Operating instructions

II. SPECIFICATIONS
Table 1: Specifications
I. PRODUCT DESCRIPTION
The Crown MT series indirect water heater is designed to generate domestic hot water in conjunction with a hot
water boiler using forced boiler water circulation. This indirect water heater consists of an enameled steel tank in
which a smooth coil is located. Boiler water is pumped through the coil and heats the water in the tank. The
Maxi-Therm is not intended for use in heating any fluid other than water. It is also not intended for use in gravity
hot water heating systems.
IMPORTANT NOTE
Some localities require indirect water heaters having a relief valve capacity in excess of 200,000 BTU/hr to be
constructed and stamped in accordance with ASME requirements. Check with the local authority having
jurisdiction before installing an MT079G or MT100G with a boiler having a total gross output in excess of
200,000 BTU/hr.
2
MT040G MT050G MT079G MT100G
FIRST HOUR RATING (Gal/hr)* 192 225 286 400
BOILER OUTPUT (BTU/hr) 103,149 116,094 137,604 200,038
BOILER WATER FLOW (Gal/min) 8.0 8.0 10.0 10.0
COIL HEAD LOSS (ft w.c.) 2.6 2.6 4.4 5.7
COIL SURFACE (sq. ft) 12.1 14.3 15.1 25.8
TANK VOLUME (Gal) 38.0 49.7 79.3 101.7
NET WEIGHT (lbs) 190 226 245 310
FILLED WEIGHT (lbs) 523 658 926 1187
A 5 1/8 5 1/8 2 3/4 2 3/4
B 9 3/4 9 3/4 10 10
C 34 37 7/8 28 1/2 43 3/8
D
-
- 36 1/2 48 3/8
E 50 1/2
62 3/4 52 5/8 65 7/8
COLD/DRAIN 3/4 M 3/4 M 1 M 1 1/4 M
BOILER SUPPLY 1 F 1 F 1 F 1 F
BOILER RETURN1 F1 F1 F1 F
HOT 3/4 M 3/4 M 1 M 1 1/4 M
THERMOSTAT 3/4 F 3/4 F 3/4 F 3/4 F
RECIRC. - - 3/4 F 3/4 F
T & P VALVE 3/4 F 3/4 F 1 F 1 F
CONNECTIONS (NPT)
DIMENSIONS (in)
* First Hour Ratings are based on 58F inlet water, 135F hot water, 180F boiler supply water
MAXI-THERM