MrHeater MH40 NG User manual

INSTALLATION AND OPERATING INSTRUCTIONS
WARNING
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE
OR MAINTENANCE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.
READ THE INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS
THOROUGHLY BEFORE INSTALLING OR SERVICING THIS EQUIPMENT.
ANSI Z83.6b - 1993 [AGA]
CAN 1-2. 16-M81 [CGA]
Stock #18682 9/97

1. WARNINGS
MAINTAIN CLEARANCES AS SHOWN IN TABLE 3 OR ON HEATER NAMEPLATE IN
GARAGE INSTALLATIONS WHERE PARKED VEHICLES ARE DIRECTLY BELOW THE HEATER.
DO NOT USE MATCH OR OTHER FLAME FOR LEAK TESTING.
DO NOT USE PLASTIC OR COPPER PIPE.
DO NOT EXCEED 1/2 P.S.I. INLET PRESSURE TO HEATERS SHOWN IN TABLE 1.
IF NOT INSTALLED, OPERATED AND MAINTAINED IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS, THIS PRODUCT COULD EXPOSE
YOU TO SUBSTANCES IN FUEL OR FROM FUEL COMBUSTION WHICH ARE
KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM.

TABLE OF CONTENTS
1. WARNINGS..
2. GENERAL INFORMATION.i
3. CLEARANCES.2
4. SUSPENSION.2
5. GAS SUPPLY.2
6 . PIPING REQUIREMENTS. 3
FIGURE 1 • PIPE COMPOUND APPLICATION. 3
FIGURE 2 - GAS VALVE CONNECTION REQUIREMENTS.3
FIGURE 3 - TYPICAL PIPING INSTALLATION.4
7. GAS PRESSURE.4
8 . ELECTRICAL..
9. THERMOSTAT & LOCATION. 4.5
FIGURE 4 - CONNECTION DIAGRAM. 5
10 VENTILATION. 5
11. START-UP PROCEDURE..
FIGURE 5 - THERMOSTAT CONTROLS . 5
FIGURE 6 - GAS VALVE COMPONENTS. 6
12. HEATER SHUTDOWN. 6
13. OPERATOR MAINTENANCE INSTRUCTIONS.6-7
1. TROUBLESHOOTING..
2. ADJUSTING THE PILOT FLAME .. 7
FIGURE 7 - PROPER FLAME ADJUSTMENT. 7
FIGURE 8 - TOP VIEW OF STANDARD CAPACITY GAS CONTROL.7
TABLE 4 ■ TROUBLESHOOTING CHART. 8
3. REPLACING THE GAS VALVE UNIT. 9
14 FREQUENCY OF OPERATOR CHECKS. 9
15 WARRANTY. ..
16. IF SERVICE IS REQUIRED. 9
17. MH40 REPLACEMENT PARTS LIST.. .
18. FIGURES 9-12--RECOMMENDED SUSPENSIONS. 1 1

2. GENERAL INFORMATION
a. Your heater comes fully assembled and is tested at the factory for proper gas and input as stated
on the name plate.
b. Before proceeding with the installation, be sure to inspect for damages. Freight company must be
notified of any damages and request that the inspection be made. MR. HEATER will send replace¬
ment parts for damaged parts only after receiving a signed inspection report to prove the liability of
the freight company.
c. Do not attempt to operate heater with any other gas than that indicated on the heater name plate.
d. The installation of heater must conform with local building codes, or in absence of local codes,
with the National Fuel Gas Code. ANSI Z223.1a/NFPA54, and Standard for Storage and Handling of
Liquified Petroleum Gases, ANSI/NFPA 58.
e. P lugged 1/8" N.P.T. Test Gage Connection is located on the Heater Gas Valve or a 1/4" N.P.T.
Connection is located on the outside of the Cast Venturi.
Table 1. BTU Ratings and Supply Pressures
MODEL
NO.
BTU/HR. RATING
GAS SUP
PLY PRESSUF
ORIFICE
SIZE GAS MIN. MAX. MANIFOLD
NATURAL PROPANE
NAT.
MEM : NAT
aia
NAT I
tsm
NAT.
tsm
MH40NG
MH40LP
40.000
40,000
6.8“
11"
m B
10"
37
50
Table 2. Heater Dimensions and Orifice Sizes
MODEL 1 OPERATING ORIFICE SIZE INPUT SIZE
NO. PRESSURE
PILOT BTU/HR WDTH LENGTH
HEIGHT WEIGHT
MH40NG 6.8" w.c.
37
.023
40,000 19-1/4" 30-1/4" 12" 25 LBS.
MH40LP 10 " w.c. 50 .015
40,000 19-1/4" 30 1/4" 12" 25 LBS
* For additional information, contact:
MR. HEATER CORPORATION
CUSTOMER SERVICE DEPT.
CLEVELAND, OHIO
1-800-251-0001
* The following extra NFPA manuals are helpful when installing MR. HEATER in a
location not anticipated in this manual:
Mumter Rf
lEiiai
Subj ect
NFPA 88 Clearances to Combustible Surfaces
NFPA 409 Clearances to Combustible Surfaces
- 1 -

DO NOT EXCEED 1/2 PSI INLET PRESSURE TO HEATER.
3. C LEARANCES Minimum clearances to combustibles (Refer to Table 3). Provide adequate
clearance to combustibles, see Table 3. Also, between control end of heater for servicing and
minimum on top and sides for ventilation and combustion air supply.
A minimum clearance of 8' above floor for public garages in accordance with ANSI/NFPA No. 88
most recent edition, or Table 3; whichever is larger.
A minimum clearance of 10' from the bottom of heater to top of wing, or engine enclosure, where
aircraft are housed, and 8' above floor in other areas of the hangar in accordance with ANSI/NFPA
No. 409 most recent edition, or Table 3; the larger dimension of ANSI/NFPA No. 409 or Table 3 is to
be used.
TABLE 3. INSTALLATION, VENTILATION AND MOUNTING INFORMATION
MODEL
NO.
BTU/HR. RATING
GAS
NORMAL
MOUNTING
POSITION
CLEARANCES TO COMBUSTIBLE S
LIRFACES
NATURAL PROPANE
TOP SIDES
BACK BELOW
MH40NG
MH40LP
40,000
40,000
HORIZ-30 0
HORIZ-30 0 mm
30"
30"
30"
30"
68"
68"
* When selecting installation locations for MR. HEATER ensure that the opening of any exterior or
interior doors or windows will not violate clearances or contact any heater components.
4. SUSPENSION
Heater has four mounting holes, two on each end, for attaching rod, chain, or angle iron brackets and
shall be safely and adequately fixed in position independent of gas and electric supply lines. Refer to
Figures 11
& 12 for recommended suspensions.
5. GAS SUPPLY
Provide adequate gas supply for rated input of each heater using American Standard Installation of
gas piping and gas appliances in building. ANSI Z223.1a/NFPA 54 pamphlet, Table C-3 shows
capacity of pipe of different diameters and lengths in cubic feet per hour for natural gas with pressure
drop of 0.3 inches, specific gravity of 0.60. For liquified Petroleum Gas (LP) capacity refer to Table
C-3 and C-15 of the same pamphlet. For recommended heater gas connection refer to Figures 3 &
10. On threaded pipes use a pipe compound which is resistant to the action of all gases.
If gas lines are to be pressure tested with compressed air, disccnnect each heater to prevent control
damage and cap outlets. After reconnecting all heaters, purge gas lines of air and check all connec¬
tions for leaks using soap solution. Liquid dishwashing detergent is an excellent leak detector.
- 2 -

6. PIPING REQUIREMENTS
All piping installed must comply with local codes and ordinances or with the National Fuel Gas Code,
ANSI Z223.1 (NFPA54), whichever takes precedence. When installing piping, the following require¬
ments must be taken into consideration:
* Use new properly reamed black pipe free from chips.
* Apply a good quality pipe compound to all male threads prior to
assembly. If L.P. gas is the fuel, ensure that pipe compound is
resistant to L.P. gas. PQ NQT USE TEFLQN (tm) tap?-
* Prior to installation, apply pipe compound to all male threads
as shown in Figure 1.
USE MODERATE AMOUNT OF PIPE DOPE
LEAVE 2 THREADS BARE
Figure 1. Pipe Compound Application
* Male threads on pipe to be installed into gas valve shall meet the requirements of Figure 2.
Threads longer than those shown in the figure may cause gas valve distortion and malfunction.
* A sediment trap meeting the typical requirements of Figure 10 shall be installed in the line to
the gas valve.
* A dedicated shutoff valve for the heater must be installed in the gas supply line.
3/4“ MAXIMUM
THREAD LENGTH
1/2" BLACK PIPE
1 1
(11
GAS VALVE BODY
-
1/2" MAXIMUM
DEPTH OF INSERTS-
■ *
INTO GAS VALVE
FIGURE 2. GAS VALVE CONNECTION REQUIREMENTS
-3-

NOTE:
1. ONLY USE A PIPE COMPOUND
WHICH IS RESISTANT TO
LIQUIFIED GASES ON L.P.
INSTALLATIONS.
2. FITTINGS SHOWN ARE NOT
INCLUDED WITH HEATER.
FIGURE 3. TYPICAL PIPING INSTALLATION
7. GAS PRESSURE
When a higher than the maximum recommended gas pressure is being maintained at the main gas
line, a separate regulator must be installed ahead of the heater Refer to Table 1 for maximum allow¬
able pressure for stated heater model and gas.
See heater rating plate for minimum gas supply pressure Tor the Purpose of Input Adjustment."
On a multiple heater installation it may be possible to use one large capacity regulator or an individual
regulator for each heater. Nevertheless, it is recommended practice to make the entire pipe system a
loop.
Contact your local representative or the factory for proper gas pressure reducing design stage.
8. ELECTRICAL
NEVER CONNECT POWERPILE GAS VALVE OR THERMOSTAT TO LINE VOLTAGE OR A
TRANSFORMER.
9. THERMOSTAT & LOCATION
Make sure that the electrical characteristics of the thermostat match those of the heater controls. For
best results thermostat should be positioned 5 ft. above floor where air can circulate freely around it.
DO NOT MOUNT directly to cold-side wall, in direct drafts, or directly beneath the infra-red
heater.
Ensure that the selected thermostat location meets all of the above requirements. Refer to the in¬
structions that come with the thermostat for additional general information and mounting instructions.
If the wall is of stud and wallboard construction, then use the #6 by 1 inch sheet metal screws, in¬
cluded with the thermostat, and mount the thermostat in the selected location.
- 4 -

If wall is brick or masonry, the appropriate anchors must be obtained to accommodate the thermostat mount¬
ing screws. Use the back plate of the thermostat as a template to mark the hole location, drill appropriate size
anchor holes, install the anchors and securely attach the thermostat using the mounting screws.
Connect thermostat wires to gas valve as shown in Figure 4.
THERMOSTAT
Ih
I 1
1—1
CHIRM >0 U6UXJ*
/
(MCI fUBTU
' .
y ^
: ~
— *- -w
u+i
< •
< i
s*tr
* *fi"
•«*»• ”
ip*. • >ec
CWCCHI* DUWw
°P SYSTEM
FIGURE 4 CONNECTION DIAGRAM
10. VENTILATION
a. The minimum intake and exhaust air openings shall provide ‘or not less than 400 CFM for every
100,000 BTU input expect that the infiltration area may be included in the intake area.
b. Where natural (gravity) ventilation is provided for exhaust, the openings must be distributed above
the heaters (preferably at the peak of the roof) and the areas of openings shall not be less than
300 square inches for every 100,000 BTU input.
11. START-UP PROCEDURE
OPEN THE GAS SUPPLY VALVE OR VALVES.
Ihemostot-v
\ I
N;
FIGURE 5. THERMOSTAT CONTROLS
Set the thermostat to the OFF position. See Figure 5. If the manual gas control knob on the gas valve
is not in the OFF position, partially depress the knob and rotate to the OFF position. See Figure 6.
-5-
50 60 K 80 90 ;
t 'iti * V T

FIGURE 6. GAS VALVE COMPONENTS
Wait 5 minutes to allow gas that may have accumulated in the mam burner to escape (especially
important after installation).
Turn the manual gas control knob to the PILOT position.
Depress the manual gas control knob. Using a match, light the pilot light. See Figure 6. Hold the knob
down for approximately 30 seconds to allow any air in gas lines to pass through pilot and, once the pilot
is lit, allow the thermocouple to heat up enough to activate the safety valve in an open position.
Release manual gas control knob and turn to ON. Reset thermostat to desired temperature.
NOTE
During the initial startup of MR. HEATER an odor and, perhaps, some vapor will come from the
heater. This is the gasket binding material emitting this odor and/or vapor. After approximately 20
minutes this odor will disappear and not occur again.
12. MR. HEATER SHUTDOWN
Turn thermostat to OFF.
Turn manual gas control knob on gas valve to PILOT position.
Partially depress knob and rotate to the OFF position.
Close gas supply valves.
13. OPERATOR MAINTENANCE INSTRUCTIONS
1. TROUBLESHOOTING
a. Table 4 lists the common malfunctions which you may fir d during the operation or mainte
nance of your heater.
b. For additional information refer to Honeywell Field Bullet n enclosed in the heater carton.
c. In the event results cannot be obtained after performing all listed solutions, call your Mr.
Heater dealer, or the factory customer service department at 1 -800-251 -0001.
- 6 -

2. ADJUSTING THE PILOT FLAME
The pilot flame should envelope 3/8 to 1/2 in. (10 to 13 nm) of the tip of the thermocouple or
generator. To adjust the pilot flame, refer to Figure 7.
FIGURE 7. PROPER FLAME ADJUSTMENT
a. Remove pilot adjustment cover screw. Refer to Figure 8.
b. Turn inner adjustment screw clockwise-* to decrease or counterclockwise 4-to increase pilot
flame.
c. Always replace cover screw after adjustment and tighten firmly to ensure proper operation.
MANUAL GAS
CONTROL KNOB
PRESSURE REGULATOR ADJUSTMENT
(BENEATH COVER SCREW)
INSTALL LONG
SCREW IN
OUTSIDE CORNER
STANDARD
PRESSURE
REGULA“OR
("A- MODEL)
PILOTSTAT
POWER UNIT
PILOT FLOW ADJUSTING SCREW
(BENEATH COVER SCREW)
STEP OPENING
REGULATOR
rC" MODEL)
P1LCT GAS OUTLET
(PRESSURE TAPPING
DIRECTLY BENEATH)
FIGURE 8. TOP VIEW OF STANDARD CAPACITY GAS CONTROL
- 7 -

TABLE 4 TROUBLESHOOTING CHART
Below in chart form are various symptoms of a malfunctioning system, possible defects that will
cause these symptoms and suggested corrective measure. The chart assumes that the proper gas
pressure is available to the heater and that the lighting procedure is as stated on the plate attached to
the heater.
SYMPTOMS CAUSES SOLUTIONS
Burner light off very slow Partially blocked pilot orifice
Pilot out of adjustment
Re-adjust pilot
Replace
Burner light off very slow infra-red
Color stays dull
Partially blocked burner orifice
Replace
Burner flashback
(roaring noise during operation
and ceramic grid surface
will be dark)
Low gas pressure
Damaged burner
Correct line pressure or call
your gas supplier
Replace
Ceramic grid or burner sooting
up (when new or after cleaning)
First check for damaged
burner orifice
Replace if damaged
If burner orifice is not damaged
then check for damaged manifold. Replace
Pilot cannot be ignited Blocked pilot orifice
Gas cock not in position
Pilot gas flow adjustment
Screw may be closed
Replace
Gas cock knob must be turned
to pilot and held depressed
Open and adjust (see Figure 12)
Pilot lights but goes out Defective thermocouple
Defective control
Replace
Replace
Pilot stays lit but main burner
will not light
Loose wire or improperly wired
Defective control
Tighten connections, check
wiring diagram
Replace
Blocked burner orifice Clean orifice or replace
Failure to ignite Main gas off
Air in gas line
Loose wire connections
Open manual valves
Bleed gas line
Tighten wire connections
Dirty wire connections
Clean terminals and secure
terminals

3. REPLACING THE GAS VALVE UNIT
a. Remove the two gas valve unit wires at the gas control valve labeled “PR.”
b. Unscrew gas valve from gas piping.
c. Reconnect gas valve and unit wires to terminals “PP. ’ Be sure to leave thermostat wire on
one terminal.
14. FREQUENCY OF OPERATOR CHECKS
Intermittent Use - Appliances that are used seasonally should be checked before shutdown
and again before the next use.
Dusty, wet or corrosive environment. Since these environments can cause the gas control
to deteriorate more rapidly, the system should be checked more often.
The gas control should be replaced if:
a. It does not perform properly on checkout or troubleshooting.
b. The gas control knob is hard to turn or push down, or it fails to pop back up when released.
15. WARRANTY
MR. HEATER warrants that infra-red heaters manufactured and sold will be free from defects
in material and workmanship.
MR. HEATER pro-rated grid warranty shall continue in e*ffect until the expiration of five (5)
years from the date of shipment of original grid by MR. HEATER.
Parts, assemblies, controls, etc. furnished by Mr. Heater suppliers will carry a one year (1)
warranty or the applicable warranties of the suppliers.
The sole responsibility of Mr. Heater under this warranty shall be to replace or repair any part
for which a written claim is made to Mr. Heater within the time limit of this warranty, which is re¬
turned upon request to Mr. Heater - F.O.B. Cleveland, Ohio - or F.O.B. a Mr. Heater authorized
service facilty and which is proved to be defective upon insoection by Mr. Heater.
This warranty shall not apply to any part or product which has been subjected to misuse or
neglect, damaged by accident, or rendered defective by reason of improper installation. THIS
WARRANTY IS IN LIEU OF ANY AND ALL OTHER WARRANTIES. EXPRESSED OR IMPLIED,
and in any other responsibility of Mr. Heater for parts or products sold by Mr. Heater, including
consequential or special damages. _
16. I F SERVICE IS REQUIRED
PLEASE DO NOT RETURN THIS APPL ANCE TO YOUR STORE.
For information regarding service, please call our loll-free number: 1-800-251-0001
Our office hours are 8:30 AM - 5:00 PM, Eastern Time Zone, Monday thru Friday.
Please include the model number, date of purchase, and description of
problem in all communication. _

CM
CO
17. MH40 REPLACEMENT PARTS LIST
ITEM NO
STOCK NO DESCRIPTION ITEM NO. S“OCK NO. DESCRIPTION
1
00024
GAS-VALVE-NATURAL GAS
9 09360 THERMOCOUPLE-GENERATOR
2 00025
GAS VALVE-PROPANE GAS
10
THERMOSTAT
3 00434A REFLECTOR ASSY. 11 PILOT BURNER N.G.
4 02523A BURNER ASSY. 12
17374 CHAIN KIT
5 05574 ORIFICE - PILOT NAT. GAS 13 F114561 HEATER HANGER KIT
6 05573
ORIFICE - PILOT PROPANE GAS 14
11405
PILOT BURNER L/P
7 05450
ORIFICE BURNER-PROPANE GAS
8 05437
ORIFICE - BURNER NAT. GAS