Submittal

System Reference: Date:
AVAILABLE MODELS
MAC-640BH-U
MAC-642BH-U1
PAC-645BH-E
PAC-646BH-E
PAC-SJ20BH-E
GENERAL FEATURES
• Prevents ice from building up on the outdoor unit base
when operating in heating mode for an extended period
of time in a very low temperature, high humidity
condition
• Controlled by outdoor unit
• Works during defrost operation and energizes when
outdoor temperature drops below 36ºF
• MAC-640BH-U connects to CN722 on control board of
MUZ-FH06,09,12NA, MUZ-GL09,12,15NA, MUZ-
HM09,12,15,18NA, MUZ-WR09,12,18NA, SUZ-
KA09,12,15NA2
• PAC-645BE-E connects to CN-714 on
MXZ-3C24/3C30/4C36/5C42NA
• MAC-642BH-U1 connects to CN601 on control board of
MUZ-FH15,18NA, MUZ-GL18,24NA, MUZ-HM24NA,
MUZ-WR24NA, SUZ-KA18,24,30,36NA2
• PAC-646BH-E connect to CN714 on MXZ-2C20NA2
• PAC-SJ20BH-E connects SS on Control board of
MXZ-8C48NA, 8C60NA, PUZ-A36,42NKA7, PUZ-
HA42NKA, PUMY-P36,48,60NKMU2
INSTALLATION NOTES
• For MUZ-A models, the power board needs to be
replaced with board included with pan heater
• Use of drain pan heaters is recommended when ambient
temperatures are expected to be below freezing for
periods longer than 72 hours straight; or when
continuous sub-zero outdoor ambient conditions are
expected to last longer than 24 hours
• Outdoor unit must not be installed directly on the ground,
but on a raised platform, such as on mini-split stands, to
suppress freezing
• Recommended installation of a Ground Fault Interrupt
(GFI) circuit breaker, depending on installation area to
prevent electric shock
• See corresponding installation instructions, and outdoor
unit technical service manual for further details on
installation
DRAIN PAN HEATERS
LOW AMBIENT BASE P
AN HEATERS
Specifications are subject to change without notice. © 2019 Mitsubishi Electric Trane HVAC US LLC