
installed on each boiler’s piping, as close to the boiler as possible
and beneath the isolation valves. See figures 1b and 2b.

SPACE HEATING

The primary loop must have its own system pump, and closely
spaced tees for the secondary loop interconnection. By keeping
the pressure drop very low, water that is flowing in the primary
loop will not flow into the secondary circuit until each boiler’s cir­culator turns on.

DOMESTIC HOT WATER HEATING

A motorized valve can be installed within the supply water heater
to divert the water flow of one or more boilers to a heat exchang­er during a domestic water need. See figures 2a and 2b. This can
provide instantaneous delivery or storage of the domestic hot
water. See figures 2a through 4 for method.

Jaguar Caravan Modular Boilers 3

Figure 1a. Jaguar multiple boiler space heating primary- secondary pumping system with low water cutoff in common header.

Jaguar Caravan Modular Boilers4

Figure 1b. Jaguar multiple boiler space heating – Primary-secondary pumping system with low water cutoffs on each individual boiler.

Jaguar Caravan Modular Boilers 5

Figure 2a. Jaguar multiple boiler space heating and domestic hot water primary-secondary pumping system with low water cutoff in common header.

Jaguar Caravan Modular Boilers6

Figure 2b. Jaguar multiple boiler space heating and domestic hot water. Primary-secondary pumping with low water cutoffs on each individual boiler.