LAARS Mini-Combo II MCS User Manual
Installation and Operation Instructions Document 8001F
Installation
and Operation
Instructions for
TM
Mini-Combo II
(Models MCT, MCS)
Residential Gas-Fired
Space/Water Heater
NOTE: This manual is to be used in conjunction
with Document 1025, Installation and Operation
Instructions for Mini-Therm II JV boilers.
U.S. Trademark Reg. 2,094,168
China Trademark Reg. 988,311
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty.
If the information in this manual is not
WARNING
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed by
a qualified installer, service agency, or gas
supplier.
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou
pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inflammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualifié ou
par le fournisseur de gaz.
AVERTISSEMENT
H2077800F
A subsidiary of BRADFORD WHITE Corporation
Page 2
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1.
General Information
1.1 Introduction....................................................... 3
SECTION 2.
Installation
2.1 Location ............................................................ 3
2.2 Heater Placement ............................................. 3
2.3 Piping ............................................................... 5
2.4 Wiring ............................. 5, 6, 7, 8, 9, 10, 11, 12
2.5 Sequence of Operation .................................. 13
SECTION 3.
Replacement Parts
3.1 Ordering Information ...................................... 15
3.2 Parts List ........................................................ 15
Mini-Combo II
Page 3
SECTION 1.
General Information
WARNING
This manual supplies information on the application,
installation and operation of the indirect water heater
unit.
A complete instruction manual of the operation of
the hydronic boiler (Document 1025) is supplied along
with this manual. Both manuals should be reviewed
completely before proceeding with the installation.
• Failure to follow the instructions provided may result
in personal injury, death or substantial property
damage.
• Any modifications to the boiler, water tank, gas and
water connections, or wiring may void warranty.
• Consult the factory or local factory representative
with any questions or problems regarding this
equipment.
AVERTISSEMENT
Ce manuel donne des renseignements sur
l’application, l’installation et le fonctionnement du
chauffe-eau indirect. Un manuel complet d’instruction
sur le fonctionnement de la chaudière hydronique
(Document 1025) est fourni avec ce manuel. Les deux
manuels doivent être examinés attentivement avant
de procéder à l’installation.
• Si les instructions ne sont pas suivies, il peut en
résulter des blessures personnelles, la mort ou des
dégâts matériels substantiels.
• Toute modification apportée à la chaudière, au
réservoir d’eau, aux branchements de gaz et d’eau
ou aux fils électriques peut invalider la garantie.
• Consultez le représentant de l’usine principale ou
locale pour toute question ou problème concernant
ce matériel.
• Children and elderly, infirmed, or physically
handicapped persons are more likely to be injured
by hot water. Never leave them unattended in a
bathtub or shower. Never allow small children to
use a hot water tap or draw their own bath. If
anyone using hot water in the building fits this
description, or if state/province laws or local codes
require certain water temperature at hot water taps,
take special precautions:
Install an anti-scald valve at water heater or at each
hot water faucet, bath, and shower outlet.
Use lowest practical temperature setting.
• Studies have indicated that dangerous bacteria can
form in potable water distribution system if certain
minimum water temperatures are not maintained.
Contact local health department for more
information.
SECTION 2.
Installation
This installation must conform with the instructions
in this manual and, where applicable:
National Fuel Gas Code (ANSI Z223.1).
National Electric Code (NEC-NFPA 70).
Local, state, provincial, and national codes, laws,
regulations and ordinances.
In Canada - Natural Gas and Propane Installation
Code, CSA B149.1 and the Canadian Electric Code
(CEC - Can/CSA C22.1.
Where the recommendations made in this manual
differ from local or national codes, the local or national
codes take precedence.
1.1 Hazards and Your Safety
- Hot Water Can Scald!
The Consumer Product Safety Commission (CPSC)
and some states/provinces recommend a temperature
setting of 130°F (54°C) or less. The water heater
thermostat is factory set to approximately 120°F (49°C).
If thermostat will be set above factory setting, install an
anti-scald valve at either the water heater or at each hot
water faucet.
• Tempering valves are not anti-scald valves since
they do not have a positive shutoff in case cold
water supply fails. They are not recommended for
shower/tub service. If needed, install an anti-scald
valve at each shower/tub.
• Water heated to a temperature suitable for clothes
washing, dish washing and other sanitizing needs
can scald and cause permanent injury.
2.1 Location
This water heater/boiler unit is not intended for
outdoor installation. Select a convenient location where
water leakage from the tank or connections will not result
in damage to areas adjacent to the appliance or to lower
floors of the structure. When a safe location cannot be
found, install a suitable drain pan under the appliance,
and pipe it to an adequate drain.
2.2 Heater Placement
The heater must be placed to provide clearances on
all sides for maintenance and inspection. Allow 4 inches
(102mm) on each side for piping access. There must also
be minimum distances maintained from combustible
surfaces. Figure 2 shows minimum clearance from
combustible surfaces. The Mini-Combo unit can be
installed in a closet, as long as the minimum clearances
are maintained. Special attention should be paid to the air
supply opening to the closet. Refer to Table 1.
Page 4
B
C
Vent Damper*
Mini-Therm
Boiler
(50-125)
FRONT VIEW SIDE VIEW
54
1372
Tank
Aquastat
Drain
Valve
28
711
Tank
Relief Valve
178
A
24
610
7
Boiler Approx.
CL
Mounted
Pump
24
610
178
Domestic
MC A B C In/Out Gas Inlet/Outlet Weight
Size
inches mm inches mm inches mm
NPT NPT NPT
50 58¾ 1492 12½ 318 4 102 1¼ ½ ¾ 258 117
75 58¾ 1492 12½ 318 5 127 1¼ ½ ¾ 274 124
7
System
Check Valve
Check Valve
Outlet
Inlet
610
lbs. kgs
LAARS Heating Systems
1
24
/
622
(Sizes 50 & 25)
25 635
(Size 75 &
100)
Hot
Water
Tank
31
787
24
Minimum clearances from
combustible surfaces:
left side 2 51
right side 0 0
rear 6 152
front 4 102
top 23 584
100 59¾ 1518 14¼ 362 5 127 1¼ ½ ¾ 280 127
Service clearances:
allow 4 102 on each side
125 59¾ 1518 14¼ 362 6 152 1¼ ½ ¾ 286 130
for piping access.
*Vent damper is optional on some Canadian units.
2
Dimensions shown
in inches mm.
in. mm
Figure 1. Dimensional Information.
2
51
24
610
28
711
4 102
23 584
Space Heating -
Refer to Document 1025
6 152
Hot
Water
Supply
Cold
Water
Supply
Figure 3. Piping Schematic.
Dimensions
shown in inches
mm.
Top Clearance
Figure 2. Closet Installation.
Figure 4. Typical Expansion Tank Installation.
Mini-Combo II
Page 5
Net Free Area - square inches sq. mm
Model Inside Air Outside Air
MC50 100 645 15 97
MC75 100 645 20 129
MC100 100 645 25 161
MC125 125 807 32 207
Area indicated is for one of two openings: One at floor level and
one at the ceiling, so the total free area would be double the figures
indicated. Refer to Document 1025 for more information
Table 1. Minimum Recommended Air Supply.
2.3 Piping
• To Prevent damage to the unit, all soldering is to be
done prior to assembling the cold and hot water,
and any other connections to the tank.
• Use suitable pipe dope or tape.
• Before piping the boiler to the heating system,
be sure to install the system check valve (provided
with the unit) onto the inlet (return)
tee of the boiler with arrow pointed downward (see
Figure 3).
• If anti-freeze is used in boiler system, local codes
may require a backflow preventer on cold supply
line. Use anti-freeze specifically intended for
hydronic heating system. Inhibited propylene
glycol is recommended.
WARNING
Do not use automotive or ethylene glycol anti-freeze,
or any undiluted anti-freeze. This can cause severe
personal injury, death or substantial property damage.
AVERTISSEMENT
N’utilisez pas d’antigel de moteur ou à base d’éthylène
glycol ou toute sorte d’antigel dilué. Il peut en résulter
des blessures personnelles, la mort ou des dégâts
matériels substantiels.
If a backflow preventer, pressure reducing valve or
check valve is in cold water supply, install an expansion
tank on cold water supply line (Figure 4) to prevent
normal thermal expansion from repeatedly forcing open
the Temperature and Pressure (T&P) relief valve.
T&P relief valves discharge piping must be directed
so that hot water flows away from all persons. Attach
run-off tube to T&P valve and run tube within 6"
(152mm) from floor. No reducing couplings, valves, or
any other type of restriction is to be installed in this line.
This run-off tube must be installed to allow free and
complete drainage of both valve and run-off tube.
Filling Storage Water Tank
1. Open hot water faucet in house to allow air in the
tank and in piping to escape.
2. Open shut-off valve(s) in cold water supply line.
3. Open shut-off valve(s) in hot water supply line.
4. When water discharges from the faucet, close it.
Check for system leaks and repair if necessary.
Filling and connecting boiler pipes:
Consult the JV boiler manual, Document 1025.
CAUTION
Never use water heater/boiler unless it is completely
filled with water.
ATTENTION
N’utilisez jamais le chauffe-eau/chaudière s’il n’est pas
complètement rempli d’eau.
2.4 Wiring
Priority System: Under this wiring the storage tank
will be supplied before space heating. This will insure
that it gets adequate hot water flow from the boiler to
maintain a fully rated delivery of domestic hot water.
CAUTION
In this priority mode, any demand for space heating is
postponed until the storage water tank has reached
set temperature. This delay in supplying the space
heating zones is usually not noticed by the inhabitants
of the living spaces. However, in the event of certain
storage water tank malfunctions, space heating could
be delayed indefinitely. If undetected and uncorrected,
freezing damage to piping could result.
ATTENTION
Dans ce mode de priorité, toute demande de
chauffage est retardée jusqu’à ce que le reservoir à
eau ait atteint la température pré-réglée. Ce retard
n’est normalement pas ressentie pas les habitants des
zones habitables. Cependant, dans le cas d’un
mauvais fonctionnement du réservoir d’eau, le
chauffage pourrait être retardé indéfiniment. Si ce
problème n’est pas détecté et corrigé, la tuyauterie
pourrait geler.
WARNING
Electrical shock can cause severe personal injury or
death. Disconnect power supply to the boiler before
doing any electrical work.
AVERTISSEMENT
Les chocs électriques peuvent causer des blessures
corporelles graves voire la mort. Débranchez la
chaudière avant de commencer les travaux
d’électricité.
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