HTP EL-399NVWH - Manual (Page 69)

69
LP- 346 REV. 3.20.14
PART 12 – MAINTENANCE
A. MAINTENANCE PROCEDURES
Periodic maintenance should be performed once a year by a qualified service technician to assure that all the equipment is operating
safely and efficiently. The owner should make necessary arrangements with a qualified heating contractor for periodic maintenance of
the heater. The installer must also inform the owner that a lack of proper care and maintenance of the heater may result in a hazardous
condition.
BEFORE EACH HEATING SEASON a trained and qualified service technician should perform the inspections as per the heater
inspection and maintenance schedule in the back of the manual. Failure to do so could result in death or serious injury.
The combustion chamber insulation in this product contains ceramic fiber material. Ceramic fibers can be converted to
cristobalite in very high temperature applications. The International Agency for Research on Cancer (IARC) has concluded,
“Crystalline silica inhaled in the form of quartz or cristobalite from occupational sources is carcinogenic to humans (Group
1).”

Avoid breathing dust and contact with skin and eyes.

Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for cristobalite
at the time this document was written. Other types of respirators may be needed depending on job site conditions.
Current NIOSH recommendations can be found on the NIOSH website: http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and phone numbers are also listed on this website.

Wear long-sleeved, loose fitting clothing, gloves, and eye protection.

Apply enough water to the combustion chamber lining to prevent dust.

Wash potentially contaminated clothes separately from other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.

Eye: Irrigate immediately.

Breathing: Fresh air.
Outdoor Sensor (7250P-319)
Supply Temperature Sensor (7250P-324)
Heater Sensor (7250P-667) Indirect Sensor (7250P-325)
Outside Temperature (
o
F) Resistance (ohms) Outside Temperature (
o
F) Resistance (ohms)
-22 171800 32 32550
-13 129800 41 25340
-4 98930 50 19870
5 76020 59 15700
14 58880 68 12490
23 45950 77 10000
32 36130 86 8059
41 28600 95 6535
50 22800 104 5330
59 18300 113 4372
68 14770 122 3605
77 12000 131 2989
86 9804 140 2490
95 8054 149 2084
104 6652 158 1753
113 5522 167 1481
176 1256
185 1070
194 915
203 786
212 667
Table 29 – Sensor Resistance Tables